Hello,
I have an application where I need to send a pulse train to a servo drive from a microcontroller. The input to the servo drive requires that i construct an open collector output and suggests that I use 12VDC through a 1kohm resistor, which will result in 12mA to the drive. On the return side it does not specify the transistor. So, I need to specify a transistor to switch the return side.
For this application I am able to switch at a max rate of 200k pulses per second, which is the equivalent of 200k "ons" and 200k "offs" per second for the transistor. This is where i am stuck. I am unable to search transistors by speed!!!! Can anyone suggest on? Also, if possible I would like to use a surface mount part and possibly one that is opto-isolated as the drive claims that it is not!