Overview
The L9908TR, produced by STMicroelectronics, is a gate driver unit (GDU) designed for controlling 6 N-channel FETs in brushless motor applications within the automotive sector. This device is specifically tailored for use in passenger, commercial, and hybrid vehicles. It features three independent half-bridge driver channels, each capable of being configured independently to support various load driving scenarios. The L9908TR can withstand voltage excursions from -14 V to 95 V on the motor connection pins, making it robust for demanding automotive environments.
Key Specifications
| Parameter | Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDH Motor Supply Voltage | Range for motor supply voltage | 4.5 | - | 75 | V |
| VDD Internal Supply Voltage | Generated from 5 V on VDD pin | 4.85 | 5 | 5.15 | V |
| Digital I/O Compatibility | Logic levels | 3.3 V / 5 V | - | - | - |
| Current Monitor Range | Differential voltage range for current measurements | -14 | - | 6 | V |
| Phase Voltage Monitor Range | Real-time phase voltage monitoring range | -14 | - | 95 | V |
| SPI Interface Frequency | Communication frequency | - | - | 10 MHz | - |
| Operating Temperature | Range of operating temperatures | -40 | - | 150 | °C |
| Package Type | Package description | - | - | TQFP 48 7x7x1.0 | - |
Key Features
- AEC-Q100 Qualified and ISO26262 Compliant: Ensures high reliability and safety standards for automotive applications, including ASIL-D systems readiness.
- Wide Motor Supply Voltage Range: Supports single (12 V), double (24 V), and 48 V battery systems.
- Independent Half-Bridge Drivers: Each of the three half-bridge driver channels can be independently configured.
- High Accuracy Current Monitors: Three differential current monitors with SPI-configurable gain factor and output offset, and built-in error calibration.
- Real-Time Phase Voltage Monitoring: SPI-programmable phase voltage feedback and phase duty cycle measurement.
- Comprehensive Protection and Diagnostics: Includes shoot-through diagnosis, dead-time protection, short to battery and ground detection, over-temperature protection, and more.
- 32-bit SPI Interface: Up to 10 MHz communication with 5-bit CRC, 1-bit frame counter, and SPI-configurable Window Watchdog.
- Digital I/O Compatibility: Compatible with 3.3 V and 5 V logic levels.
Applications
- Electronic Power Steering (EPS): Used in steering systems that require precise motor control.
- HVAC Blowers: For heating, ventilation, and air conditioning systems in vehicles.
- Engine Cooling Fans: To control the cooling fans in automotive engines.
- Electronic Brake Booster: In advanced braking systems that require electronic control.
- EWP, EFP, EOP (Electric Water Pump, Electric Fuel Pump, Electric Oil Pump): For various electrically driven pumps in vehicles.
Q & A
- What is the primary function of the L9908TR?
The L9908TR is a gate driver unit (GDU) designed to control 6 N-channel FETs for brushless motors in automotive applications.
- What are the key safety certifications of the L9908TR?
The L9908TR is AEC-Q100 qualified and fully ISO26262 compliant, making it suitable for ASIL-D systems.
- What is the range of the motor supply voltage for the L9908TR?
The motor supply voltage range is from 4.5 V to 75 V, supporting single, double, and 48 V battery systems.
- How many independent half-bridge driver channels does the L9908TR have?
The L9908TR has three independent half-bridge driver channels.
- What kind of current monitoring does the L9908TR offer?
The L9908TR features three differential high accuracy current monitors with SPI-configurable gain factor and output offset.
- What is the frequency of the SPI interface on the L9908TR?
The SPI interface operates up to 10 MHz.
- What types of protection and diagnostics does the L9908TR include?
The L9908TR includes shoot-through diagnosis, dead-time protection, short to battery and ground detection, over-temperature protection, and more.
- What is the operating temperature range of the L9908TR?
The operating temperature range is from -40°C to 150°C.
- What package type is the L9908TR available in?
The L9908TR is available in a TQFP 48 7x7x1.0 package.
- What are some common applications of the L9908TR?
Common applications include Electronic Power Steering (EPS), HVAC Blowers, Engine Cooling Fans, Electronic Brake Booster, and various electrically driven pumps.
