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Power Supply circuits diagram electronics projects

Power Supply circuits diagram electronics projects: battery chargers, switching power supply , ac power supply, dc dc converters, power inverter, converters and power adapters .

12V switching power supply project using LT3844

This 12V switching power supply electronic circuit is based on LT3844 DC DC controller circuit that can be used for medium power devices . The LT3844 IC offers a wide 4V to 60V input range (7.5V minimum start-up voltage)and can implement step-down, step-up, inverting and SEPIC topologies.
This power supply circuit will provide a 12 volts output voltage with a maximum current of 4 amperes . This 12V switching power supply electronic circuit requires an input voltage between 15 and 60 volts . The maximum output power that can be supplied by this circuit is around 50 watts .

D1,D2 can be an 1N4148 type and D3 can be an PDS5100H type .
The T1 transistor used for this project must be an Si7850DP type .
If you want to see more details about how you can to design a power supply circuit using the LT3844 IC ,please consult the manufacturer datasheet .

12V switching power supply electronic circuit project using LT3844 ic

ADP1261 3 to 12 volts converter

This power supply circuit diagram is based on the ADP1261 fixed-frequency, pulse-width modulation (PWM), current-mode, step-up converter controller. It drives an external n-channel MOSFET to convert the input voltage to a higher output voltage. The ADP1621 can also be used to drive flyback, SEPIC, and forward converter topologies, either isolated or nonisolated.

The ADP1621 eliminates the use of a current-sense power resistor by measuring the voltage drop across the on resistance of the n-channel MOSFET. This technique, allowed up to a maximum voltage of 30 V at the switch node, maximizes efficiency and reduces cost.

The input voltage range that is required by the ADP1621controler is from 2.9 V to 5.5 V. Also higher input voltages are possible with the use of a small-signal  NPN pass transistor or a single resistor. The switching frequency is set by an external resistor over a range of 100 kHz to 1.5 MHz and can be synchronized to an external clock by using the SDSN pin. The ADP1621 has a thermal shutdown feature that shuts down the gate driver when the junction temperature reaches approximately 150°C.

The circuit presented here will provide a maximum 12 volts output at a maximum 1 ampere current from an 3.3 volts  input supply voltage .

D2 is a common signal diode , D2 can be a Vishay SSC53L diode and M1 transistor can be IRF7470 .

ADP1261 3 to 12 volts converter circuit diagram

ADP1864 DC DC controller

This power supply electronic circuit is based on the ADP1864 is constant-frequency, current-mode, step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±1.25% accuracy, for up to 5 A load currents, from input voltages as high as 14 V.

The ADP1864 allow accurate setting of the current limit with an external resistor, and the output voltage is easily adjustable using two external resistors. The ADP1864 includes an internal soft start to allow quick power-up while preventing input inrush current. Additional safety features include short-circuit protection, output overvoltage protection, and input undervoltage protection. Current-mode control provides fast and stable load transient performance, while the 580 kHz operating frequency allows a small inductor to be used in the system.
The maximum output voltage that can be provided using this regulator is from 0.8 volts up to input voltage .
Using this circuit diagram you will have at the output  a 3.3 volts at a maximum current of 2 amperes . Also this circuit has a high efficiency up to 94% and is pin to pin compatible with LTC1772 and LTC3801 integrated circuits manufactured by Linear Technology .

ADP1864 DC DC controller circuit schematic


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