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LT1970 Datasheet(PDF) 8 Page - Linear Technology |
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LT1970 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 26 page  LT1970 8 1970fd For more information www.linear.com/LT1970 PIN FUNCTIONS VEE (Pins 1, 10, 11, 20, Package Base): Minus Supply Voltage. VEE connects to the substrate of the integrated circuitdie,andthereforemustalwaysbethemostnegative voltage applied to the part. Decouple VEE to ground with a low ESR capacitor. VEE may be a negative voltage or it may equal ground potential. Any or all of the VEE pins may be used. Unused VEE pins must remain open. V– (Pin 2): Output Stage Negative Supply. V– may equal VEE or may be smaller in magnitude. Only output stage current flows out of V–, all other current flows out of VEE. V– may be used to drive the base/gate of an external power devicetoboosttheamplifier’soutputcurrenttolevelsabove the rated 500mA of the on-chip output devices. Unless used to drive boost transistors, V– should be decoupled to ground with a low ESR capacitor. OUT (Pin 3): Amplifier Output. The OUT pin provides the force function as part of a Kelvin sensed load connection. OUT is normally connected directly to an external load cur- rentsenseresistorandtheSENSE+pin.Amplifierfeedback is directly connected to the load and the other end of the current sense resistor. The load connection is also wired directly to the SENSE– pin to monitor the load current. The OUT pin is current limited to ±800mA typical. This current limit protects the output transistor in the event that connections to the external sense resistor are opened or shorted which disables the precision current limit function. SENSE+ (Pin 4): Positive Current Sense Pin. This lead is normally connected to the driven end of the external sense resistor. Sourcing current limit operation is activated when the voltage VSENSE (VSENSE+ – VSENSE–) equals 1/10 of the programming control voltage at VCSRC (Pin 13). Sink- ing current limit operation is activated when the voltage VSENSE equals –1/10 of the programming control voltage at VCSNK (Pin 12). FILTER (Pin 5): Current Sense Filter Pin. This pin is normally not used and should be left open or shorted to the SENSE– pin. The FILTER pin can be used to adapt the response time of the current sense amplifiers with a 1nF to 100nF capacitor connected to the SENSE– input. An internal 1k resistor sets the filter time constant. SENSE– (Pin 6): Negative Current Sense Pin. This pin is normally connected to the load end of the external sense resistor.Sourcingcurrentlimitoperationisactivatedwhen the voltage VSENSE (VSENSE+ – VSENSE–) equals 1/10 of the programming control voltage at VCSRC (Pin 13). Sink- ing current limit operation is activated when the voltage VSENSE equals –1/10 of the programming control voltage at VCSNK (Pin 12). VCC (Pin 7): Positive Supply Voltage. All circuitry except the output transistors draw power from VCC. Total sup- ply voltage from VCC to VEE must be between 3.5V and 36V. VCC must always be greater than or equal to V+. VCC should always be decoupled to ground with a low ESR capacitor. –IN (Pin 8): Inverting Input of Amplifier. –IN may be any voltage from VEE – 0.3V to VEE + 36V. –IN and +IN remain high impedance at all times to prevent current flow into the inputs when current limit mode is active. Care must be taken to insure that –IN or +IN can never go to a volt- age below VEE – 0.3V even during transient conditions or damage to the circuit may result. A Schottky diode from VEE to –IN can provide clamping if other elements in the circuit can allow –IN to go below VEE. +IN(Pin9):NoninvertingInputofAmplifier.+INmaybeany voltage from VEE – 0.3V to VEE + 36V. –IN and +IN remain high impedance at all times to prevent current flow into the inputs when current limit mode is active. Care must be taken to insure that –IN or +IN can never go to a volt- age below VEE – 0.3V even during transient conditions or damage to the circuit may result. A Schottky diode from VEE to +IN can provide clamping if other elements in the circuit can allow +IN to go below VEE. |
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Similar Description - LT1970_15 |
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