Datasheet LT1970 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 500mA Power Op Amp with Adjustable Precision Current Limit |
| 页数 / 页 | 26 / 1 — FeaTures. DescripTion. ± 500mA Minimum Output Current. Independent … |
| 文件格式/大小 | PDF / 402 Kb |
| 文件语言 | 英语 |
FeaTures. DescripTion. ± 500mA Minimum Output Current. Independent Adjustment of Source and. Sink Current Limits
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LT1970 500mA Power Op Amp with Adjustable Precision Current Limit
FeaTures DescripTion
n
± 500mA Minimum Output Current
The LT®1970 is a ±500mA power op amp with precise n
Independent Adjustment of Source and
externally controlled current limiting. Separate control
Sink Current Limits
voltages program the sourcing and sinking current limit n
2% Current Limit Accuracy
sense thresholds with 2% accuracy. Output current may n Operates with Single or Split Supplies be boosted by adding external power transistors. n Shutdown/Enable Control Input The circuit operates with single or split power supplies n Open Collector Status Flags: from 5V to 36V total supply voltage. In normal operation, Sink Current Limit the input stage supplies and the output stage supplies are Source Current Limit connected (VCC to V+ and VEE to V–). To reduce power Thermal Shutdown dissipation it is possible to power the output stage (V+, n Fail Safe Current Limit and Thermal Shutdown V–) from independent, lower voltage rails. The amplifier is n 1.6V/µs Slew Rate unity-gain stable with a 3.6MHz gain bandwidth product n 3.6MHz Gain Bandwidth Product and slews at 1.6V/µs. The current limit circuits operate n Fast Current Limit Response: 2MHz Bandwidth with a 2MHz response between the VC n SRC or VCSNK control Specified Temperature Range: –40°C to 85°C inputs and the amplifier output. n Available in a 20-Lead TSSOP Package Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier.
applicaTions
An enable logic input puts the amplifier into a low power, n Automatic Test Equipment high impedance output state when pulled low. Thermal n Laboratory Power Supplies shutdown and a ±800mA fixed current limit protect the n Motor Drivers chip under fault conditions. n Thermoelectric Cooler Driver The LT1970 is packaged in a 20-lead TSSOP package with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a thermally conductive copper bottom plate to facilitate Technology Corporation. All other trademarks are the property of their respective owners. heat sinking.
Typical applicaTion AV = 2 Amplifier with Adjustable ±500mA Full-Scale Current Limited Sinewave Into 10
Ω
Load Current Limit and Fault Indication
VLIMIT 0V TO 5V 15V 15V V 4V LIMIT 3k IOUT(LIMIT) = ±10 • R VCC CS 2V V+ENVC V 0V V LOAD IN +IN SRC VCSNK –2V ISNK RCS ISRC IOUT 1Ω TSD 1/4W LT1970 OUT SENSE+ SENSE– V– R1 LOAD VCSRC = 4V 20µs/DIV –IN V 1970 TA02 EE 10k VC COMMON SNK = 2V RCS = 1Ω R2 10k –15V 1970 TA01 1970fe For more information www.linear.com/LT1970 1 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Related Parts
FeaTures DescripTion
n
± 500mA Minimum Output Current
The LT®1970 is a ±500mA power op amp with precise n
Independent Adjustment of Source and
externally controlled current limiting. Separate control
Sink Current Limits
voltages program the sourcing and sinking current limit n
2% Current Limit Accuracy
sense thresholds with 2% accuracy. Output current may n Operates with Single or Split Supplies be boosted by adding external power transistors. n Shutdown/Enable Control Input The circuit operates with single or split power supplies n Open Collector Status Flags: from 5V to 36V total supply voltage. In normal operation, Sink Current Limit the input stage supplies and the output stage supplies are Source Current Limit connected (VCC to V+ and VEE to V–). To reduce power Thermal Shutdown dissipation it is possible to power the output stage (V+, n Fail Safe Current Limit and Thermal Shutdown V–) from independent, lower voltage rails. The amplifier is n 1.6V/µs Slew Rate unity-gain stable with a 3.6MHz gain bandwidth product n 3.6MHz Gain Bandwidth Product and slews at 1.6V/µs. The current limit circuits operate n Fast Current Limit Response: 2MHz Bandwidth with a 2MHz response between the VC n SRC or VCSNK control Specified Temperature Range: –40°C to 85°C inputs and the amplifier output. n Available in a 20-Lead TSSOP Package Open collector status flags signal current limit circuit activation, as well as thermal shutdown of the amplifier.
applicaTions
An enable logic input puts the amplifier into a low power, n Automatic Test Equipment high impedance output state when pulled low. Thermal n Laboratory Power Supplies shutdown and a ±800mA fixed current limit protect the n Motor Drivers chip under fault conditions. n Thermoelectric Cooler Driver The LT1970 is packaged in a 20-lead TSSOP package with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear a thermally conductive copper bottom plate to facilitate Technology Corporation. All other trademarks are the property of their respective owners. heat sinking.
Typical applicaTion AV = 2 Amplifier with Adjustable ±500mA Full-Scale Current Limited Sinewave Into 10
Ω
Load Current Limit and Fault Indication
VLIMIT 0V TO 5V 15V 15V V 4V LIMIT 3k IOUT(LIMIT) = ±10 • R VCC CS 2V V+ENVC V 0V V LOAD IN +IN SRC VCSNK –2V ISNK RCS ISRC IOUT 1Ω TSD 1/4W LT1970 OUT SENSE+ SENSE– V– R1 LOAD VCSRC = 4V 20µs/DIV –IN V 1970 TA02 EE 10k VC COMMON SNK = 2V RCS = 1Ω R2 10k –15V 1970 TA01 1970fe For more information www.linear.com/LT1970 1 Document Outline Description Typical Application Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Related Parts