TPS65286: Constant Current Control

Keith Keller

Part Number: TPS65286

Hello,

Is it possible to pull down on the COMP pin like this diagram to implement constant current control?

Thank you, Keith

0 Jason Wang (BSR-MV) over 5 years ago

Hi,

We are looking into your request and give you feedback on Monday.

0 Zhao Ma over 5 years ago

Hi, Keith

I want to know more information about your thought.

1. Diode is Zener diode? what is it used for? clamping COMP voltage?

2. What is the added AMP used for? how to connect its in+/- end?

3. What is your application?

0 Keith Keller over 5 years ago in reply to Zhao Ma

Hi Zhao,

Sorry for the drawing. That is not a zener, it is a diode to only pull down on COMP pin.

What we want to do is set Vout = 21.0V, and then do constant current control for charging a 5s battery.

The max charging current will be 6A.

Thanks very much for your help. Keith

0 Zhao Ma over 5 years ago in reply to Keith Keller

Hi, Keith

TPS65286 uses peak current mode, the COMP voltage repsesnts peak inductor current, why do you want to pull down COMP voltage?

BTW, suggest using charger IC to charge battery.

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