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UCC383-X PDF预览

UCC383-X

更新时间： 2024-09-25 04:48:11
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
17页 464K
描述
LOW DROPOUT 3-A LINEAR REGULATOR FAMILY

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UCC383-X 数据手册

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SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004  
TO−263−3 TD PACKAGE  
(FRONT VIEW)  
TO−263−5 TD PACKAGE  
(FRONT VIEW)  
D
D
D
D
Precision Positive Linear Series Pass  
Voltage Regulation  
5
4
3
2
1
VOUT  
0.45 V Dropout at 3 A  
3
2
1
VOUT  
GND  
VIN  
ADJ  
GND  
CT  
50 mV Dropout at 10 mA  
Quiescent Current Under 650 µA  
Irrespective of Load  
VIN  
D
Adjustable (5-Lead) Output Voltage Version  
TO−220−5 T PACKAGE  
(FRONT VIEW)  
D
Fixed (3-Lead) Versions for 3.3-V and 5-V  
Outputs  
5
4
3
2
1
VOUT  
ADJ  
GND  
CT  
D
D
Logic Shutdown Capability  
+
Short-Circuit Power Limit of  
(3% × V × I  
)
VIN  
IN  
SHORT  
D
Low V  
to V Reverse Leakage  
OUT IN  
D
Thermal Shutdown  
TO−220−3 T PACKAGE  
(FRONT VIEW)  
description  
VOUT  
GND  
VIN  
3
2
The UCC283−3/−5/−ADJ family of positive linear  
+
series pass voltage regulators are tailored for  
low-drop-out applications where low quiescent  
power is important. Fabricated with a BiCMOS  
technology ideally suited for low input-to-output  
differential applications, the UCC283−5 passes  
3 A while requiring only 0.45 V of typical input  
voltage headroom (ensured 0.6-V dropout).  
1
These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent  
current is always less than 650 µA. These devices have been internally compensated in such a way that the  
need for a minimum output capacitor has been eliminated.  
UCC283−3 and UCC283−5 versions are in 3-lead packages and have preset outputs at 3.3 V and 5.0 V  
respectively. The output voltage is regulated to 1.5% at room temperature. The UCC283−ADJ version, in a  
5-lead package, regulates the output voltage programmed by an external resistor ratio.  
Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning  
off after a t  
time delay. The device then stays off for a period, t  
, that is 32 times the t  
delay. The device  
ON  
OFF  
ON  
then begins pulsing on and off at the t /(t +t  
) duty cycle of 3%. This drastically reduces the power  
ON ON OFF  
dissipation during short-circuit and means heat sinks need only accommodate normal operation. On the  
3-leaded versions of the device t  
is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor  
ON  
sets the on time. The off time is always 32 × t . The external timing control pin, CT, on the 5-leaded versions  
ON  
also serves as a shutdown input when pulled low.  
Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown  
occurs if the junction temperature exceeds 165°C. The chip remains off until the temperature has dropped 20°C.  
The UCC283 series is specified for operation over the industrial range of −40°C to 85°C, and the UCC383 series  
is specified from 0°C to 70°C. These devices are available in 3- and 5-pin TO−220 and TO−263 power packages.  
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.  
All trademarks are the property of their respective owners.  
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Copyright 1998−2004, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...17

中文翻译

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