ZD810 Univeral High Brightness LED Driver Zywyn Features • • • • • • • • • Universal High Brightness LED Driver General Description Low cost and high-efficiency LED driver Form and fit compatible with market solutions Open loop peak current controller Internal 8.0 to 450V linear regulator Constant frequency / constant off-time operation 0- 250 mV linear dimming 0 - 100% PWM dimming Requires few external components 8-Lead NSOIC Green Package Applications • • • • • • • ZD810 AC/DC and DC/DC LED driver applications Lighting, recessed lighting, street lighting Signage and decorative lighting RGB backlighting, flat panel backlighting LED control powered by the Mains General purpose constant current source Chargers The ZD810 is a dimmable current-mode constant current LED driver IC. It drives an external MOSFET to accurately regulate the current in the LED string. The MOSFET can be sized for all types of LEDs including Power and HB LEDs beyond 1W. Its robust 450V rating makes it universally applicable to systems powered directly from Mains sources or from popular PFC sources. Its low voltage rating of 8V makes is suitable as well for low/medium voltage sources. The internal linear regulator generates 7.5V at the Vdd pin, which is also made available for external use, thus saving the cost of an external regulator. Current dimming can be achieved through the 0 - 250mV linear dimming on Pin LD, or else by PWM methods on the PWMD pin with a duty cycle ratio of 0 - 100% and a frequency of up to a few kHz. The ZD810 is ideally suited for buck topology based LED drivers. Since it operates in open loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. The ZD810 is an ideal and affordable driver for low cost LED string control solutions, requiring only three external components (apart from the power MOSFET). Ordering Information Part Number Temperature Range ZD810LEN Pin Configuration Package Type –40°C to +85°C ZD810NEVB 8-Pin nSOIC n/a For 8-Pin nSOIC Please contact the factory for pricing and availabiliy on Tape-on-Reel option. 8 ROSC VIN 1 CS 2 Zywyn 7 LD GND 3 ZD810 6 VDD GATE 4 5 PWMD Typical Application VIN CIN COUT D1 8-Pin nSOIC VIN VDD LD CDD W ZD810 GATE L PWMD PWMD L1 M1 CS ROSC GND ROSC RCS Figure 1. ZD810 Typical Application Zywyn Specifications subject to change without notice 1 • Email [email protected] • www.zywyn.com Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 June 2010 rev. 1.1