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UCC28950_11

更新时间： 2024-11-23 08:25:55
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德州仪器 - TI 控制器
页数 文件大小 规格书
46页 826K
描述
Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification

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UCC28950_11 数据手册

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UCC28950  
www.ti.com  
SLUSA16A –MARCH 2010–REVISED JULY 2010  
Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification  
Check for Samples: UCC28950  
1
FEATURES  
APPLICATIONS  
•
•
•
•
•
Phase-Shifted Full-Bridge Converters  
Server, Telecom Power Supplies  
Industrial Power Systems  
High-Density Power Architectures  
Solar Inverters, and Electric Vehicles  
•
Enhanced Wide Range Resonant Zero Voltage  
Switching (ZVS) Capability  
•
•
Direct Synchronous Rectifier (SR) Control  
Light-Load Efficiency Management Including  
–
–
Burst Mode Operation  
Discontinuous Conduction Mode (DCM),  
Dynamic SR On/Off Control with  
Programmable Threshold  
DESCRIPTION  
The UCC28950 enhanced phase-shifted controller  
builds upon Texas Instrument’s industry standard  
UCCx895 phase-shifted controller family with  
enhancements that offer best in class efficiency in  
today’s high performance power systems. The  
UCC28950 implements advanced control of the  
full-bridge along with active control of the  
synchronous rectifier output stage.  
–
Programmable Adaptive Delay  
•
Average or Peak Current Mode Control with  
Programmable Slope Compensation and  
Voltage Mode Control  
•
•
Closed Loop Soft Start and Enable Function  
Programmable Switching Frequency up to 1  
MHz with Bi-Directional Synchronization  
The primary-side signals allow programmable delays  
to ensure ZVS operation over wide-load current and  
input voltage range, while the load current naturally  
tunes the secondary-side synchronous rectifiers  
switching delays, maximizing overall system  
efficiency.  
•
(+/-3%) Cycle-by-Cycle Current Limit  
Protection with Hiccup Mode Support  
•
•
•
150-µA Start-Up Current  
VDD Under Voltage Lockout  
Wide Temperature Range -40°C to 125°C  
UCC28950 Typical Application  
+
CT  
VS  
CREF  
UCC28950  
VREF  
-
R1  
R2  
1
2
3
4
5
6
7
8
9
GND 24  
VDD 23  
CVDD  
EA+  
VDD  
VDD  
VDD  
R3  
EA-  
OUTA 22  
OUTB 21  
OUTC 20  
OUTD 19  
OUTE 18  
OUTF 17  
SYNC 16  
CS 15  
A
B
C
D
E
F
C1  
VSENSE  
R5  
QA  
QC  
C2  
COMP  
SS/EN  
DELAB  
DELCD  
DELEF  
TMIN  
A
C
R4  
R6  
C3  
CSS  
RAB  
ENABLE  
VDD  
VDD  
RCD  
REF  
QB  
QD  
B
D
RTMIN  
SYNC  
RA(hi)  
VOUT  
RT  
+
VREF  
10 RT  
UCC27324  
QE  
UCC27324  
RSUM  
11 RSUM  
12 DCM  
ADEL 14  
ADELEF 13  
QF  
RAEF(hi)  
E
F
RDCM(hi)  
VREF  
Voltage Current  
Sense  
-
RA  
RAEF  
R7  
RCS  
RDCM  
VSENSE  
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 © 2010, Texas Instruments Incorporated  
 
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