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Thanks Madcow for your reply.. 1. "Is the 300mv the peak deviation when the load switches? IE. Transient response. 2. Does the dsp run a filter before the pid loop? 3. What filtering is on the analog solution, you may have stability issues." answering here.... 1. Its 300mV pkpk ripple at...

hgldr, thankyou for your response regarding SMPS design for low output ripple... "Analog PWM is the way to go. DSP is going to yeild too much bit error" With reference to this, with dsPIC30F2020, i can get 10 bit resolution for feedback voltage with the on-chip ADC. Also, the sample rate is...

Hi, Thanks for you reply... "The SW based one you are using is the DEV board as is, running the stock output, correct? " ...Yes indeed, this SW based one is the example in the User's Guide. The code is called "SMPS_PID_Control.s" The User's Guide is...

Hi, Google D.43C doesn't reveal much...so.... An obsolete part?....is it an old Harris Semiconductor part?...What's the date that this PCB was designed? Who designed it? Send the circuitry surrounding it to us via http:www.tinypic.com (you can paste in the tinypic.com link here to your...

Thanks for these contributions. "use a high frequency switching frequency so the loop can respond quickly. " Regarding the above, kindly received from Logbook, I believe you are right, -however, there is some thought now that we want a low SMPS transistor switching frequency....this is to...

Hi, Does any reader have knowledge about how good Programmable SMPS PWM controllers are? (using PIDJ software to do the PWM). -That is, are they better or worse than standard 'analog' (non-programmable) PWM controllers? ('J' is for derivative of the derivative) I have been running the Sync...

Dear Readers, I am using Microchip’s Synchronous Buck Demo Board with dsPIC30F2020. This comprises two buck converters on a PCB. I am finding that I have 0.7V on the output of the Buck converters even when the input is disconnected. ………Please see page 43,44 of the user’s guide……...

Hi, Thanks for these replies. I am including the transient response situation in the ripple. The load is switching and it's not possible to tell exactly what the load will be when it switches on, the SMPS will just have to regulate well and keep the ripple down to 0.01%. Apologies...in my...

I am trying to design a 10KV (Vout) SMPS with 1V peak to peak ripple on the output voltage. (No linear regulators are allowed here). The load is a pulsed load and could be anything up to 250Kohms. The load duty cycle is 10% or less. And the Pulse repitition frequency is 200Hz to some 30KHz...