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
The following are 3 kinds of dimming methods.
DIMMING
1. Dimming by RLED
The current of the LED (ILED) is determined by RLED,which can be set by switches such as transistors.
Example of 3 LEDs with a 4 brightness level circuit:
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
ILED =
VREF
RLED
RLED: Total value of Resistors
VREF = 0.525 V (typ)
VFB Voltage = 0.525 V (typ)
COUT
VLED
ILED
RLED1
RLED2
RLED3
CONTROL
SIGNAL 1
SW1
CONTROL
SIGNAL 2
SW2
Page 10
ILED vs. RLED
RLED (9)
ILED (mA)
24
21.9
27
19.5
36
14.6
51
10.4
100
5.4
510
1.1
20
18
16
14
12
10
8
6
4
2
0 10
LED CURRENT (ILED) vs.
TOTAL RESISTANCE (RLED)
100
RLED (Ω)
1000
May 2001 TOKO, Inc.
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