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TB62750FTG Fiches technique(PDF) 8 Page - Marktech Corporate

No de pièce TB62750FTG
Description  Step Up Type DC-DC Converter for White LED
Download  10 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62750FTG Fiches technique(HTML) 8 Page - Marktech Corporate

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TB62750FTG
28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)
8
Tentative
Explanation of operation
Setting the operating mode】
1.Selecting the four modes shown below with logic input terminals: EN1 and EN2.
EN1
EN2
MODE
L
L
L
H
Shutdown mode
H
L
Light mode
H
H
Flash mode
Flash mode
It can be driven with the constant-current at 800mA (max.).The maximum lightning time is 300ms.
Because it controls the FB+ at 300mV, the equation shown below is obtained.
Iout(mA)=300(mV)÷R1(Ω)
Pay attentions to the differences of the connected resistors and the power consumption.
The recommended resistor is as follows;
Three or more resistors (1/4 W) in parallel.
Light mode
It can light continually by driving at constant-current (350mA in max.).
It sets the current of K1 to K3 based on the resistors: R1, R2, and R3.
The current value of IL is recommended at about 20μA.
Set R2 at 51kΩ to 75kΩ.
When R3 is set at 0Ω, the same current is set in the flash mode and the light mode.
Shutdown mode
It stops the operation.
Iout(mA)=
1.2V(Internal Vref)X
R2
R3
0.3V -
R1


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