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Electronic Equipment > Electronics Repair > PWM Control IC ...
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PWM Control IC Problem (SG3525)

by alphamnemonic <shmotmail@[EMAIL PROTECTED] > Jul 2, 2008 at 03:35 PM

Hi Everybody

This chip normally puts out square pulses. In the power supply I am
working on (http://www.laserfaq.org/sam/150rcsch.pdf)
it is putting
out a sawtooth wave. I am testing it in 'standby mode', in which Q4 is
off and R33 is in control of the duty cycle. Replacing the IC1 has no
effect. Does anyone have any ideas?




 16 Posts in Topic:
PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-02 15:35:40 
Re: PWM Control IC Problem (SG3525)
 sam@[EMAIL PROTECTED]   2008-07-02 16:00:30 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-02 19:20:04 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-03 07:55:01 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-03 19:09:25 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-07 19:09:46 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-04 11:13:18 
Re: PWM Control IC Problem (SG3525)
 sam@[EMAIL PROTECTED]   2008-07-04 16:23:57 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-14 14:10:58 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-14 17:50:48 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-16 08:02:02 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-16 19:12:45 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-17 09:08:20 
Re: PWM Control IC Problem (SG3525)
 "Michael A. Terrell&  2008-07-17 13:08:08 
Re: PWM Control IC Problem (SG3525)
 alphamnemonic <shmotma  2008-07-17 11:49:07 
Re: PWM Control IC Problem (SG3525)
 Steve <nobody@[EMAIL P  2008-07-17 20:32:20 

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tan12V112 Mon Dec 1 23:53:40 CST 2008.