详解STNRG011多模式PFC控制器解决方案

ST公司的STNRG011是多模式PFC控制器,包括用于LLC谐振半桥的高压双端控制器, 800V起动电压发生器以及优化管理三个区块的数字引擎,主要用在开放式开关电源(SMPS),平板TV开关电源,ATX电源和AC/DC适配器.本文介绍了STNRG011主要特性,框图和详细框图,典型应用电路图以及基于STNRG011和SRK2001的12V/150W电源评估板EVLSTNRG011-150主要特性和指标,电路图和材料清单.

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应用:

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

图1. STNRG011框图

图2. STNRG011详细框图

图3. STNRG011典型应用电路图

基于STNRG011和SRK2001的12V/150W电源评估板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.

评估板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

图4. 评估板EVLSTNRG011-150外形图
评估板EVLSTNRG011-150主要指标:

图5.评估板EVLSTNRG011-150框图

图6.控制回路参考电路图

图7.评估板EVLSTNRG011-150电路图:主板电路

图8.评估板EVLSTNRG011-150电路图:反馈(控制)板电路

图9.评估板EVLSTNRG011-150电路图:同步整流(SRK)板电路
评估板EVLSTNRG011-150材料清单:

评估板EVLSTNRG011-150反馈(控制)板材料清单:

评估板EVLSTNRG011-150同步整流(SRK)板材料清单: