参数资料
型号: LM5757TP
元件分类: 稳压器
英文描述: 1.5 A SWITCHING REGULATOR, 360 kHz SWITCHING FREQ-MAX, ZFM5
文件页数: 3/6页
文件大小: 72K
代理商: LM5757TP
LA5757TP
No.A0951-3/5
Block Diagram
2SWOUT
DRIVE
OCP
RESET
OSC
Comp.
Reg.
Amp.
TSD
2VOS
VREF
0.4V
ON/OFF Comp.
1
VIN
5
SS
3
GND
Constnt
Current
Circuit
Application Circuit Example
VIN
SWOUT
VOS
GND
SS
L1
C1
C2
D1
LA5757TP
C3
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 1.255V (typ).
The equation to set the output voltage is as follows:
VO = 1+
× 1.255V(typ)
R2
R1
The VOS pin has the inrush current of 1A (typ). Therefore, the error becomes larger when R1 and R2 resistance
values are large.
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