HA16114 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HA16114

Switching Regulator for Chopper Type DC/DC Converter

Renesas Electronics 

HA16116FP/FPJ, HA16121FP/FPJ

5.2 Quick Shutoff

When the UVL circuit goes into operation, a sink transistor is switched on as in the figure below, drawing

off the excess current. This transistor also functions when the IC is turned off, drawing off current from the

CT, E/O, and DB pins and enabling quick shutoff.

PWM

output

On

PWM

output

off

PWM output on

PWM

output off

Off

1.7 2.0 2.5

5.0 7.0

When VIN is

low

Abnormal voltage

applied to Vref

Relation of Vref to UVL and OVP

VIN

Vref

Vref

generation

circuit

OVP

2.0 V and

Vref

1.7 V

detection

ZD

5.6 V

R

Internal

pulse

signal

line

UVL

OUT

Sink

10 kΩ

transistor

To other circuitry

Figure 5.1 Quick Shutoff

Vref (V)

OUT

Rev.2.0, Sep.18.2003, page 14 of 33

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