Combo Motor Driver With DC-DC Converter 48-HTSSOP -40 to 85# DRV8808DCAR Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The DRV8808DCAR is a versatile H-bridge motor driver IC designed for precise control of brushed DC motors and solenoids in various applications:
Primary Motor Control Applications:
- Precision positioning systems requiring accurate speed and direction control
- Automated valve actuators in industrial process control
- Office automation equipment including printers, scanners, and copiers
- Robotics joint control for small to medium-sized robotic systems
- Medical device actuators in diagnostic equipment and infusion pumps
Solenoid Drive Applications:
- Industrial solenoid valves for fluid control systems
- Electronic locking mechanisms in security systems
- Automated dispensing systems in manufacturing equipment
### Industry Applications
Industrial Automation:
- Factory automation systems - Conveyor belt controls, robotic arm positioning
- Process control equipment - Valve actuators, pump controls
- Packaging machinery - Precise material handling and positioning
Consumer Electronics:
- Home automation systems - Motorized blinds, smart locks
- Office equipment - Paper feed mechanisms, printer carriage movement
- Gaming peripherals - Force feedback mechanisms, movable components
Automotive Systems:
- Electronic throttle control (secondary systems)
- Power seat adjustments
- HVAC damper controls
- Window lift mechanisms
### Practical Advantages and Limitations
Advantages:
- Integrated protection features including overcurrent, overtemperature, and undervoltage lockout
- Low RDS(on) MOSFETs (typically 800 mΩ) for high efficiency operation
- Wide voltage range (8V to 60V) accommodating various power supply configurations
- PWM compatibility for smooth speed control and reduced power dissipation
- Compact package (HTSSOP-16) saving board space in space-constrained applications
Limitations:
- Current handling capacity limited to 2.8A peak, unsuitable for high-power industrial motors
- Thermal constraints requiring proper heat sinking in continuous high-current applications
- Single-channel design limits simultaneous control of multiple motors without additional ICs
- External component requirements for current sensing and protection circuits
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Thermal Management Issues:
- Pitfall : Inadequate heat dissipation leading to thermal shutdown during continuous operation
- Solution : Implement proper PCB copper pours, consider external heat sinking, and monitor junction temperature
Power Supply Design:
- Pitfall : Insufficient bulk capacitance causing voltage droop during motor startup
- Solution : Include adequate bulk capacitance (typically 100-470μF) near the IC power pins
EMI/RFI Concerns:
- Pitfall : Radiated emissions from motor wiring affecting sensitive circuits
- Solution : Use twisted pair wiring, implement ferrite beads, and include proper filtering
### Compatibility Issues with Other Components
Microcontroller Interface:
- Logic level compatibility : 3.3V and 5V logic compatible inputs
- PWM frequency limitations : Optimal operation between 20kHz and 100kHz
- Current sense amplifier requires external shunt resistor (typically 50-100mΩ)
Power Supply Requirements:
- Decoupling capacitors : 0.1μF ceramic and 10μF tantalum recommended near VBB pin
- External diodes : Required for inductive load protection during switching transitions
Motor Compatibility:
- Brushed DC motors up to 2.8A continuous current
- Solenoids with appropriate current ratings
- Not suitable for brushless DC or ste
