With its advantages of energy saving, long service life and rich color combination, LED has become one of the fastest growing semiconductor fields. In recent years, its compound annual growth rate (CAGR) is as high as 20%. It is expected that the global LED market will be even more in 2012. The amount is 11.4 billion US dollars, and the prospects are very impressive.
Typical LED drivers on the market include two types, linear drivers and switch drivers; and further subdivided, there are three types, switching regulators, linear regulators, and resistive drivers. These three drivers are suitable for different levels of current applications, see Figure 1. For high current applications with currents greater than 500mA, switching regulators are used, because linear actuators are limited to their own structure and cannot provide such large currents; Linear regulators and resistive drivers are typically used in low current applications of 200 mA, and linear regulators or switching regulators can be used in medium current applications from 200 to 500 mA.
Switching regulators are energy efficient and offer excellent brightness control. The linear regulator structure is simple, easy to design, provides constant current and overcurrent protection, has an external current set point, and has no electromagnetic compatibility (EMC) issues. Resistive drivers use a simple discrete device such as a resistor to limit the LED string current. This is an economical LED Driver solution that is equally easy to design and has no EMC issues.
As the world's leading supplier of high performance, energy efficient silicon solutions, ON Semiconductor offers a wide selection of switching regulators and linear regulators for different LED applications. At the same time, customers on the market also need a driver that is more economical than switching regulators and common linear regulators, but much more powerful than resistive drivers. Under this circumstance, ON Semiconductor has adopted a patent-pending self-biasing transistor (SBT) technology, combined with its own superior process control capability, to introduce a new LED driver solution. D?D discrete linear constant current stability The voltage regulator (CCR) fills this market gap and further enriches ON Semiconductor's broad lineup of LED driver products.
Low current LED application and driver comparison
The new linear constant current regulators are suitable for low current LED applications from 20 mA to 200 mA. As in automotive applications, the current requirements for combined taillights are typically only tens of milliamps (mA). In addition, in commercial and industrial applications such as billboard text circuits and backlit display cards, the input voltage is typically as high as 30 Vdc and the LED current is between 20 mA and 150 mA. In buildings such as decorative lighting, work lights, landscape lighting, counter lighting, and general lighting applications, the input voltage is typically 12 to 48 Vac or 120/220 Vac, and the LED current is only between 20 and 100 mA. In addition, household appliances such as refrigerators and washing machines also use LEDs for small LCD screen backlights or alternative lighting bulbs. Such applications also require low current LED drivers.
In low-current LED applications, the resistive driver, although low in cost and simple in structure, has a low forward current under low voltage conditions, which causes LED brightness to be insufficient and under transient conditions such as load dump. The LED may be damaged. Moreover, this solution requires proper LED coding, large resistance inventory, and low energy efficiency.
Compared to resistive drivers, linear constant current regulators provide regulated current, provide constant brightness over a wide voltage range, protect LEDs from overdrive at high input voltages, and provide higher output at low input voltages. brightness. Thanks to its constant current characteristics, customers can reduce or eliminate the coding costs of different LEDs from different suppliers, resulting in lower total system cost.
We can verify the performance comparison of the two drivers through actual tests. See Figure 3. The test compares the combined taillights with the two drivers. The CCR is a device with a stable current of 25mA. As can be seen from the figure, at the same input voltage of 9 V, the CCR has a higher current than the resistive driver, making the LED brighter. When the same voltage is input at 13V, the brightness is the same. After the voltage is higher than 13 V, the current of the CCR gradually flows to 25 mA, while the current of the resistive driver rises, which may cause the LED to overdrive and damage the LED. In addition, the CCR provides a current accuracy of ±10%, which is fully satisfied. Application requirements, and the current accuracy of the resistive type is only ±50%, which is quite different.
Simple, economical and robust linear constant current regulator based on patented SBT technology
ON Semiconductor's linear constant current regulators are based on ON Semiconductor's patented self-biased transistor (SBT) technology, which provides a degree of integration and combines ON Semiconductor's superior process control capabilities for low currents. Applications provide simple, economical and Robust LED drive solutions.
In particular, the device's dual-ended is very easy to design, suitable for high-side and low-side applications, and requires no external components, very simple. Its economy is mainly reflected in eliminating LED coding, reducing inventory costs, and protecting LEDs, reducing replacement and maintenance costs. ON Semiconductor also plans to introduce a linear constant current regulator with three-terminal adjustable output. Their structure is shown in Table 1.
It is worth mentioning that ON Semiconductor's linear constant current regulator supports 120/220Vac Power Supply. For buildings and general lighting applications, 120/220Vac AC mains input is only required to ensure input after bridge rectification. The voltage remaining after subtracting the total voltage of the LED string does not exceed the maximum anode-cathode voltage VAK of the linear constant current regulator 45V. This also reflects its easy-to-design features.
In terms of ruggedness, ON Semiconductor's series of devices are very outstanding. For example, it is designed with a negative temperature coefficient (NTC) to protect the LED from thermal runaway at extreme voltages and operating temperatures. For example, the device size of the SOT-223 surface mount package is 7.0mm x 6.5 mm x 1.6 mm, which dissipates 630mW on a 500mm long/less than 29g copper plate at 85°C. Suitable for extreme hot work environments. In addition, these devices are certified to the rigorous AEC101 automotive standard for demanding automotive applications. These devices also withstand switching transients and voltage spikes and have a good electrostatic discharge (ESD) rated pulse rating of 1.8kV. In addition, these devices support environmental protection, use halogen-free mold compounds, and comply with lead-free RoHS directives. Claim.
ON Semiconductor's first NSI45 series of 10 dual-ended linear constant current regulators were introduced in May 2009. These devices offer ±10% and ±15% steady-state steady current (Ireg) tolerances at 45V. Operating temperature range -40°C to 85°C, maximum junction temperature of 150°C, available in 20 mA, 25 mA and 30 mA devices, in SOD-123 and SOT223 packages, target market including internal and external LEDs for automotive applications Lighting, commercial logo applications, xenon lamp replacement, traffic signals, and display backlighting, flat panel AC lighting, work and decorative lights, landscape and outdoor lighting in buildings and general lighting applications.
Table 1 lists the main parameters of ON Semiconductor's NSI450 series linear constant current regulators, including dual-ended devices such as the NSI450XXT1G (SOT123 package, 20/25/30mA), NSI450XXZT1G (SOT223 package, 25/30mA). Available in existing samples and in volume production; also available in three-terminal devices such as the NSI450XXZT1G (SOT223 package, 30 to 80mA adjustable) and NSI450XXT1G (D-PAK package, 80 to 150mA adjustable), will be available in the third quarter of 2009 Samples were provided and mass production was carried out in the fourth quarter.
to sum up:
As the world's leading provider of high-performance, energy-efficient silicon solutions, ON Semiconductor's operational excellence delivers more than 32 billion devices per year across manufacturing facilities around the world, with advanced process and technology capabilities. ON Semiconductor is also familiar with its customers, has established extensive and in-depth relationships with a wide range of international and local customer customers, and serves customers with design support centers around the world. ON Semiconductor's broad portfolio of products and solutions spans standard products, proprietary solutions, proprietary standard products and custom ASIC solutions, as well as automotive, computer and game consoles, portable consumer products, media and entertainment, industrial, medical High-voltage communications, military and aerospace applications
All of the above applications in ON Semiconductor's services involve LED lighting/backlighting. And ON Semiconductor uses a wide range of technologies to provide solutions for a wide range of LED lighting applications, leveraging the core strengths of energy efficient power solutions. ON Semiconductor's new simple, economical and rugged linear constant current regulator solution for low current LED lighting applications broadens ON Semiconductor's existing LED drivers including switching regulators and common linear regulators The product lineup is ideal for automotive interior/external lighting, commercial signage and building LED lighting applications.
Figure 2: CCR combines with a resistive driver and a linear regulator to fill the gap in the market.
Figure 3: Comparison of the VI curve of a resistive driver with a linear constant current regulator with a regulated current of 25 mA.
Table 1: The two-terminal and three-terminal linear constant current regulators that ON Semiconductor has introduced and planned.
Typical LED drivers on the market include two types, linear drivers and switch drivers; and further subdivided, there are three types, switching regulators, linear regulators, and resistive drivers. These three drivers are suitable for different levels of current applications, see Figure 1. For high current applications with currents greater than 500mA, switching regulators are used, because linear actuators are limited to their own structure and cannot provide such large currents; Linear regulators and resistive drivers are typically used in low current applications of 200 mA, and linear regulators or switching regulators can be used in medium current applications from 200 to 500 mA.
Switching regulators are energy efficient and offer excellent brightness control. The linear regulator structure is simple, easy to design, provides constant current and overcurrent protection, has an external current set point, and has no electromagnetic compatibility (EMC) issues. Resistive drivers use a simple discrete device such as a resistor to limit the LED string current. This is an economical LED Driver solution that is equally easy to design and has no EMC issues.
As the world's leading supplier of high performance, energy efficient silicon solutions, ON Semiconductor offers a wide selection of switching regulators and linear regulators for different LED applications. At the same time, customers on the market also need a driver that is more economical than switching regulators and common linear regulators, but much more powerful than resistive drivers. Under this circumstance, ON Semiconductor has adopted a patent-pending self-biasing transistor (SBT) technology, combined with its own superior process control capability, to introduce a new LED driver solution. D?D discrete linear constant current stability The voltage regulator (CCR) fills this market gap and further enriches ON Semiconductor's broad lineup of LED driver products.
Low current LED application and driver comparison
The new linear constant current regulators are suitable for low current LED applications from 20 mA to 200 mA. As in automotive applications, the current requirements for combined taillights are typically only tens of milliamps (mA). In addition, in commercial and industrial applications such as billboard text circuits and backlit display cards, the input voltage is typically as high as 30 Vdc and the LED current is between 20 mA and 150 mA. In buildings such as decorative lighting, work lights, landscape lighting, counter lighting, and general lighting applications, the input voltage is typically 12 to 48 Vac or 120/220 Vac, and the LED current is only between 20 and 100 mA. In addition, household appliances such as refrigerators and washing machines also use LEDs for small LCD screen backlights or alternative lighting bulbs. Such applications also require low current LED drivers.
In low-current LED applications, the resistive driver, although low in cost and simple in structure, has a low forward current under low voltage conditions, which causes LED brightness to be insufficient and under transient conditions such as load dump. The LED may be damaged. Moreover, this solution requires proper LED coding, large resistance inventory, and low energy efficiency.
Compared to resistive drivers, linear constant current regulators provide regulated current, provide constant brightness over a wide voltage range, protect LEDs from overdrive at high input voltages, and provide higher output at low input voltages. brightness. Thanks to its constant current characteristics, customers can reduce or eliminate the coding costs of different LEDs from different suppliers, resulting in lower total system cost.
We can verify the performance comparison of the two drivers through actual tests. See Figure 3. The test compares the combined taillights with the two drivers. The CCR is a device with a stable current of 25mA. As can be seen from the figure, at the same input voltage of 9 V, the CCR has a higher current than the resistive driver, making the LED brighter. When the same voltage is input at 13V, the brightness is the same. After the voltage is higher than 13 V, the current of the CCR gradually flows to 25 mA, while the current of the resistive driver rises, which may cause the LED to overdrive and damage the LED. In addition, the CCR provides a current accuracy of ±10%, which is fully satisfied. Application requirements, and the current accuracy of the resistive type is only ±50%, which is quite different.
Simple, economical and robust linear constant current regulator based on patented SBT technology
ON Semiconductor's linear constant current regulators are based on ON Semiconductor's patented self-biased transistor (SBT) technology, which provides a degree of integration and combines ON Semiconductor's superior process control capabilities for low currents. Applications provide simple, economical and Robust LED drive solutions.
In particular, the device's dual-ended is very easy to design, suitable for high-side and low-side applications, and requires no external components, very simple. Its economy is mainly reflected in eliminating LED coding, reducing inventory costs, and protecting LEDs, reducing replacement and maintenance costs. ON Semiconductor also plans to introduce a linear constant current regulator with three-terminal adjustable output. Their structure is shown in Table 1.
It is worth mentioning that ON Semiconductor's linear constant current regulator supports 120/220Vac Power Supply. For buildings and general lighting applications, 120/220Vac AC mains input is only required to ensure input after bridge rectification. The voltage remaining after subtracting the total voltage of the LED string does not exceed the maximum anode-cathode voltage VAK of the linear constant current regulator 45V. This also reflects its easy-to-design features.
In terms of ruggedness, ON Semiconductor's series of devices are very outstanding. For example, it is designed with a negative temperature coefficient (NTC) to protect the LED from thermal runaway at extreme voltages and operating temperatures. For example, the device size of the SOT-223 surface mount package is 7.0mm x 6.5 mm x 1.6 mm, which dissipates 630mW on a 500mm long/less than 29g copper plate at 85°C. Suitable for extreme hot work environments. In addition, these devices are certified to the rigorous AEC101 automotive standard for demanding automotive applications. These devices also withstand switching transients and voltage spikes and have a good electrostatic discharge (ESD) rated pulse rating of 1.8kV. In addition, these devices support environmental protection, use halogen-free mold compounds, and comply with lead-free RoHS directives. Claim.
ON Semiconductor's first NSI45 series of 10 dual-ended linear constant current regulators were introduced in May 2009. These devices offer ±10% and ±15% steady-state steady current (Ireg) tolerances at 45V. Operating temperature range -40°C to 85°C, maximum junction temperature of 150°C, available in 20 mA, 25 mA and 30 mA devices, in SOD-123 and SOT223 packages, target market including internal and external LEDs for automotive applications Lighting, commercial logo applications, xenon lamp replacement, traffic signals, and display backlighting, flat panel AC lighting, work and decorative lights, landscape and outdoor lighting in buildings and general lighting applications.
Table 1 lists the main parameters of ON Semiconductor's NSI450 series linear constant current regulators, including dual-ended devices such as the NSI450XXT1G (SOT123 package, 20/25/30mA), NSI450XXZT1G (SOT223 package, 25/30mA). Available in existing samples and in volume production; also available in three-terminal devices such as the NSI450XXZT1G (SOT223 package, 30 to 80mA adjustable) and NSI450XXT1G (D-PAK package, 80 to 150mA adjustable), will be available in the third quarter of 2009 Samples were provided and mass production was carried out in the fourth quarter.
to sum up:
As the world's leading provider of high-performance, energy-efficient silicon solutions, ON Semiconductor's operational excellence delivers more than 32 billion devices per year across manufacturing facilities around the world, with advanced process and technology capabilities. ON Semiconductor is also familiar with its customers, has established extensive and in-depth relationships with a wide range of international and local customer customers, and serves customers with design support centers around the world. ON Semiconductor's broad portfolio of products and solutions spans standard products, proprietary solutions, proprietary standard products and custom ASIC solutions, as well as automotive, computer and game consoles, portable consumer products, media and entertainment, industrial, medical High-voltage communications, military and aerospace applications
All of the above applications in ON Semiconductor's services involve LED lighting/backlighting. And ON Semiconductor uses a wide range of technologies to provide solutions for a wide range of LED lighting applications, leveraging the core strengths of energy efficient power solutions. ON Semiconductor's new simple, economical and rugged linear constant current regulator solution for low current LED lighting applications broadens ON Semiconductor's existing LED drivers including switching regulators and common linear regulators The product lineup is ideal for automotive interior/external lighting, commercial signage and building LED lighting applications.
Figure 2: CCR combines with a resistive driver and a linear regulator to fill the gap in the market.
Figure 3: Comparison of the VI curve of a resistive driver with a linear constant current regulator with a regulated current of 25 mA.
Table 1: The two-terminal and three-terminal linear constant current regulators that ON Semiconductor has introduced and planned.
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