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A voltage divider will be anything that divides the voltage , not just two resistors but also a zener , a transistor or anything
that can be used in a linear voltage "regulator", all the designs are based an a pass element that introduces a voltage drop and keeps the output level to a constant level,
this is based on a voltage divider.
The only solution that doesn't use a voltage divider is a pulse psu because it is either on (full voltage) or off,
the duration of the on time adjusts the output voltage level.
I suggest you to use IC 34063 for these application...
The IT34063 is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. This device was specifically designed to be used in Step-Down, Step-Up and Voltage-Inverting applications with a minimum number of external components.
if you have any queries please do not hesitate to ask
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