Fuel pump

The fuel pump ECU is generally placed outside the fuel tank, while the pump itself is located within. This results in long wires between the ECU and the motor and this, in turn, calls for slow switching speeds to minimize EMI. As slow switching results in higher power dissipation, designers have to strike the right balance between switching speed and dissipation.

Furthermore, ECU cooling presents its own design challenges because the fuel pump runs continuously and the ECU is often positioned below the rear seat, where it has limited cooling capabilities. Infineon’s integrated half-bridge NovalithIC™ are an ideal solution to address these challenges.

Medium integration level: Integrated high-current half-bridge

The integrated high-current half-bridge NovalithIC™ is the ideal way to minimize power dissipation for a given target switching time / slew rate. By following the slew rate specifications in the data sheet and selecting the value according to the individual EMI requirements, designers can achieve the lowest “worst case” power dissipation value (compared with a discrete MOSFET).

With only one single cooling area both the high-side and low-side current switching can be covered. Furthermore, NovalithIC™ comes with overtemperature shutdown and latch behavior to protect the MOSFETs thermally. Thanks to the thermal feedback, NovalithIC™ also enhances switching speeds for lower switching losses.
 

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Innovative boards to enhance product development