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RT8474A Datasheet(PDF) 7 Page - Richtek Technology Corporation

Part No. RT8474A
Description  High Voltage Multiple-Topology LED Driver
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8474A Datasheet(HTML) 7 Page - Richtek Technology Corporation

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RT8474A
7
DS8474A-05 April 2015
www.richtek.com
©
Copyright
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Buck-Boost Configuration
RT8474A
ISN
VCC
VIN
1
CREG
VC
R3
10k
5
8
GND
SW
ISP
Analog Dimming
or PWM Dimming
CTL
6
2
7
3
9 (Exposed Pad)
C5
C2
C1
3.3nF
1µF
D1
C3
1µF
R2
10
10µF
L1
22µH
C4
1µF
R1
0.1
VLED
51R
VZ > VLED
20R
VZ
Note :
1. VSW < 50V, VIN + VLED < 50V
2. VLED : the voltage across the LED string
3. Vz : Zener diode breakdown voltage
OVP 4


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