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Product details

Parameters

Topology Half-Bridge, Resonant LLC Control method Voltage VCC (Min) (V) 11 VCC (Max) (V) 18 Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) 9.3/9 Frequency (Max) (kHz) 300 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 0.8 Features PWM Dimming Input, Soft Start Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

SOIC (DW) 20 132 mm² 12.8 x 10.3 open-in-new Find other PWM controllers & resonant controllers

Features

  • Closed-Loop LED String Current Control
  • PWM Dimming Input
  • Adjustable FMIN (3% accuracy), and FMAX (7.5% Accuracy)
  • LLC and Series LED Switch Control for Dimming
  • Programmable Dimming LLC ON/OFF Ramp for Elimination of Audible Noise
  • Closed-Loop Current Control at Low Dimming Duty Cycles
  • Programmable Soft Start
  • Accurate VREF for Tight Output Regulation
  • Overvoltage, Undervoltage and Input Overcurrent Protection With Auto-Restart Response
  • Second Overcurrent Threshold With Latch-Off Response
  • 400-mA/-800-mA Gate Drive Current
  • Low Start-Up and Operating Currents
  • Lead (Pb)-Free, 20-Pin, SOIC Package
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Description

The UCC25710 device is an LLC half-bridge controller for accurate control of multi-string LED backlight applications. It is optimized for multi-transformer, multi-string LED architectures. Superior LED current matching in multiple strings can be achieved with this controller and architecture. Compared to existing LED backlight solutions, the multi-transformer architecture provides the highest overall efficiency from AC input to LED load.

The LLC controller function includes a Voltage Controlled Oscillator (VCO) with programmable FMIN and FMAX, half-bridge gate drivers with a fixed dead time of 500 ns and a GM current amplifier. The LLC power delivery is modulated by the controller’s VCO frequency. The VCO has an accurate and programmable frequency range. At very low power levels the VCO frequency goes from FMAX to zero to maximize efficiency at low LED currents.

The LED current loop reference is set by a divider off the VREF 5-V output. The reference can be varied over a 0.5-V to 2.6-V range, allowing analog dimming to be combined with PWM dimming.

PWM dimming is used to control an external LED series switch and also to gate on and off the LLC power stage. The LEDSW output along with a simple drive circuit is used to switch on and off the LED string current. This output responds directly to the input signal at the dimming input, DIM. The LLC is also ramped on and off with the dimming PWM input. The on and off LLC dimming edges are ramped at programmable slew rates to control audible noise. The dimming function includes duty-cycle compensation to allow optimization of overall efficiency and dimming linearity over a maximum range.

The control voltage to the VCO is set by ICOMP (current amplifier output) during LED ON-times. During start-up the soft-start pin, SS, controls the VCO response until it exceeds ICOMP. During dimming the rise and fall rates of the VCO input are controlled by the voltage at the dimming slew rate, DSR, pin while the pedestal of VCO control level continues to be controlled by ICOMP. The current amplifier output is connected to ICOMP only during the commanded dimming LED ON-time. The LLC on-time is extended beyond the LED current ON-time at low dimming duty-cycles to maintain closed-loop control of the LED current.

Protection thresholds for LED string overvoltage and undervoltage conditions are set with external resistive dividers and accurate internal thresholds. Input current to the converter is monitored with both a restart and latchoff response depending on the overcurrent level. The controller also includes thermal shutdown protection.

The auto restart response to any fault includes a 10-ms reset period followed by a soft start. In the case of a severe input overcurrent, restart is disabled until the input supply is cycled through its UVLO threshold.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet UCC25710 LLC Half-Bridge Controller For Multi-String LED Lighting datasheet (Rev. B) Feb. 15, 2016
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes A New Off-line LED Lighting Driver Solution with multi-transformer LLC Control (Rev. A) Sep. 13, 2011
Application notes UCC25710 98-W LLC Resonant Half-Bridge 4-String LED Driver Design May 17, 2011
User guides Using the UCC25710EVM-654 (Rev. A) Mar. 22, 2011

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
149
Description
The UCC25710EVM-654 is a fully assembled and tested circuit for evaluating the UCC25710 LLC Half Bridge Controller for Multi-string LED Lighting.
Features
  • Closed Loop LED String Current Control
  • PWM Dimming Input
  • Adjustable FMIN (3% accuracy), and FMAX 7.5% (accuracy)
  • LLC and Series LED Switch Control for Dimming
  • Programmable Dimming LLC ON/OFF Ramp for Elimination of Audible Noise
  • Closed Loop Current Control at Low Dimming Duty-Cycles
  • Programmable Soft (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CALCULATION TOOLS Download
SLUC253.ZIP (1680 KB)

Reference designs

REFERENCE DESIGNS Download
Using UCC25710 to design cost effective LED Power
PMP6252 — PMP6252 is a reference design for 90W LCD TV power by using the UCC28051 to construct PFC, UCC25710 to construct LED driver LLC converter, UCC25600 to construct 5V and 12V converter and UCC28610 to construct standby flyback converter. This driver provides 4 outputs including LED driver, 12.7V 3A, 5V (...)
REFERENCE DESIGNS Download
380V/350mA Dimmable LED Driver using Single String LLC Solution without Dimming FET
PMP4371 — This design is based on PMP4350 and supports higher output voltage up to 380V. Different from PMP4350, the high voltage LED switch MOSFET is removed and reduced overall cost. With additional resistor and capacitor from LEDSW to CS pin, the LED driver demos good linearity dimming performnace under (...)
Design files
REFERENCE DESIGNS Download
Universal AC Input 150W Single String 200V/700mA Output LLC Converter without CT
PMP4350 — The reference design is a high effiency (>94%) isolated AC/DC single string output LED lighting solution for high watt (>100W) general LED lighting. The topology uses Transition Mode (TM) PFC plus LLC control, which can support PWM dimming and analog dimming on the output side. The target (...)
Design files
REFERENCE DESIGNS Download
90 to 264Vac In 100W 4x500mA LED Lighting Driver W/O Aux Flyback Power Supply f/Vcc Reference Design
PMP4302B — This reference design uses TI multi-transformer LLC controller UCC25710 and transition mode PFC controller UCC28810 to develop a 100W four strings with 500mA per string output for general LED lighting driver. The key benefits for this solution are high efficiency, high power factor and good current (...)
Design files
REFERENCE DESIGNS Download
Universal AC input(90V-264V) high efficiency 150W single string 200V/700mA output LLC converter
PMP4317 — The reference design is a very high effiency (>94%) isolated AC/DC single string output LED lighting solution for high watt (>100W) general LED lighting. The topology uses Transition Mode (TM) PFC plus LLC control, which can support PWM dimming and analog dimming on the output side. The target (...)
Design files
REFERENCE DESIGNS Download
Design files

CAD/CAE symbols

Package Pins Download
SOIC (DW) 20 View options

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