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?2006 fairchild semiconductor corporation 1 www.fairchildsemi.com march 2006 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) fps tm is a trademark of fairchild semiconductor corporation FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) features ? current mode pwm control with a fixed operating fre- quency (300khz) ? pulse by pulse current limit ? over load protection ? over voltage protection ? thermal shutdown ? line under voltage detection and sleep on/off function ? internal high voltage sensefet (200v) ? supports forward or flyback topology applications ? dc-dc converter ? poe device related application notes ? an4137 - design guidelines for off-line flyback converters using fairchild power switch (fps) ? an4140 - transformer design consideration for off-line fly- back converters using fairchild power switch ? an4141 - troubleshooting and design tips for fairchild power switch flyback applications ? an4148 - audible noise reduction techniques for fps applications description the fs6x-series is specially designed for off-line dc-dc con- verters with minimal external components. this device com- bines a current mode pwm controller with a high voltage power sensefet in a single package. the pwm controller includes integrated fixed frequency oscillator, line under voltage lockout, sleep on/off function, thermal shutdown protection, over voltage protection, pulse-by-pulse current limit, and temperature com- pensated precise current sources for a loop compensation. compared with the discrete mosfet and pwm controller solu- tion, the fs6x-series can reduce total cost, component count, size, and weight, while simultaneously increasing efficiency, productivity, and system reliability. table 1. maximum output power note: 1. maximum practical continuous power in an open frame design at 50 c ambient. ordering information note: 2. x : tape & reel output power table (1) product 36v dc ~72v dc FS6X0420Rj 14w fs6x0720rj 26w fs6x1220rj 36w part number operating temp. range pb-free package packing method marking code FS6X0420Rj -25 c to +85 c yes d2-pak-6l tube 6x0420r fs6x0720rj -25 c to +85 c yes d2-pak-6l tube 6x0720r fs6x1220rj -25 c to +85 c yes d2-pak-6l tube 6x1220r FS6X0420Rjx -25 c to +85 c yes d2-pak-6l tape & reel 6x0420r fs6x0720rjx -25 c to +85 c yes d2-pak-6l tape & reel 6x0720r fs6x1220rjx (2) -25 c to +85 c yes d2-pak-6l tape & reel 6x1220r
2 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) typical application diagram figure 1. typical flyback application internal block diagram figure 2. functional blo ck diagram of fs6x-series drain gnd vfb vcc pwm dc in dc out l/s v sl v lu 9v/15v 3 1 2 4 6 vref line uvlo enable internal bias s q q r osc v cc v ref i delay i fb v sd tsd v ovp v cc line uvlo s q r r 28r v cc good v cc drain line sense fb gnd gate driver 5 n.c q v cc good
3 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) pin assignments figure 3. pin configuration (top view) pin definitions pin number pin name pin function description 1 drain this pin is the high voltage power sensefet drain connection. 2 gnd this pin is the control ground and the sensefet source. 3vcc this pin is the positive supply input. this pin provides internal operating current for both start-up and steady-state operation. 4 feedback (fb) this pin is internally connected to the inverting input of the pwm comparator. the collec- tor of an opto-coupler is typically tied to this pin. for stable operation, a capacitor should be placed between this pin and gnd. if the voltage of this pin reaches 7.5v, the over load protection is activated resulting in shutdown of the ic. 5 n.c. this pin is not connected. 6 line sense (ls) according to the voltage of this pin, three operation modes are defined: normal operation mode, line under voltage lock out mode, and sleep mode. if the voltage of this pin is smaller than 2.55v, the ic goes into the line under voltage lock out, stopping switching operation. if the voltage of this pin is smaller than 1.8v, the ic enters into sleep mode. during sleep mode, reference voltage generation circuit including the shunt regulator is disabled and only 300ua operation current is required. 6. line sense 5. n.c. 4. vfb 3. vcc 2. gnd 1. drain d2-pak-6l
4 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) absolute maximum ratings (ta=25 c, unless otherwise specified . ) note: 1. repetitive rating: pulse width limi ted by maximum junction temperature. thermal impedance note: 1. infinite cooling condition - refer to the semi g30-88. parameter symbol value unit drain-source voltage v dss 200 v pulsed drain current (tc=25 c) (1) i dm FS6X0420Rj 10.2 a fs6x0720rj 16.2 fs6x1220rj 23.7 continuous drain current (tc=25 c) i d FS6X0420Rj 3.4 a (rms) fs6x0720rj 5.4 fs6x1220rj 12.4 continuous drain current (tc=100 c) i d FS6X0420Rj 2.1 a (rms) fs6x0720rj 3.4 fs6x1220rj 7.9 supply voltage v cc 35 v input voltage range v fb -0.3 to v cc v total power dissipation (tc=25 c) p d FS6X0420Rj 43 w fs6x0720rj 54 fs6x1220rj 125 operating junction temperature t j internally limited c operating ambient temperature t a -25 to +85 c storage temperature range t stg -55 to +150 c parameter symbol value unit junction-to-ambient thermal ja - c/w junction-to-case thermal (1) jc FS6X0420Rj 2.9 c/w fs6x0720rj 2.3 fs6x1220rj 1.0
5 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) electrical characteristics (ta=25 c, unless otherwise specified.) notes: 1. pulse test: pulse width 300 s, duty 2%. 2. these parameters, although guaranteed at the design, are not tested in mass production. 3. these parameters indicate the inductor current. parameter symbol condition min. typ . max. unit sense fet section drain source breakdown voltage bv dss v gs = 0v, i d = 250 a 200 220 - v zero gate voltage drain current i dss v ds = 200v, v gs = 0v - - 250 a v ds = 160v v gs = 0v, t c = 125 c --250 a static drain source on resistance (1) r ds(on) FS6X0420Rj v gs = 10v, i d = 2.5a -1.21.5 fs6x0720rj - 0.64 0.75 fs6x1220rj - 0.24 0.30 output capacitance c oss FS6X0420Rj v gs = 0v v ds = 25v, f = 1mhz -3245 pf fs6x0720rj - 49 65 fs6x1220rj - 125 160 control section initial frequency f osc - 270 300 330 khz voltage stability f stable 12v vcc 23v 0 1 3 % temperature stability (2) f osc -25 c ta 85 c0 510 % maximum duty cycle d max -728088% minimum duty cycle d min ---0% start threshold voltage v start v fb = gnd 14 15 16 v stop threshold voltage v stop v fb = gnd 8 9 10 v feedback source current i fb v fb = gnd 0.7 0.9 1.1 ma protection section peak current limit (3) i limit FS6X0420Rj - 1.2 1.4 1.6 a fs6x0720rj 2.3 2.7 3.1 fs6x1220rj 2.8 3.2 3.6 over voltage protection v ovp v cc > 6.9v 23 25 27 v thermal shutdown temperature (2) t sd - 140 160 - c shutdown feedback voltage v sd v fb 6.9 v 6.9 7.5 8.1 v shutdown delay current i delay v fb = 5v 4.0 5.0 6.0 a
6 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) electrical characteristics (ta=25 c, unless otherwise specified.) notes: 1. this parameter is the current flowing into the control ic. parameter symbol condition min. typ . max. unit total device section startup current (1) i start v fb = gnd, v cc = 14v - 60 120 ua sleep mode current i sleep v = 1v, v cc = 16v - 300 500 ua operating supply current (1) i op v fb = gnd, v cc = 16v -1015ma i op(min) v fb = gnd, v cc = 12v i op(max) v fb = gnd, v cc = 20v line uvlo threshold voltage v lu - 2.4 2.55 2.7 v sleep on/off threshold voltage v sl -1.51.82.1v
7 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) typical performance characteristics (these characteristic graphs are normalized at ta= 25 c.) figure 4. operating current vs. temp figure 5. stop thresh old voltage vs. temp figure 6. maximum duty vs. temp figure 7. start threshold voltage vs. temp figure 8. operating frequency vs. temp figure 9. feedback source current vs. temp -25 temp [ ] 0 25 50 75 100 125 150 10.5 11.0 [ma] 10.0 9.5 9.0 -25 temp [ ] 0 25 50 75 100 125 150 9.25 9.50 [v] 9.00 8.75 8.50 -25 temp [ ] 0 255075100125150 80.5 81.0 [%] 80.0 79.5 79.0 15.5 16.0 [v] 15.0 14.5 14.0 -25 temp [ ] 0 25 50 75 100 125 150 -25 temp [ ] 0 25 50 75 100 125 150 303.0 305.0 [khz] 301.0 299.0 295.0 297.0 1.05 1.10 [ma] 0.95 0.90 0.80 -25 temp [ ] 0 25 50 75 100 125 150 1.00 0.85
8 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) typical performance characteristics (continued) (these characteristic graphs are normalized at ta= 25 c) figure 10. shutdown fb voltage vs. temp figure 11. over voltage protection vs. temp figure 12. start up current vs. temp figure 13. shutdown delay current vs. temp figure 14. lineuvlo threshold voltage vs.temp figure 15. current limit vs. temp -25 temp [ ] 0 25 50 75 100 125 150 7.55 7.60 [v] 7.50 7.45 7.40 -25 temp [ ] 0 25 50 75 100 125 150 25.5 26.0 [v] 25.0 24.5 24.0 58 60 [ua] 54 52 50 -25 temp [ ] 0 25 50 75 100 125 150 56 -25 temp [ ] 0 25 50 75 100 125 150 5.2 5.3 [ua] 5.0 4.8 4.7 5.1 4.9 -25 temp [ ] 0 25 50 75 100 125 150 2.6 2.7 [v] 2.5 2.4 2.3 -25 temp [ ] 0 25 50 75 100 125 150 3.25 3.30 [a] 3.15 3.00 3.20 3.10 3.05
9 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) applications information 1. startup to guarantee stable operation of the control ic, vcc has under voltage lockout (uvlo) with 6v hysteresis. figure 16 shows the relation between the supply current (icc) and the supply voltage (vcc). before vcc reaches 15v, the start-up current is 60 a, which is usually provided by the dc link through start-up resis- tor. when vcc reaches 15v, the control ic begins operation and the operating current increases to 10ma as shown. once the control ic starts operation, it continues its normal operation unless vcc goes below the stop voltage of 9v. figure 16. relation between supply current and voltage 2. feedback control the fs6x-series employs current mode control. the voltage of the feedback pin is compared with the current sense voltage for pulse width modulation (pwm). figure 17 illustrates the simpli- fied pwm block. the feedback voltage determines the peak drain current of the sensefet. usually, an opto-coupler, along with the tl431(shunt regulator) are used to implement the feed- back network. the collector of the opto-coupler transistor is connected to the feedback pin and the emitter is connected to the ground pin. when the voltage of the reference pin of the tl431 exceeds the internal reference voltage of 2.5v, the opto- coupler diode current increases, pulling down the feedback volt- age. figure 17. pulse width modulation (pwm) cir- cuit 3. protection circuit besides pulse-by-pulse current limit, the fs6x-series has the following self protection functions: over load protection (olp), over voltage protection (ovp), and thermal shutdown (tsd). because these protection circuits are fully integrated into the ic without external components, the reliability is improved. in the event of a fault condition, fs6x-series enters into auto-restart operation. once the fault condition occurs, switching operation is terminated, and the mosfet remains off, which causes vcc to be reduced. when vcc reaches 9v, the protection is reset and the supply current reduces to 60ua. then, vcc begin to increase with the current provided through the start-up resistor. when vcc reaches 15v, fs6x-series resumes its normal oper- ation if the fault condition is removed. in this manner, the auto- restart alternately enables and disables the switching of the power mosfet until the fault condition is eliminated as illus- trated in figure 18. figure 18. auto restart operation after protec- tion 3.1 pulse-by-pulse current limit as shown in figure 17, the drain current of the power mosfet is limited by the inverting input of pwm comparator (vfb*). assuming that the 0.9ma current source flows only through the internal resistor (28r +r= 2.9k), the cathode voltage of diode d2 is about 2.6v. since d1 is blocked when the feedback volt- age (vfb) exceeds 2.6v, the maximum voltage of the cathode of d2 is 2.6v. therefore, the maximum value of vfb* is about 0.1v, which limits the peak value of the power mosfet drain current. icc vcc vstop=9v 60ua 10ma vstart=15v vz 4 osc vcc vref 5ua 0.9ma v sd r 28r fb gate driver olp d1 d2 vfb* vfb 431 cfb vo fault situation 9v 15v vcc vds icc 10ma 60ua t fault occurs fault removed normal operation normal operation power on
10 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) 3.2 over load protection (olp) overload means that the load current exceeds a pre-set level due to an abnormal situation. in this situation, the protection cir- cuit should be activated to protect the smps (switch mode power supplies). however, even when the smps is in normal operation, the over load protection circuit can be activated dur- ing the load transition. to avoid this undesired operation, the over load protection circuit is designed to be activated after a specified period to determine whether it is a transient situation or an overload situation. because of the pulse-by-pulse current limit capability, the maximum peak current through the smps is limited, and therefore the maximum input power is restricted with a given input voltage. if the output consumes beyond this maximum power, the output voltage (vo) decreases below the set voltage. this reduces the current through the opto-coupler diode which also reduces opto-coupler transistor current increasing vfb. if vfb exceeds 2.6v, d1 is blocked and the 5ma current source starts to charge cfb slowly compared to when the 0.9ma current source charges cfb. in this condition, vfb continues increasing until it reaches 7.5v, and the switching operation is terminated at that time as shown in figure 19. the delay time for shutdown is the time required to charge cfb from 2.6v to 7.5v with 5ma. when cfb is 10nf (103), t12 is approxi- mately 9.8ms and when cfb is 0.1mf (104), t12 is approxi- mately 98ms. these values are enough to prevent smps from being shut down during transient situations. figure 19. over load protection 3.3 over voltage protection (ovp) in the case of a malfunction in the secondary side feedback cir- cuit, or feedback loop open caused by a defect of solder, the current through the opto-coupler transistor becomes almost zero. then, vfb climbs up in a similar manner to the over load situation, forcing the preset maximum current to be supplied to the secondary side until the over load protection is activated. because more than required energy is provided to the output, the output voltage may exceed the rated voltage before the over load protection is activated, resulting in the breakdown of the devices in the secondary side. to prevent this situation, an over voltage protection (ovp) circuit is employed. in general, vcc is proportional to the output voltage and fs6x-series uses vcc instead of directly monitoring the output voltage. if vcc exceeds 25v, ovp circuit is activated resulting in termination of switching. to avoid undesired activation of ovp during normal operation, vcc should be properly designed to be below 25v. 3.4 thermal shutdown (tsd) the thermal shutdown circuitry senses the junction tempera- ture. the threshold is set at 160c. when the junction tempera- ture rises above this threshold (160c), the power mosfet is disabled. 4. line uvlo and sleep mode according to the voltage of the line sense pin, three operation modes are defined: normal operation mode, line under voltage lock out mode, and sleep mode, as shown in figure 20. when the voltage of this pin is over 2.55v, fs6x-series operates in normal mode. when the voltage of this pin is less than 2.55v, it goes into line under voltage lock out mode terminating switching operation. when the voltage of this pin is less than 1.8v, it enters into sleep mode. during sleep mode, the reference volt- age generation circuit, including the shunt regulator, is disabled and only 300ma operation current is required. figure 20. line sense block v fb t 2.6v 7.5v over load protection t 12 = cfb*(7.5-2.6)/i delay t 1 t 2 v sl (1.8v) v lu (2.5v) 9v/15v 3 6 vref line uvlo enable internal bias vcc good line sense vcc vin r1 r2 sleep on off
11 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) typical application circuit features ? high switching frequency(300khz) ? high power density ? low component count ? enhanced system reliability through various protection functions key design notes ? capacitor c104 is employed to reduce the noise on sensed line voltage. ? the delay time for over load protection is designed to be about 12ms with c103 of 22nf. if a faster triggering of olp is requir ed, c103 can be reduced to 10nf. 1. schematic figure 21. demo circuit application output power input volt age output voltage (max current) poe device 15w 36-72vdc 5v (3.0a) ic101 fs6x1220r n.c 5 c101 47uf 100v r101 200k ? r102 100k ? c102 22uf 50v d102 1n4148 r105 15k ? c104 1nf r104 1 ? c103 22nf 50v d103 p6ke160ca c301 2.2nf 1kv r301 10 ? r221 15 ? r222 15 ? r223 15 ? t 1 : epc19 c222 1nf 50v c221 1nf 50v d201 stos15l25g c201 10nf 50v c202 10nf 50v c203 10nf 50v c204 10nf 50v l201 2.2uh c205 330uf 16v c210 10nf 50v r210 1k ? r210 1k ? r212 30k ? r214 18k ? r213 18k ? ic201 fod2741 dc input voltage: 36vdc~72vdc output : 5v / 3a 1 4 2 3 drain vcc gnd v fb 6 l/s
12 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) 2. transformer figure 22. transforme r schematic diagram 3. winding specifications 4. electrical characteristics 5. core & bobbin ? core: epc19 ? bobbin: epc19 ? ae(mm2): 22.7 no pin (s f) wire turns winding method np/1 1 11 0.35 1 25 center winding insulation: polyester tape t = 0.050mm, 2layers ns/1 6 50.4 3 4 solenoid winding insulation: polyester tape t = 0.050mm, 2layers np/2 2 10 0.35 1 25 center winding insulation: polyester tape t = 0.050mm, 2layers nvcc 9 30.3 1 12 center winding insulation: polyester tape t = 0.050mm, 2layers parameter pin specification remarks inductance 1,2 - 10,11 61uh 10% 100khz, 1v leakage inductance 1,2 - 10,11 8.8uh max 2 nd all short 1 10 11 5 4 3 2 7 n s/1 n p/1 n vcc 6 9 n p/1 n p/2 n vcc n s/1 8 n p/2 n s/2 n s/2
13 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) 6. demo circuit part list part value note part value note resistor capacitor r101 200k 1/4w c101 47uf/100v electrolytic capacitor r102 100k 1/4w c102 22uf/50v electrolytic capacitor r104 1k 1/4w c103 22uf/50v ceramic capacitor r105 18k 1/4w c104 1nf/50v ceramic capacitor r210 40k 1/4w c201 10uf/25v ceramic capacitor r201 1k 1/4w c202 10f/25v ceramic capacitor r211 1k 1/4w c203 10f/25v ceramic capacitor r212 30k 1/4w c204 10f/25v ceramic capacitor r213 18k 1/4w c205 330uf/16v electrolytic capacitor r214 18k 1/4w c210 10nf/50v ceramic capacitor r221 15k 1/4w c221 1nf/50v ceramic capacitor r222 15k 1/4w c222 1nf/50v ceramic capacitor r223 15k 1/4w c301 2.2nf/1kv film r301 10k 1/4w - - - -- - - - - diode ic d102 1n4148 ic101 fs6x1220rj fps tm d103 p6ke160ca tvs ic201 fod2741 optocoupler d201 stps15l25g - - - - -- - - - - inductor -- - l201 2.2uh - - - - -- - - - -
14 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) mechanical dimensions d2-pak-6l unit: mm
15 www.fairchildsemi.com FS6X0420Rj/ fs6x0720rj/ fs6x1220rj rev. 1.0.1 FS6X0420Rj/ fs6x0720rj/ fs6x1220rj fairchild power switch (fps?) disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information preliminary no identification needed obsolete this datasheet contains the design specifications for product development. specifications may change in any manner without notice. this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. formative or in design first production full production not in production isoplanar? littlefet? microcoupler? microfet? micropak? microwire? msx? msxpro? ocx? ocxpro? optologic ? optoplanar? pacman? pop? power247? poweredge? fast ? fastr? fps? frfet? globaloptoisolator? gto? hisec? i 2 c? i-lo ? implieddisconnect? intellimax? rev. i18 acex? activearray? bottomless? build it now? coolfet? crossvolt ? dome? ecospark? e 2 cmos? ensigna? fact? fact quiet series? powersaver? powertrench ? qfet ? qs? qt optoelectronics? quiet series? rapidconfigure? rapidconnect? serdes? scalarpump? silent switcher ? smart start? spm? stealth? superfet? supersot?-3 supersot?-6 supersot?-8 syncfet? tcm? tinylogic ? tinyopto? trutranslation? uhc? ultrafet ? unifet? vcx? wire? across the board. around the world.? the power franchise ? programmable active droop?

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