On SemiNCL30051输入90－265Vac60W离线LED驱动方案

On Semi 公司的NCL30051是用于离线LED照明解决方案的PFC和半桥谐振组合控制器,集成了实现高效率和小型LED驱动器/电源所需的所有功能,包括临界导通模式(CrM) PFC升压控制器和内置的600V驱动器的半桥谐振控制器,主要用于高效LED驱动器和电源,电控制齿轮以及照明镇流器.本文介绍了NCL30051主要特性,方框图,典型应用电路以及60W评估板NCL30051LEDGEVB指标,电路图和材料清单(BOM).

NCL30051LEDGEVB:60W 90-265 Vac 35-50 V Constant Current up to 1.5A Isolated LED Driver

The NCL30051 is a combination of PFC and half−bridge resonant controllers optimized for off−line LED lighting solutions. This device integrates all the features needed to implement a highly efficient and small form factor LED Driver/Power Supply. It contains a critical conduction mode (CrM) power factor correction (PFC) boost controller and a half−bridge resonant controller with a built−in 600 V driver. The half−bridge stage operates at a fixed frequency, greatly simplifying the control implementations. The output (current or voltage) regulation is achieved by adjusting the PFC stage output voltage − based on a control signal generated external to the NCL30051.

This device includes an enable input on the PFC feedback pin, open feedback loop protection and PFC overvoltage and undervoltage detectors. Other features included in the NCL30051 are a 600 V startup circuit and an adjustable frequency oscillator with a divide by 2 circuit to assure true symmetric duty ratio. The controllers are properly sequenced, simplifying system design.

NCL30051主要特性:

Voltage Mode CrM Power Factor Correction Controller

PFC Open Feedback Loop Protection

PFC Undervoltage Detector

PFC Overvoltage Detector

Half−Bridge Stage with 600 V High Side Gate Drive

State Machine Ensures Proper Turn−on and Turn−off of Half−Bridge Stage

Controllers are Properly Sequenced for Fault Free Operation

Non−Latching Fault Management

Internal 600 V Startup Circuit

Wide Temperature Range of −40C to +125C

This is a Pb−Free Device

NCL30051典型应用:

High Efficiency LED Drivers and Power Supplies

Electronic Control Gear

Lighting Ballasts

图1.NCL30051功能方框图

图2.NCL30051简化应用方框图

This is a fully isolated up to 60 W, 90-265 Vac off-line, power factor corrected, constant current LED driver using ON Semiconductor’s new NCL30051 two-stage controller. This controller contains the control circuitry for both a critical conduction mode (CRM) boost power factor corrector (PFC), and a fixed frequency, series resonant half-bridge converter, and is housed in a 16 pin SOIC package. The driver is designed to support strings of LEDs that have a forward voltage ranging from 35-50 V and has a nominal driver current of 1000 mA although the current can be increased to 1500 mA with simple component changes on the board. This specific driver design is tailored to support LEDs such as the Cree XLAMP™ XP-G and XM-L, and OSRAM Golden DRAGON™ Plus that have maximum drive currents of at least 1000 mA. This board has supports a range of flexible dimming options including bi-level, PWM and analog dimming. Details of the demo board are described in evaluation board manual EVBUM2039/D.

图3.60W NCL30051LEDGEVB评估板外形图

评估板NCL30051LEDGEVB指标:

Universal Input: 90 − 265 Vac (up to 305 Vac with component changes)

Frequency 47 − 63 Hz

Power Factor: > 0.9 (50−100% of Load with dimming)

Harmonic Content EN61000−3−2 Class C Compliance

Efficiency > 88% at 50 −100% of 50 W, Iout = 1 A / Vf = 50 V

Target UL1310 Class 2 Dry/Damp, isolated < 100 VA and < 60 V peak

Vmax Range: 35 to 50 Vdc (selectable by resistor divider)

Constant Current

Iout Range: 0.7 − 1.5 A, 1 A nominal (selectable by resistor)

Vout Compliance >50 to 100% of Vout

Current Tolerance 2% or better

Cold Startup < 1 sec typical to 50% of load

Pout Maximum: 60 W

Dimming: Two Step Bi−level Analog Dimming

PWM dimming with optional DIM board

PWM dimming frequency 160 Hz –300 Hz with external signal input (referenced to a secondary side signal ground)

Dimming range > 10:1

0−10 V (100K) analog voltage input dimming, 1 = minimum, 10 V is 100%

on (range dependent on nominal AC input)

Protection: Short Circuit Protection

Open Circuit Protection < 60 V peak

Over Temperature – (optional)

Over Current Protection − Auto recovery

Over voltage protection (input and optional output)

图4.NCL30051LEDGEVB评估板初级边电路图

图5.NCL30051LEDGEVB评估板次级边电路图

图6.DIM卡电路图

NCL30051LEDGEVB评估板材料清单(BOM):