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Technical content
Features
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
LED modules such as LED spots, down-lights LED strings suitable for retail displays, etc. 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 pro- vides 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 un- der-voltage lockout.
Ordering Information
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 1VPP G5345 MSOP-8 2GATE 3ISNS 6 54GND TSET FLTR2 7F L T R 1 8V I N 1