NS launched a high brightness LED driver with temperature management control function

National Semiconductor Corporation Ns (National Semiconductor Corporation) announced the launch of a new temperature management control functions of the LED drive, and launched online design corresponding support tools. This model LM3424 LED drive is the national semiconductor PowerWise series high efficiency series chip? In a new product, it can drive high brightness LED, suitable for various indoor / outdoor lighting and automotive lighting applications. LM3424 chip in addition to access to the national semiconductor WEBENCH, LED Designer design tool support, but also has a thermal management of the temperature control function. System design engineers as long as the use of this chip, you can easily and quickly design a set of stable and reliable thermal monitoring system.

Affected by the actual operating environment, the internal temperature of LED may soar to a high level. However, the thermal circuit can monitor the system to control the heat energy, so as to prevent the temperature out of control. If the LED temperature rise threshold, into the non safe area, LED life and lighting effects will be affected. But engineers as long as the use of this LM3424 chip, you can set the temperature of the lighting system LED and slope breakpoints, to ensure that LED stay in the safe area of operation. If the overheating occurs, the LM3424 chip thermal circuit will be reduced back into the LED current regulator. The reduced current will decrease the brightness of the LED, but it will remain within the preset range of the Engineer until the operating temperature is restored to a safe operating range.

This design can provide a reliable guarantee for the life of the LED and the lighting effect, to ensure that the headlights, Gao Tianhua warehouse lights and street lamps and other lighting devices in the warranty period of normal operation.

Engineers in the design of lighting systems can use the national semiconductor WEBENCH LED Designer design tools to accurately calculate the LED's ideal temperature threshold or break point. All the time, to determine the temperature back to the point of resistance values are calculated by artificial. As long as the engineer online using WEBENCH design tools, can easily enter the numerical point and slope breakpoint temperature, and then view the different performance of system design at different LED temperatures on the screen, the whole process without manual calculation. Interactive temperature slider can graphically display the performance of the system at different temperatures. And the system design of the LED driver will be updated automatically according to the input temperature breakpoint.

Technical specification for national semiconductor LM3424 LED driver

The LM3424 chip using a more powerful 20 pin TSSOP package, can drive up to 18 series of high brightness LED, in typical applications, the output can be more than 2A drive current. This chip can provide voltage regulator for Buck, boost, SEPIC, flyback and buck / buck topology and other applications.

The LM3424 chip is suitable for a wide input voltage range from 4.5V to 75V, and the built-in pulse width modulation (PWM) controller can support high speed operation. For example, the product can support up to 2.0MHz frequency synchronization oscillator. In addition, the function of the chip also includes PWM dimming and analog dimming, programmable soft start and low power, thermal shutdown and a variety of different types of protection, such as the term flow.