Diodes AL8811 - Manual (Page 8)

AL8811
Document number: DS36090 Rev. 2 - 2
8 of 11
www.diodes.com
June 2013
© Diodes Incorporated
AL8811
Application Circuit
(cont.)
(3) Buck
Converter
Test Conditions Results
Line Regulation V
IN
= 12V to 20V, I
O
= 500mA 20mV = ±0.2%
Load Regulation V
IN
= 20V, I
O
= 50mA to 500mA 5mV = ±0.05%
Output Ripple V
IN
= 20V, I
O
= 500mA 160mV
PP
Efficiency V
IN
= 20V, I
O
= 500mA 82%
1.25V
Ref
Reg
I pk
C T
R
S Q
Q2
Q1
Comp.
+
_
8
7
6
5
1
2
3
4
V CC
Osc
+
470
uF
V in
20
R sc
0.11
R1 25k 36k
R2
+
C O
5.0V/500mA
V out
+
100
V out
Optional Filter
C T
470
pF
L 100uH
B240
470uF
1.0uH