LCD Backlight Driver 14,3V @ 600mA with IC LT3956

Hi

Can you elaborate of the parameters you cannot find ?

Regards

Hi Mikee,

I draw a simulation circuit on LTSPICE. 

My common problem is, my circuit can not work on buck mode. Our design have to work 9 to 36V supply voltage,

When i apply 12V input voltage, circuit work fine. (Bost model OK)

When i apply 36V input voltage, i can not control output current. (Buck mode)

I am getting 7A output current.

My display parameters are Vf=14,3V IF=600mA

Could you please help on simulation circuit. Because I produced this circuit and does not work correctly.

LT3956_TA01A.asc

Hi Mikee,

I draw a simulation circuit on LTSPICE. 

My common problem is, my circuit can not work on buck mode. Our design have to work 9 to 36V supply voltage,

When i apply 12V input voltage, circuit work fine. (Bost model OK)

When i apply 36V input voltage, i can not control output current. (Buck mode)

I am getting 7A output current.

My display parameters are Vf=14,3V IF=600mA

Could you please help on simulation circuit. Because I produced this circuit and does not work correctly.

LT3956_TA01A.asc

I have another question. LT3956 works with the same hardware configuration Buck and Boost mode? Or it works with different hardware schemes.

Hi 

The circuit you are currently using is for the boost configuration. 

For the buck-boost operation please refer to sample circuit  on page 17

and SEPIC sample on page 18 of the data sheet

Regards

On page 18 SEPIC sample  with simuation work fine. 

On page 18 SEPIC sample  with simuation work fine. 

Thank you for support.

Yes. i solved my problem. Thank you for support.