Atec Chroma-63113A - Manual

All specifications are subject to change without notice. All specifications are subject to change without notice.
Power Electronics
Test Equipment
Photovoltaic
Test Equipment
11-12
Video & Color
Test Equipment
LCD/LCM
Test Equipment
Electrical Safety
Test Instruments
General Purpose Test Instruments
Pa
ss
ive
C
om
po
ne
nt
Test Instruments
LED
Test Equipment
Se
m
ico
nd
uc
tor
/IC
Test Equipment
PXI Instruments
&
Systems
Optical Inspection
Equipment
All specifications are subject to change without notice. All specifications are subject to change without notice.
Programmable DC Electronic Load Model 63110A/63113A
• Continued on next page ➟
KEY FEATURES
■ Unique LED mode for LED power driver test
■ Programmable LED operating resistance (Rd)
■ Programmable internal resistance (Rr) for
simulating LED ripple current
■
Fast response for PWM dimming test
■ Up to eight channels in one mainframe
■ 16-bit precision voltage and current
measurement with dual-range
■
Full Protection: OC, OP, OT protection and OV
alarm
As a constant current source, the LED power driver
has an output voltage range with a constant
output current. LED power drivers are usually
tested in one of the following ways :
1. With LEDs
2. Using resistors for loading
3. Using Electronic Loads in Constant Resistance
(CR) mode, or Constant Voltage (CV) mode
However, all these testing methods, each of them
has their own disadvantages.
As shown on the V-I curve in Figure 1, the LED has
a forward voltage V
F
and a operating resistance
(Rd). When using a resistor as loading, the V-I
curve of the resistor is not able to simulate the V-I
curve of the LED as shown on Figure 1. This may
cause the LED power driver to not start up due
to the difference in V-I characteristic between
the resistors and the LEDs. When using Electronic
Loads, the CR and CV mode settings are set for
when the LED is under stable operation and
therefore, is unable to simulate turn on or PWM
brightness control characteristics. This may cause
the LED power driver to function improperly
or trigger it's protection circuits. These testing
requirements can be achieved when using a LEDs
as a load; however, issues regarding the LED aging
as well as different LED power drivers may require
different types of LEDs or a number of LEDs. This
makes it inconvenient for mass production testing.
Figure 3 63110A dimming test
I
Figure 5 Simulate different characteristic of LEDs
V
V
F1
V
F2
V
F3
V
o
Io
R
d3
R
d2
R
d1
I
Io
V
o1
V
o2
V
o3
V
o4
Figure 4 Simulate different number of LEDs
R
d1
R
d2
R
d3
R
d4
Figure 2 LED dimming test
6312A : 2 in 1 Mainframe
6314A : 4 in 1 Mainframe
Chroma has created the industries first LED
Load Simulator for simulating LED loading with
our 63110A load model from our 6310A series
Electronic Loads. By setting the LED power driver's
output voltage, and current, the Electronic Load
can simulate the LED’s loading characteristics.
The LED’s forward voltage and operating
resistance can also be set to further adjust the
loading current and ripple current to better
simulate LED characteristics. The 63110A design
also has increased bandwidth to allow for PWM
dimming testing.
Figure 2 shows the dimming current waveform
of the LED. Figure 3 shows the dimming current
waveform when using 63110A as a load.The 6314A
holds up to four 63110A load modules, which will
result in an 8-channel 100W/channel load with
standard front-panel inputs. This makes it ideal
for testing single output and multiple output LED
driver. Additionally, the GO/NG output port is
useful for UUT's pass/fail testing on an automated
production line. All modules on the 6314A/6312A
mainframe share a common GPIB address to
synchronize and speed up the control of the load
modules and the read-back of data.
I
V
LED Curve
Vo
Io
Rd
Figure 1 LED V-I Characteristics
V
I
I
Io