Showing posts with label adjustable. Show all posts
Showing posts with label adjustable. Show all posts
Wednesday, June 12, 2013
10A Adjustable voltage Regulator MSK 5012
MSK5012 is a highly reliable adjustable voltage regulator.Whose output can be programmed using two resistors. The regulator has a very low dropout voltage(0.45v @10A )due to the usage of MOSFET with very low Rds (ON) as the internal series pass element.The MS5012 has a high level of accuracy and ripple rejection is around 45dB. It is available in a 5 pin Sip package that is electrically isolated from the internal circuitry. This give us the freedom to fit the IC directly to the heat sink and this sort of direct heat sinking improves the thermal dissipation.
Description.
The output voltage of this circuit is adjustable from 1.3v to 36v DC.Resistors R1 and R2 are used for programming the output voltage.For all applications, value of R2 is fixed to 10K. The relationship between R1,R2 and output voltage Vout is according to the equation R1=R2(Vout/1.235)-1. C1 is a filter capacitor which is also a part of the gate drive circuit of the internal series pass MOSFET. Around three times the input voltage will appear across this capacitor and so the its voltage rating must be selected accordingly.C2 is the input filter capacitor while C3 is the output filter capacitor.
Circuit diagram.
Notes.
- Input voltage 3v to 36v DC.
- Output voltage range 13v to 36v DC.
- Typical application of MSK5012 are high efficiency linear regulators, constant voltage/current regulators, system power supplies etc.
- A heat sink with thermal resistance not more than 2.40 oC/W must be fitted to the MSK5012.
- Resistance R2 is fixed at 10 K for all applications.
- Quiescent current of MSK5012 is around 10mA.
Sunday, March 31, 2013
Adjustable 3 Ampere Regulator
By combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulator can be constructed in a very simple manner that works very well. The output voltage is adjustable up to 20 V, with a maximum current of 3 A. Since the TDA2030 comes complete with a good thermal and short-circuit protection circuit, this adjustable regulator is also very robust. As illustrated by the schematic, the design of this circuit is characterized by simplicity that is hard to beat. In addition to the two ICs, the regulator contains actually only two potentiometers and a few capacitors.
The adjustment is done by first turning potentiometer P1 to maximum (wiper to the side of the 78L05) and subsequently turning trimpot P2 until the desired maximum output voltage is reached. P1 is then used to provide a continuously adjustable voltage between this maximum and nearly zero volts. At relatively small output currents there are no specific requirements regarding the cooling. However, when the output current exceeds 1 A, or if the input to output voltage difference is quite large, the amplifier IC has to dissipate too much power and a small heatsink is certainly appropriate.
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The adjustment is done by first turning potentiometer P1 to maximum (wiper to the side of the 78L05) and subsequently turning trimpot P2 until the desired maximum output voltage is reached. P1 is then used to provide a continuously adjustable voltage between this maximum and nearly zero volts. At relatively small output currents there are no specific requirements regarding the cooling. However, when the output current exceeds 1 A, or if the input to output voltage difference is quite large, the amplifier IC has to dissipate too much power and a small heatsink is certainly appropriate.
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