Mosfet High Voltage

01-05-2021

Mosfet High Voltage

Mosfet High Voltage Shunt Regulator
Mosfet High Voltage Input
Mosfet High Voltage Switch

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Using a MOSFET as a switch is generally pretty simple. Make the gate voltage sufficient with respect to the source and current flows through the channel. However, if you are switching higher voltages, you may need some additional circuitry to protect the device’s gate and possibly the microcontroller driving the whole thing, too. [Lewis] discusses high voltage switching in the latest in his series of videos dealing with MOSFETs. You can see the video below.

You’ll see in the video a breadboard setup driving a 50 V load and also a higher-voltage H-bridge. Magic cleaner for iphone. There are three major topics covered: Using an optoisolator, using a gate bleeder resistor, and using a zener diode to limit gate voltage.

Of course, an optoisolator isn’t necessary with or without the high voltage, as long as everything works well. It can, however, prevent high-frequency noise from conducting from the FET channel through the gate acting as a capacitor. It can also be useful for saving the controller if there is a failure that shorts the channel to the gate.

The bleeder resistor isn’t specific to high voltages, either. Because the gate is practically an open circuit at DC, it is a good idea to add a resistor like this so that when the gate drive is off, you don’t have to wait for the charge on the gate to dissipate. In addition, the resistor offers some protection against electrostatic discharge (ESD) damage, since the ESD will tend to flow through the resistor instead of punching through the gate oxide on the device.

The zener sees service in two ways. At first, the circuit uses it to derive 12 V from the 50 V supply. However, in a later incarnation, the design uses it as a clamp to keep a P-channel’s gate at 12 V. These are both important because the maximum rating of the gates is 20 V.

Although the devices in the video are IRF630s and IRF9630s, the principles apply to lots of different kind of FETs. Just remember what you kind you have and understand the datasheet before you finalize your design.

If you want something more basic, there are plenty of tutorials. We’ve even looked at high-side switches in detail.

Opto MOSFET relay for High Voltage Applications

Bright TOWARD achieves a higher level of power handling capability using LED triggered D-MOSFET technology. Compared to traditional mechanical relays, Opto MOSFET relays provide great benefits, including reducing real-estate of PCB – small form factor, longer life as semiconductor, and high-speed switching -quick response and performance. Opto MOSFET relay for high voltage applications in Industrial, Robotics, Security, and a broad range of applications. The Control line is optically isolated from the high voltage signal line. Therefore, these products give design flexibility in high power applications and ensure great dielectric strength between input and output signals.

The much higher voltage required? Bright TOWARD Industrial Co., Ltd., released Silicon Carbide (SiC) products for high current and high voltage applications. Please visit out SiC page for more detail.

38 Series / 38-2 Series Opto MOSFET relay

Features

60 to 80mA / 600V Load (38 Series)
1500Vrms I/O Breakdown Voltage (38 Series)
120mA / 650V Load (38-2 Series)
3750Vrms I/O Breakdown Voltage (38-2 Series)
for industrial control, robotics, security, transportation equipment, instrumentation, meters, and aerospace/defense applications

Product Name	Contact Form	Load Voltage (Max)	Operation LED Current (Max)	Load Current (Max)	On-Resistance (Typ)	Output Capacitance (Typ)	Off-State Leakage Current (Max)	I/O Breakdown Voltage	Device Package	Packaging
AA38	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	3750Vrms	DIP6	Stick
AA38-H	1FromA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	5000Vrms	DIP6	Stick
AA38F	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	3750Vrms	SMD6	Stick/Tape
AA38F-H	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	5000Vrms	SMD6	Stick/Tape
AB38	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	3750Vrms	DIP4	Stick
AB38-H	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uF	5000Vrms	DIP4	Stick
AB38F	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uF	3750Vrms	SMD4	Stick/Tape
AB38F-H	1FormA	600V	3.0mA	80mA	40 Ohm	47pF	1.0uA	5000Vrms	SMD4	Stick/Tape
AB38S	1FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	1500Vrms	SOP4	Stick/Tape
AB38S-H	1FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	3750Vrms	SOP4	Stick/Tape
AC38	2FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	3750Vrms	DIP8	Stick
AC38-H	2FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	5000Vrms	DIP8	Stick
AC38F	2FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	3750Vrms	SMD8	Stick/Tape
AC38F-H	2FormA	600V	3.0mA	70mA	40 Ohm	47pF	1.0uA	5000Vrms	SMD8	Stick/Tape
AC38S	2FormA	600V	3.0mA	60mA	40 Ohm	47pF	1.0uA	1500Vrms	SOP8	Stick/Tape
AC38S-H	2FormA	600V	3.0mA	60mA	40 Ohm	47pF	1.0uA	3750Vrms	SOP8	Stick/Tape
AA38-2	1FormA	650V	5.0mA	120mA	20 Ohm	110pF	1.0uA	3750Vrms	DIP6	Stick
AA38-2H	1FormA	650V	5.0mA	120mA	20 Ohm	110pF	1.0uA	5000Vrms	DIP6	Stick
AA38F-2	1FormA	650V	5.0mA	120mA	20 Ohm	110pF	1.0uA	3750Vrms	SMD6	Stick/Tape
AA38F-2H	1FormA	650V	5.0mA	120mA	20 Ohm	110pF	1.0uA	5000Vrms	SMD6	Stick/Tape

38-2 Series Data Sheet

Please contact us for 38-2 Series Data Sheet

39 Series Opto MOSFET relay

Features

50mA /1000V Load
3750Vrms I/O Breakdown Voltage
for industrial control, robotics, security, transportation equipment, instrumentation, meters, and aerospace/defense applications

Product Name	Contact Form	Load Voltage (Max)	Operation LED Current (Max)	Load Current (Max)	On-Resistance (Typ)	Output Capacitance (Typ)	Off-State Leakage Current (Max)	I/O Breakdown Voltage	Device Package	Packaging
AA39	1FormA	1000V	5.0mA	60mA	100 Ohm	144pF	10uA	3750Vrms	DIP6	Stick
AA39-H	1FormA	1000V	5.0mA	60mA	100 Ohm	144pF	10uA	5000Vrms	DIP6	Stick
AA39F	1FormA	1000V	5.0mA	60mA	100 Ohm	144pF	10uA	3750Vrms	SMD6	Stick/Tape
AA39F-H	1FormA	1000V	5.0mA	60mA	100 Ohm	144pF	10uA	5000Vrms	SMD6	Stick/Tape

39 Series Data Sheet

Please contact us for 39 Series Data Sheet

40 Series Opto MOSFET relay