APL5912
Operating Waveforms
Test Circuit
R4
C2
1uF
5
2.2
L1
1uH
+5V
R8
8.2k
C8
470pF
7
VCC
BOOT
OCSET
2
8
1
D1
1N4148
C3
1uF
C4
470uFx2
C9
47uF
C
VCNTL
1uF
V
C N T L
+5V
POK
6
Q3
UGATE
PHASE
C6
0.1uF
Q1
A P M 2 0 1 4 N L2
3.3uH
V
IN
+1.5V
C5
1000uFx2
VCNTL
5
Shutdown
VIN
POK
VOUT
7
R3
1k
U2
APW7057
6
FB
GND
4
LGATE
Q2
APM2014N
C
IN
100uF
3
4
V
OUT
+ 1 . 2 V 5A
/
C
OUT
220uF
R5
1.75k
EN
8
U1
APL5912
EN
GND
1
VOUT
FB
2
1. Load transient Response
1.1
Using an Output Capacitor with ESR
≥
18m
Ω
- C
OUT
= 220
µ
F/6.3V (ESR = 30m
Ω
), C
IN
= 100
µ
F/6.3V
- I
OUT
= 10mA to 5A to 10mA, Rise time = Fall time = 1
µ
S
I
OUT
= 10mA -> 5A
3
Enable
R2
2k
R1
1k
C1
33nF
R7
2k
C7
0.1uF
R6
0
I
OUT
= 10mA -> 5A ->10mA
R1=1kΩ, R2=2kΩ, C1=33nF
I
OUT
= 5A -> 10mA
1
V
OUT
1
V
OUT
1
V
OUT
I
OUT
I
OUT
I
OUT
2
2
2
Ch1 : V
OUT
, 50mV/Div
Time : 2
µ
S/Div
Ch2 : I
OUT
, 2A/Div
Ch1 : V
OUT
, 50mV/Div
Ch2 : I
OUT
, 2A/Div
Time : 20
µ
S/Div
Ch1 : V
OUT
, 50mV/Div
Ch2 : I
OUT
, 2A/Div
Time : 2
µ
S/Div
Copyright
©
ANPEC Electronics Corp.
Rev. A.6 - Jun., 2005
8
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
