20-36Vin to 12Vout @ 16A 2-Phase Low Noise EN55022B Compliant uModule Power Supply

The LTM4613 is a complete, ultralow noise, 8A switch mode DC/DC power supply. Included in the package are the switching controller, power FETs, inductor and all support components. Operating over an input voltage range of 5V to 36V, the LTM4613 supports an output voltage range tl431c lm1875t AT24c512 tda8177 bt138 stk4152II l293b cd40106B of 3.3V to 15V, set by a single external resistor. Only bulk input and output capacitors are needed to finish the design.

Non-isolated AC to DC power supply

This simple power supply circuit can reduce any voltage from 20vac to 120vac into 5 volts DC and can provide current up to 100mA.

Switch-Mode Power Supply

National Semiconductor has been producing and designing ICs for use in switch-mode power supplies for many years. The application of these devices is normally straightforward, helped by the excellent documentation that is available. A typical example of a switch-mode power supply is that based on the LM2671 or LM2674. The components for it are available for outputs of 3.3 V, 5 V and 12 V. There is also a version providing a presettable output voltage. Within the specified application, the supplies can deliver currents of up to 500 mA. Note-worthy is the high switching frequency of 260 kHz.

Circuit diagram:

Switch-Mode Power Supply Circuit Diagram

This has the advantage that only low-value inductor and capacitors are needed, and this results in excellent efficiency and small dimensions. In normal circumstances, the efficiency is 90% and may even go up to 96%. Both ICs provide protection against current and temperature overloads. The LM2671 has a number of additional facilities such as soft start and the option to work with an external clock. The latter enables several supplies to be synchronized so as to give better control of any EMC (ElectroMagnetic Compatibility). The application shown in the diagram provides an output voltage of 5 V and an output current of up to 500 mA. Diode D1 is a Schottky type (Uco≥ 45 V and Imax≥ 3 A).
http://www.hqew.net/circuit-diagram/Switch$2dMode-Power-Supply_12732.html

1,5 to 30V 5A power supply

Variable 1,5-to-30V-5A power-supply schematic

The schematic diagram come from circuit: Simple Variable Power Supply 1.5 – 30V, 5A power supply. Go to that page to read the explanation about above power supply related circuit diagram.

Symmetrical regulated power supply and variable 0 to 30V 2A
This Symmetrical regulated power supply and variable power supply 0 to 30V 2A circuit does not require further explanation, which is a controlled variable symmetric source, can deliver up to 15V per line (-15 and 15), or up to 30V ...

Variable Zener Diode
This circuit acts like a zener diode with a wide range of voltages. The current passing via the voltage divider R1-R2 is substantially greater compared to the transistor base current and is in the region of 8 ma. The stabilizing ...

Variable Power Supply with Adjustable Current Limit
This circuit variable power supply with adjustable current limit using three terminal adjustable regulator LM117 which is used to regulate current and the voltage limits. Variable power supply input range is between 32 V to 40 VDC and can provide ...

Variable Voltage Regulator based LM117
The regulator circuit uses an LM117K three-terminal adjustable output positive voltage regulator in a TO-3 can. The variable voltage regulator lets you adjust the output voltage of a fixed DC power supply between 1.2 and 37 VDC, and will supply ...

A1015   CP2102 DS18B20 AD620  LM1117
Simple Variable Power Supply using L4960
Modern circuit design and chip manufacturers make life easier for the designer's great-for example, when creating a power source. We demonstrate this on a chip factory L4960. The documentation on it is possible to produce regulated power supply with an ...

Precise Low Voltage Power Supply   This power supply eliminate voltage loss on current meter. Will be designed for measure on low voltage DC/DC converters (e.g. LED lamps powered from single NiCd/NiMH cell)

12 volt power supply using LT3845

Using the LT3845 is high voltage, synchronous, current mode controller can be designed a high efficiency 12 volt power supply .
An onboard regulator simplifies the biasing requirements by providing IC power directly from VIN.
Burst Mode operation maintains high efficiency at light loads by reducing IC quiescent current to 120μA. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation.

Additional features include adjustable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, 10μA shutdown current, short-circuit protection and a programmable soft-start.
This 12 power supply project will require an input voltage range between 20 and 55 volts and will deliver a maximum output power of 75 watts at 12 volts output voltage .
Using the LT3845 high voltage controller you can design various power applications , because this controller accepts a wide input voltage range between 4 and 60 volts and can provide a maximum output voltage around 36 volts . Also LT3845 has an adjustable constant frequency from 100kHz up to 500kHz .
Source: http://www.hqew.net/circuit-diagram/12-volt-power-supply-using-LT3845_7283.html

How to build 10 Amp 13.8 Volt Power Supply

Circuit diagram

Description

Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price. Of course rolling our own gives us the ability to customize the circuit and make it even more reliable than commercial units. The circuit in Figure 1 will give us 10 amps (12 amps surge) with performance that equals or exceeds any commercial unit. The circuit even has a current limiting feature which is a more reliable system than most commercial units have. Just like other commercial units, this circuit uses the LM723 IC which gives us excellent voltage regulation. The circuit uses 3 pass transistors which must be heat sinked. Resistor R9 allows the fine tuning of the voltage to exactly 13.8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 limits the current when the voltage drop across R5 approaches .7 volts. To reduce costs, most commercial units rely on the HFE of the pass transistors to determine the current limiting. The fault in that system is that the HFE of the pass transistors actually increases when the transistors heat up and risks a thermal runaway condition causing a possible failure of the pass transistors. Because this circuit samples the collector current of the pass transistors, thermal runaway is not a problem in this circuit making it a much more reliable power supply. The only adjustment required is setting R9 to the desired output voltage of anywhere between 10 and 14 volts. You may use a front panel mounted 1K potentiometer for this purpose if desired. Resistor R1 only enhances temperature stability and can be eliminated if desired by connecting pins 5 and 6 of IC-1 together. Although it really isn’t needed due to the type of current limiting circuit used, over voltage protection can be added to the circuit by connecting the circuit of Figure 2 to Vout. The only way over voltage could occur is if transistors Q2 or Q3 were to fail with a collector to emitter short. Although collector to emitter shorts do happen, it is more much more likely that the transistors will open up when they fail.
I actually tested this and purposely destroyed several 2N3055’s by shorting the emitters to ground. In all cases the transistors opened up and no collector to emitter short occurred in any transistor. In any event, the optional circuit in Figure 2 will give you that extra peace of mind when a very expensive radio is used with the power supply. The circuit in Figure 2 senses when the voltage exceeds 15 volts and causes the zener diode to conduct. When the zener diode conducts, the gate of the SCR is turned on and causes the SCR to short which blows the 15 amp fuse and shuts off the output voltage. A 2N6399 (Tech America) was used for the SCR in the prototype but any suitable SCR can be used. While over voltage protection is a good idea, it should not be considered a substitute for large heat sinks. I personally feel the best protection from over voltage is the use of large heat sinks and a reliable current limiting circuit. Be sure to use large heat sinks along with heat sink grease for the 2N3055 transistors. I have used this power supply in my shack for several months on all kinds of transceivers from HF, VHF to UHF with excellent results and absolutely no hum. This power supply will be a welcome addition to your shack and will greatly enhance your knowledge of power supplies.

DE N1HFX

Parts

• R1 1.5K ? Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)
• R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)
• R4 270 Ohm ? Watt Resistor
• R5 680 Ohm ? Watt Resistor
• R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)
• R8 2.7K ? Watt Resistor
• R9 1K Trimmer Potentiometer (RS271-280)
• R10 3.3K ? Watt Resistor
• C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)
• C5 100 Picofarad Ceramic Disk Capacitor
• C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)
• IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.
• Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)
• Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)
• S1 Any SPST Toggle Switch
• F1 3 Amp Fast Blow Fuse
• D1-D4 Full Wave Bridge Rectifier (RS276-1185)
• T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Tech America 900-5825)ALD1701ASAL AD9212BCPZ-40 LCM-S01602DSR/B UPW50B20KV ADF4113HVBRUZ UC3863DWG4 LM311PWG4  IRL1404PBF

BZV55B16

How to build Power Supply 50V 3A stabilized and regulated

Description

Many times we needed a stabilized, together regulated power supply and high relatively output voltage. These specifications him it cover our circuit. It 's a circuit that can give in his exit 40V until 60V 3A, with simultaneous stabilization. The materials that use is very simple and will not exist difficulties in the manufacture, is enough you are careful certain points. 1 ] For output voltages smaller of 50V until 40V, the Q1 is hot enough, so that it needs one big heatsink. 2]For output voltages bigger of 50V up to 70V, the stabilization is not satisfactory. Conclusion: ideal output voltage is 45V until 60V. In the circuit pontesometer RV1, is used in order to we change the output voltage between 40V until 70V, we can however and perhaps it should, him we replace with two constant resistors, when finishe the regulation, in the desirable price. The reason is, that with time is presented change of output voltage, up to 3V, with connected pontesometer. ATTENTION!!! The positive exit correspond in point [ A ] and the exit of 0V in point [ B ], which should not be connected in the ground.
ZY100    HMNR1288D-85I    5960-09    12L2828    VJ1206A272FXBMT    SP54HC82   

Circuit diagram

Part list

• R1=10Kohm
• R2=1 ohm 5W
• R3=3.9 ohms 1W
• R4=6.8Kohm 1W
• R5=390 ohms 1W
• R6=100Kohm 0.5W
• R7=1.2Kohm 1W
• R8=1.8Kohm 0.5W
• R9=3.3Kohm 0.5W
• RV1=470 ohms pot.
• C1-2-4=4700uF 100V
• C3-5=100nF 250V MKT
• Q1=2N3055 on heatsink
• Q2=BD162 or BD243 or BD543
• Q3=BC303 or BC461
• D1....4=Bridge 15A
• D5=LED RED 5mm
• D6-7=10V 1W Zener
• D8-9-10=1N4007
• T1=230Vac / 55V 3A

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