TB62737FPG Toshiba, TB62737FPG Datasheet - Page 4

• Manufacturer Part Number: TB62737FPG
• Manufacturer: Toshiba

Specifications of TB62737FPG

• Package: SON6
• 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: Analog dimming
• Rohs Compatible Product(s) (#): -

Setting of External Capacitor
Setting of External Inductor Size
LED Current IF Setting
Protection in LED Opened Condition
Please select the inductor size with referring this table corresponding to each number of LEDs.
Recommendation
The resistance between the FB pin and GND, R
Depending on the resistance value, it is possible to set the average output current I
The average output current I
The current value error is ± 5%.
The operation with OVD terminal is available for the protection in case LED Circuit opened.
In the case of LED open circuit, Overvoltage output is detected and switching operation of NchMOS is stopped.
( *If the voltage returns to detection level or less, operation is enabled again. )
C
C
current changing.
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
= 2.2 (μF), C
= Over 4.7 (μF), C
I
F
= (325 [mV]/R
LEDs
2
3
4
5
6
2
= Over 1.0 (μF)
SENS
2
= Under 0.1 (μF).
[Ω])
F
(mA) can be approximated with the following equation:
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.
4
LED current I
Note
F
F
= 20 mA
(mA).
TB62737FPG
2010-11-16