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LED lighting driver solutions with different power supplies and power levels

With the development of LED technology, the application of LED has expanded from traditional low-power portable product backlight to medium and high-power indoor lighting, outdoor lighting and flashlight applications. According to the different driving power, LED lighting can usually be divided into different types such as AC-DC (AC-DC) LED lighting, DC-DC (DC-DC) LED lighting power supply, and battery-powered LED flashlights. Different, such as 3WPAR16, 3×2WPAR20, 10W/15WPAR30, 15W/22WPAR38, 1WG13, 3WGU10, 1WMR11, 3WMR16, 3W/9W/15W recessed light, 1W-3W reading light, etc.

 1. AC-DC LED lighting solutions

ON semiconductor provides various off-line controllers and power factor correction (PFC) controllers in LED lighting applications powered by AC-DC power supplies, and provides different LED application solutions with isolation and non-isolation requirements. In isolated applications where there is no physical electrical connection between the AC line voltage and the LED, common topologies are flyback and dual Inductor plus single capacitor (LLC) half-bridge resonance. Different topologies are suitable for different power ranges or to meet specific design requirements. For example, the flyback topology is the standard choice for low to medium power applications less than 100W, while the LLC half-bridge topology is the preferred solution for high power and energy efficiency.

LED lighting driver solutions with different power supplies and power levels

Figure 1: Isolated topologies for different power ranges

In AC-DC LED lighting applications, low-power LED applications are usually driven with constant current (CC), and the constant voltage (CV) function is used as a protection function in the event of an open output. High-power LED applications may need to add power factor correction (PFC) to the circuit, and the two parts of the AC-DC conversion circuit and the LED driver circuit may adopt an integral configuration, that is, the two are fused together and are located in the lighting. Within the luminaire, a distributed configuration can also be used, as shown in Figure 2, thereby simplifying safety considerations and increasing system flexibility.

LED lighting driver solutions with different power supplies and power levels

Figure 2: Distributed configuration of high-power LED drivers

From the perspective of the specific power range of the application, the power solution applications of AC-DC LED lighting mainly include:

1W-8W: G13/GU10/PAR16/PAR20 lighting

8W-25W: PAR30/PAR38 lighting

50W-300W: Area lighting

With the development of LED technology, the application of LED has expanded from traditional low-power portable product backlight to medium and high-power indoor lighting, outdoor lighting and flashlight applications. According to the different driving power, LED lighting can usually be divided into different types such as AC-DC (AC-DC) LED lighting, DC-DC (DC-DC) LED lighting power supply, and battery-powered LED flashlights. Different, such as 3WPAR16, 3×2WPAR20, 10W/15WPAR30, 15W/22WPAR38, 1WG13, 3WGU10, 1WMR11, 3WMR16, 3W/9W/15W recessed light, 1W-3W reading light, etc.

 1. AC-DC LED lighting solutions

ON Semiconductor provides various off-line controllers and power factor correction (PFC) controllers in LED lighting applications powered by AC-DC power supplies, and provides different LED application solutions with isolation and non-isolation requirements. In isolated applications where there is no physical electrical connection between the AC line voltage and the LED, common topologies are flyback and dual inductor plus single capacitor (LLC) half-bridge resonance. Different topologies are suitable for different power ranges or to meet specific design requirements. For example, the flyback topology is the standard choice for low to medium power applications less than 100W, while the LLC half-bridge topology is the preferred solution for high power and energy efficiency.

LED lighting driver solutions with different power supplies and power levels

Figure 1: Isolated topologies for different power ranges

In AC-DC LED lighting applications, low-power LED applications are usually driven with constant current (CC), and the constant voltage (CV) function is used as a protection function in the event of an open output. High-power LED applications may need to add power factor correction (PFC) to the circuit, and the two parts of the AC-DC conversion circuit and the LED driver circuit may adopt an integral configuration, that is, the two are fused together and are located in the lighting. Within the luminaire, a distributed configuration can also be used, as shown in Figure 2, thereby simplifying safety considerations and increasing system flexibility.

LED lighting driver solutions with different power supplies and power levels

Figure 2: Distributed configuration of high-power LED drivers

From the perspective of the specific power range of the application, the power solution applications of AC-DC LED lighting mainly include:

1W-8W: G13/GU10/PAR16/PAR20 lighting

8W-25W: PAR30/PAR38 lighting

50W-300W: Area lighting

 1). 1W-8WAC-DCLED lighting application

This type of application requires an input voltage of 90 to 264Vac, with an energy efficiency of 80%. It also provides protection features such as short-circuit protection, over-voltage protection, and provides 350mA and 700mA constant current. Applications include G13, GU10, PAR16, PAR20 and recessed lights (downlight) etc.

ON Semiconductor’s NCP1015 self-powered monolithic switching regulator can be used in such applications. This device integrates a fixed frequency (65/100/130kHz) current mode controller and a 700V high voltage MOSFET, providing all the features required to build a robust low cost power supply such as soft start, frequency jitter, short circuit protection, cycle skip, Maximum peak current set point and dynamic self-powered function (no auxiliary winding required), etc. Figure 3 shows the circuit schematic of the NCP1015 in an isolated 1W-8W range AC-DC LED lighting application. It is worth mentioning that NCP1015 can also be used for non-isolated (without high-frequency transformers in the circuit) AC-DC LED lighting applications in the range of 1W-8W. Tapped inductors can be used in the circuit to increase the duty cycle of MOSFET operation. , and improve system energy efficiency and circuit performance.

LED lighting driver solutions with different power supplies and power levels

Figure 3: ON Semiconductor 8 W LED driver application circuit schematic (input voltage 85 to 264 Vac)

 2). 8W-25WAC-DCLED lighting application

The United States Department of Energy (DOE) “Energy Star” (ENERGYSTAR®) Solid State Lighting (SSL) specification mandates that power factor correction (PFC) be provided at any power level. This standard applies to a range of specific products, such as downlights, cabinet lights and table lamps, where the power factor of LED drivers must be greater than 0.7 for residential applications and greater than 0.9 for commercial applications. But this standard is voluntary, that is, you can choose not to comply or to comply.

Correspondingly, in the 8W-25WAC-DCLED lighting application, we consider two cases, one is that the application has no power factor requirement, that is, no PFC controller is required, and the other is that the PFC controller is required. In applications that do not require PFC, we assume that the input voltage specification is 90~132Vac or 180~264Vac (or universal input), the energy efficiency is 85%, and it provides protection features such as short circuit protection and open circuit protection, and the output current is 350mA, 700mA and 1A For constant current, correspondingly, NCP1028 or NCP1351 from ON Semiconductor can be used. Among them, the NCP1028 is an enhanced monolithic switching regulator suitable for providing output power from several watts to 15W in applications with universal mains input. The on-resistance of the NCP1028 is lower than that of the NCP101x, and it provides 800mA peak current. It has many of the features of the NCP101x, but also provides features such as over-power protection, built-in slope compensation, and input under-voltage protection. The NCP1351 is a fixed-on-time, variable-off-time pulse-width modulation (PWM) controller for cost-critical, low-power offline flyback switching power supply applications. The device supports frequency reversal, latch-up input, natural frequency jitter, negative current sensing, and extended supply voltage range. Figure 4 shows an NCP1351-based 8W-25W LED lighting scheme at 90 to 264Vac input.

LED lighting driver solutions with different power supplies and power levels

Figure 4: Schematic of the NCP1351-based 8 W to 25 W AC-DC LED lighting application circuit.

In the 8W-25WAC-DCLED lighting application that requires PFC, the input voltage specification is assumed to be 90 to 264Vac, the power factor is higher than 0.9, the energy efficiency is up to 80%, the short circuit and overpower protection is provided, and the output current is also different from 350mA, 700mA and 1A. choose. In such applications, ON Semiconductor’s NCP1607 or NCP1608PFC controllers can be used. The NCP1607 is a cost-effective critical conduction mode (CrM) PFC controller. This device is fully compatible with industry standard pins, simplifying the engineer’s design. Features such as adjustable overvoltage protection (OVP) and open loop protection also enhance design flexibility and robustness. Figure 5 shows an LED lighting application for the NCP1607/NCP1608 at 85 to 135Vac or 185 to 264Vac input.

LED lighting driver solutions with different power supplies and power levels

Figure 5: Schematic diagram of 8 W-25 W AC-DC LED lighting application based on NCP1607/8 PFC controller

3).AC-DC LED lighting applications with power higher than 50W

In AC-DC LED applications with a power of 50W to 300W, which are widely used in street lighting and high-power area lighting applications, different LED driving schemes can be used, assuming that the input voltage specification is 90 to 264Vac, the power factor is higher than 0.95, and the energy efficiency is 90 %.

Such applications can adopt the following different schemes, suitable for different application requirements:

NCP1652: Improved Single-Segment PFC

NCP1607/8+NCP1377: Critical Conduction Mode PFC + Quasi-Resonant Current Mode PWM

NCP1607/8+NCP1396: Critical Conduction Mode PFC+Half-Bridge Resonant LLC

NCP1901: The latest two-stage type (PFC + higher efficiency half-bridge resonant LLC)

For example, in 50W-150W AC-DCLED applications, either an improved single-stage PFC controller such as NCP1652 can be used, or a combination of NCP1607/8PFC controller and NCP1377 quasi-resonant (QR) mode PWM controller can be used. Among them, the NCP1377 combines a true current-mode modulator and a demagnetization detector to ensure full CrM operation under any load/line condition and lowest leakage voltage switching (quasi-resonant operation). The NCP1652 drives signals with programmable dead time, supports active clamp or synchronous rectification, and provides optimized energy efficiency. This device also has protection features such as input undervoltage protection, overvoltage protection, and overcurrent protection, and supports frequency jitter, period skipping, and critical conduction mode (CrM)/discontinuous conduction mode (DCM) operation. A schematic diagram of the 50W-150WAC-DCLED scheme based on the NCP1652 with 85 to 135Vac or 185 to 264Vac input is shown in Figure 6.

LED lighting driver solutions with different power supplies and power levels

Figure 6: 50 W-150 W AC-DC LED scheme based on NCP1652 single-segment PFC controller.

For AC-DC LED lighting applications with power above 50W, if a more energy-efficient LED power supply is required, a high-efficiency LED lighting topology is required, which often shifts from a flyback topology to a resonant half-bridge topology to give full play to zero-voltage switching (ZVS). ) technical advantages. Both NCP1396 and NCP1901 are high-efficiency half-bridge resonance solutions for LED power supplies developed by ON Semiconductor. Figure 7 shows the latest PFC+ resonant half-bridge LED driver solution based on NCP1901, the input voltage is 90 to 264Vac, the power is 100W to 300W, and the half-bridge section operates at a fixed frequency and a fixed duty cycle to reduce switching losses.

LED lighting driver solutions with different power supplies and power levels

Figure 7: 100W-300W AC-DC LED lighting scheme based on NCP1901

2. DC-DCLED lighting solution

In LED lighting applications powered by DC-DC power, common specific applications include 1W-3WMR11/MR16 step-down LED bulbs, 1W-20W boost LED drivers and 20W-60W high-power LED drivers.

Among them, in the 1W-3WDC-DC LED lighting application, ON Semiconductor’s CAT4201 step-down LED driver can be used. This device is compatible with 12V and 24V systems, provides LED driving current up to 350mA, and can drive 7 LEDs in a 24V system. LEDs in series, the energy efficiency is as high as 94%. The device uses a patented switching control architecture to help reduce system cost, support CrM operation and improve energy efficiency. The CAT4201 also provides comprehensive protection features such as current limiting, thermal protection and LED open circuit protection. The circuit diagram of this device in the 1W-3WDC-DCLED application is shown in Figure 8.

LED lighting driver solutions with different power supplies and power levels

Figure 8: 1 W-3 W DC-DC LED scheme based on CAT4201.

In the DC-DC boost LED application with a power range of 1W-20W, ON Semiconductor’s NCP3065/6 or NCV3065/6 (automotive version) buck, boost, single-ended primary inductance converter (SEPIC) can be used ) and inverter multi-mode LED driver, and select the boost circuit mode among them. In addition, ON Semiconductor’s NCP1034 synchronous step-down PWM controller can be used in DC-DC step-down LED applications with a power range of 20W-60W.

3. LED flashlight drive solution

Flashlight DC-DC LED lighting solutions include boost type and buck type. The NCP1421 step-up DC-DC converter with true shutdown function can be used in the 1W-3W step-up DC-DC LED flashlight application, while the NCP1529 low-voltage buck converter can be used in the 1W-3W step-down LED flashlight application. The schematic diagram of the application is shown in Figure 9.

Figure 9: LED flashlight boost and buck scheme based on NCP1421 and NCP1529

 4. Summary

ON Semiconductor is the world’s leading supplier of high-performance, energy-efficient silicon solutions, providing LED lighting driver and PFC solutions covering the power range of 1 to hundreds of watts. Whether it is an LED lighting driver using an AC-DC power supply, a DC-DC power supply, or a battery used in an LED flashlight, ON Semiconductor can provide customers with the difference between low cost, high cost performance, high energy efficiency, or whether they need PFC. The required LED lighting driver scheme.

The Links:   LB104S01-TD01 NL128102BC28-01

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