A5317P 查看數據表（PDF） - Fuji Electric

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A5317P

Bipolar IC For Switching Power Supply Control

Fuji Electric 

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 18 is a 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. When the

supply voltage is raised from 0V, the IC starts operation with

VCC=VCC ON.

If the supply voltage drops, the IC shuts its output down when

VCC=VCC OFF. When the undervoltage lockout circuit operates,

the CS pin goes low to reset the IC.

7. Output circuit

As shown in Figure 19, the IC's totem-pole output can directly

drive the MOSFET. The OUT pin can source and sink currents

of up to 1.5A or 1.0A.

If IC operation stops when the undervoltage lockout circuit

operates, the gate voltage of the MOSFET goes low and the

MOSFET is shut down.

FA531X series

Fig. 17 Overcurrent limiting circuit for FA5314/15

CS pin voltage (3.6V)

DT voltage

Oscillator output

FB pin voltage

OUT pin output H

L

Minus

detection

IS ( – ) pin voltage

Comparator C4

Reference

voltage (– 0.17V)

Bias voltage

OFF

Overcurrent limiting

Fig. 18 Overcurrent timing chart for FA5314/15

Fig. 19 Output circuit

8

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