[volt-nuts] 32-Bit PWM divider

[Andreas Jahn]

Hello Bruce,

>>> will have 2.5Vpp Integration ripple. When having a 50% duty
>>> cycle for S3
>>> there will be current spikes of 2.5V limited only by the 200R
>>> resistor and
>>> the resistance of the switch. These spikes increase the
>>> output noise. (I
>>> measured around 100uVpp with a LTC2400 A/D-Converter).
>>> Increasing the PWM
>>> duty cycle to around 97% will give a good compromize between
>>> noise and
>>> settling time of the output capacitors.
>>>
>>>
> Incorrect, the output of the error integrator is (or should be) sampled 
> when its output is small except during the first cycle after a large step 
> change in the MS PWM duty cycle.
> Thus the current transients in the sampling capacitor and switch should be 
> relatively small once the circuit has settled.
>