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Optoelectronics/Displays??

Boost converters tout 1MHz switching frequency

Posted: 26 Dec 2011 ?? ?Print Version ?Bookmark and Share

Keywords:step-up converter? high brightness LED? low voltage?

ZMD AG (ZMDI) has released its step-up converter with integrated 35V power switch for high brightness LEDs. According to the company, the ZLED7015 is optimal for driving multiple white LEDs connected in series from a low voltage supply. The boost converter can also drive devices that require a constant voltage and the wide input voltage range of 6-30V supports applications with input voltage from multicell 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, noted ZMDI.

ZLED7015

The ZLED7015 can drive devices that require a constant voltage.

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, stated the company. The device can also drive 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, ZMDI said.

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 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 startup 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 from -40C to 85C. The device comes in a MSOP-10 package and is RoHS compliant. For 5,000 pieces, the ZLED7015 is priced at $0.46.





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