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Infineon IDP2303120W PFC+LLC Converter Reference Design Manual
Infineon's IDP2303 is a multi-mode PFC and LLC controller that combines an integrated digital engine, offering advanced algorithms for efficient multi-mode operation across the entire load range. This device features a high-voltage 600V start-up unit with enhanced performance, enabling low standby power consumption through its transmit mode. The UART interface allows for easy communication and in-circuit configuration, making it ideal for applications such as LCD TV power supplies, general-purpose switching power supplies (SMPS), and power adapters.
The IDP2303 integrates a floating high-side driver and a startup cell, supporting multi-mode operation with a digital engine that ensures maximum efficiency. It includes a comprehensive set of configurable protection features, along with a single-time-programming (OTP) unit to offer flexibility during design. These features make the IDP2303 a powerful solution for modern power supply systems.
Key highlights of the IDP2303 include:
- Integrated 600V start-up cell
- Floating driver based on coreless transformer technology
- Digital multi-mode operation for improved efficiency
- Low standby power via direct X-cap discharge and advanced burst mode control
- Elimination of auxiliary power supply through integrated start-up and burst mode
- UART interface for communication and configuration
- Flexible design with one-time programming for parameter customization
Main features of the IDP2303 include:
- Multi-mode PFC
- Configurable PFC gate driver
- Synchronous PFC and LLC burst mode control
- Configurable non-linear LLC VCO curve
- Configurable soft-start
- VAC input sensing and X-cap discharge via HVPin
The IDP2303 is widely used in applications such as LCD TVs ranging from 75W to 300W and general-purpose SMPS. The device is particularly well-suited for TV power systems, where efficiency and compact design are crucial.
The demo board described here is a 120W SMPS using the IDP2303, a second-generation digital combi controller in a 16-pin package. Designed specifically for TV power systems, the IDP2303 combines multi-mode PFC and half-bridge LLC control, significantly improving efficiency—especially under light loads. The integration of a high-voltage start-up cell, PFC regulator, MOSFET drivers, and internal communication between controllers reduces system costs and eliminates the need for an auxiliary power supply. With active X-CAP discharge and support for low standby power during burst mode, the IDP2303 offers excellent performance and reliability.
In this reference design, DPAK MOSFETs are used instead of traditional FullPAK packages, making the SMPS board thinner and easier to assemble. Two IPD60R400CE MOSFETs are used in parallel for the PFC stage, while two IPD60R1K5CE MOSFETs are employed in the LLC stage.
The document provides detailed information about the DEMO-IDP2303-120W PFC+LLC converter, including block diagrams, application circuits, circuit diagrams, BOM, and PCB layout. Figures show the outline drawing, top view, and key specifications of the demo board, offering a complete overview of the design and functionality.