STMicroelectronics L9908 Three-Phase Motor Gate Driver
STMicroelectronics L9908 Three-Phase Motor Gate Driver
STMicroelectronics L9908 Three-Phase Motor Gate Driver Unit (GDU) is designed to control brushless motors in automotive applications. The three half-bridge driver channels (HS/LS coupling) can be independently configured to drive different loads, and the STMicroelectronics L9908 can tolerate -14V--+95V offset on the motor pins. The pre-driver stage is controlled via 6 dedicated parallel inputs supporting 0%--100% duty cycle operation. This feature also supports the implementation of various motor control strategies.
STMicroelectronics L9908 integrates a voltage regulator, charge pump and bootstrap circuit and is suitable for use in passenger cars, commercial vehicles or hybrid vehicles. Ensure safe half-bridge operation with breakdown diagnostics, dead time, short-to-battery, short-to-ground and open-circuit load detection, and real-time phase voltage monitoring.
STMicroelectronics L9908 Automotive Three-Phase Motor GDU features three independent high-accuracy current monitor channels with SPI configurable input differential voltage ranges for ground-referenced current measurements. This includes 5V/3.3V output dynamic range compatibility. STMicroelectronics L9908 features external and internal power supplies, ground levels, and internal temperature diagnostics.
Features a 32-bit superframe SPI slave interface for up to 10MHz communication between STMicroelectronics L9908 and the uC. SPI communications are protected with 5-bit CRC, 1-bit frame counter, frame length check, and SPI configurable window watchdog.
STMicroelectronics L9908 Features
AEC-Q100 Compliant
Fully compliant with ISO26262 standard, support ASIL-D system
VDH supervisor supply voltage range from 4.5V to 75.0V for single cell (12V system), dual cell (24V system) and 48V battery applications
Generates 3.3V internal supply voltage from 5V on VDD pin
Digital I/O compatible with 3.3V/5.0V logic circuits
6 independent N-channel FET pre-drivers:
Dedicated source connections to each FET
The device can withstand -14V to +95V on the motor connection pins
Supports 0% to 100% duty cycle operation
Dedicated PWM input pins for each gate driver
3 differential precision current monitors for ground referenced current measurements:
ADC/DAC Architecture
SPI adjustable gain factor and output offset
Built-in error calibration
The device is tolerant to -14V to +6V on the input sense pin
SPI readable current measurement
DAC output dynamic range: 0V to 4.6V
32-bit 10MHz SPI interface with 5-bit CRC and 1-bit frame counter for internal setup, self-test and full diagnostics
3 real-time phase voltage monitor channels:
SPI Programmable Phase Voltage Feedback
SPI readable phase duty cycle measurement
Protection and Diagnostics:
SPI programmable VDS diagnostics and protection (on state)
SPI programmable dead time protection
SPI Programmable Breakdown Diagnostics and Protection
Open load, short to GND and short to battery diagnostics in off state
Overheating Diagnostics and Protection with SPI Programmable Warning Flags
SPI readable Tj measurement
Ground Loss Diagnosis
System clock monitoring
Power supply pins VDD, VDH, VBP overvoltage and undervoltage diagnostics
FET driver power supply VPRE and VCP undervoltage and overvoltage diagnostics
SPI window watchdog
Fault status flag output
