HP-X amp/amplifier power board /Refer to SIGMA22 A22 circuit - finished | Электроника

HP-X amp/amplifier power board /Refer to SIGMA22 A22 circuit - finished | Электроника

PCB specification: 110X75X2MM   2OZ copper-green bottom white spray process, on-board component parameters.   Does not contain main filter capacitors.   This is a finished board that debugs OK. (without capacitance)   The output voltage is set to +/-30VDC by default. (Input voltage is recommended for dual AC18V-29V)   DC5-36V dual power supply output can be made by replacing the resistor and corresponding voltage regulator tube; if other voltages are needed, please add a note after placing the order.   【Explanation】: Series regulator circuit, single-digit UV level index, infinitely close to the battery level; maximum support for 30A current output; sense neutral, background super quiet, high resolution. By replacing the resistor and corresponding voltage regulator, it can do 5V-36V dual power output, the maximum output is 30A, which is very suitable for medium and large amp and desktop power amplifier, medium and high power rear stage.

[Introduction]:
Full discrete component structure, single-stage series regulator design. No ic use, so that the entire design can control each control loop node to make the performance parameters of the voltage regulator achieve the best state. The complementary regulator structure, the negative voltage regulation part is a complementary image of the positive voltage regulation part. Ultra low noise, very high PSRR (power ripple rejection ratio). The low-pass filter's knee frequency is as low as 1.6 Hz to prevent diode switching noise from entering the error amplifier. This part also has a soft-start function. Effectively guarantees that the output noise of the regulated power supply is as low as μV.

The fully discrete design of the error amplifier drags and drops the lt;/span>op of 102.5dB open-loop gain. Voltage dual-track tracking, the output voltage of the positive pole is based on the voltage of the precision regulated source and the gain of the error amplifier. The output voltage of the negative terminal is the output voltage of the reference positive electrode, and the gain of the error amplifier is -1. A small voltage fluctuation at either end will immediately react at the other end. This feature also improves the CMRR (common mode rejection ratio) performance of the amplifier used in the back end.

The high-current MOSFET ensures that the current output of the regulated power supply is sufficient, the current is up to 30A (depending on the maximum current of the diode), and the back-end equipment can be protected even when the temperature is out of control.