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LT1072CHVCK PDF预览

LT1072CHVCK

更新时间： 2024-11-23 23:48:19
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
16页 197K
描述
SMPS Controller

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LT1072CHVCK 数据手册

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LT1072  
1.25A High Efficiency  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LT®1072 is a monolithic high power switching  
regulator. It can be operated in all standard switching  
configurations including buck, boost, flyback, forward,  
inverting and “Cuk”. A high current, high efficiency switch  
is included on the die along with all oscillator, control, and  
protection circuitry. Integration of all functions allows the  
LT1072 to be built in a standard 5-pin TO-3 or TO-220  
power package as well as the 8-pin miniDlP. This makes it  
extremelyeasytouseandprovides“bustproof”operation  
similar to that obtained with 3-pin linear regulators.  
■
Available in MiniDiP, TO-220, and TO-3 Packages  
■
Wide Input Voltage Range 3V to 60V  
■
Low Quiescent Current—6mA  
■
Internal 1.25A Switch  
■
Very Few External Parts Required  
■
Self-Protected Against Overloads  
■
Operates in Nearly All Switching Topologies  
■
Shutdown Mode Draws Only 50µA Supply Current  
■
Flyback-Regulated Mode has Fully Floating Outputs  
■
Can be Externally Synchronized  
U
TheLT1072operateswithsupplyvoltagesfrom3Vto60V,  
and draws only 6mA quiescent current. It can deliver load  
power up to 20 watts with no external power devices. By  
utilizing current-mode switching techniques, it provides  
excellent AC and DC load and line regulation.  
APPLICATIO S  
■
Logic Supply 5V at 2.5A  
5V Logic to ±15V Op Amp Supply  
■
■
Offline Converter up to 50W  
Battery Upconverter  
■
The LT1072 has many unique features not found even on  
the vastly more difficult to use low power control chips  
presently available. It uses an adaptive anti-sat switch  
drive to allow very wide ranging load currents with no loss  
in efficiency. An externally activated shutdown mode  
reduces total supply current to 50µA typical for standby  
operation. Totally isolated and regulated outputs can be  
generatedbyusingtheoptional“flybackregulationmode”  
builtintotheLT1072, withouttheneedforoptocouplersor  
extra transformer windings.  
■
Power lnverter (+ to –) or (– to +)  
■
Fully Floating Multiple Outputs  
■
Driver for High Current Supplies  
USER NOTE:  
This data sheet is only intended to provide specifications, graphs, and a general functional  
description of the LT1072. Application circuits are included to show the capability of the LT1072.  
A complete design manual (AN-19) should be obtained to assist in developing new designs. This  
manualcontainsacomprehensivediscussionofboththeLT1070andtheexternalcomponentsused  
with it, as well as complete formulas for calculating the values of these components. The manual  
can also be used for the LT1072 by factoring in the lower switch current rating.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
Boost Converter (5V to 12V)  
Maximum Output Power*  
25  
5V  
220µH**  
20  
V
IN  
V
SW  
BUCK-BOOST  
V
= 30V  
O
15  
10  
5
12V, 0.25A  
LT1072  
+
–
C3  
25µF*  
FLYBACK  
ISOLATED  
10.7k  
1.24k  
BOOST  
FB  
GND  
V
C
+
–
470µF  
1k  
+
–
BUCK-BOOST  
1µF  
V
= 5V  
O
0
0
10  
20  
30  
40  
50  
*REQUIRED IF INPUT LEADS ≥ 2”  
**PULSE ENGINEERING 52626  
LT1072 • TA01  
INPUT VOLTAGE (V)  
*ROUGH GUIDE ONLY. BUCK MODE P = 1A x V  
.
OUT  
OUT  
MINIDIP OUTPUT POWER MAY BE LIMITED BY PACKAGE TEMPERATURE  
RISE AT HIGH INPUT VOLTAGES OR HIGH DUTY CYCLES  
LT1072 • TA02  
1072fc  
1
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