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
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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
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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.
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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
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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
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DLD101EV1
INTENTIONALLY BLANK
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DLD101EV1
INTENTIONALLY BLANK
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DLD101EV1
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