This is a simple circuit design of a simple soft start power supply based on IC L200.The L200 is a monolithic IC that can be used for voltage and current regulation. The built-in feature of the circuit is such as thermal shutdown, over current protection and input over voltage protection makes this IC nearly indestructible. This is a figure of the circuit.
Operation of the circuit is when the power supply to the circuit is switched ON, the capacitor C3 starts to charge through resistor R3.The internal comparator pin (pin2) of the IC is connected to the positive lead of C3. The input voltage to the IC can be anything between 18 to 40V DC. When capacitor C3 is charging the voltage at the internal comparator pin also increases. This slowly relaxes the current regulation loop inside the IC.
As a result the output voltage of the IC also slowly increase from zero to the set value of output voltage. In here the set output voltage is 15V. The IC1 must be fixed with using a heat sink. The output voltage can be set by the equation Vout = 2.77[1+ (R1/R2)]. The time duration can be set by the equation T = (R3C3/0.45)x (Vout - 0.45). The maximum current capacity of this regulator is 2A.
Operation of the circuit is when the power supply to the circuit is switched ON, the capacitor C3 starts to charge through resistor R3.The internal comparator pin (pin2) of the IC is connected to the positive lead of C3. The input voltage to the IC can be anything between 18 to 40V DC. When capacitor C3 is charging the voltage at the internal comparator pin also increases. This slowly relaxes the current regulation loop inside the IC.
As a result the output voltage of the IC also slowly increase from zero to the set value of output voltage. In here the set output voltage is 15V. The IC1 must be fixed with using a heat sink. The output voltage can be set by the equation Vout = 2.77[1+ (R1/R2)]. The time duration can be set by the equation T = (R3C3/0.45)x (Vout - 0.45). The maximum current capacity of this regulator is 2A.
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