Demand Peripherals     Robotics and Automation Made Easy

DRV4: Quad Open-Drain Driver

The Quad Open-Drain Driver card (DRV4) has four independently controlled high current NFET transistors. Each transistor has a back EMF protection diode. Each channel can handle up to 15 Amps of of current but the total board current is limited to 15 Amps as well.


- Total combined current maximum of 15 Amps
- Per output current maximum of 15 Amps
- Back EMF protection diodes
- Work with or without the FPGA card


The DRV4 card is often paired with the "out4" peripheral and driver, or the unipolar stepper motor periperal ("ustep"). It is also sometime paired with the PWM output peripheral and driver in order to control the intensity of four strings of high current LEDs.



The schematic and layout of the DRV4 are shown below. The Eagle schematic and board files are available here: drv4.sch and drv4.brd. The bill-of-materials is available here: drv4.txt.




FPGA Defined Peripherals
User Interface
FPGA Configuration
FPGA Buttons & LEDs
Text LCD and Keypad
Quad WS2812 Interface
Quad Slide Pot
Tone Generator
IR Recv/Xmit
6 Digit LCD
RC Decoder
Keyfob RF Decoder
Rotary Encoder Interface
Quad Touch Interface
Motion Control
Dual DC Motor Controller
Dual Quadrature Decoder
Quad 13 Bit Servo
Bipolar Stepper Controller
Unipolar Stepper Controller
Simple Input / Output
Quad Binary Output
Quad Binary Input
Octal Input/Output
32 Channel Binary Output
32 Channel Binary Input
Octal 12-bit ADC
Quad Ping))) Interface
Octal SRF04 Interface
Quad Event Counter
Generic I2C
Generic SPI
Octal 8-Bit DAC
Quad Digital Potentiometer
Quad PWM Output
Quad PWM Input
4 Bit Pattern Generator
Real Time Clock
Dual Watchdog Timers

Interface Cards
User Interface
Audio Amplifier
IR Recv/xmit
Six Digit LCD Display
Keyfob RF Receiver
Rotary Encoder
Quad Switch Card
Text LCD / keypad
Quad Slide Pot
Quad Touch Interface
Motion Control
Dual 7-amp H-bridge
Quad Open Drain Driver
Quad 10 Amp Relay Card
Input / Output
Octal 8-Bit DAC
Quad Digital Potentiometer
Octal 12-bit ADC
Octal SRF04
Generic I2C
Generic SPI
USB 2.0 Hub
Real Time Clock
Slot Expander
Octal Input/Output
32 Channel Input
32 Channel Output
Power Distribution Card
15 Amp Power Distribution
5 Volt Switching Regulator
ATX Power Break-Out Card
Disk Drive Power Break-Out
MP43 Aluminum Mounting Plate
WW2 Prototyping Card
WW1 Small Prototyping Card