G5345 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Triac Dimmable Offline LED Driver

Global Mixed-mode Technology
G5345
Triac Dimmable Offline LED Driver
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
Retro Fit Lamps
Solid State Lighting
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
ORDER
NUMBER
G5345P81U
Note: P8: MSOP-8
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G5345
TEMP.
RANGE
-40°C to +125°C
G5345
VPP 1
8 VIN1
GATE 2
7 FLTR1
ISNS 3
6 FLTR2
GND 4
5 TSET
MSOP-8
Ver: 0.7
Oct 08, 2013
1
PACKAGE
(Green)
MSOP-8
TEL: [phone]
http://www.gmt.com.tw