According to the survey, global energy consumption is caused by the use of traditional incandescent lighting every year, and LED lighting can effectively reduce energy consumption and reduce greenhouse gas emissions. Therefore, from the perspective of environmental protection or cost saving, LED lighting is currently High-performance lighting solutions on the market, and as countries around the world have successively proposed the elimination of incandescent lamps and the promotion of LED lights, I believe that LED lighting is the trend of the future.
Of course, while LED lights can replace existing light sources and can be quickly applied in lighting systems, retrofitting existing light sources with LEDs is not as simple as is generally assumed. First of all, the LED lamp does not have the same resistance characteristics as the incandescent lamp. Secondly, the rated power of the LED lamp is usually significantly lower than that of the existing light source. When working, it may cause interference effects such as flicker or other types of strobe. Light modulation, so to popularize LED lighting, an excellent LED lighting solution is essential. Today, Aiban.com recommends two excellent low-power LED lighting solutions - EVALLEDICL8201F1 module and EVALLEDICL8201F2 module, which can be applied to GU10 and T8 LED applications respectively.
Since both modules are based on LED power applications, and are based on the same LED control chip ICL8201 from Infineon, there is little difference in the overall circuit structure, mainly for the application of two specific LED fields, the choice of MOS tube There are some discrepancies, so we will mainly introduce a LED power module (EVALLEDICL8201F1 module) in detail, and another (EVALLEDICL8201F2 module) as a comparison object. In the actual test session, we will have two models. The LED power modules are tested under extreme load conditions.
EVALLEDICL8201F1 module
First look at the samples taken by Aiban. The package is a simple kraft paperboard. The EVALLEDICL8201F1 module is wrapped in an electrostatic bag. A total of two modules are obtained.
Open the electrostatic bag at first glance, EVALLEDICL8201F1 module appearance is similar to the 15W_CE1K0 power module (evaluation) previously reviewed by Aiban.com, but the onboard components are less, simpler, and the size is only 33mmx 20mmx 18mm, as follows The figure shows.
The EVALLEDICL8201F1 module is a low cost, high efficiency, high power factor universal LED lighting solution (7.5W, 180mA). The basic parameters are as follows:
Input voltage & frequency: 90VAC~265VAC (60/50Hz)
Output voltage, current, power: 33V~47V, 180mA, 7.5W
Passed the EN55015 certification (here basically refers to the electromagnetic compatibility certification of the luminaire)
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From the simple characteristics of the module, we can easily find that this is a wide input range LED power module, which mainly includes the input power supply part, LED control part and LED drive circuit, as shown in the figure below. (next page)
The EVALLEDICL8201F1 module converts AC power into DC power in the power supply section and then filters it; the control part is realized by the Infineon LED controller ICL8201; the Infineon CoolMOS IPU50R3K0CE is implemented on the LED driver circuit. The schematic diagram of the whole module is as follows. In this schematic, we need to focus on the Infineon LED controller ICL8201 and the CoolMOS IPU50R3K0CE.
Infineon LED controller ICL8201
We first came to know the core of the EVALLEDICL8201F1 module - Infineon's new LED controller ICL8201.
The ICL8201 is a cascade (cascode) current mode controller in a SOT23-6 package that supports small size and low cost designs for non-isolated floating buck topologies. It can reduce system cost and improve system efficiency. Then someone has doubts, how to reduce the system cost? How to improve system efficiency?
As shown in the reference design above, the highly integrated ICL8201 controller circuit structure eliminates the need for auxiliary windings to power the IC and eliminates the need for high-voltage depletion MOSFETs for fast lighting, which greatly reduces system cost. In addition, the cascade topology eliminates the losses that the startup resistors generate during the entire operation, helping to increase system efficiency and reliability.
For this ICL8201 of Infineon, the author summarizes the following advantages:
Very few external components required, supporting small size and low cost
IC supports single inductor, no auxiliary winding
Advanced tandem structure, no need for high voltage starter unit, support 90~305Vac
Complete protection mode, including intelligent over temperature protection
LED output current up to 500mA
The ICL8201 supports both DC and AC inputs for high power factor correction (PFC), improves efficiency and reduces EMI design in critical conduction mode, eliminates the need for zero-crossing windings, and is equipped with an external power switch (such as the CoolMOSFET series in the reference design) The maximum supply current of 500mA is very suitable for the design of the driving power platform for LED lighting. In addition, the over-temperature protection function of the ICL8201 can effectively protect the product. As shown below, at 135°C, the current is completely cut off.
CoolMOS IPU50R3K0CE
IPU50R3K0CE is Infineon CoolMOS series MOS tube, with very low on-state resistance Rds and Eoss, suitable for FPC, hard switching PWM, resonant switching PWM and other functions. The specific parameters of MOS tube are as follows. (next page)
Note: The parameters in the table are important basis for MOS tube selection. VDS and ID represent the maximum allowable voltage and current in the circuit, but there should be a margin in the actual design. RDS is the on-state resistance of MOS tube, which affects the conversion efficiency of switching power supply. Qg refers to the MOS tube junction capacitance, which affects the loss of MOS tube switch. The larger the switching frequency, the more important the Qg parameter.
EVALLEDICL8201F2 module
After reading the EVALLEDICL8201F1 module, let's take a look at the difference between another Infineon EVALLEDICL8201F2 module, as shown below.
The EVALLEDICL8201F2 module is 42mm x 20mm x 15mm in size and has a larger head than the EVALLEDICL8201F1 module. It also uses a cascade (cascode) current mode controller ICL8201 controller, non-isolated structure. As can be seen from the comparison of the following figure, the important difference between the two LED power modules is the selection of the MOS tube.
The EVALLEDICL8201F2 module uses the Infineon IPS65R1K5CE (IPAK) MOS transistor, which has a higher rated voltage and current value than the MOS of the EVALLEDICL8201F1 module, and has a lower on-resistance value, but, in contrast, its MOS The tube junction capacitance should be slightly larger, which will affect the switching loss of the MOS tube. Therefore, when designing the power supply engineer, it is necessary to select a suitable MOS tube according to the practical application. The specific parameters of the IPS65R1K5CE are as follows.
Finally, let's compare the parameters of the next two LED power modules, as shown in the following table:
EVALLEDICL8201F1 & EVALLEDICL8201F2 practical application performance
Experimental preparation:
EVALLEDICL8201F1 Module & EVALLEDICL8201F2 Module
One power analyzer (YOKOGAWA WT3000, especially thanks to Suzhou Omnik New Energy Technology Co., Ltd. for instrument testing)
Electronic load (since there is no corresponding LED power module as a load, temporarily replaced by electronic load)
After the test is ready, set up the test platform. The input power supply uses the AC input of the wide power supply (EVALLEDICL8201F1: 90VAC~265vac, EVALLEDICL8201F2: 170VAC~277VAC). The input power is first passed through the power analyzer and then used as the input of the power module. Since the modules are all constant current outputs, the electronic load acts as a "load" with a load range of the maximum, minimum and intermediate values ​​of the two LED modules. The test platform is shown below. (next page)
EVALLEDICL8201F1 module test results
We first tested the EVALLEDICL8201F1 module. The test range selected the limit value of the module's standard load (33V~47V, 180mA output). The specific test data is as follows:
On the whole, the overall efficiency of the Infineon EVALLEDICL8201F1 module is good, about 89%; in each test environment, the power factor is greater than 95% at the lowest input voltage, and the power factor is greater than the highest input voltage. 80%; the other total harmonic distortion (THD) is less than 20% at the lowest input voltage and less than 30% at the highest input voltage.
Taking the load as the intermediate value test case (LED under 40V, 180mA output load condition) as an example, we can draw the corresponding power factor and total harmonic distortion of the EVALLEDICL8201F1 module according to the test data, and the input voltage is as follows. The figure shows.
It can be seen that with the domestic power supply situation (220Vac), we can still design a better LED lighting solution according to the Infineon EVALLEDICL8201F1 module.
EVALLEDICL8201F2 module test results
In addition, we also tested another EVALLEDICL8201F2 power module, which is for T8 LED applications and has a larger power than the EVALLEDICL8201F1 module.
Similarly, build a test platform, but it should be noted that the input voltage of the EVALLEDICL8201F2 module is 170Vac~277Vac, and the output is 18W, 270mA. The test process is not described one by one. It can be seen that the EVALLEDICL8201F2 power module is slightly more efficient than the EVALLEDICL8201F1 module, thanks to the MOS tube with a smaller on-resistance value as we mentioned above.
This article introduces Infineon's 7.5W, 180mA low power LED lighting solution EVALLEDICL8201F1 and 18W, 270mA EVALLEDICL8201F2 module for T8 LED applications, both modules are based on Infineon's latest LED controller ICL8201, ICL8201 Has many excellent features, such as: support single inductor, no auxiliary winding, advanced cascade structure, no high voltage starter unit, wide voltage input range of 90~305Vac, few external components required, with Infineon IPU50R3K0CE Or the IPS65R1K5CE CoolMOS tube series can realize small size and low cost solutions for GU10 and T8 LED lighting systems.
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