2012-03-27OnSemiNCL30051輸入90－265Vac60W離線LED驅(qū)動(dòng)方案

作者：時(shí)間：2012-03-27 來(lái)源：網(wǎng)絡(luò)

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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(shí)現(xiàn)高效率和小型LED驅(qū)動(dòng)器/電源所需的所有功能,包括臨界導(dǎo)通模式(CrM) PFC升壓控制器和內(nèi)置的600V驅(qū)動(dòng)器的半橋諧振控制器,主要用于高效LED驅(qū)動(dòng)器和電源,電控制齒輪以及照明鎮(zhèn)流器.本文介紹了NCL30051主要特性,方框圖,典型應(yīng)用電路以及60W評(píng)估板NCL30051LEDGEVB指標(biāo),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(yīng)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(jiǎn)化應(yīng)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(píng)估板外形圖

評(píng)估板NCL30051LEDGEVB指標(biāo):

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)