FA5304AP 데이터 시트보기 (PDF) - Fuji Electric

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FA5304AP

Bipolar IC For Switching Power Supply Control

Fuji Electric 

The detection threshold is -0.17v for FA5305A with respect to

ground as shown in Figure 17.

The operation is similar to that of FA5304A except the

threshold is minus voltage compared to that which is plus

voltage for FA5304A.

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=16.0V.

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

VCC=8.7V. 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.

If IC operation stops when the undervoltage lockout circuit

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

MOSFET is shut down.

FA5304AP(S)/FA5305AP(S)

Fig. 17 Overcurrent limiting circuit for FA5305A

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 FA5305A

Fig. 19 Output circuit

9

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