TPS92641: Analog dimming: IADJ lower limit

franziskus

Part Number: TPS92641

Team,

Working with TPS92641 analog dimming, my customer discovered that analog control on IADJ pin lower limit is around 250mV. Below this limit, the driver enters in a kind of pulse skip mode.

Is this behavior documented?
Is this limit consistent for all circuits?

Thanks!

over 6 years ago

0 Irwin Nederbragt over 6 years ago

TI__Mastermind 28655 points

Hello,

It should have much more range than 250 mV.
What are they using for a load? What is the input voltage and output voltage?
Is there anything else being done when Iadj is being lower or is it just powered on and Viadj is being lowered?
What is the pulse skip mode? Is it flashing on and off? If so what frequency?
Have they modified the board? How is Viadj being controlled?
Can these signals be checked with an oscilloscope?

Best Regards,

0 Irwin Nederbragt over 6 years ago in reply to Irwin Nederbragt

TI__Mastermind 28655 points

Hello,

I haven’t heard back from you, I’m assuming you were able to resolve your issue.
If not, just post a reply below (or create a new thread if the thread has locked due to time-out)

Best Regards,

0 franziskus over 6 years ago in reply to Irwin Nederbragt

TI__Expert 8349 points

Irwin,

sorry for the delay. The customer was able to resolve the issue. I don't have any details but they have changed some of the components on the EVM (not the TPS92641).

Thanks!

Power management

Power management forum

TPS92641: Analog dimming: IADJ lower limit