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SG3525 Duty Cycle?
SG3525 Duty Cycle?
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Old 17th February 2007, 04:02 AM   #1
thefish is offline thefish  United States
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Default SG3525 Duty Cycle?

How can I set the Duty cycle on a SG3525? I am using the schematic attached, and it was working fine but suddenly the duty cycle droped... I swapped the chip and it works fine again... going back to the old Chip I discovered adding 6V to the COMP pin also restores the Duty cycle to 50%... what is goin on?
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Old 17th February 2007, 10:53 AM   #2
Leolabs is offline Leolabs  Malaysia
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This might help:
www.st.com/stonline/books/pdf/docs/4286.pdf
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Old 17th February 2007, 03:09 PM   #3
thefish is offline thefish  United States
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I have this doc but it does not really help... I am thinking it is a problem with my chip because as I said it goes back to normal when I swap it out... but the strange thing is why does adding 6V to COMP bring it back to normal?
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