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Posts Tagged ‘switching variable regulator’

LM2575 Switching Regulator 1.2-12V for Solar

Here is circuit power supply switching regulator, use IC LM2575 (good and easy IC switching regulator) for cotrol Voltage output 1.2V – 12V From Input Voltage 12V-20V. Detail see in circuit.

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 voltages such as 1.5V, 3V, 4.5V, 6V, 7.5V, and 9V can be produced by this circuit….

Read more in Source: http://www.solorb.com/elect/solarcirc/buckreg1/index.html

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DC to DC converter step up 4.5V-12V to +15V 0.5A

I Find Circuit DC / DC converter for my friend from internet.
One good site at http://www.maxim-ic.com about IC Very nice for electronics user.
I like many circuit in this site.

The MAX668 boost circuit to implement a switch-mode power supply that provides a +15V at 0.5A output from a 4.5V to 12V input. This MAX668 circuit adds a few components to the minimum circuit implementation. C7 adds a pole to compensate for the ESR-zero of the output capacitor. R5 and C8 filter the current-sense voltage to prevent high-frequency switching noise from prematurely tripping the current limit. This functionality is in addition to the MAX668′s internal 60ns current-sense blanking time.

The MAX668 output voltage can be changed to +12V by changing the value of the R2 resistor to 86.6k This change reduces the minimum input voltage to approximately 10V. Since the MAX668 provides internal compensation, no other changes are required for +12V output.

The output ripple voltage due to switching can be reduced an order of magnitude with a secondary output filter set to one-tenth of the switching frequency. A 1, 0.5W resistor in series with a 10uF, 25V capacitor with less than 100m ESR introduces a 0.5V decrease in output voltage at a 0.5A load. The feedback voltage must be sensed before it reaches the secondary filter for the MAX668 to maintain stability.

Read More Source :http://www.maxim-ic.com/appnotes.cfm/an_pk/3943
Good IC DC/DC Converter
Thank you.

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The Output Adjustable Flyback Converter

Circuit : Simon Oh
Email: Simon@SoftSwitching.com

This circuit may also be downloaded in PDF format, please click here.

Description:
A high voltage step-up DC power supply using adjustable flyback conversion.

Specification:
Vin = 220Vac +-10% @ 50/60Hz
Vout =0~600Vdc @ 0.25A
Switching Frequency: 70~100KHz

fig 1

Design Guidelines:
DCM mode, output power is 200W

The input RMS current in worse condition with discontinuous current mode may be calculated as:

If the optimum operating duty cycle is set at D=0.35, then input peak current can be found as:

Therefore the voltage sensing limit voltage level from the FAN7554 data sheet is 1.5V

Source : http://www.zen22142.zen.co.uk/Circuits/Power/oafc.htm

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