TK11850 データシートの表示（PDF） - Toko America Inc
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TK11850 Datasheet PDF : 14 Pages
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TK11850L
DIMMING (CONT)
3. Dimming by DAC (D/A Converter) output
Dimming is achievable by applying a DAC output to the VFB terminal with the addition of RDAC1 and RDAC2.
VIN
CIN
GND
RSC
VIN 0.1 V
IS COMP
+
-
IS
L
EXT
D
VOUT
BAND GAP REFERENCE
OSC
0.86 V
Cx 0.3 V
CLK
CLK
CLK
S
Q
R
ERROR
COMP
VREF
0.525 V
EN
8
ON/OFF
CX
7
CX
GND
VFB
DAC OUTPUT
RDAC1
RDAC2
COUT
Example Conditions:
RDAC1 = RDAC2
RLED = 49 W
ILED vs. VDAC
DAC VOLTAGE (V) LED CURRENT (mA)
0.1
19.58
0.2
17.45
0.3
15.32
0.4
13.21
0.5
11.08
0.6
8.95
0.7
6.84
0.8
4.71
0.9
2.6
1
0.5
VLED
ILED
RLED 1
LED CURRENT (ILED) vs.
DAC VOLTAGE (VDAC)
20
18
16
14
12
10
8
6
4
2
00
0.2 0.4
0.6 0.8
1
VDAC (V)
May 2001 TOKO, Inc.
Page 13
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