FA551 Datasheet, PDF (13/22 Pages) List of Unclassifed Manufacturers – CMOS IC For Switching Power Supply Control

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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