MB3832A データシートの表示（PDF） - Fujitsu

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MB3832A

DC/DC Converter IC for Charging

Fujitsu 

MB3832A

2. Protection Functions

(1) Low input voltage malfunction preventive circuit (ULVO)

The transient state or a momentary decrease in supply voltage, which occurs when the power supply is turned

on, may cause errors in the control IC, resulting in breakdown or degradation of the system. The low input voltage

malfunction preventive circuit detects the internal reference voltage level according to the supply voltage and

turn off the external output transistor to make dead time 100%. The circuit restores voltage supply when the

supply voltage reaches its threshold voltage.

(2) Timer-latch short-circuit protection circuit (SCP Comp., SR Latch)

The latch circuit detects the output voltage levels of the error amplifiers. When the output voltage levels of the

two error amplifiers reach about 2.1 V at the same time, the timer circuit is actuated to start charging the external

capacitor connected to the CSCP terminal (pin 5). If the error amplifier outputs are not restored to the normal

voltage range before the capacitor voltage reaches about 0.7 V, the latch circuit is actuated to fix the output

terminals (OUT) at the “H” level. To reset the actuated protection circuit, turn the power supply on back.

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