Simple circuit provides 5V gate bias from –48V: 09/19/2002
EDN - Design Ideas / A small and simple circuit derives 5V
from the -48V rail that telecomm applications typically use
(Figure 1). Useful for gate bias and other purposes, the 5V
supply delivers as much as 5-mA output current. A shunt
reference, IC1, defines -5V as ground reference for a charge
pump, IC2. The charge pump doubles this 5V difference between
system ground and charge-pump ground to produce 5V with res....