FA5515P Просмотр технического описания (PDF) - Fuji Electric

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FA5515P

CMOS IC For Switching Power Supply Control

Fuji Electric 

6. Undervoltage lockout circuit (U.V.L.O.)

The IC incorporates a circuit that prevents the IC from

malfunctioning when the supply voltage drops. When the

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

Vcc=16.5V (typ). If the supply voltage drops, the output is shut

down when Vcc=9.0V (typ). When the undervoltage lockout

circuit operates, the outputs of the OUT and CS pins go low to

reset the IC.

7. Output circuit

The IC contains a push-pull output stage and can directly drive

the MOSFET. The absolute maximum rating of OUT pin peak

current is ±1.5A. But when using in actual circuit, the output

peak current depends on the characteristics of the MOSFET,

resistance between the OUT pin and the MOSFET, supply

voltage, temperature and so. When supply voltage is relatively

low or temperature is relatively high, the output peak current

may not reach the maximum ratings.

Note that the output current causes loss of the output stage.

The total loss caused by the operating current and the output

current should be within the ratings in actual circuit.

FA551X

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