National Semiconductor Corporation (NYSE: NSM) announced a new LED driver with temperature management control and an online design support tool. The LM3424 LED driver is a new addition to National's PowerWise family of energy-efficient chips that can drive high-brightness LEDs for a wide range of indoor/outdoor lighting systems and automotive lighting applications. In addition to the design hardware and tool support of National Semiconductor WEBENCHLED Designer, the LM3424 chip also has a temperature management control function called thermal energy folding. System designers can quickly and easily design a stable and reliable thermal monitoring system with this chip.
Due to the actual operating environment, the internal temperature of the LED may rise to a very high level. However, the thermal energy folding circuit can monitor the thermal energy of the system to avoid temperature loss. If the temperature of the LED rises above the threshold and enters the non-safe area, the life and lighting effects of the LED will be affected. However, engineers can use the LM3424 chip to set the temperature and slope breakpoints for the LEDs of the lighting system to ensure that the LEDs stay in the safe zone. In the event of overheating, the thermal foldback circuit of the LM3424 chip reduces the regulated current flowing into the LED. The reduced rectification current will also reduce the brightness of the LED, but remain within the engineer's preset range until the operating temperature returns to a safe operating range.
This thermal energy foldback design provides a reliable guarantee for the life and lighting of LEDs, ensuring that lighting fixtures such as headlights, high ceiling warehouse lights and street lights can operate normally during the warranty period.
Engineers who design lighting systems can use National's WEBENCH LEDDesigner design tool to accurately calculate the ideal temperature threshold or breakpoint breakpoint for an LED. The resistance values ​​used to determine the temperature breakback breakpoint have been calculated manually. Engineers can easily enter the temperature breakpoint and slope breakpoint values ​​using the WEBENCH online design tool, and then view the different performance of the system design at different LED temperatures on the screen. The whole process does not require manual calculation. The interactive temperature slider graphically displays the system's performance at different temperatures. And the system design using this LED driver will automatically update based on the input temperature breakpoint.
National Semiconductor LM3424 LED Driver Specifications
The LM3424 is available in a more thermally-cooled 20-pin TSSOP package that can drive up to 18 high-brightness LEDs in series, delivering up to 2A of drive current for typical applications. The chip provides regulated current for a wide range of applications including buck, boost, SEPIC, flyback and buck/buck topologies.
The LM3424 is suitable for a wide input voltage range of 4.5V to 75V, and the built-in Pulse Width Modulation (PWM) controller supports high speed operation. For example, the product can support synchronous oscillators up to 2.0MHz. In addition, the chip's features include PWM dimming and analog dimming, programmable soft-start, and a variety of different protection features such as low power, thermal shutdown, and weekly term flow.
Price and availability
National's LM3424 chip is available in volume and is priced at $1.75 each in 1,000-unit quantities.
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Due to the actual operating environment, the internal temperature of the LED may rise to a very high level. However, the thermal energy folding circuit can monitor the thermal energy of the system to avoid temperature loss. If the temperature of the LED rises above the threshold and enters the non-safe area, the life and lighting effects of the LED will be affected. However, engineers can use the LM3424 chip to set the temperature and slope breakpoints for the LEDs of the lighting system to ensure that the LEDs stay in the safe zone. In the event of overheating, the thermal foldback circuit of the LM3424 chip reduces the regulated current flowing into the LED. The reduced rectification current will also reduce the brightness of the LED, but remain within the engineer's preset range until the operating temperature returns to a safe operating range.
This thermal energy foldback design provides a reliable guarantee for the life and lighting of LEDs, ensuring that lighting fixtures such as headlights, high ceiling warehouse lights and street lights can operate normally during the warranty period.
Engineers who design lighting systems can use National's WEBENCH LEDDesigner design tool to accurately calculate the ideal temperature threshold or breakpoint breakpoint for an LED. The resistance values ​​used to determine the temperature breakback breakpoint have been calculated manually. Engineers can easily enter the temperature breakpoint and slope breakpoint values ​​using the WEBENCH online design tool, and then view the different performance of the system design at different LED temperatures on the screen. The whole process does not require manual calculation. The interactive temperature slider graphically displays the system's performance at different temperatures. And the system design using this LED driver will automatically update based on the input temperature breakpoint.
National Semiconductor LM3424 LED Driver Specifications
The LM3424 is available in a more thermally-cooled 20-pin TSSOP package that can drive up to 18 high-brightness LEDs in series, delivering up to 2A of drive current for typical applications. The chip provides regulated current for a wide range of applications including buck, boost, SEPIC, flyback and buck/buck topologies.
The LM3424 is suitable for a wide input voltage range of 4.5V to 75V, and the built-in Pulse Width Modulation (PWM) controller supports high speed operation. For example, the product can support synchronous oscillators up to 2.0MHz. In addition, the chip's features include PWM dimming and analog dimming, programmable soft-start, and a variety of different protection features such as low power, thermal shutdown, and weekly term flow.
Price and availability
National's LM3424 chip is available in volume and is priced at $1.75 each in 1,000-unit quantities.
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