Pnp High Side Switch

Which means that pnp transistor shown in the first image will always be on regardless of the i o pin state.

Pnp high side switch. The arrow in the emitter of a pnp transistor points in the opposite direction than in an npn transistor. A p channel mosfet and a resistor. Because of how transistors work these can be a little more difficult to use in an arduino or raspberry pi circuit. Now this is the same circuit but the gate is connected to ground instead of 5 volts.

Look at the voltages in this high side switch configuration. We ll need a more complex circuit to implement a practical high side power on switch. High side switches can safely drive high currents into complex resistive inductive and capacitive grounded loads in compliance with the harsh automotive environment. The opposite of the low side switch is the high side switch.

This requires both a robust low on resistance power switch and accurate analog circuitry for diagnostic protection and control functions. This voltage means the mosfet is turned off or an open. Notice that the emitter is connected to the positive voltage. Just use an integrated high side switch something like auri3313 and a sot323 transistor and you have a high side switch with 10mohm 20a thermal protection short circuit protection for few.

This transistor connects between v and the load. That means the vgs is 5v 5v 0v. Using pnp transistors is essentially the same as npn transistors except the polarities are reversed. So the vgs in this case is 0 volts.

Building a high side switch with 2 components. The real switch is still the pnp transistor on the right. Typically these use a pnp bjt or p channel mosfet.