Converting 400 to 500 mV signal to 0 to 10 V PWM signal
Use 14+V supply with an Op Amp with  150MHz GBW and complementary Darlington inside the feedback loop and drive with a CMOS Oscillator or CMOS Schmitt trigger variable F Oscillator with coarse/fine tuning on f 1 to 3MHz for maximum DC current at resonance using a 50mV drop R sense.

details are easy to web search for this suggested method., even on my answered questions in this site for “high current high GBW Op Amps, Variable F Astable Schmitt CMOS and complementary Darlingtons of FET CMOS bridge “

But for variable power, you can adjust gain and start with “purpose and exact requirements and tolerances”.!!!  


i.e. don’t start with a Mickey Mouse osc.