LA5756 查看數據表（PDF） - SANYO -> Panasonic
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LA5756 Datasheet PDF : 4 Pages
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Block Diagram
LA5756
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
LA5756
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.A1438-3/4
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