Samsung S3F84A5 Montage- und Bedienungsanleitung

APPLICATION NOTE

S3F84A5

An LED Lighting System

January 2010

Revision 0.00

Confidential Proprietary of Samsung Electronics Co., Ltd

Important Notice

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or incidental damages.

"Typical" parameters can and do vary in different

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S3F84A5 An LED Lighting System

Application Note, Revision 0.00

any form or by any means, electric or mechanical, by photocopying, recording, or otherwise, without the prior

written consent of Samsung Electronics.

Samsung Electronics Co., Ltd.

San #24 Nongseo-Dong, Giheung-Gu

Yongin-City, Gyeonggi-Do, Korea 446-711

TEL : (82)-(031)-209-4356

FAX : (82)-(031)-209-3262

Home Page: http://www.samsungsemi.com

Printed in the Republic of Korea

Revision History

Revision No. Date Description Author(s)

0 Jan. 20, 2010 - Initial draft Wei Ningning

Table of Contents

1 Overview of HPLED Lighting Control System............................................7

1.1 Pin Assignment in S3F84P4........................................................................................................................7

1.2 Key Features of S3F84P4............................................................................................................................8

1.3 System Principle ..........................................................................................................................................8

1.3.1 Buck Circuit...........................................................................................................................................9

1.3.2 Summary ..............................................................................................................................................9

1.3.3 Constant Current Control....................................................................................................................10

2 Hardware Implementation ..........................................................................11

2.1 System Diagram and Circuit......................................................................................................................11

2.2 Components Selection...............................................................................................................................12

2.2.1 Select the Inductance (L1) for the Requirement of Current Ripple....................................................12

2.2.2 Select the Capacitance (C2) for the Requirement of Voltage Ripple.................................................12

3 Software Implementation............................................................................13

4 System Validation .......................................................................................15

5 Appendix......................................................................................................17

5.1 BOM List of Key Circuit..............................................................................................................................17

5.2 Appendix 2: Source Code..........................................................................................................................17

List of Figures

Figure Title Page

Number Number

Figure 1-1 S3F84P4 Pin Assignment.....................................................................................................................7

Figure 1-2 Simplified Buck Circuit..........................................................................................................................9

Figure 1-3 Current on load.....................................................................................................................................9

Figure 1-4 HKP-D1W1 Forward Voltage, Forward Current, and Relative Luminous Flux...................................10

Figure 2-1 Control Circuit.....................................................................................................................................11

Figure 3-1 Software Implementation Diagram .....................................................................................................13

Figure 3-2 Way to change PWM duty cycle.........................................................................................................14

Figure 4-1 Waveform for HPLED forward voltage and current............................................................................15

List of Tables

Table Title Page

Number Number

Table 4-1 System validation of efficiency.............................................................................................................16

Table 5-1 BOM list of Key Circuit.........................................................................................................................17

S3F84P4_AN_REV0.00 (PRELIMINARY SPEC) 1 OVERVIEW OF HPLED LIGHTING CONTROL SYSTEM

1 OVERVIEW OF HPLED LIGHTING CONTROL

SYSTEM

A light-emitting diode (LED) is a semiconductor light source that presents several advantages over traditional light

(like incandescent) sources such as lower energy consumption, longer lifetime, improved robustness, smaller size,

faster switching, and greater durability and reliance. It renders “green” light and does not contribute towards

material pollution or radiations. Usually, an LED can also be referred to as HPLED (high power LED) if the NRP

(normal rated power) is greater than 1W. It can be driven at currents that vary from hundreds of mA to more than

an ampere. LEDs can produce hundreds of lumens, and find extensive usage in lighting systems.

This document presents a simple HPLED lighting control system implemented with Samsung’s 8-bit MCU

S3F84P4.

1.1 PIN ASSIGNMENT IN S3F84P4

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Figure 1-1 shows the pin assignment in S3F84P4.

Figure 1-1 S3F84P4 Pin Assignment

S3F84P4_AN_REV0.00 (PRELIMINARY SPEC) 1 OVERVIEW OF HPLED LIGHTING CONTROL SYSTEM

1.2 KEY FEATURES OF S3F84P4

The key features in S3F84P4 include:

4 kbyte Flash ROM or 208 Byte SRAM

6+6 PWM x 1

10-bit ADC x 4

8-bit Basic Timer (can be used as watchdog timer)

16-bit Timer0 (can be used as Timer A or B, the two 8-bit Timers )

EXINT X 2

Supports Configurable LVR (2.2/ 3.0/ 3.9V)

Supports Configurable RC (1M/ 8MHz @5V)

Supports six IOs (maximum) when using internal LVR and internal RC

1.3 SYSTEM PRINCIPLE

The two considerations for HPLED are:

1. Forward voltage

2. Constant control current

Different LED applications have different characteristics. For instance, LEDs come in different colors. In some

cases, manufacturers of the LED applications might also differ. Even if the LED applications come from the same

manufacturer, it can lead to differences in forward voltage. In such cases, constant voltage power cannot work.

Different LED applications should select different power suppliers according to its characteristics. For instance, by

considering efficiency, switch module power supplier (SMPS) can be chosen for different LED applications. SMPS

consists of Buck, Boost, or Buck-Boost circuits.



The duty cycle of Buck circuit is . It is only used when the power supply is higher than the forward

voltage, that is, .

VV





The duty cycle of Boost circuit is . It is only used when the forward voltage is higher than the power

supply, that is, .

VV

DVV





The duty cycle of Buck-Boost circuit is . It can be used without considering the relationship of power

supply and forward voltage.

In this application, buck circuit is chosen to power a HKP-D1W1 white LED (forward voltage 3.5V) with a DC

power source of 5V.

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S3F84P4_AN_REV0.00 (PRELIMINARY SPEC) 1 OVERVIEW OF HPLED LIGHTING CONTROL SYSTEM

1.3.1 BUCK CIRCUIT

Figure 1-2 Simplified Buck Circuit

Buck circuit works when a switch signal turns on the transistor (Q). The DC power then starts to charge the coil

(L). When the current reaches a predefined level, change the transistor state from On to Off using the switch

signal. At this time, since the coil will have inertia to keep the current direction, the load still can be powered with a

freewheeling diode until the switch signal turns on the transistor again. The resulting current is continuous but

alternating (see

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Figure 1-3 for more details).

Figure 1-3 Current on load

1.3.2 SUMMARY

The average current over load is determined by the duty cycle of switch signal.

SMPS can lead to current ripple. But it could be alleviated by increasing the PWM frequency or coil

inductance value, or by adding extra filtering circuits.

S3F84P4_AN_REV0.00 (PRELIMINARY SPEC) 1 OVERVIEW OF HPLED LIGHTING CONTROL SYSTEM

1.3.3 CONSTANT CURRENT CONTROL

Refer to the HKP-D1W1 datasheet to see the relationship of forward voltage, forward current, and relative

luminous flux.

Figure 1-4 HKP-D1W1 Forward Voltage, Forward Current, and Relative Luminous Flux

As shown in Figure 1-4, describing the luminous flux as a function of current is better than describing it as a

function of voltage. Even a slight change of voltage might lead to significant current shift. Therefore, constant

current control is used in HPLED applications.

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