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Multiple output DC to DC converter

Former Member

Hi everybody.

 

I am working on a Arduino project using H-bridge (L293D) to drive two motors and I would like to have my project to be powered by an unique power source.

I have an AC/DC power supply that is outputting ~16V at ~1000mA and I am wondering if it is possible to get a stable +5V for the Arduino and the remaining for the motors via the H-Bridge

 

Is It possible and how to achieve that ? voltage divider (going down from 16V to 5V seems a waste) ?

 

Thx in advance for any help you can bring

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  • Hi Cedric,

    I would use a 7805 voltage regulator IC to drop the power down to 5 volts for the Arduino. While you are correct that the drop from 16 to 5 volts will require that some energy be dissipated by the regulator it should be no problem as the power handling of a 7805 will exceed the output power of your AC Adapter. The Arduino will use different amounts of current depending on the coding and the circuits that you are driving with its output pins. A 100mA draw from the Arduino would require the 7805 to dissipate 1.1 Watts. It would probably be best if you heat sink the 7805. Keep an eye on your over all power consumption as your power supply with 16 volts and 1000 mA has about 16 Watts that it can supply. Your motors and H bridge circuitry will have to be factored in.

    John

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  • Hi Cedric,

    I would use a 7805 voltage regulator IC to drop the power down to 5 volts for the Arduino. While you are correct that the drop from 16 to 5 volts will require that some energy be dissipated by the regulator it should be no problem as the power handling of a 7805 will exceed the output power of your AC Adapter. The Arduino will use different amounts of current depending on the coding and the circuits that you are driving with its output pins. A 100mA draw from the Arduino would require the 7805 to dissipate 1.1 Watts. It would probably be best if you heat sink the 7805. Keep an eye on your over all power consumption as your power supply with 16 volts and 1000 mA has about 16 Watts that it can supply. Your motors and H bridge circuitry will have to be factored in.

    John

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