TK11850LTL TOKO [TOKO, Inc], TK11850LTL Datasheet - Page 9

• Manufacturer Part Number: TK11850LTL
• Description: WHITE LED DRIVER
• Manufacturer: TOKO [TOKO, Inc]

May 2001 TOKO, Inc.
V
N I
2
2
3
3
4
6
5 .
7 .
0 .
5 .
5 .
0 .
(
•
•
•
) V
Input Voltage: 2.7 V
LED Current: 20 mA
On/Off: Pin Number 8 (EN Pin)
LED Current (I
I
is controlled by the feedback circuit.
LED
100
60
40
80
20
doesn’t depend on V
0
0
I
LED Current and Efficiency Characteristics
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
N I
1
1
1
9
7
5
4
3
1
(
9
5
5
m
4
2
7
0 .
3 .
3 .
4 .
9 .
2 .
) A
2
EF LED vs. V IN
LED
APPLICATION CIRCUIT (4 LEDs in Series)
) is set by R
V IN (V)
V
4
1
1
1
1
1
1
L
E
3
3
3
3
3
3
D
6 .
6 .
6 .
6 .
6 .
6 .
(
) V
8
8
8
8
8
8
IN
because I
6
T
LED
A
= 25 °C, unless otherwise specified.
.
I
L
E
8
1
1
1
1
1
1
D
9
9
9
9
9
9
LED
(
3 .
2 .
2 .
3 .
3 .
3 .
m
7
4
2
0
8
5
) A
4.7 F
GND
V IN
C IN
SB07-03C
SANYO
E
F
7
7
7
7
7
7
L
3
3
4
6
8
L 15 uH
9
0.22
D52LC
E
TOKO
R SC
2.2 uF
C OUT
3 .
9 .
4 .
0 .
0 .
7 .
D
V OUT
0
7
4
7
6
1
EXT
V IN
I S
(
%
0.1 V
)
20
10
16
14
12
18
+
-
I S COMP
0
L: D52LC, 15 mH
Toko Part Number: A914BYNW - 150M
EF LED (%) = 100 * V
2
Q
I LED vs. V IN
S
R
C X
CLK
V IN (V)
0.86 V
V LED
0.3 V
4
OSC
BAND GAP REFERENCE
CLK
I LED
0.525 V
V REF
6
ERROR
COMP
LED
TK11850L
+
-
* I
LED
7
8
EN
GND
C X
8
V FB
/ V
ON/OFF
R LED
27
56 pF
IN
Page 9
C X
* I
IN