LTC1872BES6 データシートの表示（PDF） - Linear Technology
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LTC1872BES6 Datasheet PDF : 12 Pages
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LTC1872B
APPLICATIONS INFORMATION
RITH
CITH
1
6
ITH/RUN NGATE
LTC1872B
2
5
GND
VIN
3
VFB
SENSE– 4
R2
R1
RS
+
0.1µF
CIN
VIN
L1
M1
D1
+
COUT
VOUT
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 6. LTC1872B Layout Diagram (See PC Board Layout Checklist)
1872B F06
TYPICAL APPLICATIO S
LTC1872B 3-Cell White LED Driver
VIN = 3 AA CELLS ≈ 2.7V TO 4.8V
AA
1
5
ITH/RUN VIN
10k
LTC1872B
AA
2
GND
SENSE– 4
220pF
3
VFB
6
NGATE
AA
R1
0.27Ω
L1
150µH
C1
10µF
10V
+ C2
M1 D0
15µF
35V
VOUT ≈ 28.8V
(WITH 8 LEDs)
C3
0.1µF
CERAMIC
15mA
D1
D2
1 TO 8
WHITE
•
LEDs
•
•
D8
C1: TAIYO YUDEN CERAMIC EMK325BJ106MNT
C2: AVX TPSD156M035R0300
D0: MOTOROLA MBR0540
D1-D7: CMD333UWC
L1: COILCRAFT DO1608C-154
M1: Si9804
R1: DALE 0.25W
53.6Ω
1872B TA04
10
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