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LT1970A

更新时间： 2024-09-14 11:45:15
品牌 Logo 应用领域
凌特 - Linear 运算放大器
页数 文件大小 规格书
24页 255K
描述
500mA Power Op Amp with Adjustable Precision Current Limit

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LT1970A  
500mA Power Op Amp with  
Adjustable Precision Current Limit  
FEATURES  
DESCRIPTION  
The LT®1970A is a 500mA power op amp with precise  
externally controlled current limiting. Separate control  
voltages program the sourcing and sinking current limit  
sense thresholds with 1% accuracy. Output current may  
be boosted by adding external power transistors.  
n
±±550m Miꢃi0u0 Output ꢂurreꢃt  
n
IꢃAepeꢃAeꢃt mAduꢀt0eꢃt of Source ꢁꢃA  
Siꢃk ꢂurreꢃt ꢄi0itꢀ  
1% ꢂurreꢃt ꢄi0it mccurꢁcy  
I0proveA Reꢁctive ꢄoꢁA Driviꢃg Stꢁaility  
Operates with Single or Split Supplies  
Shutdown/Enable Control Input  
Open-Collector Status Flags:  
n
n
n
The circuit operates with single or split power supplies  
from 5V to 36V total supply voltage. In normal opera-  
tion, the input stage supplies and the output stage sup-  
n
n
Sink Current Limit  
Source Current Limit  
Thermal Shutdown  
+
–
plies are connected (V to V and V to V ). To reduce  
CC  
EE  
power dissipation it is possible to power the output stage  
+
–
(V ,V )fromindependent,lowervoltagerails.Theamplifier  
isunity-gainstablewitha3.6MHzgain-bandwidthproduct  
and slews at 1.6V/μs. The LT1970A can drive capacitive  
and inductive loads directly.  
n
Fail-Safe Current Limit and Thermal Shutdown  
n
1.6V/μs Slew Rate  
3.6MHz Gain-Bandwidth Product  
Specified Temperature Range: –40°C to 85°C  
Available in a 20-Lead TSSOP Package  
n
n
n
Open-collector status flags signal current limit circuit  
activation, as well as thermal shutdown of the amplifier.  
An enable logic input puts the amplifier into a low power,  
high impedance output state when pulled low. Thermal  
shutdown and a 800mA fixed current limit protect the  
chip under fault conditions.  
APPLICATIONS  
n
Automatic Test Equipment  
n
Laboratory Power Supplies  
n
Motor Drivers  
Thermoelectric Cooler Driver  
n
TheLT1970Aispackagedina20-leadTSSOPpackagewith  
a thermally conductive copper bottom plate to facilitate  
heat sinking.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
Device Power Supply (DPS) with ±±550m mAduꢀtꢁale ꢂurreꢃt ꢄi0it  
V
LIMIT  
0V TO 5V  
20V  
20V  
6k  
CURRENT LIMIT = 500mA  
V
CC  
V
LIMIT  
ꢀꢁꢂtꢂ3  
+
I
=
V
OUT(MAX)  
V
, R = 100Ω  
LOAD LOAD  
CS  
EN  
VC  
I
OUT  
SRC  
VC  
V
IN  
+IN  
SNK  
R
CS  
ISNK  
TRACE R TRACE L  
100mΩ 200nH  
V
LOAD  
,
1Ω  
LOAD  
= 10Ω  
ISRC  
2V/DIV  
0V  
R
1/4W  
TSD  
LT1970A  
OUT  
+
SENSE  
4.7μF  
V
, 5V/DIV  
–
IN  
SENSE  
LOAD  
SENSE  
ESR  
0.1Ω  
–
V
–IN  
COMMON  
V
EE  
1970A TA01  
100μs/DIV  
–5V  
10k  
100pF  
1970A TA01b  
1970afa  
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