Datasheet LT6100 (Analog Devices) - 12
| Fabricante | Analog Devices |
| Descripción | Precision, Gain Selectable High Side Current Sense Amplifier |
| Páginas / Página | 18 / 12 — APPLICATIONS INFORMATION. Noise Filtering. Sense Input Signal Range. … |
| Formato / tamaño de archivo | PDF / 1.5 Mb |
| Idioma del documento | Inglés |
APPLICATIONS INFORMATION. Noise Filtering. Sense Input Signal Range. Output Signal Range. Figure 2. VOS vs VS Input Voltage
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LT6100
APPLICATIONS INFORMATION Noise Filtering
an amplified, level shifted representation of the RSENSE The LT6100 provides signal filtering via pin FIL that is voltage is developed at VOUT . The output is well behaved internally connected to the resistors R driving capacitive loads to 1000pF. E and RO. This pin may be used to filter the input signal entering the LT6100’s
Sense Input Signal Range
internal op amp, and should be used when fast ripple cur- rent or transients flow through the sense resistor. High The LT6100 has high CMRR over the wide input voltage frequency signals above the 300kHz bandwidth of the range of 4.1V to 48V. The minimum operation voltage of LT6100’s internal amplifier will cause errors. A capacitor the sense amplifier input is 1.4V above VCC. The output connected between FIL and VEE creates a single pole low remains accurate even when the sense inputs are driven pass filter with corner frequency: to 48V. Figure 2 shows that VOS changes very slightly over a wide input range. Furthermore, the sense inputs f–3dB = 1/(2πRFILC) V + – S and VS can collapse to zero volts without incurring where RFIL = 60k. A 220pF capacitor creates a pole at any damage to the device. The LT6100 can handle dif- 12kHz, a good choice for many applications. ferential sense voltages up to the voltage of the sense inputs supplies. For example, V + – S = 48V and VS = 0V can
Output Signal Range
be a valid condition in a current monitoring application The LT6100’s output signal is developed by current through (Figure 3) when an overload protection fuse is blown and R V – voltage collapses to ground. Under this condition, the G2 into output resistor RO. The current is VSENSE/RG2. The S sense amplifier output, V output of the LT6100 goes to the positive rail, V O1, is buffered by the internal op OH. There amp so that connecting the output pins to other systems will is no phase inversion to cause an erroneous output signal. preserve signal accuracy. For zero V For the opposite case when V + collapse to ground with SENSE, internal circuit S saturation with loss of accuracy occurs at the minimum V – S held up at some higher voltage potential, the output V will sit at V OUT swing, 15mV above VEE. VOUT may swing positive OL. If both inputs fall below the minimum CM to within 75mV of V voltage, V CC or a maximum of 36V, a limit set CC + 1.4V, the output is indeterminate but the by internal junction breakdown. Within these constraints, LT6100 will not be damaged. 1.5 V TO LOAD SENSE = 100mV RSENSE FUSE 1.0 V DC CC = 3V SOURCE 0.5 TA = 25°C C1 1 8 0.1µF 0 V – + S VS –0.5 2 7 VCC A4 –1.0 + C2 5V – + –1.5 0.1µF 3 6 –2.0 FIL A2 INPUT OFFSET VOLTAGE (mV) –2.5 –3.0 4 OUT 5 V OUTPUT –3.5 EE 0 10 20 30 40 50 LT6100 VS INPUT VOLTAGE (V) 6100 F03 6100 F02
Figure 2. VOS vs VS Input Voltage Figure 3. Current Monitoring of a Fuse Protected Circuit
6100fd 12 For more information www.linear.com/LT6100
APPLICATIONS INFORMATION Noise Filtering
an amplified, level shifted representation of the RSENSE The LT6100 provides signal filtering via pin FIL that is voltage is developed at VOUT . The output is well behaved internally connected to the resistors R driving capacitive loads to 1000pF. E and RO. This pin may be used to filter the input signal entering the LT6100’s
Sense Input Signal Range
internal op amp, and should be used when fast ripple cur- rent or transients flow through the sense resistor. High The LT6100 has high CMRR over the wide input voltage frequency signals above the 300kHz bandwidth of the range of 4.1V to 48V. The minimum operation voltage of LT6100’s internal amplifier will cause errors. A capacitor the sense amplifier input is 1.4V above VCC. The output connected between FIL and VEE creates a single pole low remains accurate even when the sense inputs are driven pass filter with corner frequency: to 48V. Figure 2 shows that VOS changes very slightly over a wide input range. Furthermore, the sense inputs f–3dB = 1/(2πRFILC) V + – S and VS can collapse to zero volts without incurring where RFIL = 60k. A 220pF capacitor creates a pole at any damage to the device. The LT6100 can handle dif- 12kHz, a good choice for many applications. ferential sense voltages up to the voltage of the sense inputs supplies. For example, V + – S = 48V and VS = 0V can
Output Signal Range
be a valid condition in a current monitoring application The LT6100’s output signal is developed by current through (Figure 3) when an overload protection fuse is blown and R V – voltage collapses to ground. Under this condition, the G2 into output resistor RO. The current is VSENSE/RG2. The S sense amplifier output, V output of the LT6100 goes to the positive rail, V O1, is buffered by the internal op OH. There amp so that connecting the output pins to other systems will is no phase inversion to cause an erroneous output signal. preserve signal accuracy. For zero V For the opposite case when V + collapse to ground with SENSE, internal circuit S saturation with loss of accuracy occurs at the minimum V – S held up at some higher voltage potential, the output V will sit at V OUT swing, 15mV above VEE. VOUT may swing positive OL. If both inputs fall below the minimum CM to within 75mV of V voltage, V CC or a maximum of 36V, a limit set CC + 1.4V, the output is indeterminate but the by internal junction breakdown. Within these constraints, LT6100 will not be damaged. 1.5 V TO LOAD SENSE = 100mV RSENSE FUSE 1.0 V DC CC = 3V SOURCE 0.5 TA = 25°C C1 1 8 0.1µF 0 V – + S VS –0.5 2 7 VCC A4 –1.0 + C2 5V – + –1.5 0.1µF 3 6 –2.0 FIL A2 INPUT OFFSET VOLTAGE (mV) –2.5 –3.0 4 OUT 5 V OUTPUT –3.5 EE 0 10 20 30 40 50 LT6100 VS INPUT VOLTAGE (V) 6100 F03 6100 F02
Figure 2. VOS vs VS Input Voltage Figure 3. Current Monitoring of a Fuse Protected Circuit
6100fd 12 For more information www.linear.com/LT6100