Datasheet
150KHz 40V 3A开关电流自带恒流环路降压型DC-DC转换器
XL4201
典型系统应用(VIN=8V~40V, IOUT=660mA)
ILED=0.11V/RCS
LED OVP=1.3*VOUT=1.3*{1.25*(1+R2/R1)}
L1 100uH/3A
VIN
SW
8
2
R2
60K
1%
D1
B540C
XL4201
CC
C2
COUT
105
105
220uF/35V
VIN
8V~40V
VC
FB
7
4
3
5
CIN
C1
R1
3K
1%
GND
CS
100uF/50V 105
RCS
0.165Ω
1%
图 13. XL4201 系统参数测量电路(VIN=8V~40V,IOUT=660mA)
Efficiency VS LED String
100
95
90
85
80
75
VIN=8V,IOUT=660mA
VIN=12V,IOUT=660mA
VIN=24V,IOUT=660mA
VIN=36V,IOUT=660mA
70
65
60
55
50
45
40
1
2
3
4
5
6
LED String(N*2W)
图14. XL4201系统效率曲线
Rev 1.0
www.xlsemi.com
10