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Gain of modulator and filter in voltage mode , half-bridge SMPS

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grizedale

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Hello,

Do you know what is the above gain?


Page 202 of Marty Brown's Power Supply Cookbook says its " (Vin /delta Ve)* (Nsec/Npri) = (Vout/Vin) "

But these two expressions are not the same.

Also, what does Brown mean by "Ve"

...is he talking about the maximum possible error amp voltage, or the particular delta Ve at the Max. Load condition.
 

I'm assuming Vin is the output of the error amp and delta Ve is the peak to peak range of the oscillator ramp, but without seeing a schematic it's hard to be sure. Also not sure what you mean by the filter.
 
"Vin" is the DC input voltage to the smps.

Ve is quoted as being the "peak-to-peak output voltage of the error amplifier"

...but it doesnt say whether it means the ......

'MAXIMUM peak-to-peak output voltage of the error amplifier'

OR THE

'peak-to-peak output voltage of the error amplifier AT MAXIMUM LOAD'.
 

That equation by itself doesn't make sense then. It should take a form like Vout=Vin*D*Ns/Np, with D expressed as Verror/Vramp or something. In that equation the gain is just Vout/Vin=G=D*Ns*Np. But that equation takes neither of those forms, and I don't see how it could be correct.
 
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