LEDC001 User Guide Issue 1

LEDC001 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 - 5600K
Viewing angle - 120°
Maximum drive current - 1000mA
Industry’s lowest thermal resistance 8°C/W
Max junction Temperature - 150°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
LEDC001
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 LEDC001 is fitted with the
Cree XR-E lamp:
http://www.cree.com/products/pdf/XLamp7090
XR-E.pdf
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LEDC001
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
LAST
Select LED
OUT+
6
5
4
3
2
1
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.
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LEDC001
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
Description
1
D1
Cree X-lamp LED
1
R1
10kΩ Thermistor
2
JP1, JP2
3- way headers for
links
Package
0805
Manufacturer
Part Number
Cree
X-lamp
Vishay
2381 615
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-106-03L-SH
Samtec
SSM-106-LSH
Recommended Operating Conditions
Symbol
VF
IF
[1]
Parameter
Min
Max
Units
Forward Voltage at IF = 350mA
3.1
3.9
V
Forward current at TA= 25°C
-
1000
mA
Cobritherm is a trademark of the Aismalibar Corporation
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