HV9971 Product Summary Sheet Isolated, Constant Current LED Driver IO Applications: VIN ►► Low Power Lighting Fixtures RIN 2 4 PWMD VIN BIAS HV9971 GATE 6 GND CS VD VDD 3 8 RD RBIAS 1 RSN 7 CSN 5 RS RDD CDD Typical Application Circuit 8-Lead SOIC (LG) Product Overview: The HV9971 is a primary-side control IC for driving a discontinuous conduction mode (DCM) flyback LED driver. The IC is optimized for operation at a constant full-load switching frequency of 100kHz and the universal input AC voltage range of 80-264VAC. It maintains 3% variation of the LED current setting, and features tight line and load regulation. The proprietary primary-side output current control employed in the HV9971 makes the output current setting insensitive to most component tolerances and parasitics without use of an opto-feedback. The HV9971 LED driver is fully protected against output open and short circuit conditions and input under-voltage. It also offers a logic input for dimming the LED light output by means of pulse-width modulation of the output current. The HV9971 is ideally suited for driving high-brightness LEDs in low-power lighting fixtures such as incandescent bulb retrofits. 030211 Features: Benefits: Isolated solution Complies with UL requirements; easy design Primary side current sensing No optocoupler required; reduced circuit cost and size Universal 80-264VAC input Versatile, one design for worldwide use PWM dimming Simple controls to adjust LED brightness Supertex inc. HV9971 Isolated, Constant Current LED Driver Ordering Information / Availability Part Number Package Option Samples Lead Time HV9971LG-G 8-Lead SOIC (Green) Now 4-6 Weeks ARO -G indicates the part is RoHS compliant (Green). Product Contact For any questions regarding the HV9971, please contact your local area Supertex sales office, or contact the main office in the US at: Telephone:800-222-8888 Fax:408-222-4895 EMail:[email protected] Website: www.supertex.com Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089