Fig. 1 VOM1271 optocoupler driving an IGBT transistor.
VOM1271 Photovoltaic MOSFET Driver Circuits
by Lewis Loflin
The VOM1271 generates 8-volts to turn on MOSFETs and IGBTs.
Update August 2021: IGBT based high-voltage h-bridge. See IGBT Based High Voltage H-Bridge DC Motor Control
In Fig. 1 is a test circuit I used to evaluate the VOM1271 photovoltaic opto-coupler. It worked well for N-channel and P-channel MOSFETs and IGBTs. To quote the manufacturer data:
The VOM1271 is a stand-alone optically isolated MOSFET driver. Unlike conventional MOSFET drivers, which require an external power supply to provide VCC and or VDD rails to the driver itself, the VOM1271 obtains all the required current to drive its internal circuitry from the LED current on the low voltage primary side of the isolation barrier.
This saves the designer the space and cost associated with providing one or more external power supplies. The VOM1271 also integrates a turn-off circuit internal to the component itself, thus doing away with the need for additional components in order to increase the overall switching speed by decreasing the turn-off time.
These features, combined with a small SOP4 package, provide designers with a small footprint, highly integrated isolated gate driver solution for a large variety of MOSFET drive applications.
In my case I turned the test circuit on-off with an Arduino Uno. But when I connected the Arduino ground or common to the same power supply common connected to the VOM1271 output circuit the unit failed to work. The output of these photovoltaic opto-couplers is often 10uA.
So the power supply for the output circuit must be separate from Arduino.
Fig. 2 VM1271 photovoltaic optocoupler internal diagram.
Fig. 2 is the VOM1271 internal block diagram.
Fig. 3 VOM1271 optocoupler driving single N-channel MOSFET.
Fig 3 illustrates the typical MOSFET connection to the VOM1271 or similar type photovoltaic opto-coupler.
It required no other external circuitry.
Fig. 4 VOM1271 with two power MOSFETs forms bidirectional AC-DC switch.
Fig. 4 VOM1271 with two 2N7000 MOSFETs forms bidirectional AC-DC switch rated at 200mA at 60V.
Fig. 5 All IGBT based H-bridge motor control.
Update August 2021: IGBT based high-voltage h-bridge. See IGBT Based High Voltage H-Bridge DC Motor Control
Alternative Parts
The Vishey VOM1271T is available from Mouser Electronics for $2.33 each or $1.94 each Qty 10.
An alternative is the Toshiba TLP3906 $2.08 each or $1.69 each Qty 10.
- Exploring Solid State Relays and Control Circuits
- Comparing Photo Triac, Photo SCR Opto-Couplers
- Light Activated SCR Based Optocouplers Circuit Examples
- Silicon Controlled Rectifier Review and Circuits
- Silicon Controlled Rectifiers Connected as Power Triacs
- Insulated Gate Bipolar Transistor IGBT Circuits
- Current Limiter Circuits for Opto-Coupler LEDs
- VOM1271 Photovoltaic MOSFET Driver Circuits
- Current Limiter Allows Safe Testing of Zener Diodes, LEDs
- 3 Amp LM741 Op-Amp Constant Current Source
- Bidirectional Solid State Relay Circuits
- Simple Solid State Relay for Low Power LED 120V Lamps
- Build High Power MOSFET Directional Switch Relay
- Optical Isolation of H-Bridge Motor Controls
- All NPN Transistor H-Bridge Motor Control
- Basic Transistor Driver Circuits for Micro-Controllers
- ULN2003A Darlington Transistor Array with Circuit Examples
- Tutorial Using TIP120 and TIP125 Power Darlington Transistors
- Driving 2N3055-MJ2955 Power Transistors with Darlington Transistors
- Understanding Bipolar Transistor Switches
- N-Channel Power MOSFET Switching Tutorial
- P-Channel Power MOSFET Switch Tutorial
- Build a Transistor H-Bridge Motor Control
- H-Bridge Motor Control with Power MOSFETS
- More Power MOSFET H-Bridge Circuit Examples
- Build a High Power Transistor H-Bridge Motor Control
- H-Bridge Motor Control with Power MOSFETS Updated
- Opto-Isolated Transistor Drivers for Micro-Controllers
- Comparator Theory Circuits Tutorial
- Constant Current Circuits with the LM334
- LM334 CCS Circuits with Thermistors, Photocells
- LM317 Constant Current Source Circuits
- TA8050P H-Bridge Motor Control
- All NPN Transistor H-Bridge Motor Control
- Basic Triacs and SCRs
- Comparator Hysteresis and Schmitt Triggers
- Comparator Theory Circuits Tutorial
- Photodiode Circuits Operation and Uses
- Optocoupler MOSFET DC Relays Using Photovoltaic drivers
- Connecting Crydom MOSFET Solid State Relays
- Photodiode Op-Amp Circuits Tutorial
- Optocoupler Input Circuits for PLC
- H11L1, 6N137A, FED8183, TLP2662 Digital Output Optocouplers
- Optical Isolation of H-Bridge Motor Controls
- All NPN Transistor H-Bridge Motor Control
© Copyright 2019 Lewis Loflin E-Mail