Voltage stabilizer at the op-amp, 0,2 amperes. Scheme, description

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Voltage stabilizer at the op-amp, 0,2 amperes. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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One of the main components of the DC voltage stabilizer, which determines the level of quality indicators of the power supply, is a DC amplifier (UCA). Highly stable power supplies require the use of complex, high quality DC converters. Such amplifiers, if implemented on discrete elements, are relatively bulky, critical to changes in external conditions, and expensive.

Therefore, it is most convenient to use microcircuits in the UPT, in particular, operational amplifiers (op-amps) of the K140 series.

On fig. 1.10 shows a voltage regulator circuit that can be used to power equipment assembled on 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. 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 - not less than 0,2 A. Output voltage ripple (peak-to-peak) - less than 60 μV.

Voltage stabilizer on the op-amp, 0,2 amperes

The stabilizer is efficient in the range of ambient temperatures from -20 to +60°C. The temperature drift of the output voltage is less than 0,05%.

The output voltage of the stabilizer can be increased up to 27V ±10%. In this case, a resistor with a resistance of about 7 ohms must be connected between pin 25 of the microcircuit and the +200 V output. The cascade on the transistor VT1 serves as a dynamic load of the transistor VT4, which significantly increases the overall gain of the UPT. Instead of the transistor P702A, you can use P702, KT805. Transistors KT603G can be replaced with P308, P309, and KT201V and KT203V - with MP103 or MP106.

Author: V. Budyakov

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