Thursday, April 25, 2024

Latest LED Driver IC Facilitates Designing Of Low Current LED Strips

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  • Enables flexibility in lighting applications and improves overall efficiency
  • Includes a smart over-temperature controlling circuit for keeping the current constant at rising temperature

Infineon Technologies has released a constant current linear LED IC, the BCR431U. It provides low-voltage drop performance for regulating LED current. It is the second device released in the new generation BCR family with low voltage drop focusing on low current designs of up to 37 mA. Typical applications for the new IC 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. This enables far more flexibility in lighting applications. It also improves the overall efficiency and provides the voltage headroom required to compensate for the LED forward voltage tolerances and variances in the supply voltage.

Provides ease of customising LED lights

The BRCU431U allows any number of additional LEDs to be added 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 7 m. Overall, longer LED strips mean fewer feeding points and fewer efforts in installation.

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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 per cent, which makes it attractive for a great variety of LED strip designs.

The BCR431U can be ordered now in a SOT-23-6 package. In addition, a demo board is available.


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