Dc Converter Ic | Electronic Project Circuits

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Switching Regulator 0.5A by LM2574

The LM2574 series of regulator 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.

Output Current 500 mA
InputMin Voltage 4 Volt
InputMax Voltage 60 Volt
Output Min 3.3, 1.23, 12, 15, 5 Volt
Output Max 57, 3.3, 12, 15, 5 Volt
Frequency Min 52000 Hz
Frequency Max 52000 Hz
Efficiency 88, 77, 72 %

Applications
-Simple high-efficiency step-down (buck) regulator
-Efficient pre-regulator for linear regulators
-On-card switching regulators
-Positive to negative converter (Buck-Boost)

Read More Source:http://www.national.com/mpf/LM/LM2574HV.html
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Be the first to comment - What do you think? Posted by admin - October 5, 2007 at 5:59 pm

Categories: DC converter, Switching power supply Tags: dc converter ic, dc converter step down voltage, switching regulator

SG3525 DC Converter 12V to +35V,-35V

SG3525 DC/DC Converter 12V to +35V,-35V Switchmode Power Supply For Car Audio

The selected switching topology is called a “push-pull” converter, because the transformer has a double primary (or a “centre-tapped” one, if your prefer). The centre tap is permanently connected to the car battery (via an LC filter to avoid creating peaks in the battery lines, which could affect other electronic equipment in the car). The two ends of the primary are connected to a pair of paralleled MOSFETs each that tie them to ground in each conduction cycle (Vgs of the corresponding MOSFET high).

These MOSFETs should be fast, able to withstand high currents (in excess of 30A each if possible) and have the lowest possible Rds(on). The proposed On-Semiconductor?s MTP75N06 can withstand 75Amp and has a Rds(on) below 10 milliohm. This is important, because the lower this resistance is, the less power they are going to dissipate when switching with a square waveform. Another alternatives are MTP60N06, or the more popular BUZ11 and IRF540.

Although the schematics show a previous bipolar push-pull stage, you can also connect the gate resistor directly to the output of the controlling IC, leaving out the transistors, as the SG3525 is capable to drive up to 500 mA (theoretically), more than enough to switch the MOSFETs fast.

These MOSFETs should be fast, able to withstand high currents (in excess of 30A each if possible) and have the lowest possible Rds(on). …

Source:http://sound.westhost.com/project89.htm
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