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UCC2540

更新时间： 2024-09-18 22:41:47
品牌 Logo 应用领域
德州仪器 - TI 功效控制器
页数 文件大小 规格书
37页 560K
描述
HIGH EFFICIENCY SECONDARY SIDE SYNCHRONOUS BUCK PWM CONTROLLER

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中文翻译

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UCC2540 数据手册

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SLUS539A − JUNE 2004 − REVISED AUGUST 2004  
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FEATURES  
APPLICATIONS  
D
On-Chip Predictive Gate Drivet for  
High-Efficiency Synchronous Buck  
Operation  
D
Secondary-Side Post Regulation (SSPR) for  
Multiple Output Power Supplies  
D
Cascaded Buck Converters  
D
D
Dual 3-A TrueDrivet Outputs  
D
Post Processing Converters for Bus  
Converter and DC Transformer Architectures  
1-MHz High Frequency Operation with 70-ns  
Delay from SYNCIN to G1 Output  
DESCRIPTION  
D
Leading Edge Modulation  
The UCC2540 is a secondary-side synchronous  
D
Overcurrent Protection using a Parallel  
Average Current Mode Control Loop  
buck PWM controller for high current and low  
output voltage applications. It can be used either  
as the local secondary-side controller for isolated  
dc-to-dc converters using two-stage cascaded  
topologies or as a secondary-side post regulator  
(SSPR) for multiple output power supplies.  
D
3 Modes to Support 2.7-V to 35-V Bias  
Operation  
D
D
D
D
D
Reverse Current Protection for Output Stage  
User Programmable Shutdown  
1.0% Initial Tolerance Bandgap Reference  
High Bandwidth Error Amplifiers  
The UCC2540 runs with the synchronization  
signal from either the primary side or the high duty  
cycle quasi-dc output of bus converters or dc  
transformers. For higher efficiency, it also  
incorporates the Predictive Gate Drivet  
technology that virtually eliminates body diode  
conduction losses in synchronous rectifiers.  
Thermally Enhanced HTSSOP 20-Pin  
PowerPADt Package  
SIMPLIFIED APPLICATION DIAGRAM  
Main  
Output  
UCC25701  
Input  
C1  
OUT  
AUX  
Output  
RSNS  
FB  
QP  
V
FB  
UCC2540  
13 VDRV  
VEA−  
REF  
7
2
14 G2  
12 G2S  
16 VDD  
19 BST  
18 G1  
R1  
Main  
Output  
TR 10  
COMP  
9
3
G2C  
20 SWS  
17 SW  
15 PGND  
CEA−  
RSET  
8
1
5
R2  
11 SS SYNCIN RAMP  
4
UDG−04057  
Predictive Gate Drive, TrueDrive, and PowerPAD, are a trademarks of Texas Instruments Incorporated.  
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Copyright 2004, Texas Instruments Incorporated  
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ꢢ ꢦ ꢣ ꢢꢛ ꢜꢰ ꢞꢝ ꢡ ꢩꢩ ꢧꢡ ꢟ ꢡ ꢠ ꢦ ꢢ ꢦ ꢟ ꢣ ꢫ  
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UCC2540 替代型号

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