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LT1787HVIMS8 Datasheet(PDF) 6 Page - Linear Technology |
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LT1787HVIMS8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LT1787/LT1787HV Step Response at VSENSE = 128mV to –128mV 100mV –100mV 1V 0V –1V COUT = 2200pF 1787 G15 FREQUENCY (Hz) 1000 900 800 700 600 500 400 300 200 100 0 100 10k 100k 1M 1787 G16 1k VOUT ERROR LESS THAN 0.1% 0.5% 5% 2% 1% VOUT Error vs Supply Ripple Voltage (VSENSE = ±128mV) TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FIL–, FIL+ (Pins 1, 8): Negative and Positive Filter Termi- nals. Differential mode noise can be filtered by connecting a capacitor across FIL– and FIL+. Pole frequency f–3dB = 1/(2πRC), R = 1.25kΩ. VS– (Pin 2): Negative Input Sense Terminal. Negative sense voltage will result in an output sinking current proportional to the sense current. VS– is connected to an internal gain-setting resistor RG1A and supplies bias cur- rent to the internal amplifier. DNC (Pin 3): Do Not Connect. Connected internally. Do not connect external circuitry to this pin. VEE (Pin 4): Negative Supply or Ground for Single Supply Operation. VOUT (Pin 5): Voltage Output or Current Output propor- tional to the magnitude of the sense current flowing through RSENSE. For bidirectional current sensing opera- tion, VOUT = AV • VSENSE + VOUT(O) + VBIAS, where: VOUT > VBIAS for VS+ > VS– VOUT < VBIAS for VS+ < VS– VOUT(O) is the no load output voltage at VSENSE = 0V. VBIAS (Pin 6): Output Bias Pin. For single supply, bidirec- tional current sensing operation, VBIAS is connected to an external bias voltage, so that at VSENSE = 0V, VOUT = VOUT(O) + VBIAS. For dual supply, bidirectional current sensing operation, VBIAS is connected to ground. Thus, VOUT = VOUT(O) at VSENSE = 0V. VS+ (Pin 7): Positive Input Sense Terminal. Positive sense voltage will result in an output sourcing current propor- tional to the sense current. VS+ is connected to an internal gain-setting resistor RG2A. Connecting a supply to VS+ and a load to VS– will allow the LT1787 to measure its own supply current. SENSE VOLTAGE (VS + – V S –) (V) 16 14 12 10 8 6 4 2 0 –2 –4 –6 –8 0 0.8 2.0 1787 G21 –0.8 –0.4 0.4 1.2 1.6 VS – = 18V VBIAS = 0V VEE = –18V Output Voltage vs Sense Voltage |
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