In recent years, the application fields of high-brightness LEDs have been increasing, ranging from mobile device backlights, medium and large-sized LCD backlights, automotive interior and exterior lighting to general lighting. Common DC-DC LED lighting applications include landscape lighting, internal low-voltage road lighting, solar-powered lighting, automotive lighting, emergency vehicle lighting, marine applications, low-voltage halogen replacement, and aircraft interior lighting. This article will focus on how to choose the right ON Semiconductor energy-efficient driver solution for different DC-DC LED lighting applications.
LED DC-DC Switching Regulator Topology
According to the relationship between input voltage and output voltage, we can classify the topology of LED DC-DC switching regulator into the following types:
Buck: Suitable for applications where the minimum input voltage is always higher than the maximum voltage of the LED string under all operating conditions. For example, use this topology when driving a single 1 W LED with a 12 V supply.
Boost: Suitable for applications where the maximum input voltage is always below the minimum voltage of the LED string under all operating conditions. For example, use this topology when driving 6 LEDs with a 5 V supply.
Buck-Boost, or Single-Ended Primary Inductor Converter (SEPIC): Suitable for applications where the input voltage overlaps the output voltage. For example, this topology can be used when driving 4 LEDs with a 12 V car battery.
Different topologies are suitable for different LED driver solutions. As the premier high-performance solution provider for energy-efficient electronics, ON Semiconductor offers a broad range of energy-efficient drive solutions for a wide range of LED lighting applications, using the company's expertise in power management and expertise. A variety of energy efficient DC-DC LED lighting solutions.
LED DC-DC Buck Driver Solution
Typical LED DC-DC step-down applications include high-brightness modular strips used in trunking, bookcases, and display cabinet lights, typically 4 LEDs per strip (11.5 x 1 inch), depending on the color, light The efficiency is 23 to 47 lm/W and the voltage is 23 to 25 V.
Depending on the frequency and current, ON Semiconductor can use different LED DC-DC buck driver solutions for this application, including the NCL30100 controller, CAT4201 regulator, and NCP3065/ that can be configured as a buck regulator. NCV3065, NCP3066/NCV3066 regulators and controllers (see Figure 1). Each of these programs has its own characteristics.
For example, the NCL30100 acts as a controller and does not integrate FETs itself, but it supports the use of cost-effective N-channel MOSFETs as external components that regulate current and operate at 100% duty cycle. However, this component has a supply voltage (VCC) of 18 V, requires external components to support higher voltages, and is required for a defined number of LED designs. The NCL30100 is suitable for applications such as MR16 bulbs, 12 V landscape lighting, solar powered LED lighting, linear lighting and kanban text circuits and logo backlighting.
The CAT4201 is a complete power converter with integrated MOSFET switch. It is available in a small TSOT5 package with a maximum voltage of 36 Vdc (withstand 40 V transient voltage) and can drive up to 7 serial LEDs with a total voltage of 32 V. The power supply efficiency is up to 94. %, providing current limiting and thermal protection. However, this component requires an output capacitor in most applications and the LED output current is limited to a maximum of 350 mA. The CAT4201 is suitable for applications such as 12 V and 24 V lighting systems, automotive and aircraft lighting, and general lighting.
The NCP3065 and NCP3066, as well as the corresponding automotive-certified versions NCV3065 and NCV3066, are flexible switching regulators that can be configured for buck, boost and buck-boost configurations. When configured as an LED buck regulator, it can operate without large output capacitors, supports +40 V/1.5 A typical peak switch current, and can set different outputs such as 350 mA, 700 mA, and 1,000 mA. The current can also be matched with the dimming requirements. NCP3065/6 and NCV3065/6 are suitable for automotive and marine lighting, high power LED drivers, constant current sources, low voltage LED lighting (landscape, road, solar and MR16 replacement) applications.
LED DC-DC boost driver solution
As described above, the NCP3065/6 and NCV3065/6 can be configured in different configurations, and the right side of FIG. 4 shows an application circuit diagram configured as a boost structure.
In addition, ON Semiconductor will introduce the NCL30131 LED boost driver specifically for the energy-efficient boost mode, which is suitable for driving long strings of high-brightness LEDs. The NCL30131 is a switching boost controller capable of N-channel FETs that can be used to build energy-efficient LED boost drivers. This component uses a voltage mode pulse width modulation (PWM) feedback mechanism with an operational transconductance amplifier (OTA). This component has high drive capability to drive high current/high efficiency MOSFETs. The input voltage range is extremely wide, between 4.5 V and 28 V. The NCL30131 offers a 300/600/1,000 kHz switching frequency and offers a wide range of protection features such as programmable current limit, short circuit protection, thermal shutdown, overvoltage protection and undervoltage lockout for MR16 building lighting, light strips, landscape lighting and Applications such as lighting in cabinets.
Figure 5: Typical circuit diagram of the NCL30131 high-efficiency boost LED driver.
Based on the NCL30131, the +12 Vin @ ~700 mA demo board that drives 10 high-brightness LEDs shows that the energy efficiency is higher than 90% and the line regulation accuracy is less than 0.2%.
In addition to the NCL30131, ON Semiconductor also offers another LED DC-DC boost converter, the CAT4240. This device operates with a fixed switching frequency of 1 MHz and is capable of using small external ceramic capacitors and inductors. The high-voltage output section of this component is ideal for driving medium-sized and large-sized panel displays with up to 10 serial white LEDs with up to 94% efficiency.
LED DC-DC Buck-Boost Driver Solution
Typical LED buck-boost applications include driving a module with 3 to 4 LEDs on a 12 V ac or 12 V dc supply. In this application, the NCP3065/6 controller configured as a buck-boost topology can be used to meet the application requirements where the input voltage and output voltage overlap. Figure 6 shows the circuit diagram of the NCP3065 in this type of application.
Figure 6: Circuit diagram of the NCP3065 LED buck-boost application.
GreenPoint® online design simulation tool accelerates DC-DC LED lighting design
As the premier supplier of high performance silicon solutions for energy efficient electronics, ON Semiconductor offers complete system solutions for a wide range of LED lighting applications, including DC-DC LED lighting applications, including power, communications, optical sensors, MOSFETs. , rectifiers, protection, filters and thermal management products.
In addition, to help designers accelerate LED lighting design, ON Semiconductor also offers GreenPoint® online design simulation tools that allow designers to easily “select selected LED drivers†and “determine design requirements†by sitting in front of the workbench. Several steps, such as “automatically generate design circuit diagramsâ€, “simulation and verificationâ€, “generate bills of materials and reportsâ€, “download reports as PDF files†and “save files and shareâ€, significantly shorten development time and speed up product launch .
This online design tool currently supports a variety of applications for ON Semiconductor's energy-efficient LED driver products, including DC-DC LED drivers including NCP3065, NCP3066, NCL30100, CAT4201, NCP1529 (Buck Solution), NCP5030 (Buck) - Boost scheme) and NCP5050 (boost scheme). More products will be supported in the future.
Figure 7: ON Semiconductor's GreenPoint® online design tool helps accelerate LED lighting design.
to sum up
As the premier high-performance solution provider for energy-efficient electronic products, ON Semiconductor offers a variety of energy-efficient DC-DC LED lighting products that are user-friendly depending on the application. ON Semiconductor also offers online analog design tools, demonstration boards and a variety of reference designs to demonstrate the customer's simplified design and use. The design of ON Semiconductor's LED driver products continues to be small, energy-efficient and low-cost, helping to drive the LED lighting market forward.
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