Datasheet

LT6100
9
6100fc
pin FuncTions
FuncTional DiagraM
V
S
–
(Pin 1): Negative Sense Input Terminal. Negative
sense voltage input will remain functional for voltages
up to 48V. V
S
–
is connected to an internal gain-setting
resistor R
G1
= 5k.
V
CC
(Pin 2): Supply Voltage Input. This power supply pin
supplies current to both current sense amplifier and op amp.
FIL (Pin 3): Filter Pin. Connects to an external capacitor
to roll off differential noise of the system. Pole frequency
f
–3dB
= 1/(2πR
FIL
C), R
FIL
= R
E
+ R
O
= 60k.
V
EE
(Pin 4): Negative Supply or Ground for Single Supply
Operation.
V
OUT
(Pin 5): Voltage Output Proportional to the Magnitude
of the Current Flowing Through R
SENSE
:
V
OUT
= A
V
• (V
SENSE
± V
OS
)
V
OS
is the input offset voltage. A
V
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 V
EE
,
the total gain is 40V/V. When both Pin 6 and Pin 7 are
shorted to V
EE
, the total gain is 50V/V. When both Pin 6
and Pin 7 are opened, the total gain is 10V/V.
V
S
+
(Pin 8): Positive Sense Input Terminal. Connecting a
supply to V
S
+
and a load to V
S
–
will allow the LT6100 to
monitor the current through R
SENSE
, refer to Figure 1. V
S
+
is connected to an internal gain setting resistor R
G2
= 5k.
V
S
+
remains functional for voltages up to 48V.
–
+
–
+
8
7
5
1
V
S
–
LOAD
R
G1
5k
V
CC
2.7V TO 36V
R
G2
5k
V
IN
(V
CC
+ 1.4V) TO 48V
R
R
O
50k
R/3
A4
6
A2
3
FIL
4
V
EE
V
S
+
R
SENSE
V
OUT
6100 F01
A1
A2
Q1
V
O1
R
E
10k
R
25k
2
Figure 1. Functional Diagram