APCPCWM_4828539:WP_0000001WP_0000001
APCPCWM_4828539:WP_0000001WP_0000001
Z-Power LED X10490
Technical Data Sheet
1
Application Note:
Designing with Acriche A4
SAWX4A0X
Introduction
The Acriche series of devices are
designed for ease of implementation
and readily connect to AC sources
emitting very high flux while minimizing
driver requirements.
Acriche products are long-lasting, environmentally
friendly semiconductor light sources that can be attached either
directly to AC voltages, or as with the A4, to a simple diode bridge
(see Fig 6).
Acriche’s thermal management exceeds other power LED solutions
incorporating state-of-the-art SMD technology, thermal path design,
and low thermal resistant materials.
Whether designing a spot light or tiled array, the Acriche A4 is an
ideal light source for general purpose illumination applications.
This application note provides assembly and handling information of
the A4 series.
Features
•
Connect using a simple
diode bridge directly to
AC power
•
Power Saving
•
Long Life Time
•
Simple BOM
•
Miniaturization
• Low thermal
resistance
• SMT solderability
• Lead Free product
• RoHS compliant
Applications
•
•
•
•
Architectural lighting
Residential lighting
Task lighting
Decorative/Pathway
lighting
Rev. 00
September 2011
www.acriche.com
서식번호 : SSC-QP-7-07-25 (Rev.00)
APCPCWM_4828539:WP_0000001WP_0000001
APCPCWM_4828539:WP_0000001WP_0000001
Z-Power LED X10490
Z-Power LED X10490
Technical Data Sheet
1. Component
3. Protection
2
Contents
1.1 Description -----------------------------------------------------------------------3
1.2 Mechanical Dimension ----------------------------------------------------------3
1.3 PCB solder pad layout -----------------------------------------------------------4
1.4 Junction Temperature -----------------------------------------------------------4
1.5 Lens handling --------------------------------------------------------------------5
2. Driver Configurations
2.1 Description -----------------------------------------------------------------------5
2.2 Proper Resistor Selection-------------------------------------------------------5
2.3 Optional Components/Configurations-----------------------------------------7
2.4 Circuit configuration performance -------------------------------------------18
2.5 Relative light output between AC and DC------------------------------------19
2.6 Combining different voltage bins---------------------------------------------20
2.7 Color bin selection -------------------------------------------------------------21
3.1 Description ----------------------------------------------------------------------22
3.2 Lightning surges, Voltage spikes or Ring Wave Protection ---------------22
3.3 Over-current and Over-temperature Protection----------------------------22
Rev. 00
September 2011
www.acriche.com
서식번호 : SSC-QP-7-07-25 (Rev.00)
APCPCWM_4828539:WP_0000001WP_0000001
APCPCWM_4828539:WP_0000001WP_0000001
Z-Power LED X10490
Z-Power LED X10490
Technical Data Sheet
3
1. Component
1.1 Description
The ACRICHE A4 emitter is designed to operate off of rectified high voltage AC. The A4 PKG
contains a high brightness, high voltage LED chip array on a ceramic substrate that functions as a
mechanical support for the chips and connects the LED chip to the anode and cathode of the
package. Each A4 emitter contains a zener diode to provide ESD protection. A silicone lens
covering the LED chip helps to extract the light and provide environmental protection.
Silicone lens
(over the chips)
Cathode
Anode
Ceramic substrate
Thermal pad
(electrically isolated)
Figure 1. ACRICHE A4 (left) and bottom of A4 (right)
1.2 Mechanical Dimensions
As seen in Fig 2 below, the theoretical optical center is located at the center of the A4 package.
The anode, cathode and thermal pads are located on the bottom of the package. The cathode
mark indicates the cathode pad location. The ceramic substrate electrically isolates the thermal
pad or slug from the cathode and anode. Electrical shocks can occur at high voltage, therefore
safety considerations should be taken into account by following UL Recommendations.
The A4 has been UL recognized.
Figure 2. ACRICHE A4 mechanical dimensions(mm)
Rev. 00
September 2011
www.acriche.com
서식번호 : SSC-QP-7-07-25 (Rev.00)
APCPCWM_4828539:WP_0000001WP_0000001
APCPCWM_4828539:WP_0000001WP_0000001
Z-Power LED X10490
Z-Power LED X10490
Technical Data Sheet
4
1.3 PCB solder pad layout
The ACRICHE A4 emitter should be mounted on a printed circuit board for electrical connections
and to give a proper thermal path between the LED package and the heat sink. A temperature
check point is recommended to be designed into the solder pad layout which can be used to
calculate the junction temperature for thermal degradation and life time calculations. The solder
pad should not be designed larger than the recommended size as the part may shift and excess
solder paste may form solder balls which can create electrical shorts between internal pads on the
package (Figure 4).
Temperature check point
6.4
6.4
0.5
2.6
4.4
Figure 3. Recommended PCB solder pad layout
Internal electrical shorts can occur from
Solder balls if excess solder paste is used.
The LED may be partially on or totally
turned off.
Figure 4. Incorrect soldering of the ACRICHE A4 emitter
1.4 Junction Temperature
The life time of the ACRICHE A4 emitter is most directly related to the junction temperature, but it
is impossible to measure the junction temperature directly without any damage. Tj can be
theoretically calculated by using the thermal resistance between the LED junction and the board.
The equation for Tj is: Tj[℃] = Tb[℃] + RΘ j-b[℃/W] x emitter power[W].
The equation of the emitter power is calculated using the following formula:
P[W] = Input Vrms[V] X Input Irms[A] X Power Factor – Irms
2
[A] X Resistor Value[Ω].
The rectifier power dissipation is negligible so we are not using this in the calculations, although
we do need the Power Factor(PF) for the A4 emitter. It is about 0.89 in the typical drive
configuration consisting of only a rectifier and a resistor. (Note: The PF is 1.00 generally in
constant current drive).
Silicone lens
T
j
(Junction Temperature)
T
b
(Board Temperature)
Chip
Ceramic substrate
Solder paste
Metal PCB
Rev. 00
Figure 5. Thermal modeling of the ACRICHE A4 emitter
September 2011
www.acriche.com
서식번호 : SSC-QP-7-07-25 (Rev.00)
APCPCWM_4828539:WP_0000001WP_0000001
APCPCWM_4828539:WP_0000001WP_0000001
Z-Power LED X10490
Z-Power LED X10490
Technical Data Sheet
5
1.5 Lens handling
Improper handling of the LED packages can damage the silicone lens. Avoid touching the silicone
dome of the LED especially with sharp tools. Pick up the LED on the sides of the package. Any
physical force to the silicone lens in excess of 3000gf will permanently and fatally damage the part.
The silicone dome is sensitive to dust and debris and can cause an optical output decrease. If dust
or debris accumulates on the lens, isopropyl alcohol (IPA) can be used to remove dust from the
lens.
2. Driver Configurations
2.1 Description
The ACRICHE A4 emitter is designed to operate directly off of AC line power(e.g 120Vac, 230Vac)
with a rectifier, resistors or optional capacitor(s). This compact circuit can minimize the lighting
product size, help simplify thermal design, and increase overall product reliability. It is also an
economical solution because you do not need to have all the extra components. Typical low
voltage DC circuits require a transformer, regulator and multiple discrete components such as
capacitors, inductors, resistors.
2.2 Proper resistor selection
Operating the ACRICHE A4 emitter requires a bridge rectifier and resistors at a minimum, since the
architecture of the A4 has been modified from the earlier versions of the Acriche family(A2, A3),
which did not need a bridge. This architecture has a string of LEDs in one direction only,
compared to the previous version which has strings in both directions, thereby not requiring the
diode bridge previously. Utilizing the new architecture, we are able to reduce the number of LEDs
needed, thereby reducing package size and price.
It is better to use higher than rated power resistors for reliability. The rated power of the resistor
should be chosen based on the equation Irms(A)*Irms(A)*Resistor value(ohms). The normal
power rating of a 3216 size resistor is 0.25W. If the power consumption in one resistor exceeds
the rated power of the resistor it is suggested to use multiple resistors in parallel.
Rev. 00
September 2011
www.acriche.com
서식번호 : SSC-QP-7-07-25 (Rev.00)
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