LT6100
9
6100fc
pin FuncTions
FuncTional DiagraM
VS– (Pin 1): Negative Sense Input Terminal. Negative
sense voltage input will remain functional for voltages
up to 48V. VS– is connected to an internal gain-setting
resistor RG1 = 5k.
VCC (Pin 2): Supply Voltage Input. This power supply pin
suppliescurrenttobothcurrentsenseamplifierandopamp.
FIL (Pin 3): Filter Pin. Connects to an external capacitor
to roll off differential noise of the system. Pole frequency
f–3dB = 1/(2πRFILC), RFIL = RE + RO = 60k.
VEE (Pin 4): Negative Supply or Ground for Single Supply
Operation.
VOUT(Pin5):VoltageOutputProportionaltotheMagnitude
of the Current Flowing Through RSENSE:
VOUT = AV (VSENSE ± VOS)
VOS is the input offset voltage. AV is the total gain of the
LT6100.
A2 (Pin 6): Gain Select Pin. Refer to Table 1.
A4 (Pin 7): Gain Select Pin. When Pin 7 is shorted to VEE,
the total gain is 40V/V. When both Pin 6 and Pin 7 are
shorted to VEE, the total gain is 50V/V. When both Pin 6
and Pin 7 are opened, the total gain is 10V/V.
VS+ (Pin 8): Positive Sense Input Terminal. Connecting a
supply to VS+ and a load to VS– will allow the LT6100 to
monitor the current through RSENSE, refer to Figure 1. VS+
is connected to an internal gain setting resistor RG2 = 5k.
VS+ remains functional for voltages up to 48V.
–
+
–
+
8
7
5
1
VS–
LOAD
RG1
5k
VCC
2.7V TO 36V
RG2
5k
VIN
(VCC + 1.4V) TO 48V
R
RO
50k
R/3
A4
6
A2
3
FIL
4
VEE
VS+
RSENSE
VOUT
6100 F01
A1
A2
Q1
VO1
RE
10k
R
25k
2
Figure 1. Functional Diagram