Hi Folks,
I want to generate an auxilliary negative rail of -60 volts inside of a power amplifier for some biasing experiments that I want to carry out. The problem is that the main +/- 40 volts rails are generated and smoothed in a seperate unit and I don't want to modify that, so I need to generate it from one of the existing D.C. rails and in the power amp case. I don't need a lot of current, 5 to 10mA at mos,t and referenced to the same 0 Volt line as the main rails so it sits 20 volts below the negative rail.
The best way I have come accross so far is to pad down the + 40 to about 15 volts or so and use that to power a 555 timer running as an oscillator and then use a charge pump/ x4 voltage muliplier/inverter on the output to get down to - 60 volts or so. I could then use a zener or shunt regulator to stabilise it.
Buck/boost regulators don't seem to have the capability of getting down to -60 Volts.
Does anyone have any other ideas or better ways to do it?
Thanks and regards
Mike
I want to generate an auxilliary negative rail of -60 volts inside of a power amplifier for some biasing experiments that I want to carry out. The problem is that the main +/- 40 volts rails are generated and smoothed in a seperate unit and I don't want to modify that, so I need to generate it from one of the existing D.C. rails and in the power amp case. I don't need a lot of current, 5 to 10mA at mos,t and referenced to the same 0 Volt line as the main rails so it sits 20 volts below the negative rail.
The best way I have come accross so far is to pad down the + 40 to about 15 volts or so and use that to power a 555 timer running as an oscillator and then use a charge pump/ x4 voltage muliplier/inverter on the output to get down to - 60 volts or so. I could then use a zener or shunt regulator to stabilise it.
Buck/boost regulators don't seem to have the capability of getting down to -60 Volts.
Does anyone have any other ideas or better ways to do it?
Thanks and regards
Mike