tb62731fug TOSHIBA Semiconductor CORPORATION, tb62731fug Datasheet - Page 14

• Manufacturer Part Number: tb62731fug
• Description: Step-up Dc-dc Converter For White Led Driver
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Application Circuit Example 2
(characteristic using flat coil for handy terminal as reference)
Flat coils suitable for handy terminals have a large DC resistance; thus, the power efficiency drops slightly, to
about 70%.
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: TDK LDR344812T-440
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Rohm MCR03-1R8
L1: TDK LDR344812T-390
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Susumu RL0510S-1R8
L1: Toko A914BYW-270M
S-Di: Toshiba 1SS404 20 V/1A
LED: Nichia NSCW215T
R_sens: Susumu RL0510S-1R8
ON
OFF
ON
OFF
ON
OFF
GND
GND
GND
SHDN
SHDN
SHDN
V
V
V
CC
CC
CC
44 µH
39 µH
27 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
R_sens
R_sens
R_sens
1.8 Ω
1.8 Ω
1.8 Ω
20 mA
16 mA
20 mA
20 mA
I
or
I
I
F
F
F
14
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
2006-06-14
4.2
4.2
4.2
25
20
15
10
25
20
15
10
25
20
15
10