tb62734fmg TOSHIBA Semiconductor CORPORATION, tb62734fmg Datasheet - Page 6

• Manufacturer Part Number: tb62734fmg
• Description: Step-up Type Dc-dc Converter For White Led?s
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Current Control through the CTL Pin
With this IC it is possible to vary the I
The linearity tolerance during V-A conversion is ±10%.
Timing Chart
A terminal voltage
A terminal current
(external inductor)
CTL terminal current
I
O
CTL voltage
valuable rate
100
80
60
40
20
I
O (A)
0
1.0
LED V
peak
V
f
CTL
= 0 V to 0.4 V
CTL Input - Output Rate / Output Current
0
Io Rate
Io
CTL input – Output rate / Output current
f
OSC
O
current through the external resistance. Variable range: 30 to 100%.
= 1.0 MHz
1.5
V
CTL
If V
30 to 100
= 1 V to 2.5 V
Vin=3.0V
VCTL (V)
V
CTL
V
IN
CTL
= 3.0V
> 2.6 V, no brightness control function by CTL
(V)
6
2.0
V
CTL
100
> 2.6 V
Set LED current I
2.5
Unit: %
Note
O
TB62734FMG
25
20
15
10
5
0
stabilized while I
2006-06-14
O (A)
2.6 V
1.0 V
peak is controlled.