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 (2 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
VIN 0.1 V
RSC
0.39 Ω
IS
IS COMP
+
-
L 33 uH
D31FU
TOKO
EXT
SB07-03C
SANYO
VOUT
COUT
2.2 uF
BAND GAP REFERENCE
OSC
0.86 V
CX 0.3 V
CLK
CLK
S
Q
R
ERROR
COMP
VREF
0.525 V
VLED
ILED
EN
8
ON/OFF
CX
7
GND
CX
100 pF
RLED
VFB
27 Ω
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 °C, unless otherwise specified.
LED Current and Efficiency Characteristics
VIN (V)
IIN (mA)
VLED (V)
ILED (mA)
EF LED (%)
2.7
71.3
7.01
18.81
68.6
3.0
62.9
7.01
18.85
70.0
L: D31FU, 33 mH
Toko Part Number: 888FU-330M
EF LED (%) = 100 * VLED * ILED / VIN * IIN
3.5
52.8
7.02
18.95
71.9
4.5
39.9
7.02
19.10
74.8
EF LED vs. VIN
100
80
60
40
20
00
2
4
6
VIN (V)
May 2001 TOKO, Inc.
ILED vs. VIN
20
18
16
14
12
10 0
2
4
6
VIN (V)
Page 7
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