boost converter circuit for digital

Posted on Feb 5, 2014

This is a design circuit for converter that using for a very practical LM2623A ratio adaptive circuit to drive a digital camera motor. It produces 5 volts from input voltages ranging between 1. 8 and 4. 5 volts. This is the figure of the circuit; The duty cycle is not shown, but it varies from about 86% at 1. 8 volts in to 71% at 4. 5 volts in. Mainta

boost converter circuit for digital
Click here to download the full size of the above Circuit.

ining the 86% duty cycle at 4. 5 volts would reduce the efficiency and increase the ripple. Maintaining the 70% duty cycle at 1. 8 volts would significantly reduce the output capability. Several camera manufacturers are already requiring 1. 8 to 4. 5 volt operation from all the power supplies. The 1. 8 to 4. 5 voltage standard allows a manufacturer to build his product and let the user select disposable Alkalines, Ni-MH or Li-Ion at the point of purchase.

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