ZMDI rolls high-efficiency boost LED driver for HB LEDs

July 03, 2012 // By Christoph Hammerschmidt
ZMD AG expanded the lineup of its LED drivers with the addition of the ZSLS7025, a step-up 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 ZSLS7025 has an application input voltage range of 6V to 100V, which supports lighting products using multi-cell batteries or regulated 12V, 24V and 48V power rails. A low-voltage feedback mechanism helps maximize 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 over-voltage protection, the chip and the system operate safely even if the load is not connected. Other features include under-voltage protection and over-temperature protection.

The ZSLS7025 is ZMDI's second boost converter and complements the advantages of the ZLED7015 by increasing the operating voltage range and the output current capability. The step-up topology of the ZSLS7025 enables applications using strings of multiple high-brightness LEDs while being driven from low-voltage sources, ZMDI says. This feature set makes the device particularly attractive for designers of low-voltage high-brightness lighting products.

The low supply voltage and constant output current operation make the ZSLS7025 an ideal choice 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 ZSLS7025 is supplied in a RoHS-compliant SOP-8 package. Operating temperature range is -40degree(s)C to +85degree(s)C (-40degree(s)F to +185degree(s)F). Samples and a complete evaluation kit are available upon request. For 2,500 pieces, the ZSLS7025 is priced at EUR0.62/$0.80.