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LT1970_1

更新时间： 2024-09-14 05:43:27
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 540K
描述
500mA Power Op Amp with Adjustable Precision Current Limit

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LT1970  
500mA Power Op Amp with  
Adjustable Precision Current Limit  
U
FEATURES  
DESCRIPTIO  
The LT®1970 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 2% accuracy. Output current may  
be boosted by adding external power transistors.  
■
±500mA Minimum Output Current  
■
Independent Adjustment of Source and  
Sink Current Limits  
2% Current Limit Accuracy  
■
■
Operates with Single or Split Supplies  
■
Shutdown/Enable Control Input  
Thecircuitoperateswithsingleorsplitpowersuppliesfrom  
5V to 36V total supply voltage. In normal operation, the  
inputstagesuppliesandtheoutputstagesuppliesarecon-  
nected (VCC to V+ and VEE to V–). To reduce power dissi-  
pationitispossibletopowertheoutputstage(V+,V–)from  
independent,lowervoltagerails.Theamplifierisunity-gain  
stable with a 3.6MHz gain bandwidth product and slews at  
1.6V/µs. The current limit circuits operate with a 2MHz re-  
sponse between the VCSRC or VCSNK control inputs and  
the amplifier output.  
■
Open Collector Status Flags:  
Sink Current Limit  
Source Current Limit  
Thermal Shutdown  
■
Fail Safe Current Limit and Thermal Shutdown  
■
1.6V/µs Slew Rate  
3.6MHz Gain Bandwidth Product  
■
■
Fast Current Limit Response: 2MHz Bandwidth  
■
Specified Temperature Range: –40°C to 85°C  
■
Available in a 20-Lead TSSOP Package  
Open collector status flags signal current limit circuit  
activation,aswellasthermalshutdownoftheamplifier.An  
enable logic input puts the amplifier into a low power, high  
impedance output state when pulled low. Thermal shut-  
down and a ±800mA fixed current limit protect the chip  
under fault conditions.  
U
APPLICATIO S  
■
Automatic Test Equipment  
Laboratory Power Supplies  
■
■
Motor Drivers  
■
Thermoelectric Cooler Driver  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
The LT1970 is packaged in a 20-lead TSSOP package with  
a thermally conductive copper bottom plate to facilitate  
heat sinking.  
U
TYPICAL APPLICATIO  
A = 2 Amplifier with Adjustable ±500mA Full-Scale  
V
Current Limit and Fault Indication  
Current Limited Sinewave Into 10Ω Load  
V
LIMIT  
0V TO 5V  
15V  
15V  
3k  
V
LIMIT  
10 • R  
I
= ±  
OUT(LIMIT)  
V
CC  
CS  
+
V
4V  
EN  
VC  
2V  
SRC  
VC  
V
+IN  
IN  
VLOAD  
SNK  
ISNK  
R
CS  
0V  
1Ω  
I
ISRC  
OUT  
1/4W  
–2V  
TSD  
+
LT1970  
OUT  
SENSE  
–
SENSE  
V
–
LOAD  
R1  
–IN  
COMMON  
V
EE  
10k  
VCSRC = 4V  
VCSNK = 2V  
RCS = 1Ω  
20µs/DIV  
1970 TA02  
R2  
10k  
–15V  
1970 TA01  
1970fb  
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