kb81
Newbie level 4
charge pump power supply
How is the soft start circuit for a charge pump power supply IC normally designed? The charge pump I am designing is a voltage doubler. The output is 2X Vin
The load for the charge pump is 100 mA max which means that the switch MOSFETs have to be quite large. The switches are one PMOS and one NMOS connected as an inverter. The output of the inverter is connected to a flying cap and there are two diodes and an output cap. The load is resistive and always present on startup.
Ideally I would like a way to linearly ramp up the amplitude of the gate drive signal. How do I implement this without any timing capacitors?
Any other methods or ideas are also much appreciated.
Thanks for your help!
kb81
How is the soft start circuit for a charge pump power supply IC normally designed? The charge pump I am designing is a voltage doubler. The output is 2X Vin
The load for the charge pump is 100 mA max which means that the switch MOSFETs have to be quite large. The switches are one PMOS and one NMOS connected as an inverter. The output of the inverter is connected to a flying cap and there are two diodes and an output cap. The load is resistive and always present on startup.
Ideally I would like a way to linearly ramp up the amplitude of the gate drive signal. How do I implement this without any timing capacitors?
Any other methods or ideas are also much appreciated.
Thanks for your help!
kb81
