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
APPLICATION CIRCUIT (4 LEDs in Series)
• Input Voltage: 2.7 V
• LED Current: 20 mA
• On/Off: Pin Number 8 (EN Pin)
LED Current (ILED) is set by RLED.
ILED doesn’t depend on VIN because ILED
is controlled by the feedback circuit.
VIN
CIN
4.7 µF
GND
RSC
0.22 Ω
VIN 0.1 V
IS
IS COMP
+
-
L 15 uH
D52LC
TOKO
SB07-03C
SANYO
EXT
VOUT
BAND GAP REFERENCE
OSC
0.86 V
CX 0.3 V
CLK
CLK
S
Q
R
ERROR
COMP
VREF
0.525 V
EN
8
ON/OFF
CX
7
GND
VFB
CX
56 pF
RLED
27 Ω
COUT
2.2 uF
VLED
ILED
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, unless otherwise specified.
LED Current and Efficiency Characteristics
VIN (V)
2.5
IIN (mA)
144.4
VLED (V)
13.68
ILED (mA)
19.32
EF LED (%)
73.30
L: D52LC, 15 mH
Toko Part Number: A914BYNW - 150M
2.7
132.2
13.68
3.0
117.9
13.68
19.30
19.27
73.97
74.44
EF LED (%) = 100 * VLED * ILED / VIN * IIN
3.5
99.0
13.68
19.28
76.07
4.5
75.3
13.68
19.35
78.06
6.0
55.3
13.68
19.34
79.71
EF LED vs. VIN
100
80
60
40
20
00
2
4
6
8
VIN (V)
ILED vs. VIN
20
18
16
14
12
10 0
2
4
6
8
VIN (V)
May 2001 TOKO, Inc.
Page 9
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