why BQ2031 couldn't work in 100KHZ?

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Other Parts Discussed in Thread: BQ2031

Hello everybody,i have one question about the bq2031 . i use the BQ2031 to charge the 24V lead acid battery. when i choose 100KHZ,BQ2031 then didn't work(the MOD pin had no waveform),but when i choose 10KHZ,it could work. How can i let the BQ2031 work when the frequency was set 100KHZ? thanks a lot.

over 15 years ago

0 Bin Chen36084 over 15 years ago

TI__Intellectual 2295 points

two possible reason the circuit can work at 10kHz but not at 100kHz:

(1) loop is not stable at 100kHz. I simply compared it with EVM setting, it's 0Ohm and 0.1uF connect with VCOMP pin, 120k and 0.1uF might result in a unstable loop at 100kHz.

(2) please observe the duty and dead-time at 10kHz, if it's too narrow, the pulse at 100kHz might be too narrow to output

0 erdemokargin over 12 years ago in reply to Bin Chen36084

Prodigy 40 points

Where can I find more example circuits with BQ2031? Its datasheet doesn't have one.

0 Charles Mauney over 12 years ago in reply to erdemokargin

TI__Mastermind 31120 points

look on ti.com and search for DV2031S1

Power management

Power management forum

why BQ2031 couldn't work in 100KHZ?