Economical stabilizer 10-20/9 volts 150 milliamps with a field effect transistor. Scheme, description

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Economical stabilizer 10-20/9 volts 150 milliamps with a field effect transistor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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The recommended voltage regulator is designed to power high-quality equipment. The use of a field-effect transistor as a regulating transistor (VT1) in it made it possible to supply a reference voltage source (resistor R1, zener diode VD1) and a DC amplifier (operational amplifier DA1) with an output stabilized voltage, and also to weaken to a minimum the connection between the input and the stabilizer (through the drain channel - source of the transistor), which reduced the penetration of input voltage ripples into the load.

Main Specifications

Voltage Stabilization Ratio ...............................70
Input voltage, V ............................................... ...10...20
Output voltage, V ............................................... .....9
Maximum load current, mA .......................................150
Output impedance, Ohm .........................................0,003

Economic Stabilizer 10-20/9 volts 150 milliamps with field effect transistor, voltage stabilizer

The voltage stabilization coefficient was measured at a load current of 30mA with a V7-34 digital voltmeter. When the input voltage changed from 10 to 20 V, the output changed by no more than 0,0001 V, which corresponds to a stabilization factor of 70.

The stabilizer is not afraid of a short circuit at the output, and overcurrent. As the load current increases, the gate-source voltage of the FET decreases. In this case, the voltage at the output of the op-amp increases to a maximum value, which is always less than the supply voltage. With a further increase in the load current, the gate-source voltage of the transistor becomes constant and equal to the difference between the output voltage of the stabilizer and the saturation voltage at the output of the op-amp - the stabilizer switches to the output current stabilization mode. With a short circuit at the output, the current through the stabilizer cannot exceed its maximum value, which is equal to the drain current of the transistor at zero voltage between the gate and the source.

The power dissipated by the control transistor during a long-term short circuit at the output of the stabilizer should not exceed the permissible one (for the KP903B transistor - 6 W at an air temperature not higher than 25^оWITH). If, for example, the maximum drain current of the transistor is 400 mA, then a power of 6W corresponds to a voltage of 15V. This is the highest input voltage of the stabilizer with a long short circuit at the output. When the load current is more than 30mA, the regulating transistor must be installed on the heat sink.

Capacitors C1 and C2 correct the frequency response of the op-amp, and C3 and C4 block the power supply circuits of the op-amp and the load. Capacitor C3 should be mounted as close to the op-amp as possible. The weakening of the influence of ambient temperature fluctuations on the output voltage is achieved by using wire resistors and a thermally stabilized zener diode and op-amp in the stabilizer. As a result, in the first minute after the power is turned on, the output voltage of the stabilizer changes within the range of up to 800 μV, over the next 20 minutes by no more than 100 μV.

The KS166A zener diode can be replaced with KS162A, KS168A, and the K551UD1B op-amp with K153UD5, K140UD12, K140UD6, K149UD7, K140UD10, K140UD11, K153UD2, K153UD4, K153UD6 or K140UD1A with appropriate correction circuits. But with such a replacement, the stability of the output voltage will deteriorate somewhat, because the voltage stabilization coefficient is directly proportional to the gain of the op-amp.

Establishing a stabilizer comes down to setting the required output voltage by changing the ratio of R2 and R3 ratings.

Publication: cxem.net

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