Summary
- Nexperia introduces push-pull transformer drivers for automotive applications
- Drivers provide 6 W of power delivery at up to 90% efficiency
- Devices are AEC-Q100 qualified for small, low-noise isolated power supplies
- Features include high output current, internal oscillator, and internal protection
- Available in compact SOT packages for safe operation in various temperatures
Article
Netherlands-based semiconductor company Nexperia has introduced a new line of push-pull transformer drivers designed for automotive applications. The NXF650x(A/B)-Q100 series offers up to 6 W of power delivery with high efficiency of up to 90%. These drivers are AEC-Q100 qualified and are suitable for use in traction inverters, motor control, DC-DC converters, battery management systems, and on-board chargers.
The NXF650x(A/B)-Q100 series can drive low-profile, center-tapped transformers from a 2.25 V to 5.5 V power supply with high output current (1.2 A at 5 V) and up to 90% efficiency. The devices feature internal oscillators with a frequency of 440 kHz (NXF6501 and NXF6505B) or 160 kHz (NXF6505A) and a gate drive circuit that produces complementary output signals to drive internal ground-referenced n-channel power switches. This allows for small form factor designs and efficient power delivery.
Additionally, the NXF6505A and NXF6505B models can accept an external clock signal for precise control of switching harmonics or synchronization of multiple devices. The series also incorporates slew rate control and spread-spectrum clocking (SSC) to reduce noise and electromagnetic interference. Internal protection features such as over-current protection, under-voltage lockout, thermal shutdown, and break-before-make circuitry ensure safe operation of the transformer drivers.
The NXF650x(A/B)-Q100 series is available in compact industry-standard footprints like the 5-pin SOT8098 (TSOT5) and 6-pin SOT8061 (TSOT6) package. These devices can operate in ambient temperatures ranging from -55° C to 125° C, making them suitable for a wide range of automotive applications. The transformer drivers also include a soft-start feature to prevent high inrush currents during power-up and fail-safe inputs to prevent back-powering of the local power supply, eliminating the need for power sequence management.
In conclusion, Nexperia’s NXF650x(A/B)-Q100 series of push-pull transformer drivers offer high power delivery efficiency, compact design, and a range of internal protection features, making them ideal for various automotive applications. With their ability to drive low-profile transformers with high output current and efficiency, these devices provide a reliable solution for designing isolated power supplies in automotive systems. The inclusion of features like slew rate control, spread-spectrum clocking, and fail-safe inputs further enhances the performance and safety of the transformer drivers.
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