Heat dissipation will be approx 750mW across the regulator irrespective
of number of stages. Only adv is heat is divided in many stages
of regulation. Post the circuit schematic of your designed lm317regulator.
Current alone does not generate heat., it should not because only 60mA is drawn!
Hi,
Pass the heat to a transistor around the LM317. Described as High Current Adjustable Regulator, schematic at the bottom of the linked page.
Quite bad suggestion to 'avoid' an SMPS that may not work too well: chop up the 13V with a 555 astable and FET or BJT pass device +smoothing/hold-up capacitors at output before the LM317 to average e.g. 5V out - but no pwm control loop back into the 555 would make Vout unpredictable, maybe. And perhaps Iout may not be sufficient. Lots of 555 pwm circuits to look at, one SMPS with 555 in a Phillips or Signetics application note.
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Calculate desired Vout + dropout voltage at required current + a bit more for ground pin current and motor start/stop draw across top resistor.
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