TPS92070 Datasheet, PDF (1/20 Pages) Texas Instruments – High-Efficiency Integrated Dimming LED Lighting Controller

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TPS92070
SLUSAN1 – DRAFT 6 * AUGUST 30, 2011
High-Efficiency Integrated Dimming LED Lighting Controller
Check for Samples: TPS92070
FEATURES
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• Advanced Integrated Dimming Interface
• Non-Dissipative TRIAC Dimmer Management
• Lamp-to-Lamp Uniformity During Dimming
• No Low-Frequency Photometric Ripple
• Exponential Dimming Profile
• Innovative Secondary-Side Feedback
Eliminates Optocoupler Devices
• LED Current Regulation better than 5%
• Programmable Minimum LED Current
• Valley Switching and DCM Operation for
Reduced EMI and Improved Efficiency
• Leading Edge Dimmer Detection
• Power Factor > 0.8
• Cycle-by-Cycle Current Limit Protection
• Low Start-Up and Standby Currents
• Integrated PWM MOSFET Driver
• Thermal Shutdown
• 16-Pin, TSSOP package
APPLICATIONS
• LED Light Bulb Replacement
• LED Luminaires
• LED Downlights
• LED Wall Washers
DESCRIPTION
The TPS92070 is an advanced PWM controller ideal
for use in low-power, offline, LED lighting
applications. The integrated dimming interface circuit
of the TPS92070 features a non-dissipative dimmer
trigger control circuit. The TPS92070 controller
provides DC LED current with no photometric ripple
effects. The DC current also results in higher efficacy
of the LEDs. The TPS92070 provides exponentially
controlled light output based on the external dimmer
position. High power factor is achieved with a valley
fill circuit. Once a leading-edge dimmer is detected,
the TPS92070 sets an output to disable the PFC
circuit and thus optimizes driver operation. The LED
current sense precision error amplifier implements
deep dimming. The TPS92070 current sensing
scheme provides tight current regulation and
eliminates the need for an optocoupler. The tight
current regulation allows for strong color and intensity
matching amongst individual bulbs or luminaires.
The TPS92070 also contains a variety of protection
features including cycle-by-cycle peak-current limit,
overcurrent protection, open-LED (output
overvoltage) protection, undervoltage lockout, and
thermal shutdown.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of 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.
Copyright © 2011, Texas Instruments Incorporated