On February 6, 2025, WPG Holdings, an international leading distributor of semiconductor components dedicated to the Asia-Pacific market, announced that its subsidiary, YouShang, has launched a 6.6kW on-board electric vehicle (EV) charger solution based on onsemi's NCV4390, FAN9673Q, NVHL020N090SC1, NVHL060N090SC1, and other products.

The display board diagram of the 6.6kW on-board electric vehicle charger solution based on onsemi products from WPG Holdings

With the rapid development of the global new energy vehicle market, the number of electric vehicles continues to rise. At the same time, the on-board charger (OBC) technology is also continuously innovating and evolving. Against this backdrop, WPG YouShang has introduced an on-board EV charger solution based on onsemi's NCV4390, FAN9673Q, NVHL020N090SC1, NVHL060N090SC1, and other products. The solution employs advanced 3-phase interleaved PFC technology, which effectively improves charging efficiency and power density.

The application scenario diagram of the 6.6kW on-board electric vehicle charger solution based on onsemi products from WPG Holdings

In the design of lithium battery on-board chargers, an advanced single full-bridge LLC topology is used, and several excellent products from onsemi are integrated. By combining these high-performance components, not only is a compact design achieved, but the cost-effectiveness is significantly improved. These products include the FAN9673Q 3-phase interleaved CCM PFC IC, FFSP3065A SiC diode, NCP51705MNTXG SiC MOSFET driver, NCV2003SN2T1G low-voltage operational amplifier, NCV1077P060G switching regulator, NCV4390 PFM controller, NCV57000DWR2G IGBT driver, NCV890100PDR2G buck switching regulator, and NVHL020N090SC1 and NVHL060N090SC1 silicon carbide MOSFETs, among over ten other components. The combination of these products not only provides outstanding performance but also ensures the efficient operation of the on-board charger system.

1. Advantages of the NCV4390 PFM Controller

The NCV4390 PFM controller is designed to support LLC resonant converters with synchronous rectification (SR) capability. It is a key component in isolated DC/DC converters and provides best-in-class efficiency. The controller uses charge-controlled current mode control technology, combining the triangular wave of the oscillator with the integrated switch current information to effectively determine the switching frequency. This design not only optimizes the control of the power stage but also simplifies the feedback loop design, improving the overall system stability.

Additionally, the NCV4390 features true input power limiting and employs a closed-loop soft start function to prevent error amplifier saturation, ensuring smooth and monotonic output voltage rise, unaffected by load variations. The dual-edge tracking adaptive dead-time control helps minimize the conduction time of the body diode, effectively improving the system’s conversion efficiency.

2. Application of the FAN9673Q 3-Channel Interleaved CCM PFC IC

The FAN9673Q 3-channel interleaved CCM PFC IC plays an important role in the power factor correction of on-board chargers. This IC combines cutting-edge modulation techniques with an average current "boost" type PFC circuit, fully complying with the IEC1000-3-2 power design standards, ensuring high performance and stability of the device.

Notably, the FAN9673Q features an innovative channel management function. This function allows smooth loading and unloading of secondary channel power levels based on the voltage set at the CM pin, thereby improving the load transient response of the PFC converter. This optimization allows the FAN9673Q to enhance the dynamic performance of the power supply system, especially in cases of rapid load changes.

3. Collaborative Operation of Multiple High-Efficiency Products

In the design of on-board chargers, in addition to the aforementioned NCV4390 and FAN9673Q, the collaboration of several other components, such as the FFSP3065A SiC diode, NCP51705MNTXG SiC MOSFET driver, and NCV2003SN2T1G low-voltage operational amplifier, contributes to the system’s higher efficiency and reliability. Each component’s unique function plays an important role in specific power conversion processes.

For example, the FFSP3065A SiC diode offers high-frequency and low-loss advantages, making it particularly suitable for high power density applications. Meanwhile, the NCP51705MNTXG SiC MOSFET driver efficiently drives SiC MOSFETs, improving switching efficiency and thereby reducing the overall energy consumption of the system.

The block diagram of the 6.6kW on-board electric vehicle charger solution based on onsemi products from WPG Holdings

Through the application of these high-performance components, the on-board charger not only improves conversion efficiency but also strikes the perfect balance between compact design and cost-effectiveness.

Thanks to the outstanding performance and excellent design of these products, this on-board charger solution offers excellent thermal performance, ensuring the system operates stably under long-term, high-load conditions.