High and Low Side Drivers/Switches - STMicroelectronics
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High and low side driver

Can anybody help me in understanding exactly what a high side and low driver is? In a low-side switch, shown on the left, the load is between the power rail and the N-channel MOSFET doing the switching. In a high-side switch, shown on the right, the load is between ground and the P-channel MOSFET doing the switching.

The low-side switches are convenient for driving LEDs, relays, motors etc. If you are using it to drive an inductive load such as a relay or motor, make sure to put a suppression diode across the load.

High and low side driver

However they are not so good at supplying power to other circuits, because the ground reference for the driven circuit will be above the real ground by whatever the voltage drop through the MOSFET is. The high-side switches are better for turning power rails on and off. Because of the pull-up resistor, they are usually driven by an output pin configured as an open-drain OD. The logic is backwards however; to turn the MOSFET on, you put a ground on the gate.

To turn it off, you leave the pin floating as the pullup resistor will keep the MOSFET off. In the microcontroller, with an OD output, this is done by sending a 1 to the output pin. This would occur, for example if you are running a microcontroller at 5V and are switching 12V with the high-side switch. In this case, you can use a small N-channel MOSFET, whose output feeds the gate of the P-channel.

High Side Low Side Mosfet Driver

So one can use a MOSFET gate driver such as the Micrel MIC This allows a N-channel MOSFET to be used as a high-side switch. Even if the N-channel was being used in a low-side configuration, the driver chip would be needed to properly drive the gate fast enough.

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High and low side driver

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High side driver and Low side driver. What research have you done so far yourself? I ws instructed i hav 2 use these drivers for switching.. As f nw i dnt hav any basics in dis You use either a high-side switch or a low-side switch depending on the criteria I gave. So when you use a high side driver to switch and connect the switch to a load,the negative of the load is connected to the ground?

Yes, just like the right side of my diagram.

But I have seen circuits in which the negative of the load is connected to another switch in the drain.. Sign up or log in StackExchange. Sign up using Email and Password. Electrical Engineering Stack Exchange works best with JavaScript enabled. MathOverflow Mathematics Cross Validated stats Theoretical Computer Science Physics Chemistry Biology Computer Science Philosophy more Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent.

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