FA5540 Fuji Electric holdings CO.,Ltd, FA5540 Datasheet

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... Fuji Switching Power Supply Control IC FA5540/5541/5542 Application Note Rev.0 July-2007 FA5540/5541/5542 July 2007 Fuji Electric Device Technology Co., Ltd. Fuji Electric Device Technology 1 ...

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... Fuji Electric Device Technology Co.,Ltd. and its sales agents shall not be liable for any damage that is caused by a customer who does not follow the instructions in this cautionary statement. Rev.0 July-2007 FA5540/5541/5542 Caution - Communication equipment (Terminal) - Home appliance - Communication equipment for trunk line - Various equipment for the safety ...

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... In using these components, a design with due consideration for these conditions shall be conducted. Rev.0 July-2007 FA5540/5541/5542 Contents ・・・・・・・・・・・・・・・・・ 4 ・ ...

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... Description FA5540/41/ quasi-resonant type switching power supply control IC possible to drive a power MOSFET directly. Low power consumption is achieved by using high-voltage CMOS process. Though small package with 8 pins, it has a lot of functions and enables to decrease external parts. Therefore it is possible to realize a small space and high cost-performance power supply. ...

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... Time out (5.6µs) 5V Reset Max. fsw Blanking 50uA IS （３） 5V Disable 0.34V 1/2 FB （２） 1V Overload 3.3V Rev.0 July-2007 FA5540/5541/5542 Start up 1 shot management (380ns) CLR 12.4V/10.2V 60kHz 5V Reg. 5V Reg. Check Internal supply Current comparator S Q ZCD R OVP 2 7.2V ...

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... Overload 3.3V 5. Pin assignment Pin number Pin name 1 ZCD GND 5 OUT 6 VCC Rev.0 July-2007 FA5540/5541/5542 Start up 1 shot management (380ns) CLR 12.4V/10.2V 120kHz 5V Reg. 5V Reg. Check Internal supply Current comparator S Q ZCD R OVP 2 7.2V Soft start (1ms) Timer ...

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... Maximum junction temperature Storage temperature * Allowable loss reducing characteristics 400mW(SOP) 800mW(DIP) 0 -30 (2) Recommended operating conditions Item FA5540 Power supply voltage FA5541/42 VH pin input voltage VCC pin capacity Operating ambient temperature Rev.0 July-2007 FA5540/5541/5542 Symbo Rating -0. +0 -0.3 to VCC+0.3 OUT V -0 ...

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... Electrical characteristics ( in case nothing specified: Vcc=13V(FA5540) / 15V(FA5541/42), Tj=25℃) Current sensing part (IS pin) Item Input bias current Maximum input threshold voltage Voltage gain Minimum ON width Blanking time Output delay time Feedback part (FB pin) Item Pulse shutdown FB pin voltage FB pin input resistance FB pin current ...

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... Startup circuit shutdown V voltage Startup circuit reset V voltage Rev.0 July-2007 FA5540/5541/5542 Condition V OLP FA5540: Switching duration after detecting over load. FA5541: Switching duration T OLP after detecting over load. FA5542: Timer latch delay time after detecting over load. Switching FA5540 T shutdown time ...

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... Current consumption (VCC pin) Item Symbol Power supply current in operation Power supply current at latch Power supply zener voltage Rev.0 July-2007 FA5540/5541/5542 Condition fsw=60kHVF B=2.5V, FA5540 no load I CCOP1 fsw=120kHVF B=2.5V, FA5541/42 no load I CCL MIN TYP MAX Unit 1.1 mA 1.2 mA 200 400 µ Fuji Electric Device Technology ...

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... Characteristic curve ・ In case nothing is specified : Ta=25℃, VCC＝13V(FA5540) / VCC=15V(FA5541/42) ・ “+” shows sink and “–“ shows source in current prescription. ・ Data written here shows the typical characteristics of the IC and does not guarantee the characteristics. (FA5540) Maximum fsw blanking (Fmax) vs ...

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... OLP threshold voltage (Volp) vs. Junction temperature (Tj) FA5540 3.5 3.4 3.3 3.2 3.1 100 150 -50 0 vs. Junction temperature (Tj) FA5540 1400 1350 1300 1250 1200 100 150 -50 12 FA5540 0 50 100 150 Tj (degree) FA5540 50 100 150 Tj (degree) OLP OFF time(Toff) FA5540 0 50 100 150 Tj (degree) Fuji Electric Device Technology ...

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... IS pin maximum threshold voltage (VthIS) FA5540 1.2 1.0 Duty cycle =50% 0.8 0.6 0.4 0.2 0.0 100 150 0 ZCD pin OVP threshold voltage (Vovp2) vs. Junction temperature (Tj) FA5540 7.8 7.6 7.4 7.2 7.0 6.8 6.6 100 150 -50 13 FA5540 VCC (V) vs. FB pin voltage (VFB) FA5540 VFB (V) FA5540 0 50 100 150 Tj (degree) Fuji Electric Device Technology ...

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... Operating-state supply current (ICCOP1) FA5540 1.20 1.15 1.10 1.05 1. -50 14 vs. Junction Temperature(Tj) FA5540 0 50 100 Tj (degree) FB pin surce current (Ifb1) vs. Junction temperature (Tj) FA5540 0 50 100 Tj (degree) vs. Junction Temperature(Tj) FA5540 VFB=2.5V fsw=60kHz 0 50 100 Tj (degree) Fuji Electric Device Technology 150 150 150 ...

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... Junction temperature (Tj - (degree) UVLO ON threshold voltage (Vccon) vs. Junction temperature (Tj) 10.6 10.4 10.2 10.0 9.8 - (degree) Rev.0 July-2007 FA5540/5541/5542 FA5541/42 125 120 115 110 -50 ZCD pin input threshold voltage (Vthzcd2) FA5541/42 160 155 150 VZCD=decreasing 145 140 100 150 -50 ...

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... Tj (degree) Delay time to OLP (Tolp) vs. Junction temperature (Tj) 220 210 200 190 180 - (degree) Rev.0 July-2007 FA5540/5541/5542 Start-up circuit restart threshold voltage (Vstrst) vs. Junction temperature (Tj) FA5541/42 10.4 10.3 10.2 10.1 10.0 100 150 -50 OLP threshold voltage (Volp) vs. Junction temperature (Tj) FA5541/42 3.6 3.5 3.4 3.3 3 ...

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... IS pin maximum threshold voltage (VthIS) vs. Junction temperature (Tj) 1.10 1.05 1.00 0.95 0.90 - (degree) VCC pin OVP threshold voltage (Vovp1) vs. Junction temperature (Tj) 29.0 28.5 28.0 27.5 27.0 - (degree) Rev.0 July-2007 FA5540/5541/5542 Low output voltage (VOL) vs. Supply voltage (Vcc) FA5541/42 1.5 IOL=-100mA 1.3 1.1 0.9 0.7 0 pin maximum threshold voltage (VthIS) FA5541/42 1.2 1.0 Vfb=2.5V 0.8 0.6 0.4 0.2 0.0 100 ...

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... VVH (V) Operating-state supply current (ICCOP1) vs. VCC pin voltage (Vcc) 1.5 VFB=2.5V 1.4 Fsw=120kHz 1.3 1.2 1.1 1 Vcc (V) Rev.0 July-2007 FA5540/5541/5542 Charge current for VCC pin (Ipre0) FA5541/42 -6.0 -6.5 -7.0 -7.5 VVH=100V -8.0 -8.5 - FA5541/42 -180 Vcc=0V -184 -188 -192 -196 -200 300 400 ...

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... Switching loss of TURN ON can be controlled to the minimum by this operation. (Return to t1) After this, repeat from and continue switching. ZCD com parator Driver 1 shot F.F. Current com parator Rev.0 July-2007 FA5540/5541/5542 signal、set) and ZCD comparator Cd Q1 OUT Vds 5 R ZCD ZCD Valley ...

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... Heavy load Fig.3 Steady-state operation timing chart At each switching cycle, TURN ON is carried out at the first Valley signal that exceeds the time corresponding to the maximum frequency limit of 60kHz(FA5540)/120kHz(FA5541/42), counting from the previous TURN ON. Rev.0 July-2007 FA5540/5541/5542 60kHz(FA5540) 60kHz(FA5540) ...

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... FB pin voltage overshoots and undershoots centering around the pulse shutdown threshold voltage for mode change. Continuous pulse is output during the overshoot period and long period burst frequency is obtained during the undershoot period. Rev.0 July-2007 FA5540/5541/5542 Fig.4 Burst operation at light load 21 Fuji Electric Device Technology ...

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... On the other hand, in case that the auxiliary winding voltage is lower than 10.2V, the startup circuit continues to keep Vcc between 10.2V and 12.4V by switching ON-OFF of the startup circuit. Rev.0 July-2007 FA5540/5541/5542 Fuji Electric Device Technology 22 ...

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... If load returns to normal, IC returns to an ordinary operation. However, the output voltage must rise up to the setting value within 180ms settled by the timer at the startup. Rev.0 July-2007 FA5540/5541/5542 180ms 1440ms Over load Fig.7 Operation at overload (FA5540) 23 Normal load Fuji Electric Device Technology ...

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... When Vcc decreases to 9.0V once reset and restarted. Since then startup and shutdown are repeated if an overload condition continues. If load returns to normal, IC returns to an ordinary operation. However, the output voltage must rise up to the setting value within 200ms settled by the timer at the startup. Rev.0 July-2007 FA5540/5541/5542 200ms 1600ms Over load Fig ...

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... To reset an overload latch required to shutdown the provision of Vcc from the startup circuit by stopping the input voltage and reduce Vcc lower than OFF-threshold voltage 9.0V. However, the output voltage must rise up to the setting value within 200ms settled by the timer at the startup. Rev.0 July-2007 FA5540/5541/5542 200ms Over-load operation Fuji Electric Device Technology ...

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... Miscellaneous ・Vcc is always observed and if it exceeds 16V (FA5540) / 28V (FA5541/42 shutdown. This condition is maintained until Vcc drops to UVLO off-threshold voltage by interrupting its input voltage. ・ By pull-upping ZCD pin voltage higher than 7.2V from outside, shutdown is carried out like the case of the overload voltage and this condition is maintained. ・ ...

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... Pull up ZCD pin by an external signal. Fig. 14 shows the connection example in case of primary over-voltage. ・Operation When ZCD pin voltage exceeds 7.2V (typ.) and continues for more than 40µs (FA5540) / 54µs (FA5541/42) (typ.), latch protection operates. Once latch protection operates, IC output pulse is shutdown and maintained as it is. ...

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... FB pin voltage rises and scales out. This state is detected and judged as an overload condition. The threshold voltage to detect an overload is 3.3V (typ). ・Complement FA5540/41 operates intermittently in an overload condition and automatically restarts if the overload condition is removed. Refer to pages 23-24 for detail operation. FA5542 stops switching in an overload condition and goes into latch mode to maintain this condition ...

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... During the period MOSFET is ON, this pin is kept in high position and almost the same voltage as Vcc is output. During the period MOSFET is OFF, this pin is kept in low position and nearly zero voltage is output. Rev.0 July-2007 FA5540/5541/5542 Current Comparator Fig. 17 Filter of IS pin 6 VCC Driver ...

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... In addition this auxiliary winding can also be connected with ZCD pin. ・Operation The voltage provided by the auxiliary winding should be set 12V to 14.5V (FA5540) / 12V to 26V (FA5541/42) in ordinary operation possible to drive IC with the current provided by a startup circuit without using an auxiliary winding but standby power requirement becomes larger and heat dissipation increases ...

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... In addition, much attention is required in selecting MOSFET to drive, because there is a limit to the current to be provided when IC is driven only by a startup circuit. Rev.0 July-2007 FA5540/5541/5542 Starting circuit 起動回路 On/off signal on/off 信号 Fig.22 VH pin circuit (1) Starting circuit 起 ...

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... These application examples show common specification for FA5540/41/42. The same circuitry can be adapted for FA5540/41/42 except the setting of Vcc pin voltage and the transformer designing that depends on a switching frequency. (L value and winding ratio of the transformer for FA5541/42 are shown in the figure below) ...