Design and Application of the NXP TEA1716T/2,518 High-Efficiency Resonant SMPS Controller

The NXP TEA1716T/2,518 is a highly integrated resonant switched-mode power supply (SMPS) controller designed for high-efficiency and high-power-density applications. Combining a power factor correction (PFC) controller and a resonant half-bridge (LLC) controller in a single package, it significantly simplifies the design of advanced power supplies for servers, industrial systems, flat-panel displays, and high-end adapters. Its architecture is optimized to achieve high efficiency across a wide load range, which is critical for meeting modern energy standards.

The controller operates the PFC stage in a critical conduction mode (CrM), ensuring a near-unity power factor and low total harmonic distortion (THD). This is essential for compliance with international regulations like ENERGY STAR and EU CoC. The subsequent LLC resonant stage is managed by a sophisticated controller that adjusts the switching frequency to regulate the output voltage. This resonant operation allows the main power switches to operate with zero-voltage switching (ZVS), drastically reducing switching losses and electromagnetic interference (EMI). This is a key factor in achieving system efficiencies often exceeding 95%.

A standout feature of the TEA1716T is its advanced burst mode operation. Under light-load or standby conditions, the controller intelligently disables switching cycles to minimize power consumption, enabling designs to achieve standby losses of less than 75mW. Furthermore, the IC incorporates comprehensive protection features, including over-voltage protection (OVP), over-current protection (OCP), over-temperature protection (OTP), and brown-in/out protection. These integrated safeguards enhance system reliability and robustness, reducing the need for external components.

In application, the design process begins with defining the key specifications: input voltage range, output power, and voltage. Using NXP's dedicated design tools, such as the GUI-based software, engineers can quickly calculate component values for both the PFC and LLC stages. The controller’s high level of integration minimizes the external component count, which reduces the PCB footprint and overall bill-of-materials (BOM) cost. Particular attention must be paid to the layout of the high-current resonant tank and the grounding scheme to ensure stable operation and minimize noise.

ICGOODFIND: The NXP TEA1716T/2,518 stands out as a premier solution for high-efficiency power conversion, integrating critical control and protection functions to enable compact, reliable, and energy-compliant SMPS designs with superior performance.

Keywords: Resonant LLC Converter, Power Factor Correction (PFC), Zero-Voltage Switching (ZVS), High-Efficiency, Burst Mode Operation.