基于IDP2308 120W開關電源(SMPS)的參考設計方案

infineon公司的IDP2308是多模式PFC和LLC控制器，組合了浮動高邊驅動器和起動單元。數字引擎提供多模式運行的先進算法，支持整個負載范圍內的最高效率，并具有綜合和可配置的保護特性，集成的高壓（HV）600V起動單元和先進的突發模式能獲得低待機功耗。此外，集成的一次性編程（OTP）單元提供大范圍可配置參數，使得容易設計.IDP2308書數字組合LLC控制器，支持多模式PFC和半橋LLC級的應用拓撲。多功能引腳保證了應用時非常低的元件數量。器件的UART 接口用來通信和在電路配置。主要用在LCD-TV 75W ~ 300W和通用開關電源（SMPS）。本文介紹了IDP2308產品亮點和主要特性，框圖和典型應用圖，以及DEMO-IDP2308-120W PFC+LLC轉換器主要指標，電路圖，材料清單和PCB設計圖。

The IDP2308 is a multi-mode PFC and LLC controller combined with a floating high side driver and a startup cell. A digital engine provides advanced algorithms for multi-mode operation to support highest efficiency over the whole load range. A comprehensive and configurable protection feature set is implemented. Only a minimum of external components are required with the low pin count DSO-14 package. The integrated HV startup cell and advanced burst mode enable to achieve low stand-by power. In addition a one-time-programming （OTP） unit is integrated to provide a wide set of configurable parameters that help to ease the design in phase.

The IDP2308 is a digital Combo-LLC controller to support application topologies with a multi-mode PFC and half-bridge LLC stage. The IC consists of a smart digital core that provides advanced algorithms for multi-mode operation and a variety of protection features. A high degree of forward integration is realized by implementing a floating HV gate driver and a HV startup cell in a slim PG-DSO-14 package. Multifunctional pins ensure a very low component count in the application. General controller features are summarized in Table 2.

The IC supports highest design-in flexibility in the application by means of an advanced set of configurable parameters. The configuration can be done via a half duplex UART interface at pin MFIO.

IDP2308產品亮點：

? Integrated 600V startup cell

? Integrated floating driver based on coreless transformer technology

? Digital multi-mode operation for higher efficiency curve

? Supports low stand-by power by means of direct X-cap discharge function and advanced burst mode control

? Eliminates the auxiliary power supply by means of integrated startup cell and burst mode

? UART interface for communication and in-circuit configuration

? Flexible design-in by means of one time programming capability for a wide range of parameters

IDP2308主要特性：

? 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 voltage sensing and X cap discharge via HV pin

IDP2308應用：

? LCD-TV 75W ~ 300W

? Generarl SMPS

圖1.IDP2308框圖

圖2.IDP2308典型應用圖

系統主要指標：

采用IDP2308的120 W 24 V 3.5 A 12 V 3 A 開關電源演示板DEMO-IDP2308-120W

The demo board described in this document is a 120 W SMPS using a digital PFC-LLC combi controller （the IDP2308）， which is the second generation of digital combi controller with a 16pin package developed by Infineon Technologies. TheIDP2308 is specially designed for switch mode power supplies used in TV power system applications.

The IDP2308 is a highly integrated multi-mode power factor correction （PFC） and half-bridge LLC （HB LLC） controller. Multi-mode operation of the PFC controller and zero voltage switching of the LLC MOSFETs can significantly increase the power conversion efficiency， especially light load efficiency， while the system costs are minimized by the integrated high-voltage start-up cell， regulator for the PFC converter， MOSFET drivers and internal communication between the PFC and LLC controllers. The auxiliary power supply can be eliminated by the integrated high-voltage start-up cell and advanced burst mode control. With an active X-CAP discharge function， low stand-by power consumption during burst mode is supported. A comprehensive set of built-in protection features can greatly enhance the system operation and safety. Up to 40 different parameters ensure flexibility during system design and achieve optimal performance. All of these features make the IDP2308 a very competitive AC-DC controller for PFC-HB LLC resonant converter.

DPAK power MOSFETs are used in this reference design. For LED TVs， a slim SMPS board is a desire and also a challenge due to the limitations of active and passive components. Compared to FullPAK MOSFETs which are used in conventional TV SMPS design， DPAK MOSFETs have the advantage of being thinner and also easier to assemble. In this reference design， two IPD60R400CE are used in parallel for the PFC stage， and two IPD60R1K5CE are used in the LLC stage.