White LED driver circuit
BL8508
LED
26
LED LED
LED
BL8508
900kHz
0.22uF
PCB
92mV
BL8508 SOT-23-5
:
BL8508
LED
• LED
• 80%
• 3V
4 ...
Description
BL8508
LED
26
LED LED
LED
BL8508
900kHz
0.22uF
PCB
92mV
BL8508 SOT-23-5
:
BL8508
LED
LED
80%
3V
4 LED
5V
6 LED
36V
2V
900kHz
SOT-23-5
PDA MP3
1 SW 2 GND 3 FB 4 CE 5 Vin
www.belling.com.cn
Ver1.0
1/10
BL8508
:
:
---------------------------------------------------------------------------------------- -10V SW ---------------------------------------------------------------------------------------- 36V FB ----------------------------------------------------------------------------------------- 10V CE ----------------------------------------------------------------------------------------- 10V
---------------------------------------------------------------------------------------- -40~+85°C ---------------------------------------------------------------------------------------- -40~125°C
------------------------------------------------------------------------------- 260°C,10S θJA ----------------------------------------------------------------------------------------- 256°C/W
:
2 6V
-40 25
70
C1 1 µF
C2
0.1 0.22
10
µF
L1
10 22 47
µH
www.belling.com.cn
Ver1.0
2/10
BL8508
: ( Topt 25 Vin=3V Vce=3V)
Vmin Vmax Vfb Iss Ioff Dmax Ilimit Fsw VCESAT ISWleak VCEH VCEL
SW
SW SW CE CE
CE=0
ISW=250mA VSW=5V SW off
C1=1µF C2=0.22µF L1=22uH MURATA LQH-220 D1 CENTRAL SEMICONDUCTOR CMDSH-3
2.0 82
85 0.8 0.95 1.5
:
92 0.7 0.1 90 320 0.9 1.05 0.5
V 10 V 102 mV 1.0 mA 1.0 uA
% mA 1.0 MHz 1.25 V 1 uA
V 0.8 V
:
SW Pin1 EM...
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