100W Commercial LED Light with Wireless
Contents
1. AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 13 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 4 4 4 5 14 Figure 4 5 RF with PA Function Circuit Antenna B C1 RFP H ATmega256RFR2 c2 c3 RFN Table 4 6 Power Amplifier Connection Pin on ATmega256RFR2 Power amplifier PGO PG1 ANT_SET Trickle Charge Timekeep In this reference design use the DS1302 trickle charge timekeeping chip to wake up the Atmel ATmega256RFR2 when it is under the sleeping by time It provides seconds minutes hours days date month and year information to ATmega256RFR2 The DS1302 has dual power for primary and back up power supplies The battery is used to back up power and it can be charged by primary power while the kit is working DS1302 communicates with the ATmega256RFR2 via a simple serial interface Table 4 7 Simple Serial Interface Connection Pin on DS1302 Pin on AVR ATmega256RFR2 DataFlash The Serial Peripheral Interface SPI sequential access flash memory Atmel AT45DB0810D is optional for user to storing any application data needed Table 4 8 Serial Peripheral Interface Connection Pin on AVR ATmega256RFR2 Simple serial interface AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection2. 2 2 3 2 4 6 Programming Firmware The Atmel ATmega256RFR2 and ATxmega8E5 on the kit are programmed with the default firmware The detailed description of the firmware is available in the Atmel AT06700 LED Commercial Light Kit and Gateway Software User Manual Power Supply The kit is powered by AC line under the voltage range 85V to 264V with 50 60Hz frequency The AC to DC switching power supply can deliver 40V 3 5A 12V 100mA and 6V 20mA The 40V supplies to LED strings The 12V and 6V supply power to LED driver circuit The 12V is also regulated down to 3 3V by an onboard DC DC regulator which provides power to the MCUs on MCU Control Board and LED Drive Board Note In this application the ATxmega8E5 devices are running under 32MHz according to the datasheet of the ATxmega8E5 the Vcc of ATxmega8E5 needs greater than 2 7V Programming the Kit The ATmega256RFR2 on the kit can be programmed by programming tools through the JTAG interface The ATxmega8E5 on the kit can be programmed through the PDI interface AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 3 Connectors The 100W Commercial LED Light with Wireless Connection kit has several connectors and headers which dedicate for difference purpose shown in Table 3 1 Table 3 1 Connector and Functions Connecto
3. Board LED Drive Board 4 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Figure 2 3 shows the available features on the Power Supply board Figure 2 3 Overview of the Power Supply Board of the Kit EMI Fliter Main Power Supply j p fret gt Nii Wa its ANN li ez 2 i 2 Relay Standby Power Supply AC Input Power Supply Board 2 1 Components for Setup The components in Table 2 1 are necessary to perform all functions of the kit Table 2 1 Components for Kit Setup Component Function Kit The kit assembled with Power Supply Board MCU Control Board and LED Driver Board AC Power line Supply 110V 220VAC and 50 60Hz frequency power to the kit Four LED Strings As a load for kit If 1A 28VsVfs38V If 1A ZLL Ethernet Gateway Communicate the kit and Wi Fi Router Wi Fi Router Communicate the Tablet or Smartphone and ZLL Ethernet Gateway Personal Computer Control the kit using Personal Computer software Programming Tool with JTAG and PDI interface Debug and Programming Application Software Running on the Personal Computer to control the kit AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 5 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 2
4. HW User Guide ApplicationNote_052014 4 6 4 7 4 8 Pin on AVR ATmega256RFR2 Simple serial interface Function Button not mounted The design is equipped with one function button for user Table 4 9 Function Button Connection Pin on AVR ATmega256RFR2 Function Button RE INT_BUTTON LED Indicator not mounted The design is equipped with one dual LED Red and Green available on the board that can be used to indicate the working condition of the kit The green LED and the red LED can be individually activated by driving the connected I O line to Vcc The dual LED can also emit orange light when both red and green LEDs are activated Table 4 10 LED Connection Pin on AVR ATxmega32E5 LED Red LED Temperature Sensor not mounted The design is equipped with one temperature sensor NCP18WF104FR The power is supplied by Vcc 3 3V The ADC reference is 1 6V R1 is series with the NTC to ensure the input voltage does not exceed the ADC input range The NTC sense voltage could be got from the following equation Vsense VecXRTH1 R1 RTH1 For MCU the equation for the ADC decimal code is ADC Code 4095 x Vsense 1 6 Figure 4 6 Temperature Sensor Circuit Vcc Vsense C1 RTH1 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 15 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Table 4 11 NTC Ta
5. LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 9 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 4 Peripherals Figure 4 1 shows the system block diagram of the 100W Commercial LED Light with Wireless Connection kit Figure 4 1 100W Commercial LED Light with Wireless Connection System Block Diagram llel Powersupply 40VDC yy Four paralle DC DC BUCK Circuit AC Line i L T E E L L VF Va Vs E VA Relay pare Circuit V V V V an t Y en 6 T 3 3voc R m iie baa ntenna i Controller N 2 Ri ed N y ATxmega8E G G G 5 MCU TWI bd ATmega256RFR2 LED Power Controller Amplifier ATxmega8E 5 Time Manual Light dimming dimming dimming Aa WARNING The kit has high voltages on the board that can pose a shock hazard to the user Appropriate care should be taken when operating the board In addition to the high power LED strings are used to LED Load Do not look directly at the LED strings when the kit is active and or protect your eyes with dark glasses since the LED strings are very bright To turn on the kit simply plug the power cord into an AC socket which applies the 85V to 264V and 50 60Hz frequency power source The LED strings will light up while the kit is powered 4 1 AC to DC Switching Power Supply In the system there a
6. interface can be found in Table 3 4 Table 3 4 AVR ATxmega8E5 Programming and Debugging Interface PDI Pin on programming header Connector between the Power Supply Board and LED Driver Board The female connector J704 is lie on the Power Supply Board The male J705 is lie on the LED Driver Board The Power Supply Board provides the power to the LED Driver Board via the connector pair Table 3 5 Connector between Power Supply Board and LED Driver Board Pin on J704 Pin on J705 Name on the connector AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Pin on J704 Pin on J705 Name on the connector 11 40VDC C E 3 4 Connector between the LED Driver Board and MCU Board The male connector J712 is lie on the MCU Board The J706 on the LED Drive Board needs to assemble any connector into it The J712 connector plugs into J706 to achieve connect between the LED Driver Board and MCU Board Table 3 6 Connector between LED Driver Board and MCU Board Pin on J706 Pin on J712 Name on the connector 3 5 LED Strings Connector The CN401 CN402 CN501 and CN502 are LED strings connectors These connectors are polarity sensitive Table 3 7 LED Strings Connector Pin on LED Strings Connector Name on LED Strings Connector LED String AT03201 100W Commercial
7. D Light with Wireless Connection Hardware User Guide APPLICATION NOTE 17 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Table 4 14 Temperature Sensor Connection Pin on AVR ATxmega256RFR2 Light sensor PFO LIGHT_SENSE 4 9 LED String Power Control In order to reduce the power consumption when turn off the LED Strings the main switching power supply should be turn off Table 4 15 LED String Power Control Connection Pin on AVR ATxmega256RFR2 LED String Power Control PE7 LED_POWER_CT 18 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 5 Code Examples The example application is based on the Atmel Software Framework that is included in Atmel Studio 6 The Atmel Software Framework can also be found as a separate package online at http Awww atmel com tools avrsoftwareframework aspx For more information about the code example see the application note Atmel AT06700 LED Commercial Light Kit and Gateway Software User Manual AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 19 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 6 Revision History Doc Rev Date Comments 42302A 05 2014 Initial document rel
8. L OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and products descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life SAFETY CRITICAL MILITARY AND AUTOMOTIVE APPLICATIONS DISCLAIMER Atmel products are not designed for and will not be used in connection with any applications where the failure of such products would reasonably be expected to result in significant personal injury or death Safety Critical Applications without an Atmel officer s specific written consent Safety Critical Applications include without limitation life support devices and systems equipment or systems for the operation of nuclear facilities and weapons systems Atmel products are not designed nor intended for use in military or aerospace applications or environments unless speci
9. S Atmel APPLICATION NOTE AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide Atmel AVR XMEGA Description The reference design kit of 100W Commercial LED Light with Wireless Connection is developed to demonstrate Lightweight Mesh LwMesh protocol function based on the Atmel AVR ATmega256RFR2 The hardware includes three parts AC to DC power supply Atmel single chip RF MCU Control board and LED drive circuit based on Atmel AVR ATxmega8E5 The LED string is controlled by PC software via the Lightweight Mesh protocol commands through the ATmega256RFR2 The kit supports to LED on off and tunable brightness For this reference design the hardware design files schematic BOM and PCB Gerber and software source code can be downloaded from Atmel website The provided hardware documentation can be used with no limitations to manufacture the reference hardware solution for the design Features e Atmel AVR ATmega256RFR2 Microcontroller with 2 4GHz radio transceiver e Atmel AVR ATxmega8E5 Microcontroller e Drives four high power LED strings e Up to 750mA current for each LED string with individual PWM e Wide PWM dimming range with 16 bit solution e Open and short LED string protection e Replaceable LED strings e 140W AC to DC power supply e Time dependent control for LED string e One button for user e One dual LED for user e Program Debug interface JTAG PDI Atmel 42302A 100W Commercial LED Lig
10. ble Part number NCP18WF104F Resistance 100kQ 1 B constant 4200k Temperature C Resistance k0 Temperature C Resistance kQ Oo w O o o O s O o o e E e O s mw s w y O s ww o za OoOo s am w o _ D S a E 463 104 ee ee ee ee ee O s ww o m Oo w ow o s O o y Table 4 12 Temperature Sensor Connection Pin on AVR ATxmega256RFR2 Temperature sensor PF1 NTC_SENSE The design is equipped with one light sensor TEMT6000 Thermostat can enable or disable the backlight based on the ambient light strength The ADC reference is internal 1 6V The sense voltage can be found from the following equation Vsense lca x 10 x R1 lca is Collector Light Current 16 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Figure 4 7 Light Sensor Circuit Vcc N TEMT6000 C1 R1 Figure 4 8 The Curve of Collector Light Current vs Ambient Illuminance 1000 oo ee ee ee Na CH PE NN ca Collector Light Current p A S 10 100 1000 Table 4 13 The Sense Voltage vs Illuminance IIluminance Current VseENSE IIluminance Current VsENSE IIluminance Current are Ix HA V ix HA V ix HA ons e owes ores ss o oo omo Cas om moo AT03201 100W Commercial LE
11. ease 20 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Atmel Enabling Unlimited Possibilities gJ 7 Atmel Corporation 1600 Technology Drive San Jose CA 95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2014 Atmel Corporation Rev Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Atmel Atmel logo and combinations thereof AVR Enabling Unlimited Possibilities XMEGA and others are registered trademarks or trademarks of Atmel Corporation in U S and other countries Other terms and product names may be trademarks of others DISCLAIMER The information in this document is provided in connection with Atmel products No license express or implied by estoppel or otherwise to any intellectual property right is granted by this document or in connection with the sale of Atmel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIA
12. ega256RFR2 RF signal amplifier antenna 8 megabit data flash and trickle charge timekeeping chip The ATmega256RFR2 in charge of the communication between the kit and PC software and communicate with the LED Driver board to control the LED String by TWI bus LED Driver Board is configured as two ATxmega8E5 devices and four parallel LED drive circuits The four LED Strings divided into two groups one ATxmega8E5 control two of them AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 3 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Figure 2 1 shows the available features on the MCU control board Figure 2 1 Overview of the MCU Control Board of the Kit Antenna JTAG UART Button DataFlash Back up power of Trickle Connector Connector Not mounted Charge Timekeep Chip LED Indicator Not mounted ala Cal A08 1990 Re 3 LED MCU Board Power Amplification F Trickle Charge Timekeep Chip ATmega256RFR2 Temperature Light Sensor Connect to LED Drive Board Sensor Not mounted Not mounted MCU Control Board Figure 2 2 shows the available features on the LED Drive board Figure 2 2 Overview of the LED Drive Board of the Kit Connect to MCU Board Connect to LED Strings PDI Interface ATXmega8E5 Connect to Power Boart ATXmega8E5 PDI Interface Antenna DCto DC Four Parallel LED Drive Connect to MCU
13. ement PDI programming Atmel Studio 6 Atmel Studio 6 is a free Atmel IDE for development of C C and assembler code for Atmel microcontrollers Atmel JTAGICE3 JTAGICE3 is a mid range development tool for Atmel AVR 8 and 32 bit microcontrollers with on chip debugging for source level symbolic debugging Nano Trace if supported by the device and device programming 2 Overview The Atmel AVR 100W Commercial LED Light with Wireless Connection kit is intended to demonstrate the Atmel AVR ATmega256RFR2 single chip microcontroller and radio transceiver which is used in the LED Lighting application via Lightweight Mesh protocol the two Atmel AVR ATxmega8E5 devices are used as the LED driver The ATmega256RFR2 communicate with ATxmega8E5 via TWI bus The kit can drive four individual parallel high power LED Strings Each String can output 850mA under 38V so the general output power can reach over 100W The LED string can be controlled individually by PWM signal it can easily realize the on off and tunable brightness The control commands come from the PC software via wireless communication The kit includes three boards Power Supply Board MCU Control Board and LED Drive Board Power Supply Board contains two AC to DC switching power supplies one dedicates for four parallel high power LED strings and it provides 40V up to 3 5A Another is standby power for MCUs and it provides 12V 100mA and 6V 20mA MCU Control Board contains the MCU ATm
14. fically designated by Atmel as military grade Atmel products are not designed nor intended for use in automotive applications unless specifically designated by Atmel as automotive grade
15. ficiency is more than 89 with the rated output load and rated input AC voltage About the standby power supply the iw1706 is used to PWM controller The standby power supply uses a primary side control technology to eliminate the opto isolated feedback and secondary regulation circuits required in traditional designs The standby power supply works at the fixed frequency Discontinuous Conduction Mode DCM under heavy load and switches to variable frequency operation under light load to get the maximum efficiency In other words it uses adaptive multi mode PWM PFM control to dynamically change the BJT switching frequency for efficiency and EMI The standby power supply provides 12V 100mA and 6V 20mA for system The main power supply and standby power supply are also build in fault protection features include overvoltage protection OVP output short circuit protection SCP and over current protection OCP BUCK LED Driver Buck converter and linear driver are used to drive LED strings Figure 4 3 shows the diagram of the BUCK LED driver Figure 4 3 Diagram of BUCK LED Driver BUCK Converter Linear LED driver Ql PWM yn x V Accelerating circuit Power G Q2 ATxmega8E5 7 7 ia Dimming In the Buck converter the Atmel ATxmega8E5 MCU generates the fixed 50kHz PWM to drive Q1 MOSFET and the Buck converter output proper voltage for LED string When MCU detected the voltage at the Drain of the Q2 AT03201 100W Com
16. ht with Wireless Connection HW User Guide ApplicationNote_052014 Figure 1 100W Commercial LED Light with Wireless Connection 2 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 1 Related Items The following list contains links to the most relevant documents for the 100W Commercial LED Light with Wireless Connection Atmel MCU Wireless ATmega256RFR2 ATmega128RFR2 ATmega64RFR2 Summary Datasheet The document contains complete and detailed description of all modules included in the Atmel MCU wireless microcontroller family Atmel MCU Wireless ATmega256RFR2 ATmega128RFR2 ATmega64RFR2 Datasheet ATmega256RFR2 is the microcontroller used in this solution Atmel AVR10004 RCB256RFR2 Hardware User Manual The document describes the usage design and layout of the Atmel ATmega256RFR2 radio controller board ATxmega32E5 ATxmega16E5 ATxmega8E5 Preliminary Datasheet ATxmega8E5 is the microcontroller used in this solution Atmel AVR XMEGA MANUAL The document contains complete and detailed description of all modules included in the Atmel AVR XMEGA E microcontroller family AVR1612 PDI programming driver The Program and Debug Interface PDI is an Atmel proprietary interface for external programming and on chip debugging of the device This application note describes how to impl
17. mercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 11 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 12 more than 0 3V the MCU will immediately turn off the PWM signal and then turn off the Q1 MOSFET So the voltage of the C1 will turn down until the voltage at the Drain of the Q2 less than 0 3V and then turn on Q1 MOSFET to provide power for LED string This process is immediately achieved by on chip hardware modules linking the Event System Controller module to the Fault Extension module in the Atmel ATxmega8E5 In the Buck Converter circuit the response speed of the Q1 MOSFET should be as fast as possible and delay time should be as short as possible between the PWM output of the MCU and the drive of the Q1 MOSFET So the accelerating circuit is needed in the BUCK Converter The linear driver is used to drive LED string current for dimming The ATxmega8E5 MCU generates the fixed 60kHz PWM to drive external N CH MOSFET Q2 The R1 and C2 consist of low pass filter The U1 operational amplifier is consisted of negative feedback circuit The R1 and R2 consisted of voltage division circuit So the R1 R2 C2 U1 and Q2 consisted of the linear constant current source Suppose the value of the Rs and maximum current of the LED String the user can turn the value of R1 and R2 to set the maximum current of the LED String from the hardware design The relationship be
18. mercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 Pin on AVR ATxmega8E5 Measure Function of the circuit Measure the output voltage of another LED String Measure the output voltage of one LED String PAS Measure the current of one LED String PD7 Measure the current of another LED String The Atmel ATxmega8E5 device is debugged and programmed via PDI interface Table 4 4 PDI Interface Connection Pin on AVR ATxmega8E5 PDI Header For more information about the buck circuit see the application note Atmel AT04204 Design a Buck circuit with XMEGA E The ATxmega8E5 device communicates with ATmega256RFR2 via TWI bus Table 4 5 TWI Interface Connections Pin on AVR ATxmega8E5 Pin on AVR ATmega256RFR2 TWI Interface TW SDA Eo E 4 3 RF Transceiver The Atmel AVR ATmega256RFR2 device integrates a high performance RF CMOS 2 4GHz radio transceiver To get the RF function only four components are needed ATmega256RFR2 Balun Capacitance and Antenna Figure 4 4 RF Function Circuit Antenna RFP my ATmega256RFR2 RFN PCB layout is quite important for the high RF performance The application note Atmel AVR10004 RCB256RFR2 Hardware User Manual will guide you how to design the RF PCB In order to expand transmission distance a Power Amplifier PA circuit is added into the system The user can choose whether to use the PA function via soldering cap C2 C3 and removing cap C1
19. r Function J701 JTAG UART interface for programming and debug Connector between the Power Supply Board and LED Driver Board Connector the LED Driver Board and MCU Board AC source connector CN401 CN402 CN501 CN502 LED Strings Connector 3 1 JTAG UART Header The Atmel AVR ATmega256RFR2 can be programmed and debugged via JTAG interface Any tools which carry the JTAG interface can program and debug the kit JTAGICE3 is recommended for programming The definition of the JTAG interface can be found in Table 3 2 Table 3 2 AVR ATmega256RFR2 Programming and Debugging Interface JTAG Pin on programming header Pin on AVR ATmega256RFR2 JTAG TDO The definition of the UART interface can be found in Table 3 3 Table 3 3 AVR ATmega256RFR2 Universal Asynchronous Receiver Transmitter Interface UART Pin on programming header Pin on AVR ATmega256RFR2 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE 7 Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 3 2 3 3 Pin on programming header Pin on AVR ATmega256RFR2 The JTAG and UART interface uses the different pins at the same header J701 PDI Header The Atmel AVR ATxmega8E5 devices can be programmed and debugged via PDI header Any tools which carry the PDI interface can program and debug the kit JTAGICE3 is recommended for programming The definition of the PDI
20. re two AC to DC switching power supplies One is dedicate for LED strings and the other is standby power supply for MCUs The standby power supply is used for getting low static power low than 0 3W These two power supplies share one filter circuit Figure 4 2 shows the diagram of the AC to DC switching power supply Figure 4 2 AC to DC Power Supply System Block Diagram FILTER aie 6VDC 10 AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Commercial LED Light with Wireless Connection HW User Guide ApplicationNote_052014 4 2 The main power supply contains the Power Factor Correction PFC circuit device FA5612 works as the PFC converter in this application which makes the power factor value better than 99 with the rated load and rated input AC voltage The rectification voltage of the AC input voltage will boost to 400VDC The FA5641 is a quasi resonant type switching power supply control IC with excellent standby by characteristics The main power supply uses a secondary side control technology by opto isolated feedback for getting precise output voltage It also works at the fixed frequency Discontinuous Conduction Mode operation at heavy load and switches to variable frequency operation at light load for obtaining maximum efficiency The main power supply provides 40V 3 5A for LED Strings and input voltage range is 85V to 264VAC with 50 60Hz frequency The ef
21. tween the R1 and R2 as below Imax Rs Veo R1 R2 x R2 After rearrange and substitute R1 Vcc R2 Imax Rs R2 Imax s the maximum current of the LED string In the design considering the type of the LED string used in this reference design the max is set to be 850mA Rs is the sample resistance Vcc is the power supply of the MCU device In the design considering the type of the LED string used in this reference design the maximum LED string current is set to be 850mA and suppose Rs is 0 150 When MCU detected the voltage at the Source of the Q2 beyond 0 12V the MCU will immediately turn off the Q2 MOSFET until the voltage at the Source of the Q2 less than 0 12V then the ATxmega8E5 will turn on Q2 MOSFET again to provide power road for LED string Table 4 1 Buck Circuit PWM Connection Pin on AVR ATxmega8E5 Buck Circuit PWM PWM signal for another BUCK circuit Table 4 2 Linear Driver of the LED Connection Pin on AVR ATxmega8E5 Linear Driver PWM signal for one Linear constant current source PWM signal for another Linear constant current source Table 4 3 Measure Function in the Buck and Linear Driver Circuit Connection Pin on AVR ATxmega8E5 Measure Function of the circuit Measure the input voltage of one LED String Measure the input voltage of another LED String AT03201 100W Commercial LED Light with Wireless Connection Hardware User Guide APPLICATION NOTE Atmel 42302A 100W Com
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