LA5683T

No.8214-11/12

Sample Circuit That Makes Use of VBIAS (2)

This IC can be used to implement the circuit that is shown below since the power to the channels 3 and 4 output stages

is supplied via VBIAS.

Apply the power voltage to VBIAS through the path that is made up of VCC, L to Schottky diode (through path formation).

Then feed the stabilized voltage VO3 that is raised to 3.3V in channel 3 to VBIAS.

A voltage of approx. VBIAS3-1 volt develops at VOUT3, so that the IC can drive MOS transistors in a low-voltage

environment like this sample circuit.

Using the IC in a Step-down Circuit (CH1 and CH2)

The IC detects a short-circuit condition and activates the SCP when VCC falls below the preset voltage VO+VF in such

a step-down application as the one shown below.

to IN3−

VO3=3.3V

VCC

VBIAS Circuit Example 2

VBIAS

OUT3

SW

VOUT3

MCH3409

L

Schottky barrier diode

Fed to VBIAS

When stepping down VCC<V0+VF

VCC

VO1

VO1

IN+

OUT

VCC

VCC

VF

VF (diode forward voltage)

1.8V

SCP activated