Fairchild FEB-L034 service manual

User Guide for

FEB-L034

Evaluation Board

Universal Line Voltage LED Ballast

Featured Fairchild Product:

FL7701

Direct questions or comments

about this evaluation board to:

“Worldwide Direct Support”

Fairchild Semiconductor.com

Table of Contents

1. Introduction ............................................................................................................................... 3

1.1. General Description ......................................................................................................... 3

1.2. Features ............................................................................................................................ 3

1.3. Internal Block Diagram .................................................................................................... 4

2. General Specifications for Evaluation Board ........................................................................... 5

3. Photographs............................................................................................................................... 6

4. Printed Circuit Board ................................................................................................................ 6

5. Schematic .................................................................................................................................. 7

6. Bill of Materials ........................................................................................................................ 8

7. Performance of Evaluation Board ............................................................................................. 9

7.1. Typical Waveforms: Startup .......................................................................................... 10

7.2. Operating Frequency & Minimum Duty ........................................................................ 11

7.3. Typical Waveforms: Steady State .................................................................................. 12

7.4. Typical Waveforms: Abnormal Mode (LED-Open) ...................................................... 15

7.5. Typical Waveforms: Abnormal Mode (Inductor Short) ................................................ 16

7.6. System Efficiency .......................................................................................................... 17

7.7. Power Factor at Rated Load Condition .......................................................................... 18

7.8. THD Performance at Rated Load Condition ................................................................. 19

7.9. Thermal Performance at Rated Load Condition ............................................................ 20

7.10. Electromagnetic Interference (EMI) Result ................................................................... 22

8. Revision History ..................................................................................................................... 24

This user guide supports the evaluation kit for the FL7701. It should be used in conjunction with the FL7701 datasheets as well as Fairchild’s application notes and technical support team. Please visit Fairchild’s website at www.fairchildsemi.com.

1. Introduction

This document describes the proposed solution for an universal input 18.3W LED ballast using the FL7701. The input voltage range is 90V output with a constant current of 470mA at 39V description of FL7701, the power supply specification, schematic, bill of materials, and the typical operating characteristics.

1.1. General Description

The FL7701 LED lamp driver is a simple IC with a Power Factor Correction (PFC) function. The special “adopted digital” technique of the IC can automatically detect input voltage condition Zero-Crossing Detector (ZCD) and send a internal reference signal for high power factor. When AC input is applied to the IC, PFC function is automatically enabled. When DC input is applied to the IC, PFC function is automatically disabled. The FL7701 does not need a bulk capacitor (electrolytic capacitor) for supply rails stability, which can significantly affect to LED lamp system.

– 264V

RMS

. This document contains general

MAX

and there is one DC

RMS

1.2. Features

 Digitally Implemented Active PFC Function

(No Additional Circuit Necessary for High PF)

 Built-in HV Supplying Circuit: Self Biasing  AOCP Function with Auto-Restart Mode  Built-in Over-Temperature Protection (OTP)  Cycle-by-Cycle Current Limit  Low Operating Current: 0.85mA (Typical)  Under-Voltage Lockout with 5V Hysteresis  Programmable Oscillation Frequency  Programmable LED Current  Analog Dimming Function  Soft-Start Function  Precise Internal Reference: ±3%

1.3. Internal Block Diagram

HV

VCC

3

VCC

ZCD

time

I

AD

ZCD

UVLO

JFET

8

ADIM

RT

GND

5

Oscillator

4

6

DAC

Soft-Start

Digital Block

Reference

TSD

+

LEB

Leading-Edge

Blanking

Q

R

S

AOCP

+

2.5V

OUT

2

1

CS

Figure 1. Block Diagram

Table 1. Pin Definitions

Pin Name Description

1 CS 2 OUT 3 VCC

4 RT

5 ADIM

6 GND 7 NC No Connection 8 HV

Current Sense. Limits output current, depending on the sensing resistor voltage. The CS pin is also used to set the LED current regulation.

Output. Connects to the MOSFET gate. Supply Voltage. Supply pin for stable IC operation; ZCD signal detection

used for accurate PFC function. Resistor. Programmable operating frequency using an external resistor

connected to this PIN and the IC has fixed frequency when this pin is left open or floating.

Analog Dimming. Connects to the internal current source and can change the output current using an external resistor. If ADIM is not used, connect a

0.1µF bypass capacitor between ADIM and GND.

GROUND. Ground for the IC.

High Voltage. Connect to the high-voltage line and supply current to the IC

2. General Specifications for Evaluation Board

All data for this table was measured at an ambient temperature of 25°C.

Table 2. Summary of Features and Performance

Description Symbol Value Comments

V

90V Minimum Input Voltage

IN.MIN

Input Voltage Range

AC Input Frequency

Output Voltage

Output Current

Output Power

(1)

(2)

Efficiency

Temperature

Initial Application

Notes:

1. The output current has I in parallel with the LED. Ensure the capacitor voltage rating is high enough to withstand an open-LED condition or use a Zener diode for protection.

2. The output power is not equal to the apparent power due to the slight phase shift between the output voltage and current.

V

IN.NORMAL

V

f

V

OUT,MAX

V

OUT,NORMAL

V

I

OUT.NORMAL

CC deviation < ±4.5%

110V / 220V Normal Input Voltage

264V Maximum Input voltage

IN.MAX

47Hz Minimum Input Frequency

IN.MIN

64Hz Maximum Input Frequency

IN.MAX

41V Maximum Output Voltage

39V Normal Output Voltage

37V Minimum Output Voltage

OUT,MIN

470mA Normal Output Current

Line Input Voltage Change:

Output Power 18.3W

>83% At Full Load

T

< 63°C

FL7701

T

< 69°C

DM filter

T

FRD,ES3J

T

MOSFET

T

inductor

PCB Size

ripple. To reduce ripple current, use a large electrolytic capacitor

LEDPK

< 61°C

< 68°C

< 50°C

At full load (all at open-frame,

room temperature / still air)

18mm (width) x 295mm (length) x

90~264VAC

10mm (height)

L-Tube

3. Photographs

Figure 3. Width: 18mm Figure 4. Height: 10mm (Include PCB)

Figure 2. Top View, Length: 295mm

4. Printed Circuit Board

Figure 5. Top Side (18mm x 295mm)

Figure 6. Bottom Side (18mm x 295mm)

5. Schematic

Figure 7. Schematic

6. Bill of Materials

Item

No.

1 U1 FL7701 1 Controller Fairchild Semiconductor 2 Fuse SS-5-1A 1 1A/250V Fuse Cooper Bussmann 3 MOV MOV-10D471K 1 VARISTOR 470V 10MM RADIAL Bourns Inc.

4 L1 LF-1480-253 1 Line Filter 5 L2, L3 RFB0810-472 2 4.7mH Inductor Coil Craft

6 L4, L5 PCH-45x-475 2 4.7mH Inductor Coil Craft 7 BD DF04S 1 400V / 1.5A, Bridge Rectifier Fairchild Semiconductor

8 D1 1N4148 1

9 D2 RS1M 1 1000V / 1A, Fast Rectifier F airchild Semiconductor 10 D3 ES3J 1 600V / 3A, Fast Rectifier Fairchild Semiconductor 11 ZD1 MMSZ5230B 1 4.7V / 0.5W Zener Diode Fairchild Semiconductor 12 Q1 FQD2N60 1 2A / 600V MOSFET Fairchil d Semiconductor 13 Q2 FQN1N50C 1 1A / 500V MOSFET Fairchild Semiconductor

14 C1

15 C2 MPE 630V104K 1

16 C3 MPE 400V334K 1

Part

Reference

Part Number Qty. Description Manufacturer

Sejin Telecom

(www.sejintel.com)

PCX2 335M MKP

100nF

100V / 200mA, Small Signal

Diode

1 100nF / 275VAC, X-Cap PILKOR

0.1µF / 630VAC, 10%, Polypropylene

0.33µF / 400VAC, 10%, Polypropylene

Fairchild Semiconductor

Sungho

17 C4, C5 C1206C225K5PACTU 2 18 C6 19 C7 C1206C102K5PACTU 1 20 C8 C1206C105K5PACTU 1

21 C9 KMG 330µF / 63V 1 330µF/63V Electrolytic Capacitor SamYoung 22 R1, R2 RC1106JR-07151RL 2 23 R3 RC0805JR-07331RL 1 24 R4, R5 RC1106JR-070R9RL 2 25 R6 RC1106JR-07204RL 1 26 R7 RC1106JR-07153RL 1 27 R8 RC0805JR-07823RL 1 28 R9 10.0KBZTB-ND 1 29 R10 RC1106JR-07000RL 1

C0805C104K3RACTU

2.2µF / 50V SMD Capacitor 3216

1

0.1µF / 25V SMD Capacitor 2012

1nF / 50V SMD Capacitor 3216

1µF / 50V SMD Capacitor 3216

150Ω RES, SMD, 1/4W, 3216 330Ω RES, SMD, 1/8W, 2012

0.9Ω RES, SMD, 1/4W, 3216

200kΩ RES, SMD, 1/4W, 3216

15kΩ RES, SMD, 1/4W, 3216 82kΩ RES, SMD, 1/8W, 2012

10kΩ / 1W Resistor

0Ω RES, SMD, 1/4W, 3216

Kemet Kemet Kemet Kemet

Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo

Fairchild FEB-L034 service manual

Specifications and Main Features

Frequently Asked Questions

User Manual