Actually i want to switch OFF the output of DC-DC converter i.e TPS61088EVM-677According to this data sheet you should apply a Vgs of at least -1.5V to turn it ON and a Vgs of <0.4V to turn it OFF.
If the MOSFET source is connected to a plus voltage of 3V to 4.2V then you need to add a NPN transistor buffer stage from the controller output to the MOSFET gate.
Connections are:
Controller to resistor to NPN base.
NPN emitter to common.
NPN collector to (second) resistor to +ve rail.
MOSFET gate to NPN collector.
The MOSFET will turn on when the controller output is 3V.
How fast do you need to switch the MOSFET?
That will determine the values of the resistors and the type of transistor.
What could be the resistor value ???According to this data sheet you should apply a Vgs of at least -1.5V to turn it ON and a Vgs of <0.4V to turn it OFF.
If the MOSFET source is connected to a plus voltage of 3V to 4.2V then you need to add a NPN transistor buffer stage from the controller output to the MOSFET gate.
Connections are:
Controller to resistor to NPN base.
NPN emitter to common.
NPN collector to (second) resistor to +ve rail.
MOSFET gate to NPN collector.
The MOSFET will turn on when the controller output is 3V.
How fast do you need to switch the MOSFET?
That will determine the values of the resistors and the type of transistor.
I tried the attached schematic but it did not work.The resistor values are determined by how fast you do to switch.
If it's just for infrequent switching, then use anywhere from 10k-50kΩ for both resistors.