FA5310 Fuji Electric holdings CO.,Ltd, FA5310 Datasheet
FA5310
Available stocks
Related parts for FA5310
FA5310 Summary of contents
Page 1
... FA531X series FA531X series FA5310BP(S), FA5314P(S), FA5316P(S) FA5311BP(S), FA5315P(S), FA5317P(S) Description The FA531X series are bipolar ICs for switching power supply control that can drive a power MOSFET. These ICs contain many functions in a small 8-pin package. With these ICs, a high-performance and compact power supply can be created because not many external discrete components are needed ...
Page 2
... T 1 1.5 FA5310/14/16 FA5311/15/17 Min. Typ. Max. Min. Typ. Max. –660 –800 –960 –660 –800 –960 0.75 0.75 1.80 2.30 MAX FA5310/14/16 FA5311/15/17 Min. Typ. Max. Min. Typ. Max. –15 –10 –5 –15 –10 –5 0.90 0.90 1.90 2.30 MAX Unit ...
Page 3
... IS T 150 PD IS Symbol Test condition I Pin 8=6V, Pin 2=1V SINK Symbol Test condition Symbol Test condition FA5310/11 Min. Typ. V 15.5 16 8.20 8.70 CC OFF Symbol Test condition FA5310/11/14/15 FA5316/ =100mA =50mA =–100mA =–50mA =18V =18V load No load tf No load No load Symbol ...
Page 4
Description of each circuit 1. Oscillator (See block diagram) The oscillator generates a triangular waveform by charging and discharging a capacitor. CT pin voltage oscillates between an upper limit of approx. 3.0V and a lower limit of approx. 1.0V. The ...
Page 5
... Figure 6. The CS pin is connected to an input of the PWM comparator. The device is in soft-start mode while the CS pin voltage is between 0.9V and 1.9V (FA5310/14/16) and between 0.9V and 2.3V(FA5311/15/17). During normal operation, the CS pin is clamped at 3.6V by internal zener diode Zn. If the output voltage drops due to an overload, etc ...
Page 6
Overload shutdown Figure 9 shows the overload shutdown circuit, and Figure timing chart which illustrates overload shutdown operation. If the output voltage drops due to an overload or short-circuit, the output voltage of the FB pin ...
Page 7
... RC filter between the IS pin and the MOSFET. Figure timing chart which illustrates current-limiting operations. Fig. 15 Overcurrent limiting circuit for FA5310/11/16/17 7 Fig. 13 External output on/off control circuit Fig. 14 Timing chart for external output on/off control Fig. 16 Overcurrent timing chart for FA5310/11/16/17 ...
Page 8
... The detection threshold is -0.17V for FA5314/15 with respect to ground as shown in Figure 17. The operation is similar to that of FA5310B/11B/16/17 except the threshold is minus voltage compared to that which is plus voltage for FA5310B/11B/16/17. Figure timing chart which illustrates current limiting operations. 6. Undervoltage lockout circuit The IC incorporates a circuit which prevents the IC from malfunctioning when the supply voltage drops ...
Page 9
FA531X series Design advice 1. Startup circuit It is necessary to start-up IC that the voltage inclination of VCC terminal “dVcc/dt” satisfies the following equation(4). dVcc/dt(V/s)>1.8/Cs( F)...............................( Capacitor connected between CS terminal and GND Note that equation (4) ...
Page 10
Startup circuit connected to rectified line This method is not suitable for FA531X, especially concerned with re-startup operation just after power-off or startup which AC input voltage goes up slowly. Fig. 21 shows a startup circuit that a startup ...
Page 11
... Fig. 24 Disabling overload shutdown function Fig. 25 Independent setting of soft-start period . and OFF latch delay L and CC Fig. 26 Vcc line and ground line (1) for FA5310B/11B/16/17 Fig. 27 Vcc line and ground line (2) for FA5314/15 CS VCC Fig. 28 Setting sink current for CS terminal 7.5k 18V Zener diode Under 500 A ...
Page 12
Characteristic curves (Ta=25 C) Oscillation frequency (f ) vs. OSC timing capacitor capacitance ( Output duty cycle vs. FB terminal voltage (V Output duty cycle vs. CS terminal voltage (V Oscillation frequency (f ) Output duty cycle vs. ...
Page 13
... FA531X series H-level output voltage (V ) vs. output source current (I OH FA5310/11/14/15 L-level output voltage(V ) vs. output sink current (I OL FA5310/11/14/15 IS (+) terminal threshold voltage (V ambient temperature (Ta) FA5310/11/16/ SOURCE FA5316/ SINK FA5316/ vs. IS (–) terminal threshold voltage (V TH IS(+) ambient temperature (Ta) FA5314/15 –190 –180 –170 – ...
Page 14
... CC Ordinary operation FA5310/11 11 fosc=600kHz 0.2 0 [V] CC Supply current (I ) vs. supply voltage (V CC OFF or OFF latch mode FA5310/11 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0 (-) terminal current (I IS (-) terminal voltage (I FA5314/15 –200 –180 –160 –140 –120 – ...
Page 15
... FA531X series Application circuit Example of FA5310B application circuit Example of FA5311B application circuit 15 ...
Page 16
Example of FA5314 application circuit Example of FA5315 application circuit FA531X series 16 ...
Page 17
FA531X series Example of FA5316 application circuit Example of FA5317 application circuit Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics ...