TPS92075_14 Datasheet, PDF (1/29 Pages) Texas Instruments – Non-Isolated, Phase Dimmable, Buck PFC LED Driver with Digital Reference Control

TPS92075
www.ti.com
SLUSB88B – DECEMBER 2012 – REVISED JANUARY 2014
Non-Isolated, Phase Dimmable, Buck PFC LED Driver
with Digital Reference Control
Check for Samples: TPS92075
FEATURES
1
• Controlled Reference Derived PFC
• Integrated Digital Phase-Angle Decoder
• Digital 50/60 Hz Synchronization
• Phase-Symmetry Balancing
• Constant LED current operation
• Fast Start-up
• Dimming Implemented Via Analog Reference
Control
• Smooth Dimming Transitions
• Overvoltage Protection
• Feedback Short-Circuit Protection
• Leading and Trailing Edge Dimmer
Compatibility
• Low BOM Cost and Small PCB Footprint
• Patent Pending Digital Architecture
• Available in 8-Pin SOIC and 6-Pin TSOT
APPLICATIONS
• Bulb Replacement
• Area Lighting
• Dimmable and Non-Dimmable LED Lamps
DESCRIPTION
The TPS92075 is a hybrid power factor controller
(PFC) with a built-in phase dimming decoder. The
device analyzes line cycles continuously using an
internal, low-power, digital controller for shape and
symmetry. The power converter stage generates an
analog current reference and uses it to regulate the
output current. The device uses control algorithms to
manipulate the analog reference. These algorithms
optimize dimmer compatibility, power factor and total
harmonic distortion (THD).
Using a constant off-time control, the solution
achieves low component count, high efficiency and
inherently provides variation in the switching
frequency. This variation creates an emulated spread
spectrum effect easing the converters EMI signature
and allowing a smaller input filter.
The TPS92075 also includes standard features:
current limit, overvoltage protection, thermal shut-
down, and VCC undervoltage lockout, all in packages
utilizing only 6 pins.
SIMPLIFIED APPLICATION DIAGRAM
V_IN
AC
Triac
Dimmer
EMI
Filter
TPS92075
ASNS COFF
GND VCC
ISNS GATE
A
A
B
Buck-Boost
OR
B
Buck
UDG-12144
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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