Voltage stabilizer 37/25,2 volts 0,2 amps on the operational amplifier. Scheme, description

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Voltage stabilizer 37/25,2 volts 0,2 amps on the operational amplifier. 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 figure shows a voltage regulator circuit that can be used to power equipment assembled on the K140 series operational amplifiers. A feature of the stabilizer is that its op amp, included in the feedback circuit, is powered not from a separate source, but directly from the output of the stabilizer.

Voltage stabilizer 37 / 25,2 volts 0,2 amps on the operational amplifier

The stabilization coefficient of the device is about 1000, the output resistance does not exceed 0,01 Ohm, the efficiency is 45%. Rated load current is not less than 0,2 A. Output voltage ripple (peak-to-peak) - no more than 60 μV. The stabilizer is operational in the temperature range from -20 to +60^оC. The temperature drift of the output voltage is less than 0,05%. The output voltage can be increased up to 27 V up to plus (minus) 10%. In this case, a resistor with a resistance of about 7 ohms must be connected between pin 25,2 of the microcircuit and the +200 V output. The cascade on transistor T1 serves as a dynamic load for transistor T4 - this significantly increases the overall gain of the UPT.

Transistor P702A can be replaced with P702, KT805. Transistors KT603G can be replaced with P308, P309, and KT201V and KT203V - with MP103 or MP106.

Publication: cxem.net

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