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SP6121 Datasheet(PDF) 32 Page - Sipex Corporation

Part # SP6121
Description  Low Voltage, Synchronous Step Down PWM Controller
PDF  42 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6121 Datasheet(HTML) 32 Page - Sipex Corporation

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Design Solution 20
Mar29-06
SP6121 Buck/Boost Circuit for LED Driver up to 1.5A
Copyright ©2006
Page 4 of 4
Sipex Corporation
4.7uH
R3
545 Ohm
C1
2.2uF
Rref
0.1 Ohm
U1 SP6121
1
2
7
6
5
4
3
8
Vcc
GND
NDRV
ISET
ISENSE
COMP
VFB
PDRV
D2
5.1V
C1 10uF
L1L2 (744870004)
Wurth Electronic
C2
1uF
D1
Luxeon
LMV321
1
3
4
+
-
OUT
Cout
100uF
L1
Vin 3.0V-5.0 V
R2 4K
4.7uH
Q1
FDS6375
R4
10K
VFB=1.25V
Gain=1+R2/R3
I LED=Vref /0.1Ohm
=150mV/0.1Ohm
R1
10Ohm
Vout
Vref
2
L2
C3
1uF
Cin
47uF
Q2
FDN337N
5
Figure 11. Application Schematic



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