Pnp High Side Switch

This requires both a robust low on resistance power switch and accurate analog circuitry for diagnostic protection and control functions. A p channel mosfet and a resistor. The real switch is still the pnp transistor on the right.

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Basically When The Io Pin Outputs Low Transistor Q1 Npn Turns Off And Its Collector Is In High Impedance Status Hence Q2 P Interface Arduino Transistors

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The source is also at 5 volts.

Pnp high side switch.

Notice that the emitter is connected to the positive voltage. Now this is the same circuit but the gate is connected to ground instead of 5 volts. Using pnp transistors is essentially the same as npn transistors except the polarities are reversed. Figure 8 2 shows a circuit using a pnp transistor as a high side switch.

So the vgs in this case is 0 volts. 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. High side switches can safely drive high currents into complex resistive inductive and capacitive grounded loads in compliance with the harsh automotive environment.

Which means that pnp transistor shown in the first image will always be on regardless of the i o pin state. This transistor connects between v and the load. Look at the voltages in this high side switch configuration. The opposite of the low side switch is the high side switch.

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. Building a high side switch with 2 components. Typically these use a pnp bjt or p channel mosfet.

The arrow in the emitter of a pnp transistor points in the opposite direction than in an npn transistor. This voltage means the mosfet is turned off or an open. That means the vgs is 5v 5v 0v.

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