SG3525 Frequency
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 27th January 2009, 10:14 AM #1 microsim444   Account Disabled   Join Date: Oct 2008 SG3525 Frequency What is the formula used to calculate the frequency for the SG3525? That info was not provided in the Datasheet. ?
 27th January 2009, 11:07 AM #2 pjp   diyAudio Member     Join Date: Nov 2006 Location: under the rainclouds The formula is given in a footnote on page 4 of the ST SG3525 datasheet.
 28th January 2009, 08:01 AM #3 microsim444   Account Disabled   Join Date: Oct 2008 Sheet I had the wrong data sheet from www.alldatasheet.com The one i have for the Motorola version!! Thanks
 28th January 2009, 09:48 PM #4 N-Channel   diyAudio Member     Join Date: Mar 2003 Location: Sol System Clock (oscillator) frequency is: F = 1/{0.7 * 3[R(d)] * R(t) * C(t)}. So if you have no deadtime resistor, R(d) drops out of the equation. Now, for a clock frequency of, say, 120kHz, if your R(t) = 3.6kW, then your C(t) would = 3300pF. F(osc) is actually 120.25kHz, but that's close enough. Remember, the SG3525 is dual-ended, so your switching frequency is always one-half the clock frequency, so your F(sw) = 60kHz. Hope this helps. Regards, Steve __________________ -. ---.. -..- ---
 9th April 2009, 04:43 PM #5 rajudp   diyAudio Member   Join Date: Mar 2005 Location: Kerala the frequency is 1/{( 0.7RT+3RD) * CT}
 9th April 2009, 08:05 PM #6 N-Channel   diyAudio Member     Join Date: Mar 2003 Location: Sol System Oops! I guess I had the paranthesis-bracket-symbology a bit mucked up. Yes, Rd is multiplied by 3, and Rt is multiplied by 0.7 Apologies for the confusion. Steve __________________ -. ---.. -..- ---

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