product summary sheet typical application circuit features: benefts: 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 product overview: the hv9971 is a primary-side control ic for driving a discontinuous conduction mode (dcm) fyback 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 fxtures such as incandescent bulb retrofts. applications: ? low power lighting fixtures hv9971 isolated, constant current led driver 030211 8-lead soic (lg) i o v in r s hv9971 vi n bias gate cs vd d gn d pw md c dd r in r bias vd r d r dd 2 1 5 7 4 6 3 8 r sn c sn supertex inc.
1235 bordeaux drive, sunnyvale, ca 94089 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). hv9971 isolated, constant current led driver product contact for any questions regarding the hv9971, please contact your local area supertex sales offce, or contact the main offce in the us at: telephone: 800-222-8888 fax: 408-222-4895 email: mktg@supertex.com website: www.supertex.com supertex inc.
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