NXP SSL21083高压8W LED驱动解决方案

发布时间：2011-12-10 21:50 发布者：1770309616

NXP公司的SSL2108x系列是高压LED驱动器,集成了300V(SSL21081和 SSL21082)或多或少(SSL21083和SSL21084),开关接通采用零电流开关(ZCS),开关关断采用零电压或谷底电压开关,输出信号采用PWM调制,主要用在输入电压100V/120VAC和230VAC的紧凑型LED照明.本文介绍了SSL2108X主要特性和优势,框图, 基本应用框图,
SSL21083参考板主要指标,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 (see Figure 4) 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3.SSL21081/SSL21083降压应用配置

SSL21083参考板

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 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.