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Texas Instruments DRV2911-Q1 Full-Bridge PWM Input Piezo Driver

Texas Instruments DRV2911-Q1 Full-Bridge PWM Input Piezo Driver integrates two H-bridges for driving piezo-based Lens Cover Systems, LCS, up to 40V absolute maximum capability. This capability is done while maintaining a very low RDS(ON) to reduce switching losses. DRV2911-Q1 integrates a power management LDO (3.3V/30mA) and buck converter (5.0V to 5.7V, ≤ 200mA) that can be used to power external circuits like the Ultrasonic Lens Cleaning (ULC) controller, ULC1001. Each output driver channel consists of N-channel power MOSFETs configured in a half-bridge configuration. Two independent PWM inputs drive each half-bridge. The Texas Instruments DRV2911-Q1 includes a 30mA, 3.3V LDO regulator.

Several protection features, including supply undervoltage lockout (UVLO), charge pump undervoltage (CPUV), overcurrent protection (OCP), over-temperature warning (OTW), and over-temperature shutdown (OTSD), are integrated into DRV2911-Q1 to protect the device and system against fault events. Fault conditions are indicated by the FAULTZ pin. The fault pin can also be tied to the controller device, like ULC1001-Q1, where a fault can be recognized over I2C.

Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1 (-40°C ≤ TA ≤ 125°C)
    • Wettable flank package
  • 2-channel half-bridge driver
    • PWM inputs for each half-bridge control
    • Overcurrent protection
    • Supports up to 200kHz PWM frequency
  • 5V to 35V operating voltage (40V abs max)
  • 8A peak high output current capability
  • Low MOSFET on-state resistance
    • 95mΩ (typ.) RDS(ON) (HS + LS) at TA = 25°C
  • Low-power sleep mode
    • 2.5µA (max.) at VPVDD = 13.5V, TA = 25°C
  • Supports 1.8V, 3.3V, and 5V logic inputs
  • Built-in 3.3V, 30mA LDO regulator
  • Integrated protection features
    • Supply undervoltage lockout (UVLO)
    • Charge pump undervoltage (CPUV)
    • Overcurrent protection (OCP)
    • Thermal warning and shutdown (OTW/OTSD)
    • Fault condition indication pin (FAULTZ)

Applications

  • Automotive thermal camera
  • Camera module without processing
  • Mirror replacement/camera mirror system
  • Rear camera
  • Surround-view system ECU

Simplified Application

Application Circuit Diagram - Texas Instruments DRV2911-Q1 Full-Bridge PWM Input Piezo Driver

Additional Resources

Development Tool

Texas Instruments ULC1001-DRV2911EVM Evaluation Module

An electrical system that activates the lens cover and discharges contaminants.

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Publicado: 2024-08-12 | Actualizado: 2025-05-15