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It's very difficult to help you if you don't give details. Most of the time, there are many factors that have to be considered when designing a circuit and it often happens that the OP does not know which factors are important. Therefore, it's very frustrating when essential information has to be dragged out piece by piece.
sir
i want a digital output that has current limit protection /short circuit protection
ie the circuit must not give out more than .5a current if voltage is 60v.
if load res reduce and it takes more current than .5a then some how circuit must switch off.
is there any other method without using the sensing resistor
I'll try one more time. I could certainly design a protection circuit that is triggered by a current and/or voltage threshold, and I'm sure many other members of the forum could also do it. But the exact design details will depend on the type of what you call "a digital output", the type of load, frequencies involved, power supply, etc. You said that the limit should be 0.5A at 60V, but you also said that "the input supply will be from 24 to 60v". Does this mean that the power supply is variable?
All those details will determine where and how the overload current can be conveniently sensed, how the circuit can best be switched off, what type of protection circuit will be most suitable, and so on.
sorry i was not able to get what u had in mind.'digital output" means that this circuit that we are designing will get its input triggered from a controller and this circuit will then drive a load which will be a power relay.(actually we can say it as a driver with short circuit protection).we will be getting external dc supply which may vary from 24 to 60v as input to the driving circuit that we are designing.it dont mean a variable PS but the user may give any voltage in between as input to the circuit.
but since the circuit must work continously we must reduce heat to minimum
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