原标题：NXP SSL21081 LED驱动器参考设计

　　nxp公司的SSL2108x系列是用于通用照明的高压LED驱动器,效率高达95%,具有低成本的材料清单(BOM)和小的PCB占位面积,容易实现紧凑的解决方案. SSL2108x系列集成了欠压锁住(UVLO),前沿消隐(LEB),过流保护(OCP),绕组短路保护(SWP)和内部超温保护(OTP).本文介绍了SSL2108X主要特性和优势,方框图,几种应用电路以及SSL21081 LED驱动器参考板主要特性,电路图和材料清单.

　　The SSL2108X is a range of high-voltage Integrated Circuits (ICs), intended to drive LED lamps in general lighting applications.

　　The main benefits of the product family are:

　　•Small Printed-Circuit Board (PCB) footprint, and compact solution

　　•High efficiency (up to 95 %)

　　•Ease of integration

　　•Low electronic Bill Of Material (BOM)

　　The product family is made of ICs with a range of internal HV switches for easy power scaling.

　　The ICs work as boundary conduction mode converters, typically in buck configuration. The IC range has been designed to start up directly from the HV supply by an internal high-voltage current source. Thereafter, the dV/dt supply is used with capacitive coupling from the drain, or any other auxiliary supply. This functionality provides full flexibility in the application design. The IC consumes 1.3 mA of supply current with an internal clamp limiting the supply voltage.

　　The ICs provide accurate output current control with LED current accuracy within 5%. The ICs can be operated using Pulse-Width Modulation (PWM) dimming and has many protection features including easy LED temperature feedback.

　　SSL2108X主要特性和优势:

　　LED driver IC family driving strings of LEDs from a rectified mains supply

　　High-efficiency switch mode buck driver product family:

　　Drivers with integrated 300 V (SSL21081 and SSL21082) or 600 V (SSL21083 and SSL21084) power switches

　　Controller with power-efficient boundary conduction mode of operation with:

　　No reverse recovery losses in freewheel diode

　　Zero Current Switching (ZCS) for turn-on of switch

　　Zero voltage or valley switching for turn-on of switch

　　Minimal required inductance value and size

　　Direct PWM dimming possible

　　Fast transient response through cycle-by-cycle current control:

　　Negligible AC mains ripple at LED current and minimal total capacitor value

　　No over or undershoots in the LED current

　　No binning on LED forward voltage required

　　Internal Protections:

　　UnderVoltage LockOut (UVLO)

　　Leading-Edge Blanking (LEB)

　　OverCurrent Protection (OCP)

　　Short-Winding Protection (SWP)

　　Internal OverTemperature Protection (OTP)

　　Brownout protection

　　Output Short Protection (OSP)

　　Low component count LED driver solution:

　　No Schottky diode required due to ZCS

　　No dim switch and high-side driver required for PWM dimming

　　Easy external temperature protection with a single NTC resistor

　　Option for soft-start function

　　Compatible with wall switches with built-in indication light during standby1

　　IC lifetime easily matches or surpasses LED lamp lifetime

　　SSL2108X应用:

　　SSL2108X products are intended for compact LED lighting applications with accurate fixed current output for single mains input voltages. Mains input voltages include 100 V, 120 V and 230 V (AC). The output signal can be modulated using a PWM signal.

　　图1.SSL2108X方框图

　　图2.SSL2108X基本应用框图(SO8型)

　　图3.SSL21081/83降压配置图

　　SSL21081 LED驱动器参考板

　　This document describes the performance, technical data and connection of the SSL21081 reference board. The SSL2108X series is an NXP Semiconductors driver IC intended to provide a low cost, small form factor LED driver. This board is intended to operate at 100 V (AC) or 120 V (AC), using an output voltage greater than 30 V.

　　The SSL21081 is a highly integrated switching mode LED driver which enables constant current driving from the AC mains input in a standard SO8 package. It is a solution for small LED retrofit lamp applications, especially those applications for low-power factor designs.

　　The SSL21081 supports buck converter topology and is suitable for non-isolated, non-dimmable LED retrofit lamps. It can drive a long LED string, up to a 70 V forward voltage and is most efficient in this type of LED module. The SSL2108 series is intended to operate at high output voltages.

　　This reference board is an example that can be used in applications up to E17 form factor lamp fittings.

　　This reference board is connected to a high AC voltage. Avoid touching the reference board during operation. An isolated housing is mandatory when used in uncontrolled, non-laboratory environments. Galvanic isolation of the mains phase using a fixed or variable transformer (Variac) is always recommended.

　　图4.SSL21081 LED驱动器参考板外形图:左:顶视图;右:底视图

　　图5.SSL21081 LED驱动器参考板电路图

　　SSL21081 LED驱动器参考板材料清单: