TB62737FUG Toshiba, TB62737FUG Datasheet - Page 4

• Manufacturer Part Number: TB62737FUG
• Manufacturer: Toshiba

Specifications of TB62737FUG

• 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: 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, RSENS
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%.
The operation with OVD terminal is available for the protection in case LED Circuit opened.
Please see the example of application circuit.
If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage.
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
= Over 2.2 (μF), C
= Over 4.7 (μF), C
I
F
= (325 [mV]/RSENS [Ω])
LEDs
2
3
4
5
6
2
2
= Over 1.0 (μF)
= Under 0.1 (μF).
Indictor Size
4.7 μ H
6.8 μ H
8.1 μ H
10 μ H
(Ω
) is the resistance for the setting the output current.
4
LED current I
Note
F
= 20 mA
TB62737FUG
2010-07-01