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

Wed, 12/21/2011 - 11:13am
ZLED7015Dresden, Germany - December 21, 2011 - ZMD AG is introducing its first step-up converter with integrated 35 V power switch for high brightness LEDs. It is optimal for driving multiple white LEDs connected in series from a low voltage supply. The ZLED7015 can also drive devices that require a constant voltage and the wide input voltage range of 6V to 30V supports applications with input voltage from multi-cell batteries or regulated 12V and 24V power rails. 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 24V 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 step up topology of the ZLED7015 enables applications using multiple high brightness LEDs strings while being driven from a low voltage source“, stated Andy Smith, Product Manager at ZMDI. “This is particularly attractive for designers of low voltage high brightness lighting products. Other benefits include simplified manufacturing, lower cost, higher efficiency and greater reliability."

The ZLED7015 is ideal for customers using 6-30V 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 1MHz allowing the use of smaller, less expensive external components. A low 0.3V 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 significantly 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°C to 85°C. Samples and a complete evaluation kit are available now. The ZLED7015 comes in a MSOP-10 package and is RoHS compliant. For 5,000 pieces, the ZLED7015 is priced at €0.35/$0.46.

ZLED7015 product data sheet URL: www.zmdi.com/products/led-drivers/zled7015
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