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SM8120A データシートの表示(PDF) - Nippon Precision Circuits
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SM8120A
White LED Driver IC
Nippon Precision Circuits
SM8120A Datasheet PDF : 14 Pages
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SM8120A
Current Switching using External Transistors
If only a few brightness steps are required, the LED current can be adjusted by switching the LED current set-
ting resistance using external transistors (Tr).
V
IN
3.6V
L
22
µ
H
C
IN
4.7
µ
F
SBD
SW
VDD
VSS
FB
CE
C
OUT
1.0
µ
F
LED
Select signal 1
Select signal 2
R3
40
Ω
Tr2
R2
100
Ω
Tr1
R1
250
Ω
Select signal 2
Low
Low
High
High
Select signal 1
Low
High
Low
High
I
LED
2mA
2 + 5 = 7mA
2 + 12.5 = 14.5mA
2 + 5 + 12.5 = 19.5mA
NIPPON PRECISION CIRCUITS INC.—10
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