APW7143 查看數據表（PDF） - Anpec Electronics
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APW7143 Datasheet PDF : 19 Pages
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APW7143
Block Diagram
VIN
FB
COMP
EN
Power-On-
Reset
Current
Limit
Current Sense
Amplifier
50%VREF
POR
UVP
Soft-Start
Soft-Start /
Soft-Stop
and
Fault Logic
VREF
Gm
Error
Amplifier
1.5V
Enable
Over
Temperature
Protection
Inhibit
Gate
Control
Current
Compartor
Slope
Compensation
Oscillator
FB
500kHz
UG
Gate
Driver
LX
AGND
Typical Application Circuits
1. +12V Single Power Input Step-down Converter (with an Electrolytic Output Capacitor)
2
VIN
Enable
6
Shutdown
EN
LX 8
U1 LX 7
APW7143
5 COMP
R3
62K
FB 4
C1
2.2µF
C5
470µF
L1
4.7µH /3A
D1
R1
46.9K
±1%
C3
680pF
AGND
R2
3
15K
±1%
C4
47pF
VIN
12V
VOUT
3.3V/3A
C2
470µF
(ESR=30mΩ)
Copyright © ANPEC Electronics Corp.
10
Rev. A.1 - Apr., 2008
www.anpec.com.tw
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