原标题：NXP SSL2108x高效率通用照明LED驱动器参考设计

　　nxp公司的SSL2108x系列是高压集成电路,主要用来驱动通用照明的无调光的LED灯,效率大于95%.器件集成了300 V或600 V功率开关,具有多种保护功能如欠压锁住(UVLO), 前沿消隐(LEB),过流保护(OCP),短绕组保护(SWP),超温保护(OTP)以及短路保护(OSP)等.本文介绍了SSL2108X主要特性和优势,方框图, 基本应用框图和降压转换器配置图以及评估板主要特性,电路图和材料清单(BOM).

　　The SSL2108X is a range of high-voltage Integrated Circuits (ICs), intended to drive non-dimmable retrofit 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 buck converters. The IC range has been designed to start up directly from the HV supply by an internal high-voltage current source. Followed by the dV/dt supply using capacitive coupling from the drain, or any other auxiliary supply. This functionality provides full flexibility in the application design. The supply current consumed by the IC is 1 mA, an internal clamp limits the supply voltage.

　　The ICs provide accurate output current control with greater than 5 % LED current accuracy. 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 or 600 V 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 without additional components

　　Option for soft-start function

　　Hotaru switch compatible during standby1

　　IC lifetime easily matches or surpasses LED lamp lifetime

　　SSL2108X应用:

　　SSL2108X products are intended for compact LED lamp ballasts 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

　　图3. SSL21081/SSL21083降压转换器配置图

　　图4. SSL21082/SSL21084降压转换器配置图

　　火线电压230VAC 50Hz评估板

　　The board is optimized for a 230 V (AC, 50 Hz) mains supply. In addition to the mains voltage optimization, the board is designed to work with multiple LEDs or an LED module with a high forward voltage.

　　Mains connection of this reference board is different from other general evaluation/demo boards. Connect the mains to the screw connector J6.

　　Remark: The maximum rated voltage of the board is 280 V (limited by the value of electrolytic capacitor C1) or 400 V (DC).

　　The anode of the LED load is connected to positive positions 1 to 3 of connector J5. The cathode is connected to negative positions 4 to 6 of connector J5.

　　Use an LED string with a VF greater than 20 volt on this board. Under the expected conditions, the output current is 96 mA. If the rated current of the LED does not meet this specification, the current can be adjusted.

　　图5.评估板外形图

　　评估板电源指标:

　　图6.评估板电路图

　　评估板材料清单: