TPS92691: Can TPS92692 be configured with a low side current sense resistor?

Hi Victor,

Which one are you asking the question for, TPS92691 or TPS92692?

Thanks Tuan

I meant TPS92692.  I see that TPS92691 can be configured for a low side current sensing on page 1 of the datasheet.

Hi Victor,

The TPS92692 can be configured as low side sensing but the PWM'ing FET driver will not work since we use CSP as a supply for driving the PDRV for the dimming PWM'FET. So if you are planning to use the PWM dimming than this is not possible. The other issue is the SLOPE compensation is also dependent on the CSP feedback and slope compensation will need to be determined depending on the topology and design.

Is there a reason why you want to do low side sensing? By this do you mean the resistor is relative to GND and for what topology.

Thansk Tuan

Yes, I mean that CSN would be connected to ground and CSP connected to the end of the LED string. This will be used in a boost configuration. I would like to use low side sensing so that I can adjust the current per application note SLVA471. Or will applying a voltage at Iadj be just as accurate in controlling the current as the method outlined in the application note?