Infineon TLE9855QX: An Integrated H-Bridge MOSFET Driver for Automotive Motor Control Applications
The evolution of automotive systems towards greater electrification demands highly integrated, robust, and efficient semiconductor solutions. At the heart of many comfort, safety, and powertrain applications—from power windows and sunroofs to fuel pumps and engine cooling fans—lies the need for precise DC motor control. The Infineon TLE9855QX stands out as a monolithic integrated circuit designed specifically to meet these stringent automotive requirements, offering a complete and compact solution for driving brushed DC motors.
This device exemplifies a high level of integration by combining an N-channel H-Bridge MOSFET driver, a charge pump, and an Arm® Cortex®-M0 microcontroller core on a single chip. This architecture eliminates the need for multiple discrete components, significantly reducing the system's PCB footprint, overall bill of materials (BOM) cost, and design complexity. The integrated H-Bridge, capable of driving loads up to 30A, is built using Infineon's proven embedded MOSFET technology, ensuring low power dissipation and high efficiency.
A key strength of the TLE9855QX is its focus on robust performance and system safety. It is engineered to operate within the harsh environment of an automobile, supporting a wide supply voltage range from 4.5V to 28V, with handling capabilities for load-dump and jump-start conditions up to 40V. The chip incorporates a comprehensive suite of advanced protection features, including over-current protection (OCP), over-temperature shutdown (OTSD), under-voltage lockout (UVLO), and short-circuit protection. These features are critical for preventing damage to the motor and the control unit itself, ensuring long-term reliability.
The embedded 32-bit Arm® Cortex®-M0 core provides the intelligence for flexible motor control. It allows designers to implement sophisticated control algorithms, such as Pulse-Width Modulation (PWM) for speed control and diagnostics for real-time system monitoring. This programmability enables the same hardware platform to be adapted for a wide range of motor types and performance characteristics, simplifying inventory and design reuse across different vehicle platforms. Communication with a host ECU is seamlessly handled via LIN 2.2/SAE J2602 and CAN FD interfaces, making it a perfect node in modern automotive networks.
ICGOOODFIND: The Infineon TLE9855QX is a superior, all-in-one solution that masterfully integrates power, control, and communication. Its high level of integration, coupled with robust protection features and a programmable core, makes it an ideal choice for developers aiming to create compact, reliable, and efficient brushed DC motor control systems for the demanding automotive market.
Keywords: Integrated H-Bridge, Automotive Motor Control, Cortex-M0 Microcontroller, Robust Protection Features, LIN/CAN FD Communication.
