Keywords: gate bias, shunt reference, voltage reference, charge pump, voltage doubler, -48V rail, telecom
RMIN = (VIN(MAX) - VREF)/IR(MAX) = (52.8V - 5V)/0.01523A = 3.14kΩ.Choose the next-highest standard 1% value, which is 3.16kΩ.
ICP = (VIN(MIN) - VREF)/R - ISH(MIN) = (43.2V - 5V)/3.16kΩ - 90µA = 12mA,where 90µA is the minimum recommended operating current for the shunt reference. Assuming 90% efficiency in the charge pump, the output current is
IOUT = (ICP/2) × 0.9 = (12mA/2) × 0.9 = 5.4mA.Charge-pump input current is halved, because output voltage is twice the input voltage. Power is dissipated via the shunt reference under no-load conditions, so be sure that R can handle the resulting wattage. A 1W resistor suffices in this case.
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