ST公司的STNRG011是多模式PFC控制器,包括用于LLC諧振半橋的高壓雙端控制器, 800V起動電壓發生器以及優化管理三個區塊的數字引擎,主要用在開放式開關電源(SMPS),平板TV開關電源,ATX電源和AC/DC適配器.本文介紹了STNRG011主要特性,框圖和詳細框圖,典型應用電路圖以及基于STNRG011和SRK2001的12V/150W電源評估板EVLSTNRG011-150主要特性和指標,電路圖和材料清單.

The STNRG011 embodies a multi-mode (transition-mode and DCM) PFC controller, a highvoltage double-ended controller for the LLC resonant half-bridge, an 800 V-rated startup? generator and a sophisticated digital engine, that manage optimal operation of three blocks.

The device comes in a 20-pin SO package and offers an advanced solution for power factor-corrected high-efficiency converters supposed to comply with the most stringent energy saving regulations.

The power system and the control algorithms are managed by an 8-bit core with dedicated fast peripherals (SMED). Optimized digital algorithms together with HW analog IPs are implemented to guarantee a very high performance, BOM optimization and robustness.

The digital algorithms are stored into an internal ROM memory and all key application
parameters can be stored into a device’s NVM (non-volatile memory) memory during the
production phase allowing wide configurability and calibration.

The device can also externally communicate through a 2-pin UART, allowing the monitoring function, the black box storing into an external E2PROM and the software patch upload from the external E2PROM.

STNRG011主要特性:

Digital combo multi-mode PFC + time-shift LLC resonant half-bridge controller
?Onboard 800 V startup circuit, line sense and X-cap discharge compliant with IEC 62368-1, for reduced standby power
?Enhanced fixed on time multi-mode TM PFC controller with input voltage feedforward, THD optimizer and frequency limitation
?Complete set of PFC protections
?Time-shift control of resonant half-bridge
Enhanced burst-mode at light load with fast ransient response and line adaptive halfbridge brown-out protection
?Complete set of half-bridge protections
?Available in SO20 package

STNRG011應用:

?Open frame SMPS
?Flat screen TV SMPS
?ATX power supply
?AC-DC adapter

圖1. STNRG011框圖

圖2. STNRG011詳細框圖

圖3. STNRG011典型應用電路圖

基于STNRG011和SRK2001的12V/150W電源評估板EVLSTNRG011-150

The EVLSTNRG011-150 is a 12 V, 150 W power supply demonstration board for 90 V ac to 264 V ac mains, which is representative of an AC/DC converter for an all in one (AIO) computer or a general purpose high power adapter.

The design is based on the STNRG011 IC, a digital combo that controls a two-stage AC/DC SMPL. The front-end is a transition mode PFC pre-regulator and the second stage is an LLC HB resonant converter. The SRK2001 implements the synchronous rectification in order to obtain higher efficiency.

No auxiliary supply is needed due to the very low consumption at no load.A full set of auxiliary functions and protection is also provided, this allows reduction of the overall BOM while maintaining a rugged design.

The performances of the EVLSTNRG011-150 can meet the requirements of major standards ENERGY STAR? for computers ver. 6.1, EuP Lot 6 Tier 2, European CoC ver. 5 Tier-2, in terms of efficiency, no-load input power and power factor and feature harmonics content well below the limits of European Standard EN61000-3-2 Class-D and Japanese standard JEITA-MITI Class-D regulations.

評估板EVLSTNRG011-150主要特性:

?Digital controller: STNRG011
?TM PFC with resonant HB-LLC converter
Input voltage range: 90 ? 264 V ac
?12 V ± 5% CV output regulation
?Full-load power: 150 W continuous operation
Peak power loading: 200 W
?Full-load and average efficiency: greater than 90% at 115/230 V ac
?Peak efficiency: greater than 93%
?No-load mains consumption: less than 75 mW
?Hold-up time: greater than 10 ms
Full set of programmable parameters
?High flexibility thanks to the configurable NVM
Black box functionality with the installed EEPROM

圖4. 評估板EVLSTNRG011-150外形圖
評估板EVLSTNRG011-150主要指標:

圖5.評估板EVLSTNRG011-150框圖

圖6.控制回路參考電路圖

圖7.評估板EVLSTNRG011-150電路圖:主板電路

圖8.評估板EVLSTNRG011-150電路圖:反饋(控制)板電路

圖9.評估板EVLSTNRG011-150電路圖:同步整流(SRK)板電路
評估板EVLSTNRG011-150材料清單:

評估板EVLSTNRG011-150反饋(控制)板材料清單:

評估板EVLSTNRG011-150同步整流(SRK)板材料清單: