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LT1076_15

更新时间： 2024-11-25 01:14:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
16页 190K
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Step-Down Switching Regulator

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LT1076_15 数据手册

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LT1074/LT1076  
Step-Down Switching  
Regulator  
ponents,areincludedonthechip.Thetopologyisaclassic  
positive “buck” configuration but several design innova-  
tions allow this device to be used as a positive-to-negative  
converter, a negative boost converter, and as a flyback  
converter. The switch output is specified to swing 40V  
below ground, allowing the LT1074 to drive a tapped-  
inductor in the buck mode with output currents up to 10A.  
FEATURES  
■
5A Onboard Switch (LT1074)  
■
Operates Up to 60V Input  
■
100kHz Switching Frequency  
■
Greatly Improved Dynamic Behavior  
■
Available in Low Cost 5 and 7-Lead Packages  
■
Only 8.5mA Quiescent Current  
The LT1074 uses a true analog multiplier in the feedback  
loop. This makes the device respond nearly instanta-  
neously to input voltage fluctuations and makes loop gain  
independent of input voltage. As a result, dynamic behav-  
ior of the regulator is significantly improved over previous  
designs.  
■
Programmable Current Limit  
■
Micropower Shutdown Mode  
U
APPLICATIO S  
■
Buck Converter with Output Voltage Range of 2.5V  
On-chip pulse by pulse current limiting makes the LT1074  
nearlybust-proofforoutputoverloadsorshorts.Theinput  
voltage range as a buck converter is 8V to 60V, but a self-  
boot feature allows input voltages as low as 5V in the  
inverting and boost configurations.  
to 50V  
■
Tapped-Inductor Buck Converter with 10A Output  
at 5V  
■
Positive-to-Negative Converter  
■
Negative Boost Converter  
■
Multiple Output Buck Converter  
TheLT1074isavailableinlowcostTO-220orDDpackages  
with frequency pre-set at 100kHz and current limit at 6.5A  
(LT1076 = 2.6A). A 7-pin TO-220 package is also available  
which allows current limit to be adjusted down to zero. In  
addition, full micropower shutdown can be programmed.  
See Application Note 44 for design details.  
U
DESCRIPTIO  
The LT®1074 is a 5A (LT1076 is rated at 2A) monolithic  
bipolar switching regulator which requires only a few  
external parts for normal operation. The power switch, all  
oscillator and control circuitry, and all current limit com-  
A fixed 5V output, 2A version is also available. See LT1076-5.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
Buck Converter Efficiency  
TYPICAL APPLICATIO  
LT1074  
Basic Positive Buck Converter  
100  
L1**  
50µH (LT1074)  
V
= 12V, V = 20V  
IN  
OUT  
100µH (LT1076)  
90  
80  
5V  
V
V
IN  
SW  
FB  
5A  
* USE MBR340 FOR LT1076  
** COILTRONICS #50-2-52 (LT1074)  
#100-1-52 (LT1076)  
PULSE ENGINEERING, INC.  
#PE-92114 (LT1074)  
10V TO 40V  
R1  
2.8k  
1%  
LT1074  
MBR745*  
V
= 5V, V = 15V  
IN  
OUT  
70  
60  
50  
GND  
V
C
#PE-92102 (LT1076)  
HURRICANE #HL-AK147QQ (LT1074)  
R2  
2.21k  
1%  
R3  
L = 50µH TYPE 52 CORE  
DIODE = MBR735  
2.7k  
#HL-AG210LL (LT1076)  
+
+
C3†  
200µF  
C2  
0.01µF  
C1  
500µF  
25V  
†
RIPPLE CURRENT RATING ≥ I /2  
OUT  
0
1
2
3
4
5
6
OUTPUT LOAD CURRENT (A)  
LT1074•TPC27  
LT1074•TA01  
sn1074 1074fds  
1
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