G5345 Global Mixed-mode Technology Triac Dimmable Offline LED Driver Features General Description The G5345 is an adaptive constant off-time AC/DC buck controller for dimmable LED luminaries designed to be compatible with triac dimmers. The G5345 provides a constant current for illuminating high power LEDs and includes a triac dim decoder. The LED brightness is modulated by the scheme of PWM-dimming. The G5345 includes a bleeder circuit to ensure proper triac operation by allowing current flow while the line voltage is low to enable proper firing of the triac. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and input supply under-voltage lockout. Triac dim decoder circuit for LED dimming Application voltage range 80VAC – 277VAC Capable of controlling LED currents greater than 1A Low quiescent current Programmable off-time allows for constant ripple current Input supply under-voltage lockout Thermal shutdown Over current protection No visible flicker MSOP-8 package Applications Retro Fit Lamps Solid State Lighting LED modules such as LED spots, down-lights LED strings suitable for retail displays, etc. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5345P81U G5345 -40°C to +125°C MSOP-8 Note: P8: MSOP-8 1: Bonding Code U: Tape & Reel Pin Configuration G5345 VPP 1 8 VIN1 GATE 2 7 FLTR1 ISNS 3 6 FLTR2 GND 4 5 TSET MSOP-8 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.7 Oct 08, 2013 1