Fairchild FEB-L041 service manual

User Guide for

FEB-L041

Evaluation Board

6.5W LED Driver

Featured Fairchild Product:

S3217N

FL

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

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 Design ........................................................................................................ 10

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

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

3.2. Operation Waveforms .................................................................................................... 13

3.3. Constant Current Regulation .......................................................................................... 14

3.4. Short-LED / Open LED Protections ............................................................................... 15

3.5. System Efficiency .......................................................................................................... 17

3.6. Power Factor and Total Harmonic Distortion ................................................................ 18

3.7. Operating Temperature .................................................................................................. 19

3.8. Electromagnetic Interference (EMI) .............................................................................. 20

4. Revision History ..................................................................................................................... 21

This user guide supports the evaluation kit for the FLS3217N. It should be used in conjunction with the FLS3217N 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 universal line voltage LED ballast using the FLS3217N Primary-Side Regulator (PSR) single-stage controller. The input voltage range is 90V 24V specification, schematic, bill of materials, and typical operating characteristics.

1.1. General Description

The FLS3217N is an active Power Factor Correction (PFC) controller using single-stage flyback topology. Primary-side regulation and single-stage topology minimize cost, reduce external components and 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 higher efficiency and simple design. FLS3217N provides protections such as open LED, short LED and over temperature.

. This document contains a general description of the FLS3217N, the power supply

MAX

RMS

– 265V

.

and there is one DC output with a constant current of 270mA at

RMS

1.2. Features

 Cost-Effective Solution without input bulk capacitor or feedback circuitry  Power Factor Correction  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  Application Voltage Range: 80V

Over-Voltage Protection

DD

Under-Voltage Lockout (UVLO)

DD

~ 308VAC

AC

1.3. Internal Block Diagram

Figure 1. Internal Block Diagram

2. General 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 Lamp

Description Symbol Value Comments

V

90V Minimum Input Voltage

IN.MIN

V

Input

Voltage

Frequency

Voltage Current

Output

Current

Efficiency

PF/THD

Temperature

FLS3217N T

Rectifier T

V

OUT.NOMINAL

I

OUT.NOMINAL

CC Deviation

Eff

PF/THD

265V Maximum Input Voltage

IN.MAX

IN.NOMINAL

120V / 230V Nominal Input Voltage

fIN 60Hz / 50Hz Line Frequency

V

11V Minimum Output Voltage

OUT.MIN

28V Maximum Output Voltage

OUT.MAX

24V Rated Output Voltage

270mA Rated Output Current

< ±2.78% Line Input Voltage Change: 90~265V

< ±2.60% Output Voltage Change: 11~28V

Eff

90VAC

120VAC

140VAC

180VAC

230VAC

85.35% Efficiency at 265VAC Line Input Voltage

265VAC

90VAC

120VAC

140VAC

180VAC

230VAC

265VAC

54.9ºC Main Controller Temperature

FLS3217N

47.7ºC Secondary Diode Temperature

Rectifier

84.96% Efficiency at 90VAC Line Voltage

86.55% Efficiency at 120VAC Line Input Voltage

86.86% Efficiency at 140VAC Line Input Voltage

86.90% Efficiency at 180VAC Line Input Voltage

86.19% Efficiency at 230VAC Line Input Voltage

0.99 / 12.71% PF/THD at 90VAC Line Input Voltage

0.99 / 10.46% PF/THD at 120VAC Line Input Voltage

0.98 / 11.10% PF/THD at 140VAC Line Input Voltage

0.97 / 14.01% PF/THD at 180VAC Line Input Voltage

0.94 / 16.47% PF/THD at 230VAC Line Input Voltage

0.91 / 18.89% PF/THD at 265VAC Line Input Voltage

AC

2.1. Photographs of Evaluation Board

Figure 2. Top View (Dimensions: 59.9mm (L) x 25.5mm (W) x 15.0mm (H))

Figure 3. Bottom View (Dimensions: 59.9mm (L) x 25.5mm (W) x 15.0mm (H))

2.2. Printed Circuit Board

Figure 4. Top Side

Unit: mm

Figure 5. Bottom Side