I'm planning to build a pwm driven H bridge. I have all set up, flyback diodes, pull up and down resistors on high and low on bridge's side, decoupling capacitors and so on, but I only have TIP122 Darlington BJT available at my university. I know I need a big base current to charge base capacitance as fast as possible to allow faster PWM frequencies. Unlike some FET's, it doesn't have "fast switching" written on its datasheet. But besides that, the datasheet lacks the "ON base input resistance" and the input capacitance, only output capacitance.
How can I say for sure that this BJT doesn't suits me? I'm planning using 100Hz for pwm