ISL6745UEVAL2Z Intersil, ISL6745UEVAL2Z Datasheet

ISL6745UEVAL2Z

Manufacturer Part Number

ISL6745UEVAL2Z

Description

EVAL BOARD 2 FOR ISL6745

Manufacturer

Intersil

Datasheets

1.ISL6745AUZ-T.pdf (8 pages)

2.ISL6745LEVAL2Z.pdf (14 pages)

Specifications of ISL6745UEVAL2Z

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Introduction

The ISL6745UEVAL2Z utilizes Intersil’s double-ended

voltage mode PWM controller for a SEPIC converter

application requiring a constant output current. It consists of

separate assemblies for the driver and for the LED board,

which supports as many as 21 high brightness LEDs. The

LED driver board converts a universal (85V to 275VAC) AC

input to a DC output rated at 300mA. The design can be

further optimized for applications that do not require

universal AC input. ISL6745LEVAL2Z is for 80V to 140V

applications.

Worldwide, on average, 19% of the electric power goes for

lighting [11]. In 2000, about 567BKWH of electric energy (or

16% of the nation’s electric energy in the United States) is for

residential, commercial or industrial lighting [22], [3]33. The

commonly used lighting technologies include incandescent

and halogen bulbs, fluorescent and compact fluorescent

lamps (CFL), and high intensity discharge (HID) lamps.

Generally, the efficiency of the lighting sources is indexed by

efficacy, or lumen per watt weighted to the sensitivity of the

human eye. The efficacy of typical energy saving CFL lamps

is around 7%~8%, compared with 2% for the conventional

the incandescent bulbs [4]. With the advancement of new

materials and manufacturing processes, the economics and

performance of high brightness LEDs are now attracting the

attention of academia and industry. For instance, in 2006,

Cree Inc. demonstrated a prototype with a record white LED

luminous efficacy of 131 lm/W [5]. Compared with commonly

used lighting sources, white LEDs provide equivalent or

superior efficacy, and improvements are announced

frequently. Unlike the CFLs, LEDs contains no mercury, and

are less susceptible to breakage. They have a very long

expected life (100,000 hours, more than 10x as much as

CFLs), and high on/off repetition capability. Of particular

interest, they are easy to power when compared to many

traditional sources. The practical application of LED lighting

for commercial and residential applications has become a

reality. The typical operating current of the high brightness

LED is about 300mA~1000mA. The typical drive voltage for

high brightness white LED is about 2.5V to 4V.

The ISL6745UEVAL2Z evaluation board is a reference

design for powering high brightness white LEDs. It utilizes

the ISL6745 voltage mode PWM controller in the

single-ended primary inductance converter (SEPIC)

topology to convert a universal ac input to a variable 300mA

DC output. See Figure 1.

This application note describes the circuit operation design

constraints, description of the evaluation board, and its

performance.

Application Note

ISL6745EVAL2Z Offline High Brightness White LED

Driver With High Power Factor for Universal Input

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Key Features

• Universal AC Input

• Dimmable LED Brightness

• High Power Factor

• Overvoltage Protection

• Overcurrent Protection

• Transformerless

Specifications for ISL6745UEVAL2Z

• Input AC Voltage . . . . . . . . 85V to 275VAC (50Hz~60Hz)

• Outputs DC . . . . . . . . . . . . . . . . . . . . . . . . . Up to 300mA

• Output DC Voltage Ripple . . . . . . . . . . . . . . . . . . . . . . 5%

• Typical Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75%

• Typical Power Factor . . . . . . . . . . . . . . . . . . . . . . . . >0.95

FIGURE 1. TOP VIEW OF DRIVE AND LED BOARDS

All other trademarks mentioned are the property of their respective owners.

June 9, 2009

Intersil (and design) is a registered trademark of Intersil Americas Inc.

AN1411.3

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ISL6745UEVAL2Z Summary of contents

Page 1

... The typical operating current of the high brightness LED is about 300mA~1000mA. The typical drive voltage for high brightness white LED is about 2.5V to 4V. The ISL6745UEVAL2Z evaluation board is a reference design for powering high brightness white LEDs. It utilizes the ISL6745 voltage mode PWM controller in the ...

Page 2

Operation Mechanism and Design Constraints A simplified offline SEPIC converter for LED lighting applications is shown in Figure 3, where the voltage across C is the rectified AC voltage. A current sense resistor is 1 placed in series with the ...

Page 3

TABLE 1. SEPIC CONVERTER (Continued) NAME DESCRIPTION C Feedback Capacitor F I Brightness Dimming Control ADJ CS The MOSFET Current D Output Diode 5 There are three stages of operations: 1. The switch turns on, Diode is off. 2. The ...

Page 4

If we define the ripple factor Krpi = Irp/Il, where Il is the peak of the input current, then the constraint for DCM operation of the converter is as expressed in Equation 15 η ...

Page 5

Waveforms (Continued) VINPUT VINPUT FIGURE 6. INPUT VOLTAGE AND CURRENT, VAC = 240V 300mA O FIGURE 8. OUTPUT VOLTAGE AND RIPPLE Io = 300mA 5 Application Note 1411 FIGURE 7. OUTPUT VOLTAGE AND RIPPLE I FIGURE 9. OUTPUT ...

Page 6

... FIGURE 11. THE GATE SIGNAL AND DRAIN-SOURCE VOLTAGES erformance P of ISL6745UEVAL2Z The schematic of the ISL6745UEVAL2Z evaluation board is shown in page 12. The bill of material (BOM) for universal AC application is shown on page 8. Figure 1 on page 1 shows photographs of the drive board and LED board. The configuration of the test bench is shown in Figure 12. ...

Page 7

Figure 10 is the drain-source voltage of the switch. In Figure 11, the D-S voltages of the MOSFET are shown with the corresponding gate signal at input peak and valley, respectively. Three distinct modes of operation can be observed. 1. ...

Page 8

... Bill of Materials for ISL6745UEVAL2Z MANUFACTURER PART NUMBER Panasonic ECQU2A224ML Murata GRM31BR72J472KW01L Placeholder Murata GRM43QR72J683KW01L Nippon Chem TDK C3216COG2J221J Murata Murata Murata GRM188R71H221KA01D Murata GRM32ER61C476ME15L Murata GRM188R71H331KA01D Murata GRM31CR72A105KA01L Murata GRM188R71H221KA01D Murata GRM188R71H221KA01D Diodes, Inc 1N4007 Diodes, Inc BYG24J OnSemi MMSD4148 LittelFuse ...

Page 9

... Bill of Materials for ISL6745UEVAL2Z MANUFACTURER PART NUMBER DNP Test point, DNP Intersil ISL6745AUZ Intersil EL5220 Diodes, Inc AP432-SR Philips BZX84-C11 LittelFuse TMOV14R260E Bill of Materials for ISL6745LEVAL2Z PART MANUFACTURER NUMBER TBD ISL6745EVAL2ZREVAPCB TDK C3216C0G2J221J-T PANASONIC ECQ-U2A224ML MURATA GRM31BR72J472KW01L MURATA GRM43QR72J683KW01L MURATA H1045-00221-50V10-T ...

Page 10

... VENKEL H2513-00100-1/4W1-T VENKEL H2513-01004-1/4W1-T VENKEL H2513-04992-1/4W1-T VISHAY H2515-00100-1W1-T DALE H2515-00R10-1W1-T VENKEL H2515-01000-1W1-T VENKEL H2515-02551-1W1-T VENKEL H2515-07R15-1W1-T BUSSWIRE-18AWG 3M SJ-5003-BLACK INTERSIL COMMON 8x12-STATIC-BAG STOCK DNP DNP DNP DNP DNP 10 Application Note 1411 (Continued) REFERENCE QTY DESIGNATOR 1 VR1 DIODE-ZENER, SMD, SOT23,10.4V to 11.6V, 5%, 200mA, ROHS 1 ...

Page 11

Bill of Materials for ISL6745LEVAL2Z PART MANUFACTURER NUMBER LABEL-RENAME BOARD LABEL-SERIAL NUMBER LITTLEFUSE INC TMOV14RP140E 11 Application Note 1411 (Continued) REFERENCE QTY DESIGNATOR 1 RENAME PCB TO: LABEL, TO RENAME BRD ISL6745LEVAL2Z. 1 LABEL, FOR SERIAL NUMBER AND BOM REV ...

Page 12

ISL6245UEVAL2Z Schematic FUSE TR5 0. C14 CON2 TP1 TP1 49. R15 49.9k C2 C17 ...

Page 13

ISL6745EVAL2Z Layout 13 Application Note 1411 FIGURE 16. TOP SILKSCREEN FIGURE 17. BOTTOM SILKSCREEN AN1411.3 June 9, 2009 ...

Page 14

... Proceedings of IEEE-IAS Annual Meeting, 1994, pp. 1084–1089. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. ...

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