Digital LLC Converter Reference Design

The converter board system converts 390 V DC to 12 V/21 A, reaching over 96% effectivity. It’s designed for protected use in labs and handles excessive voltages effectively.

The high-voltage resonant converter board (HVP-LLC) from NXP Semiconductors, paired with the HVP-KV46F150 controller card, varieties a system for a 250-W energy provide with a 390 V DC enter and a 12 V/21 A output. This setup incorporates GaN low-loss switches and a digitally-controlled synchronous rectifier, reaching efficiencies over 96% throughout a broad load spectrum. The system contains the controller card and the principle board.

The board set operates with excessive voltages that pose dangers {of electrical} shock, fireplace hazards, or private harm if not correctly managed. Use this board with warning and implement security measures to forestall hurt or injury. It’s appropriate just for people acquainted with high-voltage electrical programs and ought to be used solely in a laboratory surroundings.

The high-voltage energy stage ought to be powered by a current-limited laboratory energy provide for protected operation. If a non-isolated energy provide is used, one should pay attention to potential variations in floor potentials between the ability stage and the oscilloscope, until the oscilloscope is floating. It’s suggested to train warning, as each probe grounds and a floating oscilloscope can carry harmful voltages.

The necessity to improve the ability density of switched-mode energy provides (SMPS) compels designers to go for greater switching frequencies. Nevertheless, this improve in frequency results in better switching losses in Pulse Width-Modulated (PWM) converters, lowering total effectivity. Though greater frequencies enable for smaller passive elements, saving area, this profit is usually offset by the necessity for bigger warmth sinks or compelled cooling programs. Consequently, SMPS designers are regularly trying to find methods to scale back these switching losses. One efficient method to handle these points is the usage of resonant converter topologies. Resonant converters incorporate a resonant circuit inside the conversion pathway.

The LLC resonant topology provides a number of advantages over different resonant topologies. Most switched-mode energy provides incorporate a transformer to realize galvanic isolation or to regulate enter/output voltage ranges. The inclusion of a transformer within the LLC resonant topology offers extra benefits.

The principle board includes a vary of specs designed to accommodate numerous wants. It helps an enter voltage of 330-390 V DC and may ship an output energy of as much as 250 W. The output voltage is ready at 12 V, with a capability to deal with an output present of as much as 21 A. It operates at a switching frequency vary of 75-300 kHz and incorporates GaN low-loss switches. The board is provided with passive cooling, a digitally-controlled synchronous rectifier, and bolstered galvanic isolation for enhanced security. It additionally consists of over-current and over-voltage safety mechanisms. For connectivity and monitoring, the board options an SM-bus interface, a serial interface, and analog sensing for output voltage, output present, and resonant circuit present. Moreover, it helps a number of MCU playing cards and features a load change for step-response tuning.

NXP has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) structure, and extra. The corporate’s web site has extra knowledge in regards to the reference design. To learn extra about this reference design, click on right here.