UCC25710DWR

更新时间： 2022-04-02 04:27:09

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
34页	1522K
描述
LLC Half-Bridge Controller For Multi-String LED Lighting

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UCC25710DWR 数据手册

UCC25710

www.ti.com

SLUSAD7A –APRIL 2011–REVISED MAY 2011

LLC Half-Bridge Controller For Multi-String LED Lighting

Check for Samples: UCC25710

FEATURES

APPLICATIONS

•

Closed Loop LED String Current Control

PWM Dimming Input

•

LED Backlight for LCD TV and Monitors

LED General Lighting

Adjustable F_MIN(3% accuracy), and F_MAX(7.5%

accuracy)

DESCRIPTION

The UCC25710 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.

•

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 V_REFfor Tight Output Regulation

The LLC controller function includes a Voltage

Controlled Oscillator (VCO) with programmable F_MIN

and F_MAX, 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 F_MAXto zero to

maximize efficiency at low LED currents.

Over-Voltage, Under-Voltage and Input

Over-Current Protection with Auto-Restart

Response

•

Second Over-Current 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

Simplified Application Diagram

LED String 1

LED String 2

LED String N

Efficiency and Linearity Results

(Dual 45-W Strings)

–

VIN

100

Efficiency

20 V to 9.5 V

UCC25710

VCC

DTY

Linearity

ON/OFF

10 BLON

DADJ

GD1

GD2

GND

FMIN 20

FMAX 19

SS 18

-2

-4

13 CL

ICOMP 17

CS 16

15 CREF

VREF

14 DSR

LEDSW

OV 12

UV 11

100

DIM

Dimming Duty Cycle -%

DIM PWM Output

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.

12 3 4 5 6 7...34

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