I have an application that requires 8 channels of 1v to 12v at about 30 ma max. This voltage is "settable" and varies slowly over time in response to process conditions. This must be "high side" drive.
My attempt was using a TLC59116 (Datasheet) to drive a TBD62783AFNG 8-channel DMOSFET gate array (Datasheet) but I discovered that the turn-off spec on the TBD62783AFNG was 2 usec and the (fixed) PWM frequency of the TLC59116 (97-kHz) meant that I had very little usable range of the PWM signal.
I selected the TLC59116 because the (ATMega1284P) application firmware already has support for this chip that is used elsewhere on the board.
I don't have any pins left over to 'roll my own' PWM.
I could switch out the TLC59116 for a PCA9685 (Datasheet) which has a PWM frequency that is settable from 24 Hz to 1526 Hz but I would like to avoid that due to requiring an additional support module in the firmware.
I looked for other gate arrays in the 'TBD' sequence but the others were either no faster or were for 'low side' drive applications which won't work here.
I would like to keep this to a two-chip solution due to board real-estate.
Does anyone know of a faster, high-side gate array I could use and retain the TLC59116?
It's ok if it's inverting or not because I can account for that in my PWM setting.
Thanks in advance for any insight you might offer ...