Questions tagged [open-collector]

An open collector is a common type of output found on many integrated circuits (IC).Instead of outputting a signal of a specific voltage or current, the output signal is applied to the base of an internal NPN transistor whose collector is externalized (open) on a pin of the IC. The emitter of the transistor is connected internally to the ground pin. If the output device is a MOSFET the output is called open drain and it functions in a similar way.

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IR2110 - Open Collector Output Problem

I'm trying to design an inverter and I'm using 2 IR2110 as gate drivers but my MCU board PWM outputs are open collector, I've added a pull-up and transistor to feed IR2110 with 5V pulses but it's not ...
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ULN 2003 open collector

I have searched for troubleshooting the ULN and did not find any solution. I use a ULN chip in a motor inverter for controlling precharge relay and main relay. The problem is when the motor inverter ...
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Confusion with the reasons collector area being greater than the emitter region

Often I come up with the following reasoning when it comes to why collector has larger area than the emitter: For less power dissipation collector area should be more. In other words, when area ...
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Using open collector output from fan sensor to opto-isolator for MCU GPIO

I have a cooling system that uses an external temperature sensor to turn on two HDF4020L-12HHB 12VDC fans and I need to use the locked rotor sensor outputs from the fans as inputs to a MCU (5V logic) ...
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Totem pole vs open collector configuration

Can anyone please explain for power consumption view point only whether totem pole or open collector should be preferred with a bit explanation?