1pc Sigma22 Fully Discrete Regulated Power Supply (Dual Rail±5V ～±36V)Kit DIY
DIY KIT Project：
DIY kit: Contains the PCB and the components needed on the PCB, but does not include the power transformer .
To complete this project, high level knowledge of electronics and rich experience in terms of soldering and testing are required.
Due to time zone and language communication restrictions, we can only provide limited technical support, and you need to solve problems by yourself.
Tech highlights：
Single-pass, series regulator design.
No IC (integrated circuits) are used.
The negative regulator is a complementary mirror image of the positive regulator.
Low noise, high PSRR.
A constant-current source feeds a zener diode as a stable voltage reference.
A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier.
The low-pass filter also provides a soft-start characteristic.
The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB.
The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio).
A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load.
The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.
The positive regulator's output voltage is based on the reference zener voltage and the gain of its error amplifier.
The negative regulator's voltage reference is the output voltage of the positive regulator. Its error amplifier has a gain of -1, so that its output voltage is the inverse of the positive regulator's output voltage. The negative regulator dynamically "tracks" the positive regulator -- any small voltage fluctuations on the positive rail also appear inverted on the negative rail, improving the CMRR (common mode rejection ratio) of the amplifier being powered.
The tracking behavior means that the voltage on both rails rise and fall equally.
High-current MOSFET pass transistors
The high current rating provides a very high safety headroom against overcurrent damage.
Onboard heatsinks can be used which would allow the S22 to supply up to 0.3A continuous (with much higher peak currents).
More sustained currents are possible by using larger, offboard heatsinks.
The negative temperature coefficient of MOSFETs prevents damaging thermal-runaway conditions that may plague conventional BJT devices.
Configurable for rail voltages up to ±36V.
The voltage is selected by using an appropriate reference zener diode, choosing the value .
Typical output voltages are ±5V, ±9V, ±10V, ±12V, ±15V, ±18V, ±24V, ±27V, ±30V or ±36V.
Do not short the output terminal to discharge capacitor, otherwise it will damage the power board.
Typical Application
Input voltage VAC= (Output voltage +8)/1.414
For example:
±12V DC-OUT,
Input voltage VAC=（12+8)/1.414=14.14VAC, Please choose Dual 15VAC；
±5VDC-OUT Dual 9VAC-IN
±9VDC-OUT Dual 12VAC-IN
±12VDC-OUT Dual 15VAC-IN
±15VDC-OUT Dual 18VAC-IN
±18VDC-OUT Dual 18VAC-IN
±24VDC-OUT Dual 22-24VAC-IN
±30VDC-OUT Dual 26-28VAC-IN
±36VDC-OUT Dual 32VAC-IN
Paket:
1pc Sigma22 Fully Discrete Regulated Power Supply (Dual Rail±5V ～±36V) Kit DIY
