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LT1787CS8 Datasheet(PDF) 9 Page - Linear Technology

Part # LT1787CS8
Description  Precision, High Side Current Sense Amplifiers
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1787CS8 Datasheet(HTML) 9 Page - Linear Technology

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LT1787/LT1787HV
1787fc
PIN FUNCTIONS
FIL, FIL+ (Pins 1, 8): Negative and Positive Filter Termi-
nals. Differential mode noise can be filtered by connecting
a capacitor across FILand 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.
BLOCK DIAGRAM
RSENSE
1787 F 01
RG2A
1.25k
RG2B
1.25k
RG1A
1.25k
RG1B
1.25k
VOUT
IOUT
VBIAS
ROUT
20k
VS
+
A1
Q1
Q2
CURRENT MIRROR
VEE
FIL
VS
+
FIL+
ISENSE
Figure 1. LT1787 Functional Diagram


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