On SemiNCL30051輸入90－265Vac60W離線LED驅動方案

On Semi 公司的NCL30051是用于離線LED照明解決方案的PFC和半橋諧振組合控制器,集成了實現高效率和小型LED驅動器/電源所需的所有功能,包括臨界導通模式(CrM) PFC升壓控制器和內置的600V驅動器的半橋諧振控制器,主要用于高效LED驅動器和電源,電控制齒輪以及照明鎮流器.本文介紹了NCL30051主要特性,方框圖,典型應用電路以及60W評估板NCL30051LEDGEVB指標,電路圖和材料清單(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典型應用:

High Efficiency LED Drivers and Power Supplies

Electronic Control Gear

Lighting Ballasts

圖1.NCL30051功能方框圖

圖2.NCL30051簡化應用方框圖

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.

圖3.60W NCL30051LEDGEVB評估板外形圖

評估板NCL30051LEDGEVB指標:

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)

圖4.NCL30051LEDGEVB評估板初級邊電路圖

圖5.NCL30051LEDGEVB評估板次級邊電路圖

圖6.DIM卡電路圖

NCL30051LEDGEVB評估板材料清單(BOM):