LT2940
21
2940f
TYPICAL APPLICATIONS
AC Power and Current Monitor
Fully Isolated AC Power and Current Monitor
IMON
PMON
V
–
V
+
I
–
I
+
V
CC
V
CC
V
CC
2940 TA13
LT2940
GND
15V
10.8V 117V
T2
D2
1
500
R5
4.99k
ISOLATION
BARRIER
R4
4.22k
R12
1k
R1A
68.1
R1B
68.1
1kW/V
±853 W
PK
10A/V
±10A
PK
T1
C12
100nF
D1
5.1V
C1
47µF
25V
R
S1
4.99
R
S2
4.99
•
•
R6
10k
R7
10k
D4
D3 D5
C2
100nF
R2B
200
1%
R2A
200
1%
••
117V
“N”
117V
“L”
= 1N4148
T1 = MINNTRONIX 4810966R
T2 = 1168:108 POTENTIAL TRANSFORMER
IN CONSTRUCTING THIS CIRCUIT, THE CUSTOMER AGREES THAT, IN ADDITION TO THE TERMS AND CONDITIONS ON LINEAR TECHNOLOGY CORPORATION’S
(LTC) PURCHASE ORDER DOCUMENTS, LTC AND ANY OF ITS EMPLOYEES, AGENTS, REPRESENTATIVES AND CONTRACTORS SHALL HAVE NO LIABILITY,
UNDER CONTRACT, TORT OR ANY OTHER LEGAL OR EQUITABLE THEORY OF RECOVERY, TO CUSTOMER OR ANY OF ITS EMPLOYEES, AGENTS,
REPRESENTATIVES OR CONTRACTORS, FOR ANY PERSONAL INJURY, PROPERTY DAMAGE, OR ANY OTHER CLAIM (INCLUDING WITHOUT LIMITATION, FOR
CONSEQUENTIAL OR INCIDENTAL DAMAGES) RESULTING FROM ANY USE OF THIS CIRCUIT, UNDER ANY CONDITIONS, FORESEEABLE OR OTHERWISE.
CUSTOMER ALSO SHALL INDEMNIFY LTC AND ANY OF ITS EMPLOYEES, AGENTS, REPRESENTATIVES AND CONTRACTORS AGAINST ANY AND ALL LIABILITY,
DAMAGES, COSTS AND EXPENSES, INCLUDING ATTORNEY’S FEES, ARISING FROM ANY THIRD PARTY CLAIMS FOR PERSONAL INJURY, PROPERTY DAMAGE,
OR ANY OTHER CLAIM (INCLUDING WITHOUT LIMITATION, FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES) RESULTING FROM ANY USE OF THIS CIRCUIT,
UNDER ANY CONDITIONS, FORESEEABLE OR OTHERWISE.
7A
LOAD
IMONPMON
V
–
V
+
I
–
I
+
V
CC
2940 TA12
R
S
LT2940
GND
200m
3
R5
15k
D3
5.1V
12.6VAC
SECONDARY
k
V
=
k
I
=
200m
3
1
5
C1A
220µF
25V
T1
D1
1N4001
R2
120k
R1
30k
D2
1N4001
1A/V
±3A
PK
R4
15k
10W/V
±30W
PK
+
C1B
220µF
25V
+
R3
10
R6
1k
LOAD
k
V
=
+
++ +
=
68 1 68 1
200 200 68 1 68 1
108
1168
1
42 5
..
..
•
.
88
499 499
500
10
501
k
I
=
+
=
..
