MB3789 View Datasheet(PDF) - Fujitsu

Part Name

Description

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MB3789

Switching Regulator Controller

Fujitsu 

MB3789

(2) Low input voltage malfunction preventive circuit

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

level and, if the input voltage is low, turn off the output transistor and maintains the SCP pin (pin 5) at 0 V while

making the dead time 100%.

The circuit restores voltage supply when the supply voltage reaches its threshold voltage.

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