I want to make current control via MOSFET based on LTC1968. The load will be full wave rectified sinusoidal ( not filtered ) and frequency will be max 400hz.
My design is in the attachement.
- I have used U1-LTC1968 and U2-LT1782 for RMS to DC convertion with DC accurate post filter according to Figure 13 of the LTC1968 datasheet.
- I have used U3-LTC6226 as gain amplifier for comparator and ADC input.
- U4- ADCMP600 is comparator for driving the mosfet via U5- 1EDN7512B gate driver. Comparator’s reference voltage supplied by U6- AD5760 DAC.
- U9- AD4001 ADC for readback value of the current.
According to application needs is this design reliable and fast enough for fast and precise current control? Do you advice any improvement or changing?