Do voltage regulators limit current?
It is important to understand that a regulator holds its output voltage fixed only when it is in constant voltage mode. In current limiting, the output voltage will be reduced as required to hold the load current at the set limiting value.
How do I limit amp output?
Lower the circuit’s amperage by adding a variable resistance device or increasing the resistance on any you already have in the circuit. Variable resistance devices include transistors, FETs and rheostats, which are two-terminal variable resistors. Reduce the voltage in your circuit to lower the amperage.
When do you need a current limiter for a voltage regulator?
When the amount of current required of from a power supply exceeds its maximum capacity, we need a Current Limiter. (Over current protection) The voltage regulator we use is made up of a zener diode and a pass-through transistor.
When does a voltage regulator need overcurrerrerrer protection?
There are times when the amount of current that is required of a power supply exceeds its potential. If the current demand is very high, the pass transistor of the voltage regulator may be damaged. On these cases it is necessary that the circuit has an overcurrent protection.
Can a pass through Transistor damage a voltage regulator?
The voltage regulator we use is made up of a zener diode and a pass-through transistor. If the current required in the load exceeds the maximum collector current of the transistor, the transistor can be damaged. To avoid this problem it is necessary to have a circuit that protects against over currents.
What are the two types of current limiter circuits?
There are two main types of current limiter circuit: Constant current limiting : Using constant current limiting, the output voltage is maintained as the current rises until a point is reached where a maximum is reached. At this point the current maintained at this level whilst the voltage falls with increasing load.