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TPS40200_08

更新时间： 2024-11-27 07:04:47
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德州仪器 - TI 输入元件控制器
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46页 1374K
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WIDE INPUT RANGE NON-SYNCHRONOUS VOLTAGE MODE CONTROLLER

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TPS40200_08 数据手册

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TPS40200  
www.ti.com ........................................................................................................................................ SLUS659D–FEBRUARY 2006–REVISED NOVEMBER 2008  
WIDE INPUT RANGE NON-SYNCHRONOUS VOLTAGE MODE CONTROLLER  
1
FEATURES  
DESCRIPTION  
•
•
•
•
•
•
Input Voltage Range 4.5 to 52 V  
Output Voltage (700 mV to 90% VIN)  
200 mA Internal P-Channel FET Driver  
Voltage Feed-Forward Compensation  
Undervoltage Lockout  
The TPS40200 is  
a
flexible non-synchronous  
controller with a built in 200-mA driver for P-channel  
FETs. The circuit operates with inputs up to 52 V with  
a power-saving feature that turns off driver current  
once the external FET has been fully turned on. This  
feature extends the flexibility of the device, allowing it  
to operate with an input voltage up to 52 V without  
dissipating excessive power. The circuit operates with  
voltage-mode feedback and has feed-forward  
input-voltage compensation that responds instantly to  
input voltage change. The integral 700-mV reference  
is trimmed to 2%, providing the means to accurately  
control low voltages. The TPS40200 is available in  
and 8-pin SOIC and an 8-pin QFN package and  
supports many of the features of more complex  
Programmable Fixed Frequency (35–500 kHz)  
Operation  
•
•
•
•
•
•
Programmable Short Circuit Protection  
Hiccup Overcurrent Fault Recovery  
Programmable Closed Loop Soft Start  
700 mV 1% Reference Voltage  
External Synchronization  
Small 8-Pin SOIC (D) and QFN (DRB) Packages  
controllers.  
Clock  
frequency,  
soft-start,  
and  
overcurrent limit are each easily programmed by a  
single, external component. The part has  
undervoltage lockout, and can be easily synchronized  
to other controllers or a system clock to satisfy  
sequencing and/or noise-reduction requirements.  
APPLICATIONS  
•
•
•
•
•
Industrial Control  
Distributed Power Systems  
DSL/Cable Modems  
Scanners  
Major sections in this data sheet include:  
Telecom  
•
•
•
•
Specifications  
General Information  
Example Applications  
Design References  
TYPICAL APPLICATION  
VIN  
100  
90  
80  
70  
60  
50  
R5  
VIN = 8 V  
VIN = 12 V  
VIN = 16 V  
C1  
C3  
TPS40200  
1
2
3
4
RC  
VDD  
8
7
6
5
RSENSE  
C4  
SS  
ISNS  
C5  
R3  
COMP GDRV  
Q1 L1  
VOUT  
FB  
GND  
C2  
D1  
R4  
C6  
R1  
R2  
VOUT = 5 V  
0
0.5  
1
1.5  
2
2.5  
3
Load Current - A  
Figure 1. 12 V to 5 V Buck Converter with 94% Efficiency  
Figure 2. Typical Efficiency of Application Circuit 1  
(described in Application 1)  
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 © 2006–2008, Texas Instruments Incorporated  
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