APL1581
Application Circuit
(1) Adjustable Output Voltage Device
V
IN
+3.3V
VIN
VOUT
APL1581
(Adj.)
V
OUT
+2.5V/5A
V
CNT L
+5V
C
CNTL
10uF
VCNTL
VSENSE
ADJ
V
REF
R1
120
C
OUT
470uF
C
IN
100uF
R2
120
GND
GND
* V
OUT
= V
REF
( 1+ R2 / R1 ) + I
ADJ
* R2
where V
REF
=1.25V (typical)
I
ADJ
=50
µ
A (typical)
* R1 is typically in range of 100Ω to 125Ω to satisfy the minimum load current requirement.
(2) Fixed Output Voltage Device
V
IN
+3.3V
VIN
VOUT
APL1581-25
V
OUT
+2.5V/5A
V
CNT L
+5V
C
CNTL
10uF
VCNTL
VSENSE
GND
C
OUT
470uF
C
IN
100uF
GND
GND
(3) With Enable Control Application
V
IN
+3.3V
Q1
VIN
VOUT
APL1581
(Adj.)
V
OUT
+2.5V/5A
V
CNT L
+5V
VCNTL
10k
Q2
10k
C
CNTL
10uF
C
IN
100uF
VSENSE
ADJ
V
REF
R1
120
C
OUT
470uF
Enable
R2
120
GND
Q1 : APM2301A
Q2 : APM2300A
GND
Copyright
©
ANPEC Electronics Corp.
Rev. B.5 - Mar., 2008
5
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
