S
Steve Kavanagh
- Jan 1, 1970
- 0
I have a piece of equipment that runs from a -24V (nominal) supply. I
would like to add to it a circuit that requires +8V regulated at about
250mA. I am concerned that the magnetic field from a regular switcher
(with inductor) could upset (modulate) a couple of oscillators in the
equipment. So I'm wondering about using a switched capacitor circuit,
followed by an LDO regulator.
I've convinced myself that both voltage-halving (as can be done with
the 7660 at lower V/I) and voltage inversion can be done in the same
circuit. But I am concerned that voltage drops in the bipolar/diode
circuit I have in mind could be excessive. I haven't found any sign
of monolithic devices that can handle this voltage/current
combination. Are there any readily available rail-to-rail-output
op-amps or drivers that will work at -24V supply ?
Has anyone any clever suggestions for an efficient, simple, economical
(in Qty.1) circuit ?
Steve
would like to add to it a circuit that requires +8V regulated at about
250mA. I am concerned that the magnetic field from a regular switcher
(with inductor) could upset (modulate) a couple of oscillators in the
equipment. So I'm wondering about using a switched capacitor circuit,
followed by an LDO regulator.
I've convinced myself that both voltage-halving (as can be done with
the 7660 at lower V/I) and voltage inversion can be done in the same
circuit. But I am concerned that voltage drops in the bipolar/diode
circuit I have in mind could be excessive. I haven't found any sign
of monolithic devices that can handle this voltage/current
combination. Are there any readily available rail-to-rail-output
op-amps or drivers that will work at -24V supply ?
Has anyone any clever suggestions for an efficient, simple, economical
(in Qty.1) circuit ?
Steve