In the automotive industry, ensuring the reliability of electrical systems is crucial, especially in scenarios involving load dump—one of the most severe electrical disturbances. The ISO 16750-2 pulse 5a outlines the requirements for testing the robustness of automotive electrical and electronic components under such stress conditions.
Load dump, typically caused by the sudden disconnection of a battery from the alternator while the engine is running, generates a high-energy voltage spike that can reach up to 100V in 12V systems and 200V in 24V systems. Protecting sensitive electronic components from these surges is a major challenge for automotive engineers.
Traditionally, the protection against load dump is achieved using transient voltage suppression (TVS) diodes. For instance, a 6.6kW TVS diode is commonly used to absorb the high-energy pulses generated in load dump situations. However, this can lead to the need for oversized components and added complexity in system design. To address this issue more effectively, Firstohm introduces an innovative approach using the SWM wirewound resistors.
ISO16750-2 Pulse 5a:
Recommended Solution
For automotive applications (ex: 12V system) that need to meet the stringent ISO 16750-2 5a load dump test, the combination of the SWM (anti-surge wirewound resistor) and a 3.3kW or 5kW TVS diode is the optimal solution. This configuration offers enhanced surge protection, reduced component sizes, and better thermal performance, ultimately improving system reliability and cost-effectiveness.
Recommended Circuit Designs
12V System:
24V System:
Test Result:
Key Advantages of Firstohm’s SWM Series
- SMD enabled structure
- Enhanced weld spot is reliable against high surge
- Flameproof multi-layer coating meet UL94 V-0
- Mechanical strength against thermal shock & vibration
For more information on how Firstohm’s SWM series anti-surge wirewound resistors can enhance your automotive load dump protection, visit 👉 www.firstohm.com
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