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TB62756FUG Fiches technique(PDF) 5 Page - Marktech Corporate

No de pièce TB62756FUG
Description  Step-up Type DC/DC Converter for White LEDs
Download  14 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62756FUG Fiches technique(HTML) 5 Page - Marktech Corporate

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TB62756FUG
2005-11-8
5
Output-side Capacitor Setting
It is recommended that the value of C2 be equal to, or greater than 1.0 (
µF).
External Inductor Size Setting
For each number of LEDs, the selected inductance should be greater than the value indicated in the
table below.
Number of LEDs
Inductance (Unit:
µH)
Note
2
4.7
3
4
6.8
5
6
10
IF = 20 mA
Control of IF
The resistance RSENS is connected between the FB pin and the GND pin.
The average current is controlled by the RSENS value, and calculated using the following equation:
IF (mA) = [ 325mV / RSENS(Ω) ]
Margin of error is ±5%.
Dimming using PWM signal input
A dimming function can also by applied using a PWM signal.
[Notes]
▪When using a PWM signal, the minimum pulse width of the PWM should be greater than 33µs.
▪Duty ratio of PWM function should be set at 10% - 90%.
▪The recommended PWM frequency should be 100Hz - 10kHz.
<<Output current is calculated using the following equation>>
IF(mA) =
RSENS [Ω]
325[mV]
× ON Duty [%]


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