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UCC25710DWR

更新时间： 2024-12-01 11:58:27
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

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UCC25710  
www.ti.com  
SLUSAD7A –APRIL 2011–REVISED MAY 2011  
LLC Half-Bridge Controller For Multi-String LED Lighting  
Check for Samples: UCC25710  
1
FEATURES  
APPLICATIONS  
•
•
•
Closed Loop LED String Current Control  
PWM Dimming Input  
•
•
LED Backlight for LCD TV and Monitors  
LED General Lighting  
Adjustable FMIN (3% accuracy), and FMAX (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 VREF for Tight Output Regulation  
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.  
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)  
T1  
T2  
TN  
–
–
–
+
+
+
VIN  
100  
4
Efficiency  
95  
90  
2
0
20 V to 9.5 V  
UCC25710  
1
VCC  
DTY  
7
8
Linearity  
ON/OFF  
10 BLON  
DADJ  
2
3
4
GD1  
GD2  
GND  
FMIN 20  
FMAX 19  
SS 18  
85  
80  
-2  
-4  
13 CL  
ICOMP 17  
CS 16  
15 CREF  
5
VREF  
14 DSR  
LEDSW  
6
OV 12  
UV 11  
0
10  
100  
9
DIM  
Dimming Duty Cycle -%  
DIM PWM Output  
1
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  
1234567...34

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UCC25710DWR 替代型号

型号 品牌 替代类型 描述 数据表
UCC25710DW TI

完全替代

 LLC Half-Bridge Controller For Multi-String LED Lighting

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