PSD8826
Dual H-bridge motor driver with 2A per channel, PWM control, current sensing for DC motor applications
Product Overview
Description
The PSD8826 is a dual H-bridge motor driver capable of driving two DC motors or one stepper motor with up to 2A per channel.
With low RDS(on) of 0.3Ω per switch and integrated current sensing, this driver provides efficient motor control for robotics and automation applications.
The device features PWM speed control, overcurrent protection, thermal shutdown, and multiple interface options including parallel and serial control.
Product Series
PSD
Primary Application
Robotics and automation
Key Features
- Dual H-bridge for two DC motors or one stepper
- 2A continuous current per channel
- Low RDS(on) of 0.3Ω for high efficiency
- Integrated current sensing
- PWM speed control up to 100 kHz
- Multiple control interface options
- Comprehensive protection features
- Low standby current: 10 uA
- Industrial and automotive grade available
Specifications
| Motor Supply Voltage | 4.5V - 28V |
|---|---|
| Output Current | 2A continuous per channel, 3A peak |
| RDS(on) | 0.3Ω per switch typical |
| PWM Frequency | Up to 100 kHz |
| Current Sensing | Integrated 0.2Ω sense resistor |
| Logic Supply | 2.7V - 5.5V |
| Protection | Overcurrent, overtemperature, short-circuit |
| Temperature Range | -40°C to +85°C (Industrial), -40°C to +125°C (Automotive) |
| Package | TSSOP-24, QFN-32 |
Applications
Robotics and automation
Industrial automation and control
CCTV camera positioning
Electronic system design
Printers and scanners
Electronic system design
Toys and consumer electronics
Consumer electronics
Industrial valve control
Industrial automation and control
Medical equipment
Medical electronics
Battery-powered devices
Battery and charging management
FAE Expert Insights
"The PSD8826 is my go-to recommendation for DC motor control applications. The low RDS(on) of 0.3Ω keeps power dissipation low even at 2A continuous current. I particularly like the integrated current sensing - it eliminates the need for external sense resistors and simplifies current control loops. I've used this driver in robotics applications where the 100 kHz PWM frequency allows smooth speed control without audible noise. The protection features are comprehensive and have saved several designs from damage during testing. For best performance, I recommend using short, wide traces for motor connections and placing bulk capacitance close to the driver."
Low RDS(on) with integrated current sensing for efficient motor control
— Robert Zhang, BeiLuo
Frequently Asked Questions
What is the maximum current the PSD8826 can deliver?
The PSD8826 can deliver up to 2A continuous current per channel with adequate thermal management. The device can handle 3A peak current for short durations (typically less than 1 second). The actual maximum current depends on thermal conditions - with good heatsinking and airflow, the driver can sustain 2A continuously. Without heatsinking, the current may need to be derated to prevent thermal shutdown. The integrated current limiting protects the driver and motor from overcurrent conditions.
The 2A rating is suitable for most small to medium DC motors. For higher currents, consider parallel operation or contact our FAE team for alternatives.
How do I control motor speed with the PSD8826?
Motor speed is controlled using PWM (Pulse Width Modulation) signals applied to the enable pins. The duty cycle of the PWM signal determines the average voltage applied to the motor, which controls speed. The PSD8826 supports PWM frequencies up to 100 kHz. For smooth speed control, use frequencies above 20 kHz to avoid audible noise. The device includes internal shoot-through protection to prevent simultaneous conduction of high-side and low-side switches. Connect the PWM signal to the EN pin while using the IN pins to control direction.
Use 20-50 kHz PWM for quiet operation. Our FAE team can provide reference code for microcontroller-based motor control.
How does the integrated current sensing work?
The PSD8826 includes integrated current sensing using a 0.2Ω sense resistor in the low-side return path. The voltage across this resistor is proportional to motor current and can be monitored at the ISENSE pin. This eliminates the need for external sense resistors and associated power loss. The current signal can be used for closed-loop current control, overcurrent protection, or stall detection. For best accuracy, use a differential measurement or ensure the sense pin reference is properly grounded.
Use integrated sensing for current limiting and protection. For precise current control, calibrate against a known current source.
Can the PSD8826 drive a stepper motor?
Yes, the PSD8826 can drive a bipolar stepper motor by using both H-bridges together. Connect one bridge to each phase of the stepper motor. Control the phase currents using the PWM inputs to implement microstepping. While the PSD8826 doesn't include built-in stepper control logic, it provides the power stage for external controllers. For full-step or half-step operation, use the IN pins to sequence the phases. For microstepping, use PWM to control current levels in each phase.
Use dedicated stepper drivers for complex microstepping. The PSD8826 is best for simple full/half-step applications or DC motor control.
What protection features does the PSD8826 include?
The PSD8826 includes comprehensive protection features: Overcurrent Protection (OCP) limits current to safe levels during overload; Thermal Shutdown disables the driver at 165°C junction temperature with hysteresis; Short-Circuit Protection prevents damage from motor terminal shorts; Undervoltage Lockout (UVLO) disables operation when supply voltage is too low; and Shoot-Through Protection prevents simultaneous conduction of high-side and low-side switches. These features protect both the driver and connected motor under fault conditions.
The built-in protections are sufficient for most applications. For additional protection, add external TVS diodes for transient suppression.