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XTR111AIDRCRG4 Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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XTR111AIDRCRG4 Datasheet(HTML) 11 Page - Burr-Brown (TI) |
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11 / 27 page  XTR111 SBOS375 − NOVEMBER 2006 www.ti.com 11 EXPLANATION OF PIN FUNCTIONS VIN: This input is a conventional, noninverting, high- impedance input of the internal operational amplifier (OPA). The internal circuitry is protected by clamp diodes to supplies. An additional clamp connected to approximately 18V protects internal circuitry. Place a small resistor in series with the input to limit the current into the protection if voltage can be present without the XTR111 being powered. Consider a resistor value equal to RSET for bias current cancellation. SET: The total resistance connected between this pin and VIN reference sets the transconductance. Additional series resistance can degrade accuracy and drift. The voltage on this pin must not exceed 14V because this pin is not protected to voltages above this level. IS: This output pin is connected to the transistor source of the external FET. The accuracy of the output current to IS is achieved by dynamic error correction in the current mirror. This pin should never be pulled more than 6.5V below the positive supply. An internal clamp is provided to protect the circuit, but it must be current-limited externally to less than 25mA. VG: The gate drive for the external FET is protected against shorts to the supply and GND. The circuit is clamped so that it will not drive more than 18V below the positive supply. The external FET should be protected if its gate could be externally pulled beyond its ratings. REGF: The output of the regulator buffer can source up to 5mA current, but has very limited (less than 50 µA) sinking capability. The maximum short-circuit current is in the range of 15mA to 25mA, changing over temperature. REGS: This pin is the sense input of the voltage regulator. It is referenced to an internal 3V reference circuit. The input bias current can be up to 2 µA. Avoid capacitive loading of REGS that may compromise the loop stability of the voltage regulator. VSP: The supply voltage of up to a maximum of 44V allows operation in harsh industrial environment and provides headroom for easy protection against over-voltage. Use a large enough bypass capacitor (> 100nF) and eventually a damping inductor or a small resistor (5 Ω) to decouple the XTR111 supply from the noise typically found on the 24V supplies. EF: The active low error flag (logic output) is intended for use with an external pull-up to logic-high for reliable operation when this output is used. However, it has a weak internal pull-up to 5V and can be left unconnected if not used. OD: This control input has a 4 µA internal pull-up disabling the output. A pull-down or short to GND is required to activate the output. Controlling OD reduces output glitches during power-on and power-off. This logic input controls the output. If not used, connect to GND. The regulator is not affected by OD. |
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Similar Description - XTR111AIDRCRG4 |
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