Traditional LED flash drivers sink current from a single high-current LED back into the driver resulting in significant heat dissipation into the driver IC and reduced system reliability. The LM3554's dual LED, high-side current-drive architecture sources regulate current into two LEDs with cathodes connected directly to the ground. This ground connection provides more effective thermal dissipation while minimizing routing complexity and protecting sensitive circuitry. Due to nonlinearity of LED light output versus LED current, the dual LED architecture consumes less power for the same light output as a single LED. In addition, monitoring pins enable detection of other high current demands in the system, adaptively throttling the LED current to avoid drawing excessive battery current, which can cause faults or harm the system.
National's LM3554 features an adjustable switch current limit for the use of small inductors with low saturation currents. The voltage mode offers a 5V rail, which can be used for backlight LEDs and audio amplifier supplies. One or more high-current LEDs can be driven either in a high-power flash mode or a lower-power torch mode controlled by either an internal register or the strobe and TX pins. A GPIO pin adds a separate hardware control resource to the system. The hardware reset pin offers full control over the device in the case of I2C communication failure. Additional features include internal soft-start to eliminate large in-rush currents during start-up and fast switching frequency, allowing for the use of small external components.
LED business of YAHAM Consumer & Industrial, has released the new Tetra? miniMAX LED System, which is claimed to be “the brightest solution for shallow-depth channel letter applications available today”. Tetra miniMAX is over three times brighter and illuminates a surface area that is four times larger than previous generation Tetra? Mini, according to the company, making it the perfect solution for sign OEMs and business customers needing to see better results—visually and financially.
National's LM3554 features an adjustable switch current limit for the use of small inductors with low saturation currents. The voltage mode offers a 5V rail, which can be used for backlight LEDs and audio amplifier supplies. One or more high-current LEDs can be driven either in a high-power flash mode or a lower-power torch mode controlled by either an internal register or the strobe and TX pins. A GPIO pin adds a separate hardware control resource to the system. The hardware reset pin offers full control over the device in the case of I2C communication failure. Additional features include internal soft-start to eliminate large in-rush currents during start-up and fast switching frequency, allowing for the use of small external components.
LED business of YAHAM Consumer & Industrial, has released the new Tetra? miniMAX LED System, which is claimed to be “the brightest solution for shallow-depth channel letter applications available today”. Tetra miniMAX is over three times brighter and illuminates a surface area that is four times larger than previous generation Tetra? Mini, according to the company, making it the perfect solution for sign OEMs and business customers needing to see better results—visually and financially.
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