TB62757FUG Toshiba, TB62757FUG Datasheet - Page 5

• Manufacturer Part Number: TB62757FUG
• Manufacturer: Toshiba

Specifications of TB62757FUG

• Package: SOT23-6
• Supply Voltage: 2.8V to 5.5V
• # Leds Supported: 2 to 6 LEDs in series
• Sw Frequency: 1.1MHz
• Led Current Accuracy: ±5.23% (max)
• Protection Feature: Output overvoltage protection
• Other Features & Functions: -
• Rohs Compatible Product(s) (#): -

Setting of External Capacitor
C
C
current changing.
Setting of External Inductor Size
LED Current I
1
1
In case not using PWM signal to SHDN terminal for brightness control, recommended values are
In case with PWM signal to SHDN terminal for brightness control, recommended values are
The recommended capacitor values depend on the Brightness Control Method.
<Please refer the next page or later>
The capacitor value must be considered for gain enough accuracy of brightness with reduction of noise from Input
Please select the inductor size with referring this table corresponding to each number of LEDs.
The resistance between the FB pin and GND, R
Depending on the resistance value, it is possible to set the average output current Io (mA).
The average output current Io (mA) can be approximated with the following equation:
The current value error is ±5%.
= Over 2.2 (μF), C
= Over 4.7 (μF), C
I
F
= (325 [mV]/R
LEDs
2
3
4
5
6
F
Setting
2
2
= Over 1.0 (μF)
= Under 0.1 (μF).
SENS
[Ω])
Indictor Size
4.7 μ H
6.8 μ H
8.1 μ H
10 μ H
SENS
(Ω) is the resistance for the setting the output current.
5
LED current I
Note
F
= 20 mA
TB62757FUG
2010-06-306