DLD101EV1 User Guide Issue 1

DLD101EV1 USER GUIDE
Description
The board is intended for the evaluation of Jumpers 1, 2 and 3 on the evaluation board
DLD101, a linear mode constant current LED set the value of the LED current. Jumper 1
sets the LED current to 260mA, jumper 2
driver.
sets it to 45mA and jumper 3 sets it to 20mA.
When an input voltage higher than the
forward voltage of the LED string (max. 50V) The board also incorporates a PWM input
is applied to the board, the board supplies a operating between 0V and 5-10V, which can
fixed current to the LED string connected to be used for PWM dimming of the LED string.
its output.
Ordering Information
ORDER NUMBER
DLD101EV1
Please note evaluation boards are subject to availability and qualified leads
JP1 = 260mA
JP2 = 45mA
JP3 = 20mA
Figure 1. DLD101 evaluation board
Issue 1 – August 2011
© Diodes Incorporated, 2011 in figures
www.diodes.com
DLD101EV1
Quick Start Guide
Required Test Equipment
12V 2A adjustable power supply, digital multimeter and high brightness LEDs
Constant Current LED Driving Operation
1. Set the power supply to 8V for a string of 2 LEDs.
2. Set the current limit to 350mA.
3. Connect up the DLD101EV1 to the equipment as in Figure 1 above.
4. Set DMM1 to measure the LED current.
5. Set jumper to JP1 position. (Only one jumper should be fitted at any time).
6. Switch on the power supply and check that the LED lights up.
7. Check that the current measured on DMM1 is 260mA +/- 10mA.
8. Switch off the power supply and set jumper to JP2 position.
9. Switch on the power supply and check that the LED lights up.
10. Check that the current measured on DMM1 is 45mA +/- 5mA.
11. Switch off the power supply and set jumper to JP3 position.
12. Switch on the power supply and check that the LED lights up.
13. Check that the current measured on DMM1 is 20mA +/- 5mA.
DLD101EV1 Schematic
Anode
VCC
Vin
LED A
R1
82K
CATHODE
1
U1
D1
2
G1
3
NC
C1
4
LED K
DLD101
B1
B1'
S2
8
7
Q1
2N7002
PWM
6
R6
PWM 10K
5
E1
=Value
SL1
1nF
C1
SL2
R7
1M
1
2
1
2
1
2
JP1
JP2
JP3
R2
3R
GND
GND
Figure 2. PCB Schematic diagram
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
2
R3
3R9
R4
11R5
R5
28R
DLD101EV1
Parts List
Designator
U1
Q1
C1
R1
R2
R3
R4
R5
R6
R7
Description
Linear mode constant sink LED driver
Package
DFN3030D-8
Small signal MOSFET
Do not fit
Resistor, 82K +/- 1% 250ppm 125mW
Resistor, 3R +/- 1% 250ppm 250mW
Resistor, 3R9 +/- 1% 250ppm 250mW
Resistor, 11R5 +/- 0.1% 250ppm 125mW
Resistor, 28R +/- 1% 250ppm 125mW
Resistor, 10K0 +/- 1% 250ppm 125mW
Resistor, 1M0 +/- 1% 250ppm 125mW
Part Number
DLD101
SOT-23
2N7002
Manufacturer
Diodes Inc
Diodes Inc
0805
1206
1206
0805
0805
0805
0805
generic
generic
generic
generic
generic
generic
generic
Table 1. Parts list
Performance
Current out (A)
The performance of the DLD101 when used to regulate LED current is shown in Figure 3.
With only jumper 1 fitted, a load of 2 LEDs, and a supply of 8VDC, the LED current is around
300mA at 25°C PCB and LED temperature. Over the typical lighting board temperature
range, the LED current changes from 380mA at 0°C PCB temperature to 220mA at 85°C.
0.36
0.34
0.32
0.3
0.28
0.26
0.24
0.22
0.2
0
20
40
60
80
100
Temp (C)
Figure 3. LED current vs. PCB board temperature
PWM dimming functionality can be implemented by applying a signal between 0V and 5-10V
on the ‘PWM’ terminal. Figures 4, 5 and 6 show the LED current variation as the duty cycle
of a 400Hz signal changes.
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
3
DLD101EV1
300
Output Current (mA)
250
200
150
100
50
0
0
20
40
60
80
100
Duty Cycle (%)
Figure 4. Duty Cycle vs. output Current for JP1 Configuration (260mA) at 400Hz
50
Output Current (mA)
40
30
20
10
0
0
20
40
60
80
100
-10
Duty Cycle (%)
Figure 5. Duty Cycle vs. Output Current for JP2 Configuration (45mA) at 400Hz
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
4
DLD101EV1
20
Output Current (mA)
15
10
5
0
0
20
40
60
80
100
-5
Duty Cycle (%)
Figure 6. Duty Cycle vs. Output Current for JP3 Configuration (20mA) at 400Hz
PCB Copper Layout & Silk Screen –Top
Figure 7. PCB layout
The bottom layer is a solid plane connected to LED K
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
5
DLD101EV1
INTENTIONALLY BLANK
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
6
DLD101EV1
INTENTIONALLY BLANK
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
7
DLD101EV1
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).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements,
corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated
does not assume any liability arising out of the application or use of this document or any product described herein; neither
does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer
or user of this document or products described herein in such applications shall assume all risks of such use and will agree
to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website,
harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through
unauthorized sales channels. Should Customers purchase or use Diodes Incorporated products for any unintended or
unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless
against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or
death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product
names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or
systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use
provided in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably
be expected to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support
devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related
requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support
devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by
Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any
damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2011, Diodes Incorporated
www.diodes.com
Sales offices
The Americas
Europe
Taiwan
Shanghai
Shenzhen
Korea
3050 E. Hillcrest Drive
Kustermannpark
7F, No. 50,
Rm. 606, No.1158
Room A1103-04,
6 Floor, Changhwa B/D,
Westlake Village,
CA 91362-3154
Tel: (+1) 805 446 4800
Fax: (+1) 805 446 4850
Balanstraße 59,
D-81541 München
Germany
Tel: (+49) 894 549 490
Fax: (+49) 894 549 4949
Min Chuan Road
Hsin-Tien
Taipei, Taiwan
Tel: (+886) 289 146 000
Fax: (+886) 289 146 639
Changning Road
Shanghai, China
Tel: (+86) 215 241 4882
Fax (+86) 215 241 4891
ANLIAN Plaza, #4018
Jintian Road
Futian CBD,
Shenzhen, China
Tel: (+86) 755 882 849 88
Fax: (+86) 755 882 849 99
1005-5 Yeongtong-dong,
Yeongtong-gu, Suwon-si,
Gyeonggi-do, Korea 443-813
Tel: (+82) 312 731 884
Fax: (+82) 312 731 885
Issue 1 – August 2011
www.diodes.com
© Diodes Incorporated, 2011 in figures
8
Similar pages