TPS61196: Dimming Resolution up to 5000:1 based on what frequency?

NObody

Expert 1100 points

Part Number: TPS61196

Hi, Sorry to bother.

Customer want to know what frequency when dimming resolution up to 5000:1?

Another problem is that we found a paragraph of text at 7.3.8 PWM dimming as below.

If the minimum on time is 10uS, I think maximum dimming (5000:1) is happened at PWM frequency 20Hz, right?

Anyway, could you help to clarify the maximum dimming rate and happened at which PWM frequency.

Thanks a lot.

over 7 years ago

0 Caryss Li over 7 years ago

TI__Expert 4550 points

LED short protection is disabled when PWM ton time shorter than 10us.
the device could operate at 2us PWM ton time without LED short protection, then 5000:1 dimming ratio is achieved at 100hz.

0 NObody over 7 years ago in reply to Caryss Li

Expert 1100 points

Hi, Caryss：

Base on your response, 500:1 (@200Hz) is minimum dimming duty with LED short protection and minimum dimming duty can up to 2500:1 when disable LED short protection. right??

0 Caryss Li over 7 years ago in reply to NObody

TI__Expert 4550 points

Yes.

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TPS61196: Dimming Resolution up to 5000:1 based on what frequency?