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Converter drives LEDs in low voltage apps

Posted: 04 Jul 2012 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? converter? ZSLS7025?

ZMD AG has expanded its LED driver family with the ZSLS7025 step-up boost converter for high-brightness LED lighting. It is well suited for many consumer, industrial and after-market automotive applications. The ZSLS7025 is optimal for driving multiple white LEDs connected in series from a low voltage supply.

The converter ZSLS7025 has an application input voltage range of 6V to 100V, which supports lighting products using multicell batteries or regulated 12V, 24V and 48V power rails. A low-voltage feedback mechanism helps maximize the operating efficiency, and the open-circuit detection protects the application circuit. The output current is programmable via external components, and the ZSLS7025 features pulse-width modulation (PWM), linear and DC voltage dimming. With an adjustable overvoltage protection, the chip and the system operate safely even if the load is not connected. Other features include undervoltage protection and overtemperature protection, and an inherently stable control scheme that requires no additional loop compenzation.

The low supply voltage and constant output current operation make the ZSLS7025 suitable for safety extra-low voltage (SELV) applications or 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, after-market automotive lighting products, low-voltage general-purpose industrial and consumer applications, as well as signage, outdoor, architectural and building lighting.

The RoHS-compliant ZSLS7025 claims up to 95 percent efficiency, operates from -40C to +85C in a SOP-8 package. Samples and a complete evaluation kit are available upon request. For 2,500 pieces, the ZSLS7025 is priced at $0.80.

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