In one of my circuit, the incoming variable voltage(8.5-24V DC) from the source will be first stepped up to 17V using a boost converter. The same output shall then be stepped down to different voltages for driving PMDC Motors:
- Motor: 15.5V, current consumption 1.25A
Motor: 11V, current consumption 800ma
Following options are available:
(1). Single boost supply followed by two buck regulators.
(2). Two boost supplies followed by their respective buck regulators.
(3). Single boost supply followed by single buck regulator that steps down to 15.5V, and then followed by the other linear regulator that steps down to 11V for driving second motor.
The voltage drop from 17V to 15.5V is unavoidable due to diode and other losses. Considering the cost and durability, which option is the best?