Infineon BSP752 High-Current PROFET™ Power Switch: Features and Application Design Guide
The Infineon BSP752 is a state-of-the-art High-Current PROFET™ (Protected FET) power switch designed for robust automotive and industrial applications. As part of Infineon’s PROFET family, this device integrates advanced protection, diagnostics, and control features into a single package, making it an ideal solution for driving heavy resistive, capacitive, and inductive loads—such as motors, heaters, and lamps—with currents up to 30 A.
Key Features
The BSP752 stands out with its high-level integration and diagnostic capabilities. Key features include:
- High-Side Switching: The device operates as a high-side switch, simplifying wiring and improving system safety by grounding the load.
- Over-Current and Short-Circuit Protection: The integrated current limitation and shutdown features protect the switch and the load from damage during fault conditions.
- Over-Temperature Protection: An internal thermal shutdown mechanism disables the switch when the junction temperature exceeds a safe threshold, automatically resuming operation once it cools down.
- Load Current Feedback: An analog diagnostic pin provides a proportional current mirror output, enabling real-time load current monitoring without external shunts.
- Over-Voltage Protection: The device is designed to handle load dump and other voltage transients common in automotive environments.
- Low Standby Current: With a quiescent current of only a few microamps, the BSP752 is suitable for always-on systems where low power consumption is critical.
Application Design Guide
Designing with the BSP752 requires attention to several key aspects to ensure reliability and performance:
1. PCB Layout: For high-current applications, use a PCB with sufficient copper thickness and width for power traces to minimize parasitic resistance and thermal stress. Place decoupling capacitors close to the VBAT and GND pins.
2. Thermal Management: The BSP752 is available in a TO-263-7 package with low thermal resistance. Still, for high-current or high-ambient-temperature conditions, a heatsink may be necessary to maintain junction temperature within limits.
3. Input Control: The switch is controlled via a CMOS-compatible input pin. A pull-down resistor is recommended to ensure defined off-state behavior in case of microcontroller pin high-impedance states.
4. Diagnostics Utilization: The IS pin (current sense) provides a current mirror output proportional to the load current. This can be fed into an ADC of a microcontroller for real-time diagnostics and fault reporting.
5. Inductive Load Handling: When driving inductive loads like motors or solenoids, external free-wheeling diodes or snubber circuits may be required to clamp negative voltage transients and protect the device.
6. Fault Handling: In case of a fault condition (e.g., short-circuit or over-temperature), the device enters a protected state. The system microcontroller should monitor the status output and implement appropriate actions, such as cycling the input after a cool-down period.
The BSP752 is particularly well-suited for automotive body electronics applications, including seat heaters, window lifters, and various powertrain systems, where reliability under harsh conditions is paramount.
ICGOOODFIND
The Infineon BSP752 PROFET™ power switch offers a highly integrated and protected solution for high-current switching, combining performance with comprehensive diagnostic features—making it a top choice for demanding automotive and industrial designs.
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Keywords:
PROFET™ Power Switch, High-Current Switching, Automotive Applications, Over-Current Protection, Load Diagnostics
