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Infineon launches LED driver IC

Infineon Technologies has released the BCR431U, a constant current linear LED driver IC that is able to provide low-voltage drop performance for regulating LED current

It is the second device released in the BCR family with low voltage drop focusing on low current designs of up to 37 mA. Typical applications for the new BCR431U include LED strips, channel letters, architectural LED lighting, LED displays, as well as emergency, retail, and appliance lighting.

The voltage drop at the integrated driver IC can go down to 105 mV at 15 mA providing more flexibility in lighting applications. It improves the overall efficiency and provides the voltage headroom required to compensate for the LED forward voltage tolerances and variances in the supply voltage.

The BRCU431U allows the user to either add additional LEDs to lighting designs, for example, seven instead of six LEDs in series driven by one IC. Or it can be used to increase the overall length of a LED strip design from, for example, 5 to 7m. Overall, longer LED strips mean fewer feeding points and less efforts in installation.

The LED current is easily adjustable via a high ohmic resistor on a dedicated pin with an IC supply voltage ranging between 6 V and 42 V. For safe and reliable operation and to extend the overall LED system’s lifetime, a smart over-temperature controlling circuit keeps the current constant even at rising temperature. At the same time, it reduces the LED current only when the junction temperature gets very high.

The BCR431U features a dimming capability of down to 1 percent, which makes it attractive for a great variety of LED strip designs

Author
Neil Tyler

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