Pnp High Side Switch

This voltage means the mosfet is turned off or an open.

Pnp high side switch.

A p channel mosfet and a resistor. Look at the voltages in this high side switch configuration. 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. We ll need a more complex circuit to implement a practical high side power on switch.

Notice that the emitter is connected to the positive voltage. Which means that pnp transistor shown in the first image will always be on regardless of the i o pin state. The real switch is still the pnp transistor on the right. The gate is now at 5 volts.

Because of how transistors work these can be a little more difficult to use in an arduino or raspberry pi circuit. The arrow in the emitter of a pnp transistor points in the opposite direction than in an npn transistor. Now this is the same circuit but the gate is connected to ground instead of 5 volts. Building a high side switch with 2 components.

This requires both a robust low on resistance power switch and accurate analog circuitry for diagnostic protection and control functions. Typically these use a pnp bjt or p channel mosfet. Figure 8 2 shows a circuit using a pnp transistor as a high side switch. The source is also at 5 volts.

High side switches can safely drive high currents into complex resistive inductive and capacitive grounded loads in compliance with the harsh automotive environment. Using pnp transistors is essentially the same as npn transistors except the polarities are reversed. This transistor connects between v and the load.