lt2940 Linear Technology Corporation, lt2940 Datasheet - Page 21

• Manufacturer Part Number: lt2940
• Description: Power And Current Monitor
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
15V
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.
k
k
I
V
=
=
4 99 4 99
200 200 68 1 68 1
.
C12
100nF
C1
47μF
25V
500
+
+
68 1 68 1
.
.
+
+
=
R12
1k
.
501
D1
5.1V
.
10
+
.
•
117V
1168
10Ω
“L”
4.22k
108
R3
R4
4.99k
=
R5
2940 TA12
±853 W
42 5
±10A
1kW/V
10A/V
D1
1N4001
D2
1N4001
1
. 8 8
PK
PK
+
+
Fully Isolated AC Power and Current Monitor
7A
C1A
220μF
25V
C1B
220μF
25V
2940 TA13
R6
1k
PMON
IMON
V
CC
AC Power and Current Monitor
I
+
4.99Ω
D3
5.1V
R
LT2940
GND
S1
500
V
1
CC
4.99Ω
R
S2
V
GND
T1
V
V
CC
I
–
+
–
T1
±30W
10W/V
PMON
12.6VAC
SECONDARY
LT2940
PK
I
+
200mΩ
R4
15k
R
3
D2
D3
S
±3A
IMON
1A/ V
V
V
V
I
PK
CC
–
+
–
D4
D5
R5
15k
C2
100nF
= 1N4148
T1 = MINNTRONIX 4810966R
T2 = 1168:108 POTENTIAL TRANSFORMER
R1
30k
R2
120k
R6
10k
R7
10k
R1A
68.1Ω
R1B
68.1Ω
LOAD
k
k
V
I
= 200mΩ
=
1
5
200Ω
200Ω
R2A
R2B
1%
1%
3
10.8V
ISOLATION
BARRIER
•
T2
•
LT2940
117V
117V
“N”
LOAD
21
2940f