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shindengen electric mfg.co.,ltd - 1 - confidential MCZ5205SE application note jan .201 1 ver1.0
shindengen electric mfg.co.,ltd - 2 - confidential disclaimers thank you for purchasing our products . this manual contains important information on the safe use of our products . your safety is of the utmost importance to us. please read these instructions carefully before using our products . the following symbols mean: ! warning improper use of the products can result in dea th, serious injury, or expensive damage to equipment. ! caution improper use of the products can result in minor injuries or damage to equipment. ! ! warning warning although we are constantly making every effort to improve the quality and reliability of our products, there nevertheless remains a certain probability that the semiconductor products may occasionally fail or malfunction. please take careful preca utions against product failures or malfunctions to avoid any injuries, fire accidents or social loss by implementing safety designs such as redundancy designs, designs for fire spread prevention, and designs for preventing malfunctions. our semiconductor products listed in this document are not designed or manufactured to be used in device s or systems requiring extremely high levels of quality and reliability, or the failure or malfunction of which may directly threaten human lives or cause injury. i n the cases where the products are to be used in device s or systems for special applications or devices or systems for specialized applications shown below, always make sure to consult us in advance. special applications transportation device s (automotive, marine, etc.), communication devices for core network , traffic signal devices, fire prevention/anticrime devices, various safety devices, medical devices, etc. specialized applications nuclear power control systems, aircraft and aerospace devices, submari ne relay devices, and systems for preserving life, etc. even if it is not for a special or specialized application, when ic products are to be used for devices or systems that are desired to last for a long period under continuous operation, please make sure to consult us in advance. ! ! ! ! ! cautio n cautio n cautio n cautio n cauti o n do not attempt under any conditions to repair or modify ic products by yourself. doing so could result in electric shock, device breakage, fire, and malfunction . when an abnormal condition occurs, an excessive voltage or under voltage may be generate d across the output terminals of the circuit. install preven ta tive measures (e.g. over - voltage protection, over - current protection) for the device by considering the possibility of a malfunction and/or breakage of a load in an abnormal condition. do not s witch on the circuit before confirming the proper connection and polarity of input and output terminals as an erroneous connection may cause breakage of the protection device or smoke/fire. do not use the circuit beyond the rated input voltage and instal l a protection device on the input rail to prevent smoke/fire that may be caused from an abnormal condition. if a breakdown or other abnormal condition occurs during the use of the device, immediately stop power to the device and consult us at your earl iest possible convenience. we reserve the right to make any changes to the contents of this manual without prior notice in accordance with modifications to ic products . details of specifications should be exchanged at the adoption of the ic products . all information include d in this manual is believed to be accurate and reliable. however, our company takes no responsibility for any injury or damage incurred when using the ic products as described in this manual. neither do we take any responsibility for issues arising from i nfringement of patent or other rights caused by using this manual. the provision of this manual do es not guarantee the right to use any third party? s patent or other rights , or grant permission to use the patent or other rights of our company. no part of this manual may be reproduced or copied without the specific written consent of shindengen electric mfg. co., ltd. we are happy to provide circuit design support for safe use of the ic. please consult our sales representative . mcz520 5se
shindengen electric mfg.co.,ltd - 3 - confidential index 1 : general description 1. 1: features 4 1. 2: internal block diagram 5 1. 3: pin assignment 6 1. 4: functions 6 1. 5: application circuits 7 2 : functional description 2 . 1: outline 8 2 . 2: power supply block 8 2 . 3: pfc block 9 - 12 2 . 4: llc bl ock 13 - 18 2 . 5: others 19 - 21 2 . 6: r emarks 21 3 : peripheral components setting 3 . 1: pfc zcs turn on timing (zc) 22 3 . 2: pfc phase compensation (comp) 23 3 . 3: pfc output voltage / ovp threshold (fbp) 23 3 . 4: pfc ocp setting (csp) 2 4 3 . 5: l lc brown out protection (vsen) 24 3 . 6: llc osci l lator / feedback (fbl) 25 3 . 7: llc soft start / protection delay timer (sst) 2 6 3 . 8: llc current limit ing / capacitive mode protection (csl) 26 3 . 9: pfc output voltage and llc brown out protection ( in case of common sensing line for fbp and vsen ) 27 4 : circuit diagram 4 . 1: typical application circuit (llc dual output) 2 8 5 : dimension 5 . 1: sop22 (MCZ5205SE) 2 9
shindengen electric mfg.co.,ltd - 4 - confidential 1 general description the MCZ5205SE adopts one chi p solution to provide crm pfc and llc controller/driver in small package. this robust combo - ic eliminates external components for protective function and its multi functional terminal configuration simplifies power supply designing by using minimal compone nts. active standby function provides improved efficiency at light load condition. crm pfc and symmetric llc combination provides excellent performance in low noise characteristics and also highly efficient power supply solution. the MCZ5205SE is most s uitable for: ? fpd psu (lcd / pdp / projection) ? oa equipment psu (lbp ? etc.) ? high power adapter ? high power industrial equipment ? high power led lighting driver 1.1 features 1. pfc and llc contro l lers are integrated in sop22 package. 2. a ctive standby function improves efficiency at light load condition. 3. pfc adopts ovp multi - detective function to simplify the circuit . 4. optimi z ed pfc/llc on - off timing. 5. vcc up to 35v with 12.6 / 8.5v uvlo. [ pfc ] 1. critical conduction mode pfc control l er. 2. peak curr ent limiting threshold of 0.5v. 3. no i n put line sensing is required. 4. various protections are installed . (feedback pin open/short, dynamic ovp, t hermal shutdown) [ llc ] 1. optimi z ed gate drive balance simplifies drive circuitry. 2. 600v floating gate driver s with individual uvlo. 3. active standby operation eliminates a weak point of symmetric llc that is unsatisfactory efficiency at light load condition. 4. anti - capacitive protection 5. various protections are installed . (peak current limit / ti mer delay ed latching / thermal shutdown)
shindengen electric mfg.co.,ltd - 5 - confidential 1.2 internal b lock diagram fig.1 MCZ5205SE internal b lock diagram
shindengen electric mfg.co.,ltd - 6 - confidential 1.3 pin assignment 1.4 functions pin no. symbol convert er f unction 1 zc pfc z ero c urrent detection to determine turn on timing 2 comp pfc o utput of pfc feedback amp for phase comp ensation and soft start 3 fbp pfc input of p fc f eed b ack amp 4 vsen llc line v oltage sen sing for brownout protection 5 vc1 commo n voltage source input for control circuit with 1 2.6 v/8. 5 v uvlo 6 fbl llc l lc operating frequency and duty setting f eed b ack terminal 7 sst llc s oft s tart and protection t imer 8 sgnd common s ignal gnd terminal 9 csl llc l lc resonant c urrent s ensing 10 as common terminal for a ctive s tand by mode / external latch signals input 11 vgl llc g ate drive output for l ow side mosfet 12 vgh llc g ate drive output for h igh side mosfet 13 vs llc floating high side gate driver reference voltage ( : connect with s ou rce terminal of high side mosfet) 14 vb llc floating vcc b ootstrapping input 15 - 18 nc - non connection 19 vc2 common output terminal of supply for pfc and llc driver 20 pgnd common p ower gnd 21 csp pfc p fc mosfet source c urrent s ensing 22 vgp pfc g a te drive output for p fc mosfet fig. 2 MCZ5205SE pin assignment
shindengen electric mfg.co.,ltd - 7 - confidential 1.5 application circuits fig. 3 basic circuit example fig. 4 basic circuit example (without pfc)
shindengen electric mfg.co.,ltd - 8 - confidential 2 functional description values described in this document such as threshold are typical, unless otherwise specified. for details, please refer to characteristic specification. 2.1 outline the functionality of the MCZ5205SE can be grouped as follows: 1) p ower supply for details , refer section 2.2 . 2) pfc controller for details , refer section 2.3 . 3) llc controller for details , refer section 2.4 . 4) others (active standby, common protection) for details , refer section 2.5 . 2.2 power supply block 2.2.1 power supply for controller (vc1) vc1 is power supply input terminal for controller . connect a capacitor between vc1 and gnd close to the terminals to supply stable voltage . s elec t the capacit ance value to stabilize transient conditions. (fo r example, s tart up and shut down.) i f malfunction of MCZ5205SE occurs due to n oise on vc1 , insert a mlcc of 1 to 4.7uf between vc1 and gnd close to the terminal. if vc1 voltage reache s vc1(start) 12.6v , vc2 start charging. if vc1 voltage falls below vc1 (stop) 8.5v , vc2 start s discharging and controller stops its operation . if the latch - stop works due to an abnormal state, it is necessary for restarting to release the latch by reducing vc1 voltage to less than latch reset voltage of vc1(latch reset) 8.1v . 2.2.2 power supply for gate driver (vc2) vc2 is output terminal of supply for pfc and llc driver . vc2 supplies stable voltage to gate drivers of pfc and llc controllers. connect a capacitor between vc2 and gnd close to the terminals to secure the stab le driving in general and also transient conditions such as start up and shut down. capacitance of 4.7 to 22uf is recommended . when vc2 voltage reache s vc2(start) 9.6v , oscillator (connected with fbl ) starts operation and driving is ready . refer to secti on 2.3 and 2.4 for the condition to start gate driving of pfc and llc controllers. 2.2.3 power supply for llc high - side gate driver ( vb ) vb is output terminal of supply for llc high - side driver . vb is connected with vc2 via the bootstrap diode . connect a capacitor between vb and vs . s elect a capacitor with considering stable driving in transient conditions such as start up and shut down. capacitance of 0.1 to 0.47uf is recommended . bootstrap diode requires fast and soft recovery characteristics . for exa mple, select a diode of 600v or higher when pfc output voltage is 400v. d1nk60 (shindengen) is recommended. vb is equipped with a n i ndependent uvlo (under voltage lock out) . if vb voltage reaches vb - vs(start) 7.4v , high - side gate driving starts. if vb vol tage falls below vb - vs(stop) 5.3v , high - side gate driving stops. this hysteresis provides stable driv ing at transient condition of start up and shut down.
shindengen electric mfg.co.,ltd - 9 - confidential 2.3 pfc block 2.3.1 pfc gate driver (vgp) vgp drives a gate of pfc, and th e voltage is supplied by stabilized voltage source vc2 ,10.2v. fig . 5 shows some example s of the drive circuit. in typical circuits shown in a) and b) , s elect the small type s chottky b arrier d iode , not hard recovery diodes . d1ns4 or m1fm3 ( shindengen ) is r ecommended. in case of us ing a mosfet with large qg, use pnp transistor as shown in fig . 5 c) . 2.3.2 pfc output voltage control and over - voltage protection pfc output voltage is stabilized b y controlling the on - duty of pfc gate driving . s hown in fig .6 , pfc output voltage is monitored by fbp , and is stabilized by feeding - back the f bp voltage by comparison with internal reference voltage vo(ref), 2.5v . comp controls charge and discharge so that fbp voltage becomes 2.5v, consequently pfc output voltage becomes stable. ( fbp voltage<2.5v -- > comp capacitor charges. and fbp voltage>2.5v -- > comp capacitor discharges.) pfc has an over - voltage protective function to protect components (e.g. capacit ors) from damage due to excessive voltage. if fbp voltage exceeds vfb(h) , that is vo(ref) 1.10 , the gate driving stops (not latch - stop) . connect a capacitor of around 1000pf between fbp and gnd close to the terminals for noise reduction. r 1 r 2 r 3 d 1 r 2 r 1 r 3 q 1 d 1 b ) a ) qa qb qa qb q 1 r 1 r 3 q 1 r 2 c ) qa qb vgp gnd gnd vgp vgp csp rcspdet rcspdet gnd rcspdet csp csp fig. 5 pfc gate drive circuit
shindengen electric mfg.co.,ltd - 10 - confidential 2.3.3 pfc phase compensation comp is feedback amplifier output terminal . phase compensation is adjusted by capacitor of 0.1 - 1.0uf connected between comp and gnd . fig . 7 shows an example of the comp phase c ompensation. for details of phase adjustment, r efer to section 3.2 . the relationship between vgp on - time and comp voltage is shown in fig . 8 . m aximum on - time is fixed as ton(max) 27.5u s . when comp voltage decreases to 0.8v or less, on - time becomes zero, consequently to prevent the increase of output voltage. 2.3.4 pfc critical c onduction mode pfc block adopt s critical conductio n mode. pfc mosfet turns on by detect ing the voltage across a control winding of main choke. gate on timing is determined by zc signal as shown in fig.9 . once v zc reaches zc comparator threshold voltage(h) v zc (h), 1.55v , and then decreases beyond zc co mparator threshold voltage(l) v zc (l), 0.55v , mosfet turns on by detecting the negative edge . t his hysteresis (:v zc (h) ? v zc (l)) provides the higher noise immunity . ton dead time of 800ns is adopted in order to prevent malfunction of mosfet caused by ringi ng voltage at the timing of gate - off. fig. 6 pfc gate drive circuit comp c comp 2 c comp 1 r comp fig. 7 example circuit connected with comp fig. 8 comp vs on time
shindengen electric mfg.co.,ltd - 11 - confidential i nsert a limiting resistor between control winging and zc . this resistance has following two roles. 1. turn on the gate at the lowest point of the dra in - source voltage of mosfet . 2. the resistor limits the current on zc to +/ - 5ma or less , that is maximum allowable current on zc . 2.3.5 pfc over current protection pfc over current protection is provided by monitoring the csp voltage determined by resisto rs . c onnected between source of pfc mosfet and gnd. mosfet turns off by detecting csp voltage exceeding the over - current threshold voltage as shown in fig.10 . to prevent malfunction of over - current protection caused by noise just after turn on , leading edge blank time (leb) is adopted. connect a capacitor of around 0.1uf close to csp to prevent malfunctions due to noise. adding a resistor r csp2 of around 10ohm is more effective for the prevention. for designing the circuit, refer to section 3.4 . fig. 9 pfc block timing diagram (zc) fig. 10 csp circuit example and timing diagram
shindengen electric mfg.co.,ltd - 12 - confidential 2.3.6 pfc fbp open/short protection if fbp voltage decreases to vfb(l) 0.4v or less, pfc stops operation. therefore, if fbp is shorted circuit to gnd , pfc safely stops operation. pfc also stops operation on condition of fbp open circuit, as fbp voltage to zero. 2.3.7 pfc low input voltage protection the MCZ5205SE does not directly monitor the input voltage . therefore, if fbp voltage exceeds 0.4v even in low input voltage cond ition, pfc continues the operation. however, MCZ5205SE has the limiting function for maximum on - time internally fixed as 27.5us . decreases output current to prevent the excessive stress on mosfet or other components. 2.3.8 pfc output over voltage protec tion ( light load) at light load condition , the output voltage is stabilizes by narrow ing the on - time width of gate driving . however, in the case where the output voltage increases even if the on - time width reaches the minimum set value , a function that th e oscillation stops where comp voltage decreases to v th ( burst ), 0.8v or less operates to prevent the over voltage of output.
shindengen electric mfg.co.,ltd - 13 - confidential 2.4 llc block 2.4.1 llc gate driver (vgl,vgh ) t he gate drivers have 0.18a sourcing and 0. 38 a sinking current capability at vc2=10 .2 v . typical example circuits are shown in fig. 11 a ) . when using a diode for discharging as shown in fig . 11 b) c) , small type sbd( s c hot t ky b arrier d iode). d1ns4 ( shindengen ) or m1fm3 (shindengen) are recommended. 2.4.2 llc oscillator (fbl) the timing of gate dr ive puls e vg l and vg h is determined by charging and discharging of a timing capacitor ct . ( the timing capacitor ct is connected with fbl .) g ate output s are on during the period of ct discharg ing . vg l and vg h are alternately output ted to drive mosfets. during the time period of ct charg ing , both vgl and vgh are simultaneously off, called as dead time (dt), to prevent simultaneously on of mosfets . the MCZ5205SE is the frequency and on duty modulation type . the frequency modulate s by fb current across a current limiting resist or and on - duty modulates according to the frequency as shown in fig . 1 3 . larger dead time in light load condition secures zvs (zero voltage switching ) over a wide frequency range. minimum frequency ( fmin ) is determined by the value of ct capacitor and rt resistor. fig. 1 1 llc gate drive circuits fig. 12 fbl timi ng diagram fbl dt dt dt dt vgh vgl ct fb rt pc 1 fbl
shindengen electric mfg.co.,ltd - 14 - confidential maximum frequency ( fmax ) is determined by the value of rt resist or and fb resistor . maximum frequency ( fmax ) of 300khz or less is recommended in continual operating condition . s oft start oscillation frequency ( fss ) var ies depending on the value of ct capacitance. ( for details, refer to characteristic diagram sheet. ) 2.4.3 vsen brown - out protection (vsen) vsen monitors the pfc output voltage for halting gate drive pulse, varying the frequency. uvlo function avoids below - resonant state caused by vbulk supply brown - out (quick decrease of input voltage) or black - out (in stantaneous interruption). timing diagram of vsen brown - out protection is shown in fig.1 4 . vsen threshold voltage varies depending on as mode on or as mode off. ( s ee section 2.5 . 1 ) (1) as mode off : vsen1(ss - reset) 3.55v / vsen2(ss - reset) 3.25v (2) as mode on : vsen3(ss - reset) 1.00v / vsen4(ss - reset) 0.90v h ysteresis characteristics of vse n prevent s malfunction of vsen due to the pfc output voltage ripple . [power on] (a) vsen voltage exceeds to 3.55v (as mode off), sst capacitor starts charging . (b) sst voltage exceeds to 0.6v , llc gate output is start s . sst is the soft start operat ed by gradual chargi ng of sst capacitor . ( for details of ss t, refer to section 2.4.4 . ) [power off] (a) vsen voltage decreases to 3.25v (as mode off), sst capacitor starts discharging . frequency gradually increases . (b) sst voltage decreases to 0.5v , llc gate output stop s . fr e qu e n c y vs du ty 30 35 40 45 50 0 50 100 150 200 250 300 350 400 fre qu e n c y [ khz] d u t y [ % ] ct=1500pf ct=1200pf ct=1000pf ct=820pf fr e qu e n c y vs de adtime 0 100 200 300 400 500 600 700 800 0 50 100 150 200 250 300 350 400 fre qu e n c y [ kh z] d e a d t i m e [ n s ] ct=1500pf ct=1200pf ct=1000pf ct=820pf fig. 13 duty/dead time vs frequency fig. 14 vsen output timing diagram
shindengen electric mfg.co.,ltd - 15 - confidential 2.4.4 soft start function (sst ) llc unit has soft - start f unction . the frequency gradually decreases according to charging of capacitor connected between sst and gnd . sst capacitor starts to be charged subject to following two conditions. (1) vc1 voltage exceeds s tartup threshold voltage vc1(start) 12.6v (2) v sen voltage exceeds 3.55v ( at as mode off) or 1.00v ( at as mode on). llc gate output starts when sst voltage exceeds 0.6v , and t hen sst voltage is stabilized in 2.1v . llc gate output stops if sst voltage decreases to 0.5v or less. for the relationship be tween sst voltage and frequency , refer to fig . 15 . in addition, sst equip s a timer latch function to decrease the stress on mosfets and/or peripheral components in abnormal conditions . for d etails , refer to s ection 2. 4 . 8 . 2.4.5 over current protection (csl) ocp (over current protection) operates by detecting peak current of resonant tank with pulse by pulse at csl . t he detection threshold voltage is + / - 0.3 50 v ( ocp input threshold voltage.) and is low enough to minimize ineffective power loss of sensing resistor. when csl voltage exceeds ocp input threshold voltage, the gate output turn s off and fbl capacitor immediately starts charging and simultaneously charging sst capacitor, and consequently output current is limite d with pulse by pulse. (s ee fig . 1 6 .) in next cycle just after ocp detection, fbl capacitor stops discharging when fbl bottom voltage reaches 1.9v , thus, on - time is limited to avoid below - resonant. (s ee fig . 1 6 .) n ote that di/dt threshold is about 1/6 of ocp threshold. in order to prevent malfunction of ocp due to switching noise induced by mosfet , ocp - mask period is adopted as shown in fig.16 . during the ocp - mask period, ocp detection does not work (period of fbl (top) to mask voltage, 2.8v ). a filt er is built - in in csl to prevent malfunction due to random noise, and the filter causes delay time of around 200ns, that is the period of ocp detection to fbl starting to charge. v s st vs fre qu e n c y 0 50 100 150 200 250 300 350 400 450 500 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 v ss t [ v] f r e q u e n c y [ k h z ] ct=1500pf ct=1200pf ct=1000pf ct=820pf fig. 15 fss characteristics
shindengen electric mfg.co.,ltd - 16 - confidential 2.4.6 di/d t mode protection (csl) the mcz520 5se adopts pulse by pulse bidirectional di / dt protection to avoid below resonant mode operation. this function helps to avoid di / dt hard switching mode of mosfet s in below zvs boundary operation. when csl voltage decreasi ng to 60mv , instantaneous ly fbl starts charging and gate drive turn s off. in negative current direction, it operates in the same manner with threshold voltage of - 60mv . d i / dt c harge t imer o peration varies depending on as mode on or as mode off. ( s ee se ction 2. 5 . 1 ) (1) as mode off : timer capacitor is not charged . (2) as mode on : timer capacitor is charged . during ocp - mask period ( fbl (top) to mask voltage, 2.8v ), di/dt detection does not work t o prevent the malfunction due to noise. fig. 16 o ver current protection d / dt internal filter delay + 0 . 06 v vgh vgl fbl ( bottom ) fbl ( top ) - 0 . 06 v mask voltage 2 . 8 v csl 0 v di / dt masking time fig. 17 di/dt protection
shindengen electric mfg.co.,ltd - 17 - confidential 2.4.7 di/dt protection at startup (tss(3)) the MCZ5205SE has another di/dt protection at startup state to prevent the turn - off of gate drive during period of body diode. on 2 nd vgl gate drive pulse, increase the on - time width by decreasing the voltage to start charging to 0.8v , consequently the gate drive turns - off after mosfet current starts to flow. t he operation s equence is shown in fig.18 . 2.4.8 timer latch protection (sst) sst capacitor starts charging to either case below. (1) ocp detection (2) di/dt detection under as mode on sst capacitor starts charging and continu al abnormal condition keeps charging sst capacitor with 40 ua constant ly until sst voltage reache s 3. 6 v . once sst terminal voltage reache s 3 .6 v , g ate output stops and sst capacitor start discharging with 6 ua constant ly until sst voltage decreases to 0.3 5 v . at the moment sst voltage reache s 0.3 5 v , sst capacitor re st art s charging with 28ua constantly, then, the soft start operation restarts . timer counter counts the number of times of 3 .6 v char g ing. if count is twice, output latche s off. if abnormal condition is eliminated and the controller recovers normal operatio n before the two counts, sst capacitor starts discharg ing with 500u a and the counting result is reset. to release the latch, restart with vc1 less than 8 .1 v . l atch counter is reset by either condition below. (1) sst voltage reaches 2.1v by continual ocp dete ction. (2) ss refresh ing operation (vc1 on/off operation ) timing chart is shown in fig.1 9 . fig. 18 tss(3) operating sequence
shindengen electric mfg.co.,ltd - 18 - confidential 2.4.9 high side floating vcc (vb) floating high side gate drive voltage source ( vb ) is produce d by stabilized vc2 of 10 .2 v through bootstrap circuit . recommended components at pfc output voltage of 400v are : 600v soft recovery type ufrd (ultra fast recovery diode) d1nk60 (shindengen) or d1fk60 (shindengen) for d boot 16v , 0.1 to 1.0uf mcll for c boot vb = vc2 ? vf ( forward voltage of d boot ) sst llc id a b nomaly detection signal ( ic internal ) vtimer 1 2 . 1 v vtimer 2 over load mode momentary overload vc 1 vc 1 ( stop ) 8 . 5 v vc 1 ( start ) 12 . 6 v ocp operation 0 . 35 v 3 . 6 v 0 . 6 v 1 . 5 v ocp operation ocp operation fig. 1 9 sst operating sequence np dboot cboot 0 . 1 uf 16 v d 1 nk 60 d 1 fk 60 vc 2 pgnd mcz 5205 se vb vs vgh vgl fig. 20 boot strapping config u ration
shindengen electric mfg.co.,ltd - 19 - confidential 2.5 others 2.5.1 active standby (as) the MCZ5205SE adopt s acti ve standby function contributing to los s reduction at light load condition . the example circuit is shown in fig . 21 . active standby function operates as below. (1) as mode on : if as voltage reaches 0.8v or less. (2) as mode off : if as voltage reaches 1.0v or more. (3) as latch stop : if as voltage reaches 4.5v or more . to release the latch, restart with vc1 of 8 .1 v or less . connect a capacitor of 1000 to 10000pf between as terminals to prevent malfunction due to noise even where as function is not used. note that as voltage is set to 2.4v at as load open. following operations are provided after shifting to as mode. for detailed timing diagram, refer to fig.22 . (1) llc operating mode : switched from symmetric opera tion to a symmetric operation . (2) vsen ss - reset threshold : switched from 3.5 5 v /3.25v to 1.0 v /0.9v. (3) timer charge (di/dt mode) : switched from ? disable ? to ? enable ? . (4) pfc operating mode : switched from ?oscillation start ? to ?oscillation stop ? . asymmetric operation can lower the peak current at light load condition and pfc oscillation stops resulted in significant efficiency improvement at light load . vsen ss - reset threshold is automatically switched so that llc oscillation continues even when the pfc oscillation stops. this function does n o t require any additional components. in addition, as mode on enables charging sst capacitor at di/dt mode to provide ocp . soon after switching from as mode o n to as mode o ff , comp star t s charging and pfc starts operation when comp voltage reaches 0.8v or more. then, fbp voltage exceeds 2v and vsen ss - reset threshold switches, llc operation mode switches to symmetric mode (normal operation mode). as has a latch stop function. if as volt age exceed s as latch stop voltage 4.5v, pfc and llc oscillatio n immediately stop s unlike sst timer latch . to release the latch, restart at vc1 of 8 .1 v or less . fig. 21 as mode circuit example
shindengen electric mfg.co.,ltd - 20 - confidential fig. 22 as mode sequence
shindengen electric mfg.co.,ltd - 21 - confidential 2.5.2 over temperature protection (t sd) the MCZ5205SE adopt s ov er temperature protection. ( tsd : thermal shut down) that stop s the oscillation of pfc and also llc. t he o perating condition is minimum 140 c . tsd is released on condition that the temperature decreases by 40 c less than the temp erature at which tsd operated. 2.6 r emarks 2.6.1 pfc stand - alone operation connect sst to gnd to disable llc . 2.6.2 llc stand - alone operation connect comp to gnd to disable pfc . to operate the llc, vsen >3.5 5 v should be applied . ( as mode off) if intending to start llc operation at low input voltage, apply 3.5 5 v or more on vsen . vsen sink current should be limited to around 2ma . n ote that this operation should be for test purpose only. do not switch on/off the vbulk when vsen is externally biased to protect mosfet from undesired heavy swi tching stress especially in mid / heavy load condition. if using the as mode , fbp > 2. 0v should be applied.
shindengen electric mfg.co.,ltd - 22 - confidential 3 peripheral components setting 3.1 pfc zcs turn on timing (zc) pfc on timing is determined by the current limit ing resistor rzc as shown in fig . 23 . zc sink/source current limit is +/ - 5ma. the resistor limits the current to +/ - 5ma or less . t he polarity of nc winding should be designed according to fig . 23 . the voltage of nc winding at maximum input voltage must be greater than 1.55v . design the number of turns of nc winding on the minimum integer according to an formula(1) . for example, in case of vin ( ac) max = 264v , vo = 390v and np=50 turn s , nc = 4.5 is obtained from formula , therefore it should be 5 turn s . estimated number of turns np and nc is 10:1 . (vin max=264v cases.) max] ) ac ( vin [ vo np . nc ? ? ? ? ? ? ? ---- ( 1) if designing zc current as + / - 4ma (80% of ma ximum value), select a value of rzc greater than the value calculated from the formula (2) and (3) below. a resist or of 700 ohms is built in zc in series. [control winding pulse side] ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? np nc min vin vo r zc [ohm] ---- ( 2) * 6v : zc built - in zener voltage [control winding minus side] ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? np nc max vin r zc [ohm] ---- ( 3) [design example] at vo=400[v], vin(ac)max=276[v] , np=50[turn s ] , nc=5[turn s ] , [control winding pulse side] ? ? ] kohm [ . r zc ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? [control winding minus side] ? ? ] kohm [ . r zc ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? thus, zc current limit ing resistor r zc can be designed as 9.1 kohm or greater . fig. 23 zc limit ing resistance
shindengen electric mfg.co.,ltd - 23 - confidential 3.2 pfc phase compensation ( comp) pfc feedback amp is trans - conductance amplifier (gm amp). f ig.24 shows a circuit for pfc phase compensation. t he value of ccomp1, ccomp2, and rcomp are calculated from following formula . finally adjust the values in actual circuit . d etermine the value of cc omp1 and ccomp2 according to formula (4) , so that fc(cut off frequency) is 20hz or less. ? ? ] hz [ ccomp ccomp u fc ? ? ? ? ? ? ? ? ? ? ??? (4) * 140u: the conductance of gm amp recommended value of ccomp2 is around 0.1u f , and rcomp is 4.7 k to 47k ohm respectively . 3.3 pfc output voltage / ovp threshold (fbp terminal ) pfc output voltage is determined by resistance divider ( r efer to fig . 2 5 ) and is obtained from formula (5). r fbph value of about 2mohm is recommended for pfc output voltage of 400 v. i t is effective to connect a capacitor ( c fbp ) of around 1000pf between fbp and gnd for avoiding malfunction due to noise . * note : capacitance of c fbp may affect feedback characteristic and i t is necessary to check and adjust the value in actua l operating circuit . ? ? fbpl fbpl fbph r r r . vo pfc ? ? ? ? ? [v] ---- (5) pfc ovp detection voltage is obtained from formula (6). r ated voltage of pfc output capacitor should be selected with considering the detection voltage pulse margin . ? ? fbpl fbpl fbph r r r . ) ovp ( vo pfc ? ? ? ? ? ? ---- (6) fig. 24 comp circuit fig. 25 fbp resistance divider
shindengen electric mfg.co.,ltd - 24 - confidential 3.4 pfc ocp setting (csp) pfc over current protection points is obtained from formula (7). ps is output power of pfc at the point on which over - current protection works . n is efficiency of pfc. ? ? ps vo . ac vo ac . r min min csp ? ? ? ? ? ? ? ? ? ? ? ? ? [ohm] ---- (7) 3.5 llc brown out protection ( vsen ) vsen ss reset threshold voltage is 3.55v/3.25v . (as mode off) vsen ss reset th reshold voltage is 1. 0v/0.9v . ( as mode on) 0.2ua is required for vsen sink current and 20ua or more is recommended not to be affected by the sink current. if pfc output voltage is 400v, rvsenseh value of 2mohm is recommended. connect a capacitor of 3300 to 10000pf between vse n and gnd for noise reduction. low side resistor, rvsense l(init) is obtained from formula (8) . c orrect value of vbulkreset threshold is obtained from formula (9) by using actual value of rvsensel. as mode on is obtained from formula ( 10 ) . ---- ( 8) ---- ( 9) ---- ( 10) fig. 26 vsen internal circuit r v s e n s e h r v s e n s e l ss reset + - vbulk input vc 1 uvlo vc 1 vc 2 internal vref 5 v 3 3 0 0 p f ~ 1 0 0 0 0 p f as off 3 . 5 v / 3 . 2 v as on 1 . 0 v / 0 . 9 v as pin low : as on 9 . 0 r r r v 3.25 r r r v 3.25 - v r 3.25 r vsensel vsensel vsenseh on) (as bulkreset vsensel vsensel vsenseh bulkreset bulkreset vsenseh (init) vsensel ? ? ? ? ? ? ? ?
shindengen electric mfg.co.,ltd - 25 - confidential 3.6 llc oscillator / feedback (fbl) llc oscillator frequency is controlled by fbl. fbl sets dead time and soft start ( fss ), max frequency ( fmax ) and min frequency ( fmin ) . 3.6.1 dead time and soft start frequency (ct capacitor) d ead time and soft start frequency fss are determined by ct capacitance. s elect a ct capacitance from characteristic specification sheet. c apacitance value of ct of 820pf to 2200pf is recommended due to the relation with dead time . 3.6.2 minimum freque ncy fmin (rt resistance) minimum frequency fmin is determined by rt resistance. ( connect between fbl and gnd .) relation between rt resistance and frequency is shown in characteristic specification sheet. the estimate d value of fmin is ob tained from form ula (11) to (13). tcharge is dead time and tdischarge is turn on time of vgl/vgh . the exact value should be adjusted by using characteristic specification sheet after checking the frequency at actual circuit operation. vfbl(bottom) : 1.70v , vfbl(top) : 3 .15v * note : this value does not includ e overshooting and the response delay. r esponse delay is about 100ns. 3.6.3 maximum frequency fmax (fb resi stance) maximum frequency fmax is determined rt resistance and fb resistance. c heck the characteristic specification sheet and determine the maximum frequency . ) bottom ( ) bottom ( ) top ( ) top ( e arg ch vfbl . rt vfbl ct rt vfbl . rt vfbl ct rt t ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ---- ( 11) ) top ( ) bottom ( e arg disch vfbl vfbl ln ct rt t ? ? ? ? ---- ( 12) ? ? e arg disch e arg ch min t t f ? ? ? ? ? ---- ( 13)
shindengen electric mfg.co.,ltd - 26 - confidential 3.7 llc soft start / protection delay timer (sst) soft start charging current is 28ua . when sst voltage rises to 0.6 v , gate output starts and timer charging is enabled when sst voltage rises to 1.5v . soft start time tss is a time in which sst voltage rises from 0.6v to 1.5v . soft start time tss is obtained from formula (1 4 ). ---- (1 4 ) timer charging current is 40ua and t imer threshold voltage is 3.6v . thus, timer charging time ttimer is obtained from formula (1 5 ). ---- (1 5 ) timer discharge current is 6ua . timer intermittent operation time is obtained from formula (1 6 ) ---- (1 6 ) 3.8 llc current limiting / capacitive mode protection (csl) rocpdet is calculated from desi red ocp threshold ipk by using f ormula ( 1 7 ). tentative value of rocpl(init) is obtained from formula( 1 8 ) and correct value of i d is calculated from formula( 1 9 ) by using actual value of rocpl . rocph of 10 to 47 ohm is recommended considering ocp terminal sourcing current (95ua). i d value should be determined with care to have enough margins in low input voltage / pomax or switching load condition. connect a noise reduction capacitor of a round 1000pf to 10000pf between csl to gnd . fig. 27 csl peripheral circuit ? ? ? ? ? ? ? ? ? ? ? ss ss c . t ? ? ? ? ? ? ? ? ? ? ? ss timer c . t ? ? ? ? ? ? ? ? ? ? ? ss ) ermittent (int timer c . t ) ( ] a [ 0.35 r r r r i ) ( ] ohm [ 0.35 r ipk r 0.35 r ) ( ] ohm [ ipk 0.35 r det ocp ocpl ocpl ocph d det ocp ocph ) init ( ocpl det ocp ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??? ??? ???
shindengen electric mfg.co.,ltd - 27 - confidential 3.9 pfc output voltage and llc brown out protection ( in case of common sensing line for fbp and vsen ) if vsen and fbp have a common sensing line, circuit diagram is shown in fig . 2 8. rh value of 2mohm is recommended in case of 400v of pfc output voltage . 1000pf is recommended as c vsen capacitance value and also c fbp capacitance value. * note : capacitance value of c vsen and c fbp is related to feedback characteristic , and i t i s necessary to check and adjust the value by actual operating circuit . value of r fbp is obtained from formula (20). value of r vsen is obtained from formula (2 1 ). ---- (20) ---- (21) pfc out + llc input fig. 28 vsen fbp voltage dividing resi s tors ? ? ? ? ? ? ? ? ? ? ? ? . v vo pfc v r . r bulkreset bulkreset h fbp fbp bulkreset h vsen r . v r . r ? ? ? ? ? ? ? ? ? ?
shindengen electric mfg.co.,ltd - 28 - confidential 4 circuit diagram 4.1 typical application circuit (llc dual output)
shindengen electric mfg.co.,ltd - 29 - confidential 5 dimension 5.1 sop22 (MCZ5205SE)
shindengen electric mfg.co.,ltd - 30 - confidential notes:

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