LA5683T 查看數據表（PDF） - SANYO -> Panasonic

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LA5683T

4ch Switching Regulator Control IC

SANYO -> Panasonic 

Sample Circuit That Makes Use of VBIAS (2)

LA5683T

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.

VBIAS

Fed to VBIAS

Schottky barrier diode

VCC

L

OUT3

VO3=3.3V

SW

VOUT3

MCH3409

to IN3−

VBIAS Circuit Example 2

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.

VCC

OUT

VF (diode forward voltage)

VO1

VO1

VF

IN+

VCC

SCP activated

1.8V

VCC

When stepping down VCC<V0+VF

No.8214-11/12

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