SC4503 Semtech Corporation, SC4503 Datasheet - Page 15

• Manufacturer Part Number: SC4503
• Description: 1.3MHz Step-Up Switching Regulator
• Manufacturer: Semtech Corporation

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 2007 Semtech Corp.
POWER MANAGEMENT
Typical Application Circuits
Figure 9.
Driving Two 6 White LED Strings from 5V. Zener diode D
from over-voltage damage when both LED strings become open.
5V
C1
4.7µF
R3
54.9k
C3
56nF
4
L1: Murata LQH32C
C1: Murata GRM219R60J475K
SHDN/SS
IN
5
SC4503
10µH
GND
L1
2
1
SW
FB
ZHCS400
3
15
D1
24V
+
_
C5
22nF
D2
MM5Z24VT1
220pF
301k
C4
R4
R1
63.4
2
protects the converter
R2
63.4
C2
0.22µF
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SC4503