tb62731fugel Marktech Optoelectronics, tb62731fugel Datasheet - Page 13

• Manufacturer Part Number: tb62731fugel
• Description: Step-up Dc-dc Converter For White Led Driver
• Manufacturer: Marktech Optoelectronics

Application Circuit Example 1
Though it is necessary to consider the DC resistance of L1, an inductance of 33 to 47 (typ.) to 68 µ H is suitable for
turning on four LEDs.
3.2 V~4.2 V
3.2 V~4.2 V
3.2 V~4.2 V
V
V
V
IN
IN
IN
10 µF
10 µF
10 µF
C1
C1
C1
L1: Toko A914BYW-470M
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Rohm MCR03-1R8
L1: Toko A914BYW-470M
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Rohm MCR03-1R8
L1: Toko A914BYW-470M
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Rohm MCR03-1R8
ON
OFF
ON
OFF
ON
OFF
GND
GND
GND
SHDN
SHDN
SHDN
V
V
V
CC
CC
CC
47 µH
47 µH
47 µH
L1
L1
L1
GND
GND
GND
A
A
A
K
K
K
S-Di
S-Di
S-Di
1 µF
1 µF
1 µF
C2
C2
C2
(characteristic using recommended coil as reference)
R_ sens
R_ sens
R_sens
1.8 Ω
1.8 Ω
1.8 Ω
20 mA
20 mA
20 mA
I
I
I
F
F
F
13
100
100
100
90
80
70
60
50
40
90
80
70
60
50
40
90
80
70
60
50
40
3.2
3.2
3.2
Input voltage – power efficiency/mean current
Input voltage – power efficiency/mean current
Input voltage – power efficiency/mean current
3.4
3.4
3.4
Input voltage V
Input voltage V
Input voltage V
3.6
3.6
3.6
3.8
3.8
3.8
IN
IN
IN
(V)
(V)
(V)
TB62731FUG
4
4
4
η
I F
η
I F
η
I F
2004-09-14
4.2
4.2
4.2
25
20
15
10
25
20
15
10
25
20
15
10