The analog pin will control the output from 0 to 100% if done correctly. How the Remora was implemented did not give the full range of control.
Originally Posted by mr_blinky
To PWM the Blue Shark or the Shark Buck you will need to do the following.
The fixed resistor on the Blue shark that is part of the voltage divider for the Analog control should be used as the pullup to an open collector output from the microprocessor.
The open collector output should then have a voltage divider/filter to divide the PWM signal in half. This will be the proper signal level for the analog input. 100% on is 1/2 Vref. Zero volts is full off on the analog input.
PWM ---R----+----------+---- Shark Control input
Input | |