TPS61194-Q1: Dimming PWM Spec & CALCULATOR

CHO SR

Genius 3415 points

Part Number: TPS61194-Q1

Hi Team

Please answer my customer's question.

The TPS61194-Q1 PWM frequency is 100 Hz to 20 KHz, and the PWM Maximum On/Off time = 0.5 us.

1. What is the minimum duty when using the PWM frequency 200Hz?

2. If you have a duty calculation formula or sheet for each pwm frequency, please share it.

3. If you have CALCULATOR of TPS61194-Q1, please share it.

0 Charles-Chen over 4 years ago

Hi CHO,

1.0.5us/(1//200).

2.The minimum on time will not change with frequency.

3. The detailed design procedure is include in the datasheet and we haven't developed additional calculator for it.

0 CHO SR over 4 years ago in reply to Charles-Chen

Genius 3415 points

Charles

Thank you for your quick reply.

1.0.5us/(1//200).

2.The minimum on time will not change with frequency.

-> Then, should I say that there is no problem with 1% to 100% control of the dimming PWM duty ratio?

0 Charles-Chen over 4 years ago in reply to CHO SR

Hi CHO,

It is related to the PWM frequency actually. The minimum duty cycle will be 0.5us/(1/fpwm_maximum).

0 Charles-Chen over 4 years ago in reply to Charles-Chen

Hi CHO,

Do you have any more questions?

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