Evaluates: MAX MAX31840 Evaluation Kit. Quick Start. General Description. Features. Required Equipment. Procedure. Test with AC or DC Source

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1 General Description The MAX3840 evaluation kit (EV kit) demonstrates the MAX3840 LED driver IC used for dimmable V MR6 as well as AR and other V lighting applications. The EV kit is configured in a boost topology that provides an output power of up to 3W for up to 35V LED forward voltage. The IC is designed for the boost architecture to address 35W and 50W MR6 LED replacement bulbs. The EV kit s typical efficiency 90% at V AC and features a power-factor correction of 0.9 (typ). The EV kit is a fully assembled and tested surface-mount PCB designed and optimized to accommodate an MR6 application form factor. The EV kit is dimmable with most electronic transformers and trailing-edge dimmer combinations. The EV kit includes bleeder and constant power circuits for enhanced electronic transformer performance. Features Input Voltage Ranges 9V AC to 3.V AC from AC Source 6.5V to 3.8V DC or Output of Electronic Transformers Drives Up to 35V LED Forward Voltage 36V Overvoltage Protection Up to 3W Output Power Demonstrates IC Power-Factor Correction Proven PCB Layout Fully Assembled and Tested Quick Start Required Equipment MAX3840 EV kit V AC or DC supply, or a V electronic transformer Trailing edge dimmer Current probe to measure the LED current Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. Test with AC or DC Source ) Connect the AC or DC source to the AC and AC test-point pads. ) Enable the power supply. 3) Measure the LED current using the current probe. Test with Electronic Transformer Plus Dimmer ) Connect the output of a trailing edge dimmer to the input of electronic transformer. ) Connect the output of the electronic transformer to the AC and AC test-point pads. 3) Connect the input of the dimmer to power outlet. 4) Turn on the dimmer. 5) Measure the LED current using the current probe. 6) Adjust dimmer setting to change brightness on the LED. Ordering Information appears at end of data sheet ; Rev 0; 8/7

2 Detailed Description of Hardware The MAX3840 EV kit demonstrates the MAX3840 MR6 LED driver. The MAX3840 is an average currentmode control LED driver IC for boost topology in lowvoltage SSL applications. The MAX3840 incorporates a proprietary circuit that enables deep dimming and an integrated bleeder to improve compatibility with a broad range of electronic transformers. The EV kit circuit is configured in boost topology that operates at the IC s fixed 700kHz switching frequency and provides up to 3W of output power for HBLEDs connected at the LED+ and LED- test-point holes. The EV kit circuit operates from a 6.5V to 3.8V AC or 9V to 3.V DC supply or from electronic transformers. The EV kit is designed on a proven oz copper, two layer, small PCB footprint design that fits in a MR6 application form factor. The IC regulates the average voltage on CS to 00mV. The average input current is set by the current-sense resistor R4. The average current is: 0. IAV = R 4 where 0. is the voltage at the IC s CS pin and R4 is in ohms. The R4 on the EV kit is 0.Ω and the average current is about 000mA. The CS pin monitors the current through the sense resistor R4. When V CS falls below 80mV, the bleeder FET is turned on to maintain the minimum load requirement and keep the electronic transformer on. Current through the bleeder FET is set by R: With 0.Ω R and 0.5Ω R5, the power consumption of the system is approximately 000mA x V IN = W (average current times input RMS voltage). This is equivalent to 50W halogen bulb. For 35W equivalent application, use 0.33Ω for R4 and 0.8Ω for R. R3 and C5 are lowpass filters to eliminate the highfrequency components and glitches on the output signal of the electronic transformer. The electronic transformer constantly outputs short pulses and checks the existence of any connected devices. If the load is too small, the electronic transformer does not turn on. The D diode provides a direct path for the electronic transformer to turn on the internal LDO of the MAX3840. The bleeder FET can be turned on only after LDO is enabled. Maximum LED+ Voltage The IC features an internal 36V overvoltage protection at the IN pin to protect the internal switching MOSFET from damage if the LED string is open or if the voltage on the LED string is too high. Electronic Transformer Compatibility The MR6 board was tested with 8 LEDs for electronic transformer compatibility and also with the appropriate dimmers. See Table for the results with the different transformer models tested. 0.5 IBLEEDER = R where 0.5 is the voltage at the BSRC pin and R is in ohms. The R on the EV kit is 0.5Ω, and I BLEEDER is about 000mA. R5 and R7 are used to provide protection to the bleeder FET against high voltage at the output of the rectifier. Maxim Integrated

3 Table. Electronic Transformers Tested MANUFACTURER (MODEL NAME) KEYSTONE RATED INPUT VOLTAGE AND POWER LED OUTPUT VOLTAGE (V) LED OUTPUT CURRENT (ma) KTET-75--SCP-DIM-HV-AL 0V, 75W PHILIPS LUXMAN HATCH ET-E ET-S ETH V to 40V 0W to 60W 0V to 40V 0W to 60W 0V to 40V 0W to 60W RS-60M 0V, 60W BL TECHNOLOGIES LIGHTECH RJ US CV-0/75-0V, 75W 9 86 LET 75 0V, 75W LET 60 0V, 60W 9. LET 75 BF 0V, 75W 9.3 HD75-0 0V,75W KS ELECTRONIC TRANSFORMER 0V, 50W Maxim Integrated 3

4 Component Suppliers SUPPLIER BOURNS DIODES INCORPORATED INTERNATIONAL RECTIFIER MICRO COMMERCIAL COMPONENTS MURATA NICHICON PANASONIC ROHM SEMICONDUCTOR STACKPOLE ELECTRONICS INC TDK TOSHIBA YOGEO WEBSITE na.industrial.panasonic.com toshiba.semicon-storage.com Note: Indicate that you are using the MAX3840 when contacting these component suppliers. Ordering Information PART MAX3840EVKIT# #Denotes RoHS compliant. TYPE EV Kit Maxim Integrated 4

5 MAX3840 EV Kit Bill of Materials ITEM REF_DES DNI/DNP QTY MFG PART # MANUFACTURER VALUE DESCRIPTION AC, AC N/A N/A TP_SMD_3MM TEST POINT; PAD DIA 3MM; SMD C GRM55R7E47KA0 MURATA 4700PF CAPACITOR; SMT (040); CERAMIC CHIP; 4700PF; 5V; TOL = 0%; TG = -55 C TO +5 C; TC = X7R; 3 C CGAB3X7RH04K; C005X7RH04K050BB; GRM55R7H04KE4 TDK; MURATA 0.µF CAPACITOR; SMT (040); CERAMIC CHIP; 0.µF; 50V; TOL = 0%; TG = -55 C TO +5 C; TC = X7R 4 C3 UMK07BJ05KA-T; C608X5RH05K080AB; CL0A05KB8NNN; GRM88R6H05KAAL TAIYO YUDEN; TDK; SAMSUNG; MURATA µf CAPACITOR; SMT (0603); CERAMIC CHIP; µf; 50V; TOL = 0%; MODEL = _MK SERIES; TG = -55 C TO +85 C 5 C4 UPWH5MPDTD NICHICON 50µF 6 C5 GRM55R7C4KA MURATA 0.µF CAPACITOR; THROUGH HOLE-RADIAL LEAD; ALUMINUM-ELECTROLYTIC; 50µF; 50V; TOL = 0% CAPACITOR; SMT (040); CERAMIC; 0.µF; 6V; TOL = 0%; MODEL = GRM SERIES; TG = -55 C TO +5 C; TC = X7R 7 D SS47 TOSHIBA SS47 DIODE; SCH; SMT (SOD-93); PIV = 45V; IF = 0.A 8 D B360A-3-F DIODES INCORPORATED B360A-3-F DIODE; SCH; SMA; PIV = 60V; IF = 3A 9 L VLS6045EX-0M TDK 00UH INDUCTOR; SMT; WOUND FERRITE; 00µH; TOL = ±0%; 0.9A; 0 Q IRLML50PBF INTERNATIONAL RECTIFIER IRLML50PBF R RNCP0603FTD00R STACKPOLE ELECTRONICS INC 00 R CSR06FTR500 STACKPOLE ELECTRONICS INC R3 ERJ-RKF5600X PANASONIC R4 RL0805FR-7W0RL YAGEO 0. 5 R5, R7 ERJ4YJ3R9 PANASONIC U MAX3840 MAXIM MAX3840 TRAN; N-CHANNEL MOSFET; NCH; SOT-3; PD-(0.8W); I-(4.A); V-(0V) RESISTOR; 0603; 00Ω; %; 00PPM; 0.5W; THIN FILM RESISTOR; 06; 0.5Ω; %; 00PPM; 0.5W; THICK FILM RESISTOR, 040, 560Ω, %, 00PPM, 0.065W, THICK FILM RESISTOR; 0805; 0.Ω; %; 600PPM; 0.5W; THICK FILM RESISTOR; 0; 3.9Ω; 5%; PPM; 0.5W; THICK FILM EVKIT PART-IC; TDFN8-EP; MR6 LED DRIVER WITH INTEGRATED CONTROL MOSFET AND DEEP DIMMING; PACKAGE CODE: T833+3; PACKAGE OUTLINE: -037P 7 U MB6S MICRO COMMERCIAL COMPONENTS MB6S DIODE; SCH; TO-69AA; PIV = 60V; IF = A 8 PCB MAX3840 MAXIM PCB PCB:MAX LED+, LED- DNP KEYSTONE N/A TOTAL 0 TEST POINT; PIN DIA = 0.IN; TOTAL LENGTH = 0.3IN; BOARD HOLE = 0.04IN; YELLOW; PHOSPHOR BRONZE WIRE SILVER PLATE FINISH; NOTE: DNI--> DO NOT INSTALL(PACKOUT) ; DNP--> DO NOT PROCURE Maxim Integrated 5

6 Maxim Integrated 6 MAX3840 Evaluation Kit MAX3840 EV Kit Schematic 3.9 IRLML50PBF 0.5 B360A-3-F DNI 4700PF 0.UF UH 560 MB6S UF 00 50UF DNI 0. 0.UF 50V MAX3840 SS47 AC R7 Q R AC C LED+ D U R5 C3 C5 C4 L D R3 C LED- R R4 U LED+ ACREC LED- AC LED+ AC ACREC LED A C A C G S D - + AC AC SOURCE CS BSRC BGT AVDET ACREC IN DRAIN EP

7 MAX3840 EV Kit PCB Layout Diagrams.0.0 MAX3840 PCB Layout Top Silkscreen MAX3840 PCB Layout Top.0.0 MAX3840 PCB Layout Bottom MAX3840 PCB Layout Bottom Silkscreen Maxim Integrated 7

8 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 8/7 Initial release For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 07 Maxim Integrated Products, Inc. 8