原标题：Powerint PFS7326H 150W LED街灯照明电源解决方案

　　powerint公司的HiperPFS-2系列产品集成了不连续导通模式(CCM)升压PFC控制器,栅极驱动器,超低反向恢复(Qspeed)二极管和高压功率 MOSFET,和EN61000-3-2 Class D 与Class C兼容,主要用于75W到425W的PFC应用如PC,大功率适配器,打印机,大功率LED照明,LCD TV,工业电器,视频游戏控制台和通用PFC转换器.本文介绍了HiperPFS-2系列产品亮点和主要优势,功能框图,典型应用电路,以及150W用于 LED街灯照明的PFC LLC电源参考设计主要指标,电路图,材料清单和PCB元件布局图.

　　The HiperPFS-2 device family members reach a very high level of integration including a continuous conduction mode (CCM) boost PFC controller, gate driver, ultra-low reverse recovery (Qspeed) diode (eSIP™ package options) and high-voltage power MOSFET in a single, low-profile CoolPAD (GROUND pin connected) power package that is able to provide near unity input power factor. The HiperPFS-2 devices eliminate the PFC converter’s need for external current sense resistors, the power loss associated with those components, and leverages an innovative control technique that adjusts the switching frequency over output load, input line voltage, and even input line cycle. This control technique is designed to maximize efficiency over the entire load range of the converter, particularly at light loads. Additionally, this control technique significantly minimizes the EMI filtering requirements due to its wide bandwidth spread spectrum effect. The HiperPFS-2 also features an integrated non-linear amplifier for enhanced load transient response, a user programmable power good (PG) signal as well as user selectable power limit functionality. HiperPFS-2 includes Power Integrations’ standard set of comprehensive protection features, such as integrated soft-start, UV, OV, brown-in/out, and hysteretic thermal shutdown. HiperPFS-2 also provides cycle-by-cycle current limit for the power MOSFET, power limiting of the output for overload protection, and pin-to-pin short-circuit protection.

　　HiperPFS-2’s innovative variable frequency continuous conduction mode of operation (VF-CCM) minimizes switching losses by maintaining a low average switching frequency, while also varying the switching frequency in order to suppress EMI, the traditional challenge with continuous conduction mode solutions. Systems using HiperPFS-2 typically reduce the total X and Y capacitance requirements of the converter, the inductance of both the boost choke and EMI noise suppression chokes, reducing overall system size and cost. Additionally, compared with designs that use discrete MOSFETs and controllers, HiperPFS-2 devices dramatically reduce component count and board footprint while simplifying system design and enhancing reliability. The innovative variable frequency, continuous conduction mode controller enables the HiperPFS-2 to realize all of the benefits of continuous conduction mode operation while leveraging low-cost, small, simple EMI filters.

　　Many regions mandate high power factor for many electronic products with high power requirements. These rules are combined with numerous application-specific standards that require high power supply efficiency across the entire load range, from full load to as low as 10% load. High efficiency at light load is a challenge for traditional PFC approaches in which fixed MOSFET switching frequencies cause fixed switching losses on each cycle, even at light loads. Besides featuring relatively flat efficiency across the load range, HiperPFS-2 also enables higher power factor at light loads. HiperPFS-2 simplifies compliance with new and emerging energy-efficiency standards over a broad market space in applications such as PCs, LCD TVs, notebooks, appliances, pumps, motors, fans, printers, and LED lighting.

　　HiperPFS-2 advanced power packaging technology and high efficiency simplifies the complexity of mounting the package and thermal management, while providing very high power capabilities in a single compact package; these devices are suitable for PFC applications from 75 W to 425 W.

　　HiperPFS-2系列产品亮点:

　　Protected Power Factor Correction Solution

　　•Incorporates high-voltage power MOSFET, ultra-low reverse recovery loss Qspeed diode, controller, and gate driver

　　•EN61000-3-2 Class D and Class C compliance

　　•Integrated protection features reduce external component count

　　Accurate built-in brown-in/out protection

　　Accurate built-in undervoltage (UV) protection

　　Accurate built-in overvoltage (OV) protection

　　Hysteretic thermal shutdown (OTP)

　　Internal power limiting function for overload protection

　　Cycle-by-cycle power switch current limit

　　Internal non-linear amplifier for enhanced load transient response

　　•No external current sense required

　　Provides ‘lossless’ internal sensing via sense-FET

　　Reduces component count and system losses

　　Minimizes high current gate drive loop area

　　•Minimizes output overshoot and stresses during start-up

　　Integrated power limit and frequency soft-start

　　Improved dynamic response Input line feed-forward gain adjustment for constant loop gain across entire input voltage range

　　•Eliminates up to 40 discrete components for higher reliability and lower cost

　　Intelligent Solution for High Efficiency and Low EMI

　　•Continuous conduction mode PFC uses novel constant volt/ amp-second control engine

　　High efficiency across load

　　High power factor across load

　　Low cost EMI filter

　　•Frequency sliding technique for light load efficiency improvements

　　>95% efficiency from 10% load to full load at nominal input voltages

　　•Variable switching frequency to simplify EMI filter design

　　Varies over line input voltage to maximize efficiency and minimize EMI filter requirements

　　Varies with input line cycle voltage by >60 kHz to maximize spread spectrum effect

　　Advanced Package for High Power Applications

　　•Up to 425 W peak output power capability in a highly compact package

　　•Simple adhesive or clip mounting to heat sink

　　No insulation pad required and can be directly connected to heat sink

　　•Staggered pin arrangement for simple routing of board traces and high-voltage creepage requirements

　　•Single package solution for PFC converter reduces assembly costs and layout size

　　HiperPFS-2系列产品主要优势:

　　•Highly integrated for smallest boost PFC form factor

　　Integrated controller and MOSFET in all package options

　　Ultra-low reverse recovery loss diode (Qspeed) included in extended eSIP™ package option

　　Lossless internal current sense reduces component count and system losses

　　EN61000-3-2 Class C and D compliant

　　•Packaging optimized for high volume production

　　Exposed pad connected to GROUND pin (CoolPAD)

　　Eliminates insulating pad/heat-spreader

　　•Enhanced features

　　Programmable power good (PG) signal

　　User selectable power limit: Enables device swapping in a given design to optimize efficiency/cost

　　Integrated non-linear amplifier for fast output OV and UV protection

　　•High efficiency and power factor across load range >95% efficiency from 10% load to full load

　　<200 mW no-load consumption at 230 VAC in remote off-state

　　Light load PF >0.9 at 20% load on optimized designs >200 W

　　PF >0.95 at 50% load

　　Enables 80+ Platinum designs

　　•Frequency adjusted over line voltage and each line cycle

　　Spread-spectrum across >60 kHz window simplifies EMI filtering requirements

　　Lower boost inductance

　　•Provides up to 425 W peak output power

　　>425 W peak power in power limit voltage regulation mode

　　•Protection features include: UV, OV, OTP, brown-in/out, cycle-by-cycle current limit and power limiting for overload protection

　　•Halogen free and RoHS compliant

　　HiperPFS-2系列产品应用:

　　•PC

　　• High-power adaptors

　　•Printer

　　• High-power LED lighting

　　•LCD TV

　　• Industrial and appliance

　　•Video game consoles

　　• Generic PFC converters

　　图1. HiperPFS-2系列产品功能框图

　　图2. HiperPFS-2系列产品典型应用电路

　　采用HiperPFSTM-2 (PFS7326H)和HiperLCSTM(LCS702HG)的150W PFC LLC电源参考设计This engineering report describes a 43 (nominal) V, 150 W reference design for a power supply for 90-265 VAC LED street lights and other high power lighting applications. The power supply is designed with a constant current output in order to directly drive a 150 W LED panel with 43-44 V drop.

　　The design is based on the PFS7326H for the PFC front-end and a LCS702HG for the LLC output stage.

　　150W PFC LLC电源参考设计主要特性:

　　 Integrated PFC stage and LLC stage for a very low component count design

　　 Continuous mode PFC using low cost ferrite core

　　 High frequency (250 kHz) LLC for extremely small transformer size.

　　 >95% full load PFC efficiency at 115 VAC

　　 >95% full load LLC efficiency

　　 System efficiency 91% / 93% at 115 VAC / 230 VAC

　　 Start-up circuit eliminates the need for a separate bias supply

　　 On-board current regulation and analog dimming circuit

　　图3. 150W PFC LLC电源参考设计外形图:顶层

　　图4. 150W PFC LLC电源参考设计外形图:底层

　　150W PFC LLC电源参考设计主要指标:

　　图5. 150W PFC LLC电源参考设计电路图(1):输入滤波器,PFC功率级和偏压电源

　　图6. 150W PFC LLC电源参考设计电路图(2):LLC级

　　150W PFC LLC电源参考设计材料清单: