Fairchild FEB-L040 service manual

User Guide for

FEB_L040

Evaluation Board

Universal Input 3.5W LED Ballast Controller

Featured Fairchild Product: FLS3217M

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. Specifications for Evaluation Board ......................................................................................... 5

2.1. Photographs of Evaluation Board ...................................................................................... 6

2.2. Printed Circuit Board ......................................................................................................... 7

2.3. Schematic .......................................................................................................................... 8

2.4. Bill of Materials ................................................................................................................. 9

2.5. Transformer and Winding Specifications ........................................................................ 10

3. Performance of Evaluation Board ........................................................................................... 11

3.1. Startup Time .................................................................................................................... 12

3.2. Output Ripple & Noise .................................................................................................... 13

3.3. Short-LED Protection ...................................................................................................... 14

3.4. Open-LED Protection ...................................................................................................... 15

3.5. Constant Current Regulation ........................................................................................... 16

3.6. Efficiency ........................................................................................................................ 17

3.7. Power Factor & Total Harmonic Distortion .................................................................... 18

3.8. Temperature ..................................................................................................................... 19

3.1. Electromagnetic Interference (EMI) ............................................................................... 20

4. Revision History ..................................................................................................................... 22

This user guide supports the evaluation kit for the FLS3217M. It should be used in conjunction with the FLS3217M datasheet 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 a universal line voltage LED ballast using the FLS3217M buckboost controller. The input voltage range is 90V and there is one DC output with a constant current of 100mA at 35V contains a general description of the FLS3217M, the power supply specification, schematic, bill of materials, and typical operating characteristics.

1.1. General Description

The FLS3217M is an active Power Factor Correction (PFC) controller using single-stage flyback topology. Primary-side regulation and single-stage topology minimize cost and reduce external components, such as input bulk capacitor and feedback circuitry. To improve power factor and THD, constant on-time control is utilized with an internal error amplifier and a low-bandwidth compensator. Precise constant-current control regulates accurate output current, independent of input voltage and output voltage. Operating frequency is proportionally changed by output voltage to guarantee Discontinuous Conduction Mode (DCM) operation with high efficiency and simple design. FLS3217M provides open-LED, short-LED, and over temperature protections.

– 265V

RMS

. This document

MAX

.

RMS

1.2. Features

 Cost-Effective Solution without Input Bulk Capacitor or Feedback Circuitry  Power Factor Correction (PFC)  Integrated Power MOSFET  Accurate Constant-Current (CC) Control: Independent Online Voltage, Output

Voltage, and Magnetizing Inductance Variation

 Linear Frequency Control for Better Efficiency and Simple Design  Open- / Short-LED Protection  Cycle-by-Cycle Current Limiting  Over-Temperature Protection with Auto Restart  Low Startup Current: 20μA  Low Operating Current: 5mA  V  V

Over-Voltage Protection

DD

Under-Voltage Lockout (UVLO)

DD

1.3. Internal Block Diagram

Figure 1. Block Diagram

2. Specifications for Evaluation Board

All data of the evaluation board was measured with the board enclosed in a case and external temperature around 25°C.

Table 1. Evaluation Board Specifications for LED Lighting Bulb

Description Symbol Value Comments

V

90V Minimum Input Voltage

IN.MIN

V

Input

Output

Efficiency

PF/THD

Temperature

Voltage

Frequency

Voltage

Current

FLS3217M

Startup

Resistor

Freewheeling

Rectifier

V

OUT.NOMINAL

I

OUT.NOMINAL

CC Deviation

Eff

PF / THD

T

265V Maximum Input Voltage

IN.MAX

IN.NOMINAL

110V / 220V Nominal Input Voltage

fIN 60Hz / 50Hz Line Frequency

V

20V Minimum Output Voltage

OUT.MIN

38V Maximum Output Voltage

OUT.MAX

35V Nominal Output Voltage

100mA Nominal Output Current

< ±2.17% Line Input Voltage Change: 90~265V

< ±2.22% Output Voltage Change: 19.5~36.3V

Eff

90VAC

120VAC

140VAC

180VAC

220VAC

83.81% Efficiency at 265VAC Line Input Voltage

265VAC

90VAC

120VAC

140VAC

180VAC

220VAC

265VAC

55.6ºC

FLS3217M

T

55.3ºC Primary MOSFET Temperature

START

T

47.4ºC Secondary Diode Temperature

DIODE

84.16% Efficiency at 90VAC Line Input Voltage

86.62% Efficiency at 120VAC Line Input Voltage

87.06% Efficiency at 140VAC Line Input Voltage

87.42% Efficiency at 180VAC Line Input Voltage

86.19% Efficiency at 220VAC Line Input Voltage

0.997 / 21.03% PF / THD at 90VAC Line Input Voltage

0.990 / 23.81% PF / THD at 120VAC Line Input Voltage

0.986 / 24.85% PF / THD at 140VAC Line Input Voltage

0.973 / 25.74% PF / THD at 180VAC Line Input Voltage

0.934 / 28.05% PF / THD at 220VAC Line Input Voltage

0.918 / 29.78% PF / THD at 265VAC Line Input Voltage

(T

Open-Frame Condition

= 25ºC) FLS3217M Temperature

A

AC

Transformer

T

TRANSFORMER

51.3ºC Transformer Temperature

2.1. Photographs of Evaluation Board

Figure 2. Top View

Figure 3. Bottom View

2.2. Printed Circuit Board

Figure 4. Top Side

Figure 5. Bottom Side