TPS61196: PWM Duty range

Fandy

Part Number: TPS61196
Other Parts Discussed in Thread: TPS61199

Hello

I want to check the PWM Duty range, I find in datasheet,it recommend min PWM Ton is 10uS, so for 20KHz PWM, it min Duty is 20%,is it right?

I find TPS61199 's recommend min PWM ton is 1us, so it min Duty is 2% for 20KHz.

What's factor to limit this min pwm Ton ? one competitor's PWM duty range could be 1%-100% in range of 100Hz-20kHz.such as RT8532

over 6 years ago

0 Sean Zhou over 6 years ago

TI__Mastermind 22745 points

Hi Fandy,
The delay time of internal circuit limit those spec.
Regards
Sean

0 Fandy over 6 years ago in reply to Sean Zhou

Expert 2285 points

Hi Sean
As no value of Minimum PWM Ton in Electrical Characteristics , just described in 7.3.8 "The recommended minimum on time of the LED string is 10 μsec.Thus, the device has a minimum dimming duty cycle of 500:1 at 200 Hz"
so did it have some any margin of minimum PWM Ton ? actually my customer want to get 20% duty cycle at 20KHz PWM

0 Sean Zhou over 6 years ago in reply to Fandy

TI__Mastermind 22745 points

Hi Fandy,
I'm sorry that we don't have the margin data of the minimum on time. We just provide the typical value.
Regards
Sean

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TPS61196: PWM Duty range