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Designing Constant current in LT3796

Question asked by kumarbalaji on Jan 30, 2018
Latest reply on Feb 6, 2018 by szolusha

We are designing a battery charger using LT3796 and now we are in need to know how to set the o/p current.

We have two cases,

1.Vctrl is more than 1.2V, by the time the we have a sense resistor of 0.16Ohm so according to calculation 250mv/0.1Ohm=2.5A

But the actual o/p current is less than 0.5A

  1. Vctrl is less than 1V, by the time we programmed  to 1.2A but the max current we had is 0.8A

We didn’t use any current limiter.

And we have one problem

1.The gate frequency is unstable .We want it to be 130Khz and we chosen 58K resistor for that frequency but it is rapidly varying.

My question is whether the current can be programmed only with the sense resistor if Vctrl is >1.2V?

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