NJW4800
ꢁUnder Voltage Lockout(UVLO)
The UVLO circuit operating is released above V+=6.6V(typ.) and IC operation starts. When power supply voltage is low,
because the UVLO circuit operates, IC does not operate. There is 0.25V width hysteresis voltage at rise and decay of
power supply voltage. Hysteresis prevents the malfunction at the time of UVLO operating and releasing.
ꢁFAULT Signal Output
This Terminal is Open Drain Output Type. You should connect through Pull-up Resister to REG Terminal (7-pin) or
External Power Supply. It outputs Low Level under normal operating condition and outputs High Level under Abnormal
Conditions.
The following information is output as FAULT signal.
・Stop Operation at Under Voltage Lockout (UVLO)
・Over Current Protection Function
・Thermal Shut Down
At the time of standby state, it outputs High Level.
When outputting the FAULT signal, it has stopped SW operation, but the internal regulator continues operation.
Because of this 30mA it is flowing via the OUT terminal from the regulator circuit.
ꢁStandby Function
NJW4800 stops the operating and becomes standby status when 2.4V or more is supplied to STBY terminal.
You should connect the terminal with GND level to prevent the malfunction by a noise when you do not use this function.
Ver.2010-09-29
- 14 -
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