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Switching regulator

5V Supply Derives Power From 3-Wire RS-232 Port
2007-09-07 18:47:00
The circuit of Figure 1 produces a semi-regulated 5V output from an RS-232 port. Unlike a PC-mouse supply or comparable circuits that rely on the modem-control signals DTR and RTS, this one operates with a 3-wire port (GND, Rx, and Tx), and obtains power only from the Tx line. (Except at high duty cycles, the ...
Power Supply derives 5 and 3.3V from USB port
2007-09-07 18:32:00
Design Ideas / The circuit in Figure 1 derives its power from a USB port and produces 5 and 3.3V supply rails for portable devices, such as digital cameras, MP3 players, and PDAs. The circuit allows the port to maintain communications while, for example, charging a lithium-ion battery. IC2 boosts the ...
LM2678 DC to DC step down voltage regulator.
2007-09-07 13:31:00
LM2678 (5A)DC to DC step down voltage regulator.(Switching power supply regulator) Wide input voltage 8Vdc to 40Vdc. Part number: - LM2678-3.3 (3.3Vdc output) - LM2678-5.0 (5Vdc output) - LM2678-12 (12Vdc output) - LM2678-ADJ (1.2Vdc to 37Vdc output) Component list - 45uF 50V electrolytic capacitor - 0.47uF - 6TQ045S high speed schottky diode - Output 100V electrolytic ...
250 W S.M.P.S. with Power FETs (link)
2007-09-03 15:59:00
Experiments with the PC power supply encouraged me to produce an “improved” design. Like the original design, the new power supply is also a forward converter with a half-bridge topology. The differences to the modified PC power supply consist of the following items: 1) two power FETs are used instead of bipolar transistors as power ...
0-30 VDC Stabilized Power Supply With Current Control 0.002-3A
2007-09-01 18:49:00
 0-30 VDC Stabilized Power Supply With Current Control 0.002-3A - This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few milliamperes (2 mA) to the maximum ...
LM2675 5.0EVAL 1 Amp Step Down High Efficiency Simple Switcher(link)
2007-08-28 18:56:00
LM2675 5.0EVAL 1 Amp Step Down High Efficiency Simple Switcher Evaluation Board: National Semiconductor Application power supply regulator, switching power supply, Switching regulatorShare This
LM2577 Three Output, Isolated Flyback Regulator (link)
2007-08-28 18:54:00
LM2577 Three Output, Isolated Flyback Regulator: National Semiconductor Application power supply regulator, switching power supply, Switching regulatorShare This
LM2597HV - SIMPLE SWITCHER Power Converter Step-Down Voltage Regulator
2007-08-23 17:25:00
I like circuit power supply, See to more website. This is IC LM2597HV (Good IC Step-Down Voltage Regulator) Intro detail: The LM2597/LM2597HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. 3.3V, 5V, 12V, and ...
LM2575 Switching Regulator 1.2-12V for Solar
2007-08-20 15:12:00
  This circuit is suitable for a variety of uses. If you have a solar powered 12 Volt lead-acid battery power source, the circuit can be used to efficiently power lower voltage devices. It can be used to provide power to devices that normally use a set of small batteries for power. Common ...
13.8V, 40A Switching Power Supply By LM3524 and LM324
2007-08-19 08:55:00
This is circuit 13.8V, 40A Switching Power Supply, It is high current power supply switching regulator. And Nice Circuit for power user. _______________________________- By Manfred Mornhinweg, XQ2FOD This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur’s Handbook, 1999. Visit the American Radio Relay League ...
circuit dc to dc converter 12V to +/- 30V for car with IC SG3525
2007-08-18 22:02:00
This is circuit Dc to DC Converter for Car Amplifier, Input 12V to Out +30V and -30V for Preamp or Power Amplifier. use IC SG3525 and Mosfet,Circuit Switching supply. I copy from forum : Thank you Converter circuit, dc to dc converter, dc to dc converter step up voltage, switching power supply, Switching regulatorShare This
MJ2955 Switching Power Supply 12V 10Amp
2007-08-16 08:51:00
The switching power supply provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. With reference to the schematic, the front panel power-on light is not shown. There is no adjustable current limiter in this unit, although R1, R2, R3, Q2, R8, R9, ...
Modify power supply computer 230W For 13.8V 20Amp
2007-08-05 17:21:00
 Modify power supply computer 230W For 13.8V 20Amp “Opened up a whole bunch of SMPS (around 12) from different manufacturers and carefully examined them. The worst power supply was a Chinese made brand which advertised a 250 watt rating together with 5 volts at 25 amps on the cover plate but on examination ...
Tripler Converts 5V to 15V by MAX1983
2007-08-02 09:35:00
By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V (Figure 1). A 15V rail is useful for powering op amps, LCD-bias circuits, and other low-current applications. The connections shown configure the IC1 voltage doubler as a tripler. The no-load output voltage of the circuit is approximately 3VIN -2VD, ...
POWER SUPPLY Switching 12V for CAR by SG3525
2007-08-01 16:57:00
Switchmode Preamp Supply For Cars DescriptionThe extreme simplicity of this design is thanks to the circuitry inside the SG3525 controller IC. The two outputs have dual switching transistors, and these can be used to create a full bridge forward converter switchmode supply with the absolute minimum of external parts. As shown in Figure 1, the supply ...
13.8 V - 15 A from a PC Power Supply
2007-07-31 20:39:00
The major disadvantages of usual linear power supplies are high power dissipation, the size and the appropriated weight. When looking for an alternative solution, I decided to use a switch mode power supply (SMPS). The efficiency of such power supplies is around 70 % to 90 % at a power density of 0.2 W / ...
MAX756 2.5V-3.5V to 5V Step-Up DC-DC Converter
2007-07-25 21:25:00
Build a circuit to boost the voltage of a DC power source using a MAX756 IC Chip A DC voltage booster, DC voltage multiplier, or DC-DC Step-Up Converter is a very useful tool which enables a low source DC voltage to be boosted (stepped up) to a higher output DC voltage which is more useful. For ...
A low cost step-up converter by IC 555
2007-07-21 11:53:00
This is a power source that creates a DC voltage higher than the voltage feeding the it. It might be used to power your laptop (+18V) from a car battery (12V ~ 13.8V). It is built using very ordinary parts that should be readily available. Here are some specs: Input voltage 9V ~ 15V Output voltage 12V ~ 25V Output ...
regulator switching DC to DC step down Voltage with LM2596
2007-07-20 18:01:00
DC to DC step down voltage regulator 3A Wide input voltage 8Vdc to 40Vdc. Part number: - LM2596-3.3 (3.3Vdc output) - LM2596-5.0 (5Vdc output) - LM2596-12 (12Vdc output) - LM2596-ADJ (1.23Vdc to 37Vdc output) Component list - 680uF 50V electrolytic capacitor - 1N5824 high speed schottky diode (5A) - Output 100V electrolytic capacitor ...
DC to DC step up voltage regulator by LM2577
2007-07-18 12:21:00
LM2577 (3A) switching power supply DC to DC step up voltage regulator. Wide input voltage 3.5Vdc to 40Vdc. Part number: - LM2577-12 (12Vdc output) - LM2577-15 (15Vdc output) - LM2577-ADJ (1.23Vdc to 37Vdc output) dc to dc converter, switching power supply, Switching regulator, UncategorizedShare This
circuit power supply regulator switching 0-50V 5A by TL494 , MJ15004
2007-07-18 12:08:00
circuit power supply regulator switching 0-50V 5A by TL494  , MJ15004 power supply, switching power supply, Switching regulator, TL494Share This
Simple switching regulator by LM358 , 78L05
2007-07-13 10:23:00
This circuit uses a standard 78L05 low power 5v regulator in a novel way - as a voltage reference to a comparator. When the output voltage is LOWER than 5v, the output of the comparator switches high, turning on the transistor. The output voltage rapidly rises and once it is HIGHER than 5v, the output ...
Simple Switching Regulator 5V by MPS6726
2007-07-13 04:23:00
When batteries are used to power lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs that can do the job with great efficiency and small size. An example is the Maxim ( MAX639 which converts inputs from 5.5 to 11.5 volts to 5 volts at up to 225mA. ...
Circuit DC to DC converter to step up input voltage
2007-07-10 19:34:00
This is a simple circuit which outputs a voltage which is more than the input. This could be used to power 12v or 9v devices from a 6v system, or even 6v devices from a 1.5v battery (see below) Source : Power supply circuit, Switching regulatorShare This
Simple switching regulator Stepdown Voltage
2007-07-09 16:46:00
The 74C14/40106 schmitt trigger inverter is powered through a 78L05 +5v series regulator. so that the input switching points remain constant regardless of the input voltage. A schmitt trigger input typically switches ON at 2/3rds the supply voltage, and OFF at 1/3rd the supply voltage. For a 5v supply the on and off points are about ...
DC12V to DC28V Converter with LM2585
2007-07-08 18:45:00
This circuit is boost regulator, input volt DC12V for output DC28V (28v relay) The circuit is built around the LM2585, and uses the energy stored in an inductor to boost the 12v to 28. The circuit does it’s switching around 100 Khz, but generates no noise if SMT components are used. Note 1. A short-circuit on the output ...
Circuit power supply computer 230W 220V
2007-07-07 07:25:00
Here circuit power supply for computer 230W 220V. it use IC TL494 and Transistor. Out put 5V , 12V circuit com, Power supply circuit, switching power supply, Switching regulator, TL494Share This
Switching Power Supply by IC UC3843 + IRF740
2007-06-26 10:51:00
This is a Somewhat Experimental Circuit and I Especially designed this circuit for those persons that want to Dabble in Switching Power Supply Designs. This Circuit is based on a UC3843 Integrated Circuit. It does Not allow for Feedback control of the output voltage. The output voltage is totally determined by the “Turns Ratio” in Transformer ...
2007-05-30 11:06:00
Source :: This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W.Device use push-pull transistor circuit with regulation of output voltage. Line voltage goes through input filter circuit (C1, R1, T1, C4, T5) to the bridge rectifier. When voltage is switched from 230V to 115V, ...
Simple 5V 1A Switching regulator by IC LM2575-5.0
2007-05-23 11:44:00
The switching regulator which used LM2575-5.0 in this page. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the ...
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