How do you choose a reverse protection diode?

How do you choose a reverse protection diode?

Choose a Schottky diode if you can. Schottky diodes have lower voltage drops and are usually better suited for low voltage, low current demand circuits – the kinds of circuits that makers gravitate towards. Choose a diode that it is rated for the voltage and current requirements of your circuit.

What are the devices for over voltage protection?

Overvoltage protection devices

• Arcing horns.
• Avalanche diode.
• Gas-filled tube.
• Lightning rod.
• Metal-oxide varistor.
• SiBar Thyristor.
• Spark gap.
• Transient-voltage-suppression diode.

Which is the best reverse current protection switch?

This high-side PMOS FET switch offers simple reverse-current protection in exchange for higher on-resistance and cost. For battery voltages lower than 10V but higher than 2.7V, you can use a low-voltage PMOS FET, such as the Siliconix Si9433DY or Si9435DY.

How does a reverse current circuit protect a battery?

A variety of circuits can provide this assurance. The simplest form of battery-reversal protection is a diode in series with the positive supply line ( Figure 1a ). The diode allows current from a correctly installed battery to flow to the load and blocks current flow to a backward-installed battery.

Why does a pMOS FET need reverse current protection?

Because the charge pump runs on the battery voltage and thus also needs protection from battery reversal, the circuit connects a diode between the battery’s positive terminal and the IC’s V CC terminal. PMOS FETs operate on the high side and require no extra circuitry for gate drive.

How does a reverse current DC / DC converter work?

For V IN = 2V, the gate drive is approximately – (V IN +V OUT) = -7V. A battery reversal makes the CMOS DC/DC converter resemble a forward-biased diode; the converter turns off the switch by hauling the gate voltage at least one diode drop above the source.