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Question about VOLTAGE-MODE BOOST converter Current limit

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pswatw

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boost converter current limit

Hi:
I designed a VOLTAGE-MODE BOOST converter, it has current limit (1.5A) function. The principium of my current limit function is when the IL reache 1.5A
,The IC will turn the NMOS OFF and PMOS ON.

But, when i test the boost IC . It doesn't work correctly. When the IL reach the current 1.5A it will be limit in 1.5A for several seconds. but after several seconds the current will over 1.5A and the IC latch-up.

The question is when we design a current mode boost converter we need slope compensation to avoid the IC to be unstable. Now, I design the VOLTAGE-MODE BOOST converter current limit function , Do I need to use slope compensation to avoid the IC to be unstable.

THANKS!!
 

leo_o2

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site:www.edaboard.com current limit boost

It doesn't need to have slope compensation in voltage-mode DC-DC. For your problem, maybe you need to check your current limit circuit. If your current limit circuit is too close to Power MOS switch, it is easy to have latch-up according to substrate disturbance by Power MOS switching.
 

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