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LT1970 Datasheet(PDF) 1 Page - Linear Technology |
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LT1970 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LT1970 1970fb 500mA Power Op Amp with Adjustable Precision Current Limit ■ ±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 ■ 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 ■ Automatic Test Equipment ■ Laboratory Power Supplies ■ Motor Drivers ■ Thermoelectric Cooler Driver AV = 2 Amplifier with Adjustable ±500mA Full-Scale Current Limit and Fault Indication Current Limited Sinewave Into 10 Ω Load VCC COMMON VEE V+ EN V– VCSRC VCSNK ISNK ISRC SENSE– SENSE+ TSD IOUT OUT RCS 1 Ω 1/4W 3k +IN 15V LT1970 –15V 15V –IN LOAD R1 10k R2 10k 1970 TA01 VLIMIT 0V TO 5V VIN VLIMIT 10 • RCS IOUT(LIMIT) = ± 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. The circuit operates with single or split power supplies from 5V to 36V total supply voltage. In normal operation, the input stage supplies and the output stage supplies are con- nected (VCC to V+ and VEE to V–). To reduce power dissi- pation it is possible to power the output stage (V+, V–) from independent, lower voltage rails. The amplifier is unity-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 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 shut- down and a ±800mA fixed current limit protect the chip under fault conditions. The LT1970 is packaged in a 20-lead TSSOP package with a thermally conductive copper bottom plate to facilitate heat sinking. VLOAD 4V 2V 0V –2V VCSRC = 4V 20 µs/DIV 1970 TA02 VCSNK = 2V RCS = 1Ω DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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