I want to build robot with 2 DC motors to move like a tank. So I need 2 H-bridges (one per motor) to be able reverse the rotation.
I used https://www.pololu.com/product/1117 motors rated for stall 0.8A at 6V, and rated to 3-12V. I also used some H-bridges rated 2A+ and 7.6V LiOn battery, but eventually I burned 3 H-bridges :(
On the last I was able to make some measurment and it showed -30..30V spikes (on DSO138 osciloscope) and sometime about 1.6A (at common mutlimeter - slow).
So I decided to build more robust H-bridge (to not burn at all) and make measurement on that. something like BJH H-bridge going in reverse but not forward, LL transistor overheating with transistors rated 10A, 100V ( TIP142, TIP147 ).
But I found in datasheet, that for Resistive load Turn-on time is 0.9us while Turn-off time is 4us - this lead me to conclusion, that when swithing eg. left side top/down it would shortcut the rails for 4 - 0.9 = 3.1us
Is that right conclusion? Is that a real problem? And if it can be corrected/used, what is good PWM speed to drive it effectively?
Thank for your help