Boost converter drives multiple high brightness LEDs in low-voltage lighting applications

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By eeNews Europe

A low voltage feedback mechanism helps maximize the operating efficiency and the device’s soft-start function and open circuit detection protects the application circuit and extends the LED life.

The low voltage, constant current operation makes the ZLED7015 an ideal choice for safety extra-low voltage (SELV) applications with less than 24 V in damp environments. The device is also an ideal driver for multifaceted reflector (MR16) lamps, frequently found in residential and retail lighting applications. Other key application areas include low voltage retrofit lighting, replacement tubes, LED backlighting, aftermarket automotive lighting products, low voltage general purpose industrial and consumer applications, as well as signage, outdoor, architectural and building lighting.
The ZLED7015 is ideal for customers using 6-30 V supply to drive multiple high brightness LEDs. The device includes an integrated power switch to minimize system cost and reduce component count for size-optimized applications. The output current is programmable via external components and features PWM, Linear and DC voltage dimming.

The ZLED7015 operates with a switching frequency of 1 MHz allowing the use of smaller, less expensive external components. A low 0.3 V feedback voltage minimizes power loss in the current setting resistor for better efficiency. With an adjustable over voltage protection, the chip and the system operates safely even if the load is not connected or the output is short circuited.

A built-in soft start circuit reduces the inrush current during start-up and extends the LEDs lifetime. Further features include an under voltage protection as well as an over temperature protection.

The operating temperature range of the ZLED7015 is -40 to 85°C. Samples and a complete evaluation kit are available.

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