Boost converter

Aradhyasambhu Satpathy

Intellectual 540 points

Other Parts Discussed in Thread: TPS61088

Why DC - DC boost converter has a right hand plane zero?

over 5 years ago

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Dear Sir,

You can refer to the TPS61088 boost converter datasheet. In the datasheet, you can find the below formula for the power stage transfer function.

0 Aradhyasambhu Satpathy over 5 years ago in reply to Helen chen

Intellectual 540 points

Hi Helen,

I appreciate your effort. Thank you. I am curious to know how this right half plane zero arises physically.

0 Helen chen over 5 years ago in reply to Aradhyasambhu Satpathy

TI__Mastermind 40080 points

Dear Sir,

If the frequency of the 'right half plane zero' is high, >10 times the crossover frequency , then it will has no effect on the stability.

But if the frequency of the 'right half plane zero' is low, <5 times the crossover frequency, then it may effect the stability. So for the boost converter, we need to calculate it and make sure it is far away from the crossover frequency.

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Boost converter