LEDO001 USER GUIDE Description This demonstration circuit consists of a simple connectable printed circuit board carrying an LED, a thermistor and switching links. It allows the evaluation and testing of attachable Zetex LED driver circuits with varying numbers of series connected LEDs. Performance • • • • • Typical color temperature – 6500K Viewing angle - 120° Maximum drive current – 500mA Maximum junction Temperature – 125°C Optical Efficiency – 40 lm/W The PCB construction is a single layer of printed copper. There is a solid aluminium backing for heat dissipation. The material used [1] is Aismalibar Cobritherm™ or similar, 1.5mm Al, 110µm dielectric and 35µm copper. It features 4 holes for M2.5 fixings if required. Ordering Information Order Number LEDO001 The board is fitted with a male 6-pin input connector. This mates with any of the Diodes Zetex Evaluation boards which are fitted with a suitable socket. At the opposite end, a female connector is fitted, to allow multiple LED extensions as shown in the schematic below. A jumper link is used to allow connection of the LED as the NEXT or LAST in the chain. A further jumper link is provided to select whether the thermistor on the board is connected (position TH), or whether the connection is passed to a board further down the chain (PASSTH). The LEDO001 is fitted with the Osram LWW5SM LED: http://catalog.osram-os.com Issue 1 – August 2009 www.diodes.com © Diodes Incorporated 2009 1 of 4 LEDO001 Schematic D1 IN- LuxeonK2 A THOUT JP2 1 2 3 OUT- TH JP1 Select Thermistor PL1 ININTHIN THC IN+ IN+ PASSTH 6 5 4 3 2 1 R1 10k THIN THC 3 2 1 NEXT 6 5 4 3 2 1 LAST Select LED OUT+ OUTOUTTHOUT THC OUT+ OUT+ SK1 PCB Layout Top Side USAGE There are two circuits on the board: The LED circuit and the thermistor circuit. The input (PL1) and output (SK1) connector pins 1+2 and 5+6 are used for the LED, and 4 and 5 are used for the thermistor. LED circuit If only one LED board is being used, or is the last in a chain of several boards, the jumper JP1 should be inserted in the 'LAST' position. This connects the LED directly across pins 1+2 and 5+6 of input connector PL1. If several boards are being used in a chain, and the board concerned is not in the last position, the jumper JP1 should be inserted in the 'NEXT' position. This connects the LED in series between pins 5+6 on the input connector PL1 and pins 5+6 on the output connector SK1. It is not possible to configure the board for multiple LEDs in parallel. Issue 1 – August 2009 www.diodes.com © Diodes Incorporated 2009 2 of 4 LEDO001 Thermistor circuit In cases where the thermistor is not required, the position of JP2 is irrelevant but it should be removed if any other connections are made to pins 4 and 5 of PL1 or SK1. If the thermistor is required, and only one LED board is being used, the jumper JP2 should be inserted in the 'TH' position. This connects the thermistor directly across pins 3 and 4 of the input connector PL1, thus making the thermistor 'active'. If several boards are being used in a chain, the board on which the thermistor is required to be active should be set with JP2 in the 'TH' position. All the other boards should be set with JP2 in the 'THPASS' position. This disconnects the other thermistors and creates a direct link between pin 4 on the input connector PL1 and pin 4 on the output connector SK1. It is not possible to configure the board for multiple thermistors in parallel. Parts List Count Designator 1 D1 1 2 Description Package Manufacturer Part Number Osram LWW5SG LED SMD Osram LWW5SM R1 10kΩ Thermistor 0805 Vishay 2381 615 JP1, JP2 3- way headers for links Samtec TSM-103-02-L-SV Input/ Output Count Designator Description 1 PL1 6 pin Input power connector (male) Horizontal header 1 SK1 Output connector (female) Function Connection to LED driver or to previous LED demonstration board in series Allows connection for new demonstration board to be added in series Manufacturer Part Number Samtec TSM-106-03-LSH Samtec SSM-106-L-SH Recommended Operating Conditions Symbol VF IF [1] Parameter Min Max Units Forward Voltage at IF = 350mA 2.7 3.8 V Forward current at TA=25°C 100 500 mA Cobritherm is a trademark of the Aismalibar Corporation Issue 1 – August 2009 www.diodes.com © Diodes Incorporated 2009 3 of 4 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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