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rev.3.00 jun 15, 2005 page 1 of 28 ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp high speed current mode pwm control ic for switching power supply rej03f0149-0300 (previous: ade-204-028b) rev.3.00 jun 15, 2005 description the ha17384s/h and ha17385h are pwm control switching regulator ic series suitable for highspeed, current-mode switching power supplies. with ics from this series and a few external parts, a small, low cost flyback-transformer switching power supply can be constructed, which facilita tes good line regulation by current mode control. synchronous operation driven after an external signal can also be easily obtained which offers various applications such as a power supply for monitors small multi-output power supply. the ic series are composed of circuits required for a switchi ng regulator ic. that is a under-voltage lockout (uvl), a high precision reference voltage regulator (5.0 v 2%), a triangular wave oscillator for timing generation, a high-gain error amplifier, and as totem pole output driver circuit which directly drives the gate of power mosfets found in main switching devices. in addition, a pulse-by-pulse type, high -speed, current-detection comparator circuit with variable detection level is incorporated which is required for current mode control. the ha17384sps includes the above basic function circuits. in addition to these basic functions, the h series incorporates thermal shut-down protection (tsd) and overvoltage protection (ovp) functions, for configuration of switching power supplies that meet the demand for high safety levels. between the ha17384 and ha17385, only the uvl threshold voltages differ as shown in the product lineup table.(see next page.) this ic is pin compatible with the ?3842 family? ics made by other companies in the electronics industry. however, due to the characteristics of linear ics, it is not possible to achieve ics that offer full compatibility in every detail. therefore, when using one of these ics to replace another manufacturer?s ic, it must be recognized that it has different electrical characteristics, and it is necessa ry to confirm that there is no problem with the power supply (mounting) set used.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 2 of 28 functions ? under-voltage lockout system ? reference voltage regulator of 5.0 v 2% ? triangular wave (sawtooth) oscillator ? error amplifier ? totem pole output driver circuit (d irect driving for power mos fets) ? current-detection co mparator circuit for current mode ? ovp function (over voltage protection) * 1 ? tsd function (thermal shut-down protection) * 1 ? protect function by zener diode (b etween power input and gnd) note: 1. h series only. features ? high-safety uvl circuit is used (both v in and vref are monitored) ? high speed operation: ? current detection response time: 100 ns typ ? maximum oscillation frequency: 500 khz ? low standby current: 170 a typ ? wide range dead band time (discharge current of timing capacitance is constant 8.4 ma typ) ? able to drive power mosfet directly (absolute maximum rating of output current is 1 a peak) ? ovp function (over voltage protection) is included * 1 (output stops when fb terminal voltage is 7.0 v typ or higher) ? tsd function (thermal shut-down protection) is included * 1 (output stops when the temperature is 160 c typ or higher) ? zener protection is included (clamp voltage between v in and gnd is 34 v typ) ? wide operating temperature range: ? operating temperature: ?20 c to +105 c ? junction temperature: 150 c * 2 notes: 1. h series only. 2. s series only.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 3 of 28 product lineup package additional function uvl power supply threshold voltage dilp8 (dp-8b) sop8 (fp-8dc) tsd (thermal shut-down protection) ovp (over voltage protection) v th uvl (v) typ v tl uvl (v) typ ha17384sps ha17384srp ? ? ha17384hps HA17384HRP 16.0 10.0 ha17385hps ha17385hrp 8.4 7.6 pin arrangement 1 2 3 4 8 7 6 5 comp fb cs r t /c t vref v in out gnd (top view) pin function pin no. symbol function note 1 comp error amplifier output pin 2 fb inverting input of error amp./ovp input pin 1 3 cs current sensing signal input pin 4 r t /c t timing resistance, timing capacitance connect pin 5 gnd groung pin 6 out pwm pulse output pin 7 v in power supply voltage input pin 8 vref reference voltage 5v output pin note: 1. overvoltage protection (ovp) input is usable only for the ha17384h and ha17385h.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 4 of 28 block diagram oscillator totem pole output circuit note: 1. blocks with bold line are not included in ha17384sps/srp. 0.8ma ea ? + ovp ? + cs ? + 7.0v uvl1 h l vl vh uvl2 vref > 4.7v r q s 6.5v 1 2 vref (2.5v) * 1 2v f 160c 2r r 1v r s q pwm logic vref nor 8.4 ma 1.2v + ? or 34v 1 2 3 4 8 7 6 comp fb (ovp input) cs rt/ct vref v in out 5gnd 2.8 v out 5v band gap reference regulator ovp latch tsd sense cs latch latch set pulse
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 5 of 28 absolute maximum ratings (ta = 25 c) item symbol rating unit note supply voltage v in 30 v dc output current i o 0.1 a peak output current i o peak 1.0 a error amplifier input voltage v fb ?0.3 to v in v comp terminal input voltage v comp ?0.3 to +7.5 v error output sink current i oea 10 ma power dissipation p t 680 mw 1, 2 operating temperature topr ?20 to +105 c 125 c 3 junction temperature tj 150 c 4 ?55 to +125 c 3 storage temperature tstg ?55 to +150 c 4 notes: 1. for the ha17384hps and ha17385hps, this value applies up to ta = 43 c; at temperatures above this, 8.3 mw/ c derating should be applied. for the ha17384sps, this value applies up to ta = 68 c; at temperatures above this, 8.3 mw/ c derating should be applied. power dissipation p t (mw) ambient temperature ta (c) 680mw 374mw 43c 68c 150c 800 600 400 200 0 ? 20 0 20 40 60 80 100 120 140 160 166mw 105c 125c ha17384sps ha17384hps, ha17385hps
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 6 of 28 absolute maximum ratings (cont.) notes: 2. this is the value when the device is mounted on a glass-epoxy substrate (40 mm 40 mm 1.6 mm). however, for the HA17384HRP and ha17385hrp, derating should be performed with 8.3 mw/ c in the ta 43 c range if the substrate wiring density is 10%. derating should be perfo rmed with 11.1 mw/ c in the ta 63 c range if the substrate wiring density is 30%. for the ha17384srp, derating should be performed with 8.3 mw/ c in the ta 68 c range if the substrate wiring density is 10%. derating should be perfo rmed with 11.1 mw/ c in the ta 89 c range if the substrate wiring density is 10%. power dissipation p t (mw) ambient temperature ta (c) 374 mw 680 mw 43c 63c 150c 89c 800 600 400 200 0 ? 20 0 20 40 60 80 100 120 140 160 166 mw 500 mw 222 mw 68c 105c 125c ha17384srp : ?11.1 mw/c (wiring density is 30%) : ?8.3 mw/c (wiring density is 10%) HA17384HRP, ha17385hrp : ?11.1 mw/c (wiring density is 30%) : ?8.3 mw/c (wiring density is 10%) 3. applies to the ha17384hps/hrp and ha17385hps/hrp. 4. applies to the ha17384sps/srp.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 7 of 28 electrical characteristics (the condition is: ta = 25c, v in = 15 v, c t = 3300 pf, r t = 10 k ? without notice) ? reference part item symbol min typ max unit test condition note reference output voltage vref 4.9 5.0 5.1 v io = 1 ma line regulation regline ? 20 50 mv 12 v v in 25 v load regulation regload ? 10 25 mv ?1 ma io ?20 ma output short current los ?30 ?100 ?180 ma vref = 0v temperature stability ? vref ? 80 ? ppm/ c io = ?1 ma, ?20c ta 105 c 1 output noise voltage v n ? 100 ? v 10 hz fnoise 10 khz 1 note: 1. reference value for design. ? triangular wave oscillator part item symbol min typ max unit test condition note typical oscillating frequency fosc typ 47 52 57 khz c t = 3300 pf, r t = 10 k? maximum oscillating frequency fosc max 500 ? ? khz supply voltage dependency of oscillating frequency ? fosc 1 ? 0.5 2.0 % 12 v v in 25 v temperature dependency of oscillating frequency ? fosc 2 ? 5.0 ? % ?20c ta 105c 1 discharge current of c t isink ct 7.5 8.4 9.3 ma v ct = 2.0 v low level threshold voltage v tlct ? 1.2 ? v 1 high level threshold voltage v thct ? 2.8 ? v 1 triangular wave amplitude ? v ct ? 1.6 ? v ? v ct = v thct ? v tlct 1 note: 1. reference value for design. (the condition is: ta = 25 c, v in = 15 v, c t = 3300 pf, r t = 10 k ? without notice) ? error amplifire part / ovp part item symbol min typ max unit test condition note non-inverting input voltage v fb 2.42 2.50 2.58 v v comp = 2.5 v input bias current i ib ? ?0.2 ?2.0 a v fb = 5.0 v open loop voltage gain a vol 65 90 ? db 2.0 v v o 4.0 v unity gain bank width bw 0.7 1.0 ? mhz power supply voltage rejection ratio psrr 60 70 ? db 12 v v in 25 v output sink current i osink ea 3.0 9.0 ? ma v fb = 2.7 v, v comp = 1.1 v output source current i osource ea ?0.5 ?0.8 ? ma v fb = 2.3 v, v comp = 5.0 v high level output voltage v oh ea 5.5 6.5 7.5 v v fb = 2.3 v, r l = 15 k ? (gnd) low level output voltage v ol ea ? 0.7 1.1 v v fb = 2.7 v, r l = 15 k ? (vref) ovp latch threshold voltage v ovp 6.0 7.0 8.0 v increase fb terminal voltage 1 ovp (fb) terminal input current i fb(ovp) ? 30 50 a v fb = 8.0 v 1 ovp latch reset v in voltage v in(ovp res) 6.0 7.0 8.0 v decreasing v in after ovp latched 1 note: 1. these values are not prescribe to the ha 17384sps/srp because ovp function is not included.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 8 of 28 electrical characteristics (cont.) (the condition is: ta = 25 c, v in = 15 v, c t = 3300 pf, r t = 10 k ? without notice) ? current sensing part item symbol min typ max unit test condition note voltage gain a vcs 2.85 3.00 3.15 v/v v fb = 0 v 1 maximum sensing voltage vth cs 0.9 1.0 1.1 v power supply voltage rejection ratio psrr ? 70 ? db 12 v v in 25 v 2 input bias current i bcs ? ?2 ?10 a v cs = 2 v current sensing response time tpd 50 100 150 ns time from when v cs becomes 2 v to when output becomes ?l? (2 v) 3 notes: 1. the gain this case is the ratio of error amp lifier output change to the current-sensing threshold voltage change. 2. reference value for design. 3. current sensing response time tpd is definded a shown in the figure 1. v cs v out (pwm) vth tpd figure 1 definition of current sensing response time tpd ? pwm output part item symbol min typ max unit test condition note output low voltage 1 v ol1 ? 0.7 1.5 v losink = 20 ma output low voltage 2 v ol2 ? 1.5 2.2 v losink = 200 ma 1 output high voltage 1 v oh1 13.0 13.5 ? v losource = ?20 ma output high voltage 2 v oh2 12.0 13.3 ? v losource = ?200 ma 1 output low voltage at standby mode v ol stb ? 0.8 1.1 v v in = 5 v, losink = 1 ma rise time t r ? 80 150 ns c l = 1000 pf fall time t f ? 70 130 ns c l = 1000 pf maximum on duty du max 94 96 100 % minimum on duty du min ? ? 0 % note: 1. pulse application test
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 9 of 28 electrical characteristics (cont.) (the condition is: ta = 25 c, v in = 15 v, c t = 3300 pf, r t = 10 k ? without notice) ? uvl part item symbol min typ max unit test condition note 14.5 16.0 17.5 v 1 threshold voltage for high v in level v th uvl 7.6 8.4 9.2 v turn-on voltage when v in is rising 2 9.0 10.0 11.0 v minimum operating 1 threshold voltage for low v in level v tl uvl 6.8 7.6 8.4 v voltage after turn-on 2 5.0 6.0 7.0 v 1 v in uvl hysteresis voltage v hys uvl 0.6 0.8 1.0 v v hys uvl = v th uvl ? v tl uvl 2 vref uvl threshold voltage v t vref 4.3 4.7 vref v voltage is forced tovref terminal notes: 1. for the ha17384s/h. 2. for the ha17385h. ? total characteristics item symbol min typ max unit test condition note operating current i in 7.0 10.0 13.0 ma c l = 1000 pf, v fb = v cs = 0 v standby current i stby 120 170 230 a current at start up current of latch i latch 200 270 340 a v fb = 0 v after v fb = v ovp 1, 2 power supply zener voltage v inz 31 34 37 v i in + 2.5 ma overheat protection starting temperature tj tsd ? 160 ? c 3, 4 notes: 1. these values are not pr escribe to the ha17384sps/srp bec ause ovp function is not included. 2. v in = 8.5 v in case of the ha17384h. 3. these values are not prescribe to the ha1 7384sps/srp because tsd function is not included. 4. reference value for design.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 10 of 28 timing chart waveform timing (outline) signal name input voltage v in pin 7 uvl1 internal signal which cannot be externally monitored. reference voltage vref pin 8 uvl2 internal signal which cannot be externally monitored. oscillation voltage of triangular wave r t /c t pin 4 start up signal internal signal which cannot be externally monitored. pwm latch setting signal internal signal which cannot be externally monitored. error amplifier input signal v fb pin 2 error amplifier output signal v comp pin 1 i d * 1 ovp latch signal internal signal which cannot be externally monitored. power on ic turn on stationary operation ovp input ovp latched condition power off reset of ovp latch start up latch release ( ) shows the case using ha17385h pwm output voltage v out pin 6 note: 1. i d indicates the power mosfet drain current; it is actually observed as voltage v s generated by power mosfet current detection source resistance r s . v comp indicates the error amp output voltage waveform. current mode operation is performed so that a voltage 1/3 that of v comp is the current limiter level. 10 v (7.6 v) 7.0 v 2 v 16 v (8.4 v) 2 v 0v 0v 0v 0v 0v 0v 0v 0v 0v 0v 0v 5 v 4.7 v 2.8 v 1.2 v 7.0 v typ (ovp input) v comp i d v in 4.7 v ic operates and pwm output stops. this voltage is determined by the transformer
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 11 of 28 operation (description of timing chart) from power on to turn on after the power is switched on, the power supply terminal voltage (v in ) of this ic rises by charging through bleeder resistor r b . at this time, when the power voltage is in the range of 2 v to 16 v* 1 . the low-voltage, lock out uvl1 operates and accordingly the out voltage, that is, the gate voltage of the power mos fet, is fixed at 1.3 v or a lower value, resulting in the power mos fet remaining in the off state. when the power supply voltage reaches 16 v, uvl1 of this ic is reset and the reference voltage (vref) generating part turns on. however, until vref becomes 4.7 v, the low-volta ge, lock out uvl2 operates to keep the out terminal voltage low. after vref terminal voltage becomes 4.7 v or higher, out terminal outputs a pwm pulse. note: 1. the value is for the ha17384s/h. the value is 8.4 v for the ha17385h. generation of triangular wave and pwm pulse after the output of the vref, each blocks begins to op erate. the triangular wave is generated on the r t /c t terminal. for pwm pulses, the triangular wave rise time is taken as the variable on-duty on- time. the triangular wave fall time is taken as the dead-band time. the initial rise of the triangular wave starts from 0 v, and to prevent a large on-duty at this time, the initial pwm pulse is masked and not output. pwm pulses are outputted after th e second triangular wave. the above operation is enabled by the charge energy which is charged through the bleeder resistor r b into the capacitor c b of v in . stationary operation pwm pulses are outputted after the second wave of the triangular wave and stationary operation as the switching power supply starts. by switching operation from on/off to off/on in the switc hing device (power mos fet), the transformer converts the voltage. the power supply of ic v in is fed by the back-up winding of the transformer. in the current mode of the ic, the current in the switcing device is always monitored by a source resistor r cs . then the current limiter level is varied according to the error voltage (comp terminal voltage) for pwm control. one third of the error voltage level, which is divided by resistors ?2r? and ?r? in the ic, is used to sense the current (r = 25 k ? ). two diodes between the error output and the 2r-r circuit act only as a dc level shifter. actually, these diodes are connected between the 2r-r circuit and gn d, and, the current sensing comparator and gnd, respectively. therefore, these blocks operate 1.4 v higher than the gnd level. accordingly, the error of the current sensing level caused by the switching noise on the gnd voltage level is eliminated. the zener diode of 1 v symbo lically indicates that the maximum sensing voltage level of the cs terminal is 1 v.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 12 of 28 power off at power off, the input voltage of the transformer gradually decreases and then v in of ic also decreases according to the input voltage. when v in becomes lower than 10 v* 2 or vref becomes lower than 4.7 v, uvl1 (uvl2) operates again and the pwm pulse stops. note: 2. the value is for the ha17384s/h. the value is 7.6 v for the ha17385h. commercial ac voltage power switch line filter rectifier bridge diode dc output floating ground power mosfet ex. 2sk1567 sbd ex. hrp24 ovp input (ex: from photocoupler) 20k 3.6k 100 200v 1000 10v r t 10k v cs r b 220k 1/4w c b 10 50v v in 0.1 51 1k ? + b p s hrp32 vref v in out gnd comp fb ha17384h, ha17385h cs r t /c t + ? + ? + ? + ? r cs 1 2w 100p 150k 330p c t 3300p figure 2 mounting circut diagram for operation expression
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 13 of 28 v comp comp terminal (error output) pwm pulse latch setting pulse (implemented in triagular wave oscillator) latch setting pulse v comp error voltage v cs current sensing level r s q 1 v v cs cs terminal 2 r r 2v f 1 3 ? + cs cs latch figure 3 operation diagram of current sensing part point: current sense comparator threshold voltage v cs (v) error amplifier output voltage vcomp (v) light load heavy load 1) at maximum rated load, the setting should be made to give approximately 90% of area a below. 2) when the ovp latch is operated, the setting should be made in area b or c. 1.0 0.8 0.6 0.4 0.2 0.0 012345678 b a c 1.4v 4.4v 7.5v a : stationary operation / pwm (current-mode operation) b : current limit operation / max duty cycle c : no sensitivity area / no pwm output figure 4 current sense characteristics
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 14 of 28 features and theory of current mode control features of current mode control ? switch element current detection is performed every cycle, giving a high feedback response speed. ? operation with a constant transforme r winding current gives a highly stable output voltage (with excellent line regulation characteristic s, in particular). ? suitable for flyback transformer use. ? external synchronous operation is easily achieved. (this feat ure, for example, is applicable to synchronization with a forizontal synchronizing signal of crt monitor.) theory of current mode control in current mode control, a pwm pulse is generated not by comparing an error voltage with a triangular wave voltage in the voltage mode, but by changing the current limiter level in accordance with the error volta ge (comp terminal in this ic, that is,output of the error amplifier output) which is obtai ned by constantly monitoring the current of the switching device (power mos fet) using source resistor r cs . one of the features of current mode control is that the current limited operates in all cycles of pwm as described by the above theory. in voltage mode, only one feedback loop is made by an output voltage. in current mode, on the other hand, two loops are used. one is an output voltage loop and the other is a loop of the switching device current itself. the current of the switching device can be controlled switch high speed. in current mode control, the current in the transformer winding is kept constant, resulting in high stability. an important consequence is that the line regulation in terms of total characteristics is better than that in voltage mode. transformar ac input current sense comparator error amplifier dc output rs 2r r r s i s v comp vref osc + ? ? + flip flop figure 5 block diagram of current mode switching power spply
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 15 of 28 a . control in the case of heavy load b. control in the case of light load v cs i s v cs i s a s the load becomes heavy and the dc output decreases, the current sensing level is raised as shown in a. above in order to increase the current in the switching device in each cycle. when the load decreases, inverse control is carried out as shown in b. above. figure 6 primary current control of transformer in current mode (conceptual diagram)
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 16 of 28 main characteristics operating current i in (ma) operating current i in (ma) operating current i in (ma) power supply voltage v in (v) ambient temperature ta (c) operating current vs. ambient temperature standby current/latch current vs. supply voltage exploded diagram of the small current part from the above figure (ha17384s/h) power supply voltage v in (v) standby current/latch current vs. supply voltage exploded diagram of the small current part from the above figure (ha17385h) power supply voltage v in (v) power supply voltage v in (v) ambient temperature ta (c) 20 15 10 5 0 010203040 2.0 1.5 1.0 0.5 0 12 11 10 9 8 ta = 25c ta = 25c fosc = 52khz c t = 3300pf r t = 10k? ta = 25 c fosc = 52khz c t = 3300pf r t = 10k? 20 15 10 5 0 0102030 40 ta = 25c 0102030 40 2.0 1.5 1.0 0.5 0 010203040 400 300 200 100 0 supply current vs. supply voltage (ha17384s/h) supply current vs. supply voltage (ha17385h) operating current i in (ma) operating current i in (ma) standby ? latch current (a) standby current/latch current vs. ambient temperature latch current (ha17384h) latch current (ha17384h) latch current stanby current ?20 10580 60 40 20 0 ?20 10580 60 40 200 v in = 15v fosc = 52khz c t = 3300pf r t = 10k? latch current v in = 15v (ha17384h) v in = 8.5v (ha17385h) latch current
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 17 of 28 ambient temperature ta (c) ambient temperature ta ( c) ambient temperature ta ( c) supply voltage v in (v) output current of vref terminal (ma) r t /c t terminal voltage v ct (v) uvl threshold voltage vs. ambient temperature line regulation characteristics of reference voltage load regulation characteristics of reference voltage reference voltage vs. ambient temperature c t discharge current vs. r t /c t terminal voltage c t discharge current vs. ambient temperature uvl voltage (v) reference voltage vref (v) reference voltage vref (v) reference voltage vref (v) c t discharge current i ct (ma) 20 5.2 5.1 5.0 4.9 4.8 6.0 5.5 5.0 4.5 4.0 0 20 40 8060 100 ta = 25c v in = 15v c t = 3300pf r t = 10k? 9.5 9.0 8.5 8.0 7.5 0 1 2 3 15 10 5 0 5.2 5.1 5.0 4.9 4.8 ta = 25c v in = 15v 4 9.5 9.0 8.5 8.0 7.5 c t discharge current isink ct (ma) 0 10 20 30 v tl v th ?20 85 6040 20 0 ?20 105 60 80 40 20 0 ?20 105 60 80 40 20 0 ha17385h v th ha17384s/h v tl c t = 3300pf r t = 10k? c t = 3300pf r t = 10k? v in = 15v v in =15 v ta = 25c v in = 10v or more (ha17384s/h) v in = 7.6v or more (ha17385h) vref short protection operates measured when r t /c t terminal voltage is externally supplied minimum voltage of triangular wave maximum voltage of triangular wave measured when r t /c t terminal voltage of 2 v is externally supplied
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 18 of 28 oscillation frequency fosc (khz) timing resistance r t (?) 500 200 100 50 20 10 5 500 1k 2k 5k 10k 20k 50k 100k 200k ta = 25c v in = 15v 2200pf 4700pf 0.01f 0.022f 0.047f 1000pf c t =470pf figure 7 scillation frequency vs. timing resistance triangular wave pwm maximum on pulse in the case of small c t and large r t (ex. c t = 3300pf, r t = 10k?) du max = 95% fosc = 52khz triangular wave pwm maximum on pulse in the case of large c t and small r t (ex. c t = 0.033f, r t = 680?) du max = 40% fosc = 52khz case 1. setting large maximum duty cycle. case 2. setting small maximum duty cycle. figure 8 relationship between triangular wave and maximum on duty of pwm pulse
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 19 of 28 maximum on duty du max (%) timing resistance r t (?) note: in the oscillation system of this ic, a constant discharging current of 8.4ma flows the timing capacitor during triangular wave fall. therefore, note that a small maximum on duty (large dead band) leads to a large supply current. refer to the equations of oscillation frequency and supply current for details. 100 75 50 25 0 500 1k 2k 5k 10k 20k 50k 100k 200k ta = 25c v in = 15v figure 9 pwm pulse on duty vs. timing resistance
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 20 of 28 oscillation frequency fosc (khz) ambient temperature ta (c) ambient temperature ta (c) ambient temperature ta (c) operating current i in (ma) maximum on duty du max (%) output load capacitance c l (pf) oscillation frequency vs. ambient temperature operating current vs. maximum on duty rise/fall time of output pulse vs. load capacitance rise/fall time of output pulse vs. ambient temperature rise/fall time (ns) rise/fall time (ns) current sensing level v cs (v) v in (uvl1) vref (uvl2) pwm output condition description l l l l h l h h l standby state ic is in the on state and output is fixed to lo. available to output current sensing level vs. amb ient temperature relationship between low voltage malfunction protection and pwm output operation state standby state h l 65 25 0 25 50 75 100 v in = 15v fosc=50khz fosc=300khz v cs = 0v v fb = 0v 250 0 1000 2000 3000 fall time tf 60 55 50 45 40 20 15 10 5 0 200 150 100 50 0 v in = 15v v cs = 0v v fb = 0v ta = 25c c t = 3300pf r t = 10k? 4000 250 200 150 100 50 0 1.25 1.00 0.75 0.50 0.25 0 v in = 15v c l = 1000pf c t = 3300pf r t = 10k? dumax = 95% v in = 15v v cs = 0v v fb = 0v c t = 3300pf r t = 10k? v in = 15v v fb = 0v rise time tr c l = 1000pf ?20 105 60 80 40 20 0 ?20 105 60 80 40 20 0 ?20 105 60 80 40 20 0 c t = 0.033f r t = 680? dumax = 40% ta=25 c c l = 1000pf rise time t r fall time t f measured when comp terminal voltage is externally supplied
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 21 of 28 gain a vo (db) error amplifier input signal frequency f (hz) gain a vo 100 75 50 25 0 ?25 phase (deg) 0 60 120 180 10 100 1k 10k 100k 1m 10m phase v in = 15v, ta = 25c o = 60 typ phase margin at f t unit gain frequency f t = 1mhz typ figure 10 open loop gain characterisrics of error amplifier
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 22 of 28 triangular wave pwm maximum on pulse dumax is the ratio of maximum on time of pwm to one cycle time. in the above case, dumax = 95% ? calculation of operation parameters 1. maximum on duty du max (refer to the right figure.) du max = 1 1 + 1.78 in 1 + 190? r t ? 440? ( ) r t = + 440? 190? 0.56 (1/du max ? 1) c t = 1.78 du max fosc r t id max = v thcs fosc = 1 c t r t 0.56 + in 1 + 190? () {} 2. oscillation frequency fosc from the above two equations, the following two equations are obtained. 3. equalization to device r t from du max e (e = 2.71828.base of natural logarithm) 4. equation to device c t from fosc and r t 5. operating current i in i in = i q + isink ct (1 ? du max) + ciss v in fosc providing that i q = 8.4ma typ (supply current when oscillation in ic stops.) ciss is the input gate capacitance of the power mosfet which is connected and v in is the supply voltage of the ic. note that the actual value may differ from the calculated one because of the internal delay in operation and input characteristics of the power mos fet. check the value when mounting. additionally a small dumax leads to a large supply current, even if the frequency is not changed, and start up may become difficult. in such a case, the following measure is recommended. example 1: calculation when r t = 10k? and c t = 3300pf fosc = 52khz, du max = 95%, i in = 9.7ma example 2: calculation for 50% of du max and 200 khz of fosc r t = 693?, c t = 6360pf, i in = 12.5ma (1) for an ac/dc converter, a small bleeder resistance is required. (2) the large capacitance between vref and gnd is required. (3) use a large dumax with a triangular wave and raise the current limit of the switching device to around the maximum value (1.0v typ). the current limit is expressed as r t ? 440? however, ciss = 1000pf, v in = 18v r cs ? 1 figure 11 calculation of operation parameters
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 23 of 28 application circuit example (1) notes: p snubber circuit example 51 470p 1kv frd dfg1c8 1. : primary gnd, : secondary gnd. 2. check the wiring direction of the transformer coil. 3. insert a snubber circuit if necessary. 4. ovp function is not included in ha17384sps/srp. commercial ac 100v rectifier bridge diode line filter transformer specification example ei-22 type core (h7c18 06z) gap length lg = 0.3mm transformer coil example p: 0.5?80t/570h s: 0.5?16t bifiler/22 h b: 0.2?44t/170h s (opetation theory) because this circuit is a flyback type, the voltages in the primary (p), secondary (s) coils of the transformer and backup (b) coil are proportional to each other. using this, the output voltage of the backup coil (v in of ic) is controlled at constant 16.4v. (the voltage of the point divided by resistors of 20k? and 3.6k? is 2.5v). 20k 3.6k 100 200v 1000 10v r t 10k 220k 1/4w 10 50v v in 16.4v 0.1 51 1k 1k ? + b p s hrp32 dc 5v, 3a output vref v in out gnd comp fb ha17384h, ha17385h 2sk1567 sbd hrp24 cs r t /c t + ? + ? + ? + ? 1 2w 100p 150k 470p c t 3300p 141v 10k 2sa1029 ha17431 10k 47k the circuit for output current limiter figure 12 primary voltage sensing flyback converter
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 24 of 28 application circuit example (2) photocoupler (for output control) commercial ac 100v rectifier bridge diode when the error amplifier is used line filter transformer specification example ei-22 type core (h7c18 06z) gap length lg = 0.3mm transformer coil example p: 0.5?80t/570h s: 0.5?16t bifiler/22 h b: 0.2?44t/170h (operation theory) on the secondary side (s) of the flyback converter, error amplification is carried out by a shunt regulator and photocoupler. the voltage of the backup coil (b) is not monitored, which differs from the application example (1). in addition, ovp operates on the secondary side (s) using a photocoupler. refer to the application example (1) for the other notes. when the error amplifier is not used bleeder resistor (adjuster according to the rating of the photocoupler) 100 200v 1000 10v r t 10k 220k 1/4w 10 50v v in 16.4v 141v 0.1 51 1k 4.7k ? + b p s hrp32 dc 5v, 3a output vref v in out gnd comp fb ha17384h, ha17385h ha17431 2sk1567 sbd hrp24 cs r t /c t r t /c t + ? + ? + ? + ? 1.8k b 4.7k 1 2w 100p 150k 470p c t 3300p 330 3.3 3.3k + ? vref v in out gnd fb cs 0.8ma comp ovp input 1k 47k ha17431 2sa1029 10k 10k the circuit for output current limiter figure 13 secondary voltage sensing flyback converter
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 25 of 28 application examples for fuller expl oitation of power supply functions a number of application examples are briefly described below. 1. soft start a soft start is a start method in which the pwm pulse width is gradually increased when the power supply is activated. this prevents the stress on the transformer and switch element caused by a rapid increase in the pwm pulse width, and also prevents overshoot when the secondary-side output voltage rises. the circuit diagram is shown in figure 14. ? + ea i o 800a typ vref 5v (3v) (4.4v) (3.7v) (5v) 7v in d in v ref r cu c st d2 d1 2 2.5v ic internal circuit (around error amp.) external circuit (only partially shown) fb r 1v to power supply detection comparator (1v) comp 8 1 2r figure 14 circuit diagram for soft start operation: in this circuit, error amp output source current i o (800 a typ.) gradually raises the switch element current detection level, using a voltage sl ope that charges soft start capacitance c st . when the voltage at each node is at the value shown in parentheses in the figure, the soft start ends. the soft start time is thus given by the following formula: t st = (3.7 v/800 a) c st 4.62 c st (ms) (c st unit: f) external parts other than c st operate as follows: ? diode d1 : current detection level shift and current reverse-flow prevention. ? diode d2 : together with diode d in in the ic, c st charge drawing when power supply falls. ? resistance r cu : for c st charge-up at end of soft start. (use a high resistance of the order of several hundred k ?. ) note: during a soft start, since pwm pulses are not output for a while after the ic starts operating, th ere is a lack of energy during this time, and intermittent mode may be en tered. in this case, the capacitance between vref and gnd should be increased to around 4.7 f to 10 f.
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 26 of 28 notice for use ovp latch block ? case when dc power is applied directly as the power supply of the ha17384h, ha17385h, without using the transformer backup coil. also, when high-frequency noise is superimposed on the v in pin. ? problem the ic may not be turn on in the case of a circuit in which v in rises quickly (10 v/100 s or faster), such as that shown in figure 15. also, the ovp latch may operate even though the fb pin is normally at v ovp or below after the ic is activated. ? reason because of the ic circuit configuration, the timer latch block operates first. ? remedy (counter measure) take remedial action such as configuring a time constant circuit (r b , c b ) as shown in figure 16, to keep the v in rise speed below 10 v/100 s. also, if there is marked high-frequency noise on the v in pin, a noise cancellation capacitor (c n ) with the best possible high-frequency characteristics (such as a ceramic capacitor) should be inserted between the v in pin and gnd, and close to the v in pin. when configuring an ic power supply with an activation re sistance and backup winding, such as an ac/dc converter, the rise of v in will normally be around 1 v/100 s, and there is no risk of this pr oblem occurring, but careful attention must be paid to high-frequency noise. also, this phenomenon is not occuring to the ha17384s, because ovp fu nction is not built-in. output input v in v in gnd feedback ha17384 series figure 15 example of circuit with fast v in rise time
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 27 of 28 output input time constant circuit feedback ha17384 series v in v in 18v r b 51? c n c b 1f gnd + figure 16 sample remedial circuit externally synchronized operation ? case when, with a power supply using the ha17384s/h or ha17385h, externally synchronized operation is performed by applying an external syncronous signal to the r t /c t pin (pin 4). ? problem synchronized operation may not be possible if the amplitude of the external syncronous signal is too large. ? reason the r t /c t pin falls to a potential lower than the ground. ? remedy (counter measure) in this case, clamping is necessary using a diode with as small a v f value as possible, such as a schottky barrier diode, as shown in figure 17. vref 0.01f r t c t 47 ha17384 series external synchronous signal figure 17 sample remedial circuit
ha17384sps/srp, ha17384hps/hrp, ha17385hps/hrp rev.3.00 jun 15, 2005 page 28 of 28 package dimensions 7.62 dp-8b renesas code jeita package code previous code max nom min dimension in millimeters symbol reference 9.6 6.3 5.06 mass[typ.] 0.51g a z b d e a b c e l 1 1 p 3 e 0.5 0.58 1.3 0.20 0.25 0.35 2.29 2.54 2.79 0 15 prdp0008af-a p-dip8-6.3x9.6-2.54 10.6 7.4 0.38 0.48 1.27 2.54 1 p 1 3 14 85 0.89 c z e la a b b e d e 85 4 f *1 *2 *3 p mx y 1 e index mark d a z b h e 1 1 p terminal cross section c b b c 1 1 detail f a l l 0.75 0.10 1.27 5.80 6.20 0.42 0.34 p a 1 5.30 fp-8dc renesas code jeita package code previous code max nom min dimension in millimeters symbol reference 1.75 1.27 0.60 0.40 0.20 3.95 0.25 0.14 0.10 0.50 0.40 0.25 0.22 0.19 6.10 8 0 0.25 1.08 4.90 mass[typ.] 1 e 1 1 2 l z h y x c b a e d b c e e l a p-sop8-3.95x4.9-1.27 prsp0008dd-b 0.085g note) 1. dimensions"*1 (nom)"and" *2" do not include mold flash. 2. dimension"*3"does not include trim offset.
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