Fairchild FEBFL7730 service manual

User Guide for

FEBFL7730_L20H008A

8.4W LED Bulb Using FL7730

Featured Fairchild Product:

FL7730

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 .............................................................................................................. 5

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

4. Printed Circuit Board ................................................................................................................ 7

5. Schematic .................................................................................................................................. 8

2.1 Bill of Materials ............................................................................................................... 9

2.2 Transformer and Winding Specifications ...................................................................... 10

6. Performance of Evaluation Board ........................................................................................... 11

6.1. Startup ............................................................................................................................ 11

6.2. Operation Waveforms .................................................................................................... 11

6.3. Constant Current Regulation .......................................................................................... 12

6.4. Open/Short-LED Protections ......................................................................................... 13

6.5. Dimming Operation ........................................................................................................ 14

6.6. System Efficiency .......................................................................................................... 16

6.7. Power Factor and THD .................................................................................................. 16

6.8. Operating Temperature .................................................................................................. 17

6.9. EMI................................................................................................................................. 18

7. Revision History ..................................................................................................................... 19

This user guide supports the evaluation kit for the FL7730. It should be used in conjunction with the FL7730 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 low-line voltage LED ballast using the FL7730 PSR single-stage controller. The input voltage range is 180V there is one DC output with a constant current of 380mA at 22V contains general description of FL7730, the power supply specification, schematic, bill of materials, and the typical operating characteristics.

1.1. General Description

The FL7730 is an active Power Factor Correction (PFC) controller using single-stage flyback topology. Dimming control with no flicker is implemented by an analog sensing method. Primary-side regulation and single-stage topology reduce external components such as input bulk capacitor and feedback circuitry and minimize cost. To improve good power factor and Total Harmonic Distortion (THD), constant on-time control is utilized with 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 DCM operation with higher efficiency. FL7730 provides protections such as open-LED, short-LED, and over-temperature protection.

– 265V

RMS

. This document

MAX

.

RMS

and

1.2. Features

 Compatible with Traditional TRIAC Control  Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry  Power Factor Correction (PFC)  Accurate Constant-Current (CC) Control  Line Voltage Compensation for CC Control  Linear Frequency Control for Better Efficiency and Simpler Design  Open-LED Protection  Short-LED Protection  Cycle-by-Cycle Current Limiting  Over-Temperature Protection with Auto Restart  Low Startup Current: 20μA  Low Operating Current: 5mA  Frequency Hopping for EMI  V

Under-Voltage Lockout (UVLO)

DD

 Gate Output Maximum Voltage Clamped at 18V  SOP-8 Package Available

1.3. Internal Block Diagram

Figure 1. Internal Block Diagram

2. General Specifications

All data in Table 1 was measured at an ambient temperature of 25°C.

Table 1. Summary of Features and Performance for LED Lighting Bulb

Description Symbol Value Comments

V

IN,MIN

Input Voltage

Input Frequency fIN 60Hz Line Frequency

Output Voltage

Current

Efficiency

PF/THD

Temperature

VIN,

V

IN,NOMINAL

V

OUT,MIN

V

OUT,MAX

V

OUT,NOMINAL

I

OUT,NOMINAL

I

OUT,RIPPLE

CC Deviation

Note: No Dimmer Connected

Eff

180VAC

Eff

220VAC

Eff

230VAC

Eff

265VAC

Note: No Dimmer Connected

PF/THD

Note: Open-Frame Condition (T

T

FL7730

T

MOSFET

T

DIODE

T

TRANSFORMER

T

DAMPER

T

STR.RESISTOR

180V Minimum Input Voltage

265V Maximum Input Voltage

MAX

220~230V Nominal Input Voltage

10V Minimum Output Voltage

28V Maximum Output Voltage

22V Nominal Output Voltage

380mA Nominal Output Current

±65mA Output Current Ripple

<±1.9% Line Input Voltage Change: 180~265V

<±3.1% Output Voltage Change: 10~28V

84.5% Efficiency at 180VAC Line Input Voltage

84.4% Efficiency at 220VAC Line Input Voltage

84.4% Efficiency at 230VAC Line Input Voltage

83.8% Efficiency at 265VAC Line Input Voltage

0.97/13.7% PF/THD at 180VAC Line Input Voltage

180VAC

0.93/16.6% PF/THD at 220VAC Line Input Voltage

220VAC

0.92/17.3% PF/THD at 230VAC Line Input Voltage

230VAC

0.87/19.7% PF/THD at 265VAC Line Input Voltage

265VAC

=25ºC)

A

46ºC FL7730 Temperature

53ºC Primary MOSFET Temperature

45ºC Secondary Diode Temperature

48ºC Transformer Temperature

49ºC Active Damper Temperature

55ºC Startup Resistor Temperature

AC

3. Photographs

Figure 2. Top View of Evaluation Board Figure 3. Bottom View of Evaluation Board

Dimensions: 62.5mm (L)  26.8mm (W)  12.0 (H)

Figure 4. Side View in Bulb Case Type 1 Figure 5. Bottom View in Bulb Case Type 1

Bulb Case Type 1 : 32mm (Case Diameter)  40mm (Case Depth)

Figure 6. Side View in Bulb Case Type 2 Figure 7. Bottom View in Bulb Case Type 2

Bulb Case Type 2 : 34mm (Case Diameter)  44mm (Case Depth)