tca62735aflg TOSHIBA Semiconductor CORPORATION, tca62735aflg Datasheet - Page 13

• Manufacturer Part Number: tca62735aflg
• Description: Charge Pump Type Dc/dc Converter For White Led Driver
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2) Input analog voltage to ISET terminal
*This method is without repeating IC ON/OFF, and no need to consider holding rash current.
1. Precondition
2. The maximum current is defined as αmA.
3. A minimum current is defined as βmA.
4. I
C
C
• Please set the range of the analog voltage input by 0 to 0.61V.
LED
2
1
=1.0µF
=1.0µF
can be set according to the next expression.
α[mA] = 0.61[V] ×
β[mA] = 0.61[V] ×
I
LED
25
20
15
10
5
0
[mA] = V
0
C2-
C1-
C2+
GND
ADJ
[V] ×
R
V
1
ILED vs. VADJ
ADJ
=16kΩ
R
0.2
2
R
R
[kΩ]
1
=0V~0.61V
1
1
β[mA] - α[mA]
[kΩ] × R
[kΩ] + R
VADJ (V)
13/18
0.61[V]
× 400
CTL2
CTL1
CTL0
C
2
2
EN
OUT
[kΩ]
[kΩ]
R
2
0.4
=47kΩ
=1.0µF
+ α[mA]
× 400
0.6
TCA62735AFLG
2007-06-21
V
IN
=2.8V~4.2V
C
IN
=2.2µF