This 12V DC 500mA electronic project is based on the NCP4629 low drop out regulator manufactured by ON Semiconductor . This NCP4629 is a CMOS 12V DC 500mA low drop out regulator which features a high input voltage range while maintaining a low quiescent current. Several protection features like current limiting and
thermal shutdown are fully integrated to create a versatile and robust device.
The NCP4629 regulator is available in three output voltages configurations that will provide an output voltage range between 3 and 12 volts .
A high maximum input voltage (36 V) and wide temperature range (−40°C to 105°C) makes the NCP4629 an ideal choice for high power industrial applications.
A 470 nF ceramic input decoupling capacitor should be connected as close as possible to the input and ground pin of the NCP4629.
A 10 uF ceramic output decoupling capacitor is sufficient to achieve stable operation of the IC.
The enable pin CE may be used for turning the regulator on and off. The IC is switched on when a high level voltage is applied to the CE pin.
The IC includes internal thermal shutdown circuit that stops operation of regulator, if junction temperature is higher than 160°C. After that, when junction temperature decreases below 135°C, the operation of voltage regulator would restart.
A very simple 5 volt power supply circuit project can be designed using the LTM8021 and will provide a maximum current up to 500mA. Almost all required parts are included in the package : switching controller, power switches, inductor, and all support components. This 5 volt power supply circuit based on the LTM8021 operate over a input voltage range between 3V and 36V .
The LTM8021 supports an output voltage range of 0.8V to 5V, set by a single resistor. Only an output and bulk input capacitor are needed to finish the design.
Some features provided by the LTM8021 step-down regulator are :
wide input voltage range, 500mA output current ,fixed 1.1MHz switching frequency ,current mode control, programmable soft-start .
Why to use this type of voltage regulator instead of a common three terminal voltage regulator ? because this regulator circuit project can be used over a wide range input voltage and it has a high efficiency , providing a high accurate output voltage and many other features using few external electronic parts .
A very simple 5 volts switching power supply electronic project can be designed using the LT3511 high voltage monolithic switching regulator manufactured by Linear Technology , specifically designed for the isolated flyback topology.
No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a
240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.