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difference between 1n5402 and by399 diode?

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jit_singh_tara

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hello friends,
i am using a stepper motor driver circuit by using l297/l298 .the circuit uses 2A fast switching diode , can you tell me what are these meant for ,also the circuit is not able to drive high torque stepper motor ,please suggest a mosfet based circuit.thanks a lot
 

Fast recovery diode, such as BY399 or ZT302, has very good response time while working with fast rising or fast falling signals ..
If an inductor (coil) is switched on/off hard the voltage it produces can be very high ..
You need fast recovery diodes to meet this requirement, as a generic soft-recovery diode, such as the 1N5402, will allow virtually the entire high voltage pulse to pass before it actually electrically switches back to a passing state ..
The diode is supposed to reroute the voltage/current from the coil back onto itself, so the magnetic field is dissipated from the coils own electrical resistance ..

Rgds,
IanP
 
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