NCL30051LEDGEVB ON Semiconductor, NCL30051LEDGEVB Datasheet

NCL30051LEDGEVB

Manufacturer Part Number

NCL30051LEDGEVB

Description

Power Management IC Development Tools 90-265VAC 60W ISO CC EVB

Manufacturer

ON Semiconductor

Type

Power Factor Correctionr

Datasheet

1.NCL30051LEDGEVB.pdf (20 pages)

Specifications of NCL30051LEDGEVB

Rohs

yes

Product

Evaluation Boards

Tool Is For Evaluation Of

NCL30051

Input Voltage

90 VAC to 265 VAC

Output Voltage

35 V to 50 V

Output Current

1.5 A

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NCL30051LEDGEVB

35-50 Volt, Up to 1.5 Amp,

Offline Power Factor

Corrected LED Driver with

Flexible Dimming Options

Evaluation Board User's

Manual

Introduction

factor corrected, line isolated, 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 high level of integration and low pin count is

based on a novel control topology where the PFC output

bulk voltage is adjusted via closed loop to change the

amount of power transferred by the fixed duty cycle

half−bridge. The resonant half−bridge essentially functions

as a dc−to−dc step−down transformer. This approach is

simpler to implement and stabilize compared to the more

complex LCC topology where the frequency of the resonant

controller is varied to change the amount of power

transferred to the load. The fixed frequency and symmetrical

duty cycle of the resonant half−bridge clocking allows for

very simple transformer design. This topology is capable of

powering series LED loads with efficiencies reaching 90%.

This is mainly due to the CRM power factor corrector and

the very high efficiency of the resonant half−bridge which

results in zero current and voltage switching in the power

MOSFETs. Such efficiencies would be quite difficult using

a conventional flyback converter in the second stage.

Constant voltage, constant current control (CVCC) is

handled on the secondary side of the power circuit using

ON Semiconductor’s NCS1002 CVCC controller with

integrated reference. Although this particular design

represents a 60 W nominal application, the controller

topology is ideal for power levels to 200 W and higher. This

specific design is available as evaluation board

NCL30051LEDGEVB.

applications that would benefit from replacing the

traditional light source with an LED source including street

lights, refrigerator cases, parking garages, wall washers,

wall packs and architectural lighting. All of these

applications have high operating hours, challenging

environmental conditions, and can benefit from advanced

dimming control to further save energy. Moreover many of

November, 2011 − Rev. 1

This application note describes a 60 W, off−line, power

There are a wide variety of medium power lighting

these applications have accessibility issues that would

significantly reduce maintenance costs given the LEDs long

operating lifetime. This specific driver design is tailored to

support LEDs such as the Cree XLAMPt XP−G and

XM−L, and OSRAM Golden DRAGON

maximum drive currents of at least 1000 mA. These LEDs

exhibit good efficacies at higher drive currents allowing

fewer LEDs to be used to achieve the same light output. For

example, the Cree XLAMP XM−L is rated for up to 3 A

drive current and has a very low typical forward voltage of

3.1 V @ 1500 mA drive current. At 1500 mA and 85°C

junction temperature, in cool white, each LED generates

from 440−475 lumens typical with an efficacy of greater

than 100 lm/W. So with just 12 LEDs, the source lumen

output would be in the range of 5200−5700 lumens at 85°C

junction temperature and the typical load power would be

~53 W which is over 100 lm/W.

dimming including PWM, analog and bi−level dimming.

Intelligent dimming takes full advantage of the instant

turn−on characteristics of LEDs and combines it with

lighting controls to save significant energy without

compromising lighting quality or user safety and comfort.

Some traditional large area light sources are difficult to

easily dim and have long turn−on times to full brightness.

This is not the case with LEDs as they can quickly be turned

on and off and their lifetime improves when dimmed

because the average operating junction temperature is

reduced. PWM and analog dimming are traditional

techniques for dimming. Bi−level or multi−level dimming

uses these techniques and adds sensors or controls (motion,

networked, or timer based) to incorporate two or more

discrete lighting levels. This allows additional energy

savings without compromising safety and convenience.

This is especially useful in outdoor and underground

lighting were bi−level control can reduce the light level

based on time−of−day or activity detection to save power

without compromising safety. In fact the California Lighting

Technology recently published a study where bi−level LED

lighting saved 87% over conventional 70 W HID outdoor

pathway bollards.

This application note also focuses on various options for

EVAL BOARD USER’S MANUAL

http://onsemi.com

Publication Order Number:

Plus that have

EVBUM2039/D

Related parts for NCL30051LEDGEVB

NCL30051LEDGEVB Summary of contents

Page 1

... W nominal application, the controller topology is ideal for power levels to 200 W and higher. This specific design is available as evaluation board NCL30051LEDGEVB. There are a wide variety of medium power lighting applications that would benefit from replacing the traditional light source with an LED source including street lights, refrigerator cases, parking garages, wall washers, wall packs and architectural lighting ...

Page 2

Beyond the power stage design, circuitry is provided for demonstrating three types of dimming control: • Analog dimming with programming signal; • Bi−level dimming with a simple logic level input signal; • PWM dimming using ...

Page 3

C16 Figure 1. Primary Side Schematic http://onsemi.com R17 10K MMSZ5248B 3 ...

Page 4

Power Factor Correction Section The boost power factor corrector circuit is composed of MOSFET Q1, boost diode D6, boost inductor L2, and the components associated with the PFC control section and pins of the NCL30051 control IC U1. D5 provides ...

Page 5

... The current and voltage sensing circuitry is based around the NCS1002 CVCC controller. The specific sensing circuitry is essentially identical to that used in ON Semiconductor application note AND8470 for the NCL30001 LED controller and will only be briefly described here. Current regulation is accomplished by section B of U4. ...

Page 6

Figure 3. Secondary Side Schematic http://onsemi.com 6 ...

Page 7

Resonant Half−Bridge Transformer Design (T1) Since the half−bridge transformer operates in a fixed frequency, symmetrical duty ratio, the design becomes very straightforward. A half−bridge converter switches 1/2 of bulk voltage across the transformer primary due to the capacitive divider network ...

Page 8

Part Description: Resonant Half−bridge Transformer − kHz (Rev 3) Schematic ID: T1 Core Type: PQ20/20, Ferroxcube 3C95 or equivalent material Primary Inductance minimum Leakage Inductance: 90 − 100 uH nominal (resonant half−bridge, leakage inductance is ...

Page 9

... PFC Choke Design (L2) Using the PFC design approach illustrated in ON Semiconductor Application Note AND8123, we can analyze the PFC choke design. Inductor rms current output and 85 Vac input: 0.72 A Inductor peak current out and 85 Vac input: 1.75 A Maximum inductance for reasonable switching frequency: 1200 mH max ...

Page 10

Part Description: PFC Choke − 100 kHz (CRM); Rev. 4 (6/8/10) Schematic ID: L2 Core Type: PQ20/20, Ferroxcube 3C95 or equivalent material Core Gap: Gap for 675 uH +/−25 uH across pins Inductance: 650 − ...

Page 11

Dimming Capabilities To demonstrate the LED dimming capabilities of this circuit, the same DIM control card used in the NCL30001 LED driver circuit described in AND8470 has been used here. Dimming can be accomplished using three methods: pulse width modulation ...

Page 12

Figure 8. Output Current/Voltage Transfer Function versus Line 230 Vac 120 Vac 400 500 600 700 OUTPUT CURRENT (mA) http://onsemi.com 14 800 900 1000 ...

Page 13

Figure 9. Minimum Forward Voltage versus Line and Output Current Efficiency With this topology it is possible to achieve better than 90% efficiency even at modest loads. As illustrated in Figure 10, ...

Page 14

Power Factor and Input Harmonic Content The power factor will remain above 0.90 for the rated load output (1 A) and to minimum V levels for 120 Vac ...

Page 15

Vac 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0. OUTPUT FORWARD VOLTAGE (Vdc) Figure 11. Power Factor versus Forward Voltage (I 1.00 0.95 0.90 0.85 0.80 0.75 0.70 90 115 140 INPUT LINE VOLTAGE (Vac) Figure ...

Page 16

Figure 13. Harmonic Levels (230 Vac input, Full Load) Dimming Effects on Power Factor and V The power factor is also affected by both analog and PWM dimming ...

Page 17

Vac; Analog Dim 0.95 0.90 230 Vac; Analog Dim 0.85 0.80 0.75 0. Dimming Limitations PWM dimming is effective down to less than 5% duty ratio for 120 and 230 Vac within the V graphs of ...

Page 18

Figure 15. Output Current Ripple Load and V Output Current Profile at Turn−on Despite the low control loop bandwidth (approximately 25 Hz), the output current profile during start−up when the ac line is applied is very well ...

Page 19

Peak Neutral 5/18/2010 2:51:02 PM Figure 17. Conducted EMI Spectrum with V Figure 18. Input Line Current under Different Operating Conditions EN 55022; Class A ...

Page 20

... NCL30051 Data Sheet 2. NCS1002 CVCC controller data sheet 3. ON Semiconductor Application Note AND8470 Semiconductor Application Note AND8427 Semiconductor Design Note DN06068/D N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81− ...

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