Step Up Voltage Converter | Electronic Project Circuits

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12v to 18v DC Converter by LT1170

The supply works by shorting the inductor across the 12 volts through the regulator. This stores energy in the inductor. When the internal switch in the LT1170 goes off, the inductor is placed in series with the 12 volts, adding to it. This voltage pulse is stored in the output capacitor and smooths the output. The diode is used to keep the output capacitor from discharging during switching.
It contains a 100 khz current based oscilator whose output is controled by feedback provided by R1 and R2. These make a voltage divider such that at the wanted output voltage there is 1.24V at the junction of these two resistors. They carry only 1 ma of current and are there to provide a reference voltage to an op amp in the IC. As you draw more current from the output the total voltage would drop as would the 1.24v reference signal. The op amp feeds this to the oscillator telling it to provide more current to fill the demand. This brings the voltage up to 1.24v reference or 18 output. Reduce the load and the opposite happens.

Part list:
L1 inductor 100 µH Hurricane HL-AK210Q
Coiltronics PL52E-100-5000 must handle at least 3 amps
C1 capacitor 56 µf
33 µf Nichicon x1 UPL1E330MAH 25V ESR=.800 Irms=.155A
C2 capacitor 330 µf
390 µf Nichicon x2 UPL1V391MPH 35V ESR=.028 Irms=2.440A
Cc capacitor 1 µf
LT IC switching regulator Linear Technologies LT1170CT data sheet
D1 Schottky 5A Motorola 1N5824
1N5821 Any high speed diode that can handle the power would do. Schottky type is best but not absolutely required.
R1 resistor 16.7k; 1% R1 and R2 set the output voltage; The ratio of R1 to R2 should be 13.5 to 1.
R2 resistor 1.24k; 1%
Rc resistor 1k

Read More Source:http://obs.nineplanets.org/meade/1812/1812.html
Thank you.

Be the first to comment - What do you think? Posted by admin - February 27, 2008 at 12:10 am

Categories: DC converter, Switching power supply Tags: dc converter circuit, step up voltage converter, Step up voltage converter ic

5VDC to +12V and -12V Isolated dual power supply

This is circuit Isolated dual power supply OR DC to DC Converter Circuit. Input Voltage 5V,Output Voltage +12V and -12V.

Detail:
diode should be fast recovery type, for less than 100mA use 1N4148. transformer, pri-20-20, sec-60-60, a SWG-AWG to suit the current you design for.

Any fast switching transistor would work, no regulation, use regulators like 78L12 if you want, circuit like multivibrator used for flashing LED lights.
Dell GX620 Power supply
Source:http://www.electronics-circuits.com/schematics/arc20050724.html
Thank you.

Be the first to comment - What do you think? Posted by admin - September 14, 2007 at 11:03 pm

Categories: DC converter, Switching power supply Tags: 12 volt converter, 5v to 12v dc converter, dual power supply, step up voltage converter

One 9V battery gives +18, +25, +33V

For you high-voltage minibooster fans out there, here’s the one-chip, one battery way to do it.

The MAX1044 is a charge pump converter - it uses a capacitor as a “bucket” to pump charge from one place to another. Normally, there is a capacitor connected from pin 2 of the 1044 to pin 4. This capacitor is charged between +9V and ground, and then switched in parallel with a capacitor from pin 5 to ground in a way that makes a negative voltage on the second cap.

Read more Source : http://www.geofex.com/circuits/+9_to_33.htm