參數(shù)資料
型號(hào): SM8120AH
廠商: Seiko NPC Corporation
元件分類: LED驅(qū)動(dòng)器
英文描述: White LED Driver IC
中文描述: 白光LED驅(qū)動(dòng)IC
文件頁數(shù): 10/14頁
文件大?。?/td> 201K
代理商: SM8120AH
SM8120A
NIPPON PRECISION CIRCUITS INC.—10
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).
R1
250
SBD
Select signal 1
Tr1
R2
100
C
OUT
1.0
μ
F
L
22
μ
H
C
IN
4.7
μ
F
IN
V
LED
Select signal 2
Tr2
R3
40
VSS
FB
SW
VDD
CE
Select signal 2
Select signal 1
I
LED
Low
Low
2mA
Low
High
2 + 5 = 7mA
High
Low
2 + 12.5 = 14.5mA
High
High
2 + 5 + 12.5 = 19.5mA
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