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LT1999 Datasheet(PDF) 10 Page - Linear Technology |
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LT1999 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LT1970A 10 1970afa BLOCK DIAGRAM AND TEST CIRCUIT APPLICATIONS INFORMATION The LT1970A power op amp with precision controllable current limit is a flexible voltage and current source module. The drawing on the front page of this data sheet is representative of the basic application of the circuit, however many alternate uses are possible with proper understanding of the subcircuit capabilities. CIRCUIT DESCRIPTION Main Operational Amplifier Subcircuit block GM1, the 1X unity-gain current buffer and output transistors Q1 and Q2 form a standard op- erational amplifier. This amplifier has ± 500mA current output capability and a 3.6MHz gain-bandwidth product. Most applications of the LT1970A will use this op amp in the main signal path. All conventional op amp circuit configurations are supported. Inverting, noninverting, filter, summation or nonlinear circuits may be implemented in a conventional manner. The output stage includes current limiting at ±800mA to protect against fault conditions. The input stage has high differential breakdown of 36V minimum between –IN and +IN. No current will flow at the inputs when differential input voltage is present. This feature is important when the precision current sense amplifiers “ISINK” and “ISRC” become active. Current Limit Amplifiers Amplifier stages “ISINK” and “ISRC” are very high transcon- ductance amplifier stages with independently controlled offset voltages. These amplifiers monitor the voltage between input pins SENSE+ and SENSE– which usually sense the voltage across a small external current sense resistor. The transconductance amplifiers outputs con- nect to the same high impedance node as the main input stage GM1 amplifier. Small voltage differences between SENSE+ and SENSE–, smaller than the user set VCSNK/10 3 19 7 9 8 17 16 18 15 12 13 – + ISNK 1970ATC RFIL 1k RCS 1Ω RLOAD 1k ISRC D2 D1 1 Q1 Q2 4 5 6 2 GM1 ENABLE COMMON VCSRC VCSRC VCSNK 5V 15V VCSNK ISRC ISNK –IN VIN RG 1k +IN ENABLE TSD 14 VCC V+ 15V –15V OUT SENSE+ FILTER SENSE– V– VEE 1, 10, 11, 20 10k 10k 10k RF 1k VSRC + – VSNK + – + – |
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