Product details

Control mode Voltage Features LLC, PWM Dimming Input, Soft Start Operating temperature range (C) -40 to 125 Supply voltage (Max) (V) 18 Supply voltage (Min) (V) 11 Topology Half-Bridge, Resonant LLC
Control mode Voltage Features LLC, PWM Dimming Input, Soft Start Operating temperature range (C) -40 to 125 Supply voltage (Max) (V) 18 Supply voltage (Min) (V) 11 Topology Half-Bridge, Resonant LLC
SOIC (DW) 20 132 mm² 12.8 x 10.3
  • 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
  • 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

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.

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

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Type Title Date
* Data sheet UCC25710 LLC Half-Bridge Controller For Multi-String LED Lighting datasheet (Rev. B) 15 Feb 2016
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note A New Off-line LED Lighting Driver Solution with multi-transformer LLC Control (Rev. A) 13 Sep 2011
Application note UCC25710 98-W LLC Resonant Half-Bridge 4-String LED Driver Design 17 May 2011
User guide Using the UCC25710EVM-654 (Rev. A) 22 Mar 2011

Design & development

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

Evaluation board

UCC25710EVM-654 — Evaluation Module for UCC25710 LED TV Backlight Controller

The UCC25710EVM-654 is a fully assembled and tested circuit for evaluating the UCC25710 LLC Half Bridge Controller for Multi-string LED Lighting.
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Calculation tool

UCC25710 MathCAD Design Tool

SLUC253.ZIP (1680 KB)
リファレンス・デザイン

PMP6252 — Using UCC25710 to design cost effective LED Power

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 (...)
リファレンス・デザイン

PMP4371 — 380V/350mA Dimmable LED Driver using Single String LLC Solution without Dimming FET

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 (...)
リファレンス・デザイン

PMP4350 — Universal AC Input 150W Single String 200V/700mA Output LLC Converter without CT

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 (...)
リファレンス・デザイン

PMP4302B — 90 to 264Vac In 100W 4x500mA LED Lighting Driver W/O Aux Flyback Power Supply f/Vcc Reference Design

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 (...)
リファレンス・デザイン

PMP4317 — Universal AC input(90V-264V) high efficiency 150W single string 200V/700mA output LLC converter

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 (...)
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SOIC (DW) 20 View options

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