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LA5759

Separately-excited Step-down Switching Regulator (Variable Type)

ON Semiconductor 

Block Diagram

LA5759

VIN 1

Constnt

Current

Circuit

Reg.

OSC

OCP

RESET

DRIVE

2 SWOUT

ON/OFF Comp.

0.4V

Comp.

TSD

Amp.

VREF

4 VOS

5

SS

Application Circuit Example

VIN

3

GND

L1

SWOUT

LA5759

C1

D1

C2

SS

GND

C3

VOS

R2

R1

Notes: C3 is for the soft start function. Delete C3 and keep the SS pin open when the soft function is not necessary.

Description of Functional Settings

1. Calculation equation to set the output voltage

This IC controls the switching output so that the VOS pin voltage becomes 1.26V (typ).

The equation to set the output voltage is as follows:

VO =

1+

R2

R1

× 1.26V(typ)

The VOS pin has the inrush current of 1μA (typ). Therefore, the error becomes larger when R1 and R2 resistance

values are large.

No.A1683-3/4

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