Electronic – Use 2 optocouplers

Bridge parts selection. Heard a lot about packaged bridges lately. I have never used a packaged bridge. Always discrete fets and diodes. The diode augments the fet body diode. Once the voltage goes above 1200 Vpk then it's IGBTs. Discrete approach gives more control over efficiency, deratings, gate drive charge, etc.

Driving the gate with optos. Well I guess that's ok if there is something to limit the gate voltage between 0 and 15 volts. My experience is with isolated flyback supplies and electronic drive for the gates. I guess the opto drive would be ok to about 10 kHz-ish if the switching timing didn't have to be precise and the gate charge wasn't too big and the load was small and efficiency didn't matter. Check fet datasheet for "total gate charge" or something like. Also see above note about picking your own fets. A 10k pull up and 10 nC total gate charge to 10 V means 30us-ish switching time, give-or-take for gate drive nonlinearities, limiting you to sub 30kHz switching frequencies or smoking the fets in a somewhat analog mode. ie. slow fet transitions from off-on burn power in the fet.

There are lots of full-bridge fet drivers on digikey that may meet your gate drive needs.

Perhaps you would like to post separate questions for 1. bridge component selection, 2. fet drive dynamics, 3. HV isolated gate supplies, and any of the other issues that come up making HV bridge drive.

Look at the ULN2003 and related parts within the group darlington arrays, they're good for driving LEDs, small relays, etc. well over your current and power dissipation requirements. They're probably even overkill for such little currents.

Check out the use of a octal buffer or transceiver such as the common 74HC244 though instead of "HC" you may want to use a different part depending on your MCU's Voh/Vol logic levels and supply voltages vs. the required LED supply voltage. If the minimum needed LED anode voltage is sufficiently high (e.g. higher than the Vio/Vcc rail of your MCU / buffer IC) you'll want to choose a buffer that can have perhaps a higher output voltage (>= LED anode voltages when they are off) while maintaining logic level compatibility with the MCU LVCMOS or whatever output levels.

You could also use an application specific standard part which is a purpose built multi channel LED driver, for instance, the TLC59282 or numerous other 8 channel or 15 / 16 channel parts intended for the purpose. Many of those will be able to save MCU I/Os by interfacing to the MCU via a shift register or similar system if that might be useful.