LT2940

21

2940f

TYPICAL APPLICATIONS

AC Power and Current Monitor

Fully Isolated AC Power and Current Monitor

IMON

PMON

2940 TA13

LT2940

GND

15V

10.8V

117V

T2

D2

1

500

R5

4.99k

ISOLATION

BARRIER

R4

4.22k

R12

1k

R1A

68.1Ω

R1B

68.1Ω

1kW/ V

10A/ V

T1

C12

100nF

D1

5.1V

C1

47μF

25V

4.99Ω

4.99Ω

R6

10k

R7

10k

D4

D3

D5

C2

100nF

R2B

200Ω

1%

R2A

200Ω

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

IMON

PMON

2940 TA12

LT2940

GND

200mΩ

3

R5

15k

D3

5.1V

12.6VAC

SECONDARY

3

1

5

C1A

220μF

25V

T1

D1

1N4001

R2

120k

R1

30k

D2

1N4001

1A/V

R4

15k

10W/ V

+

C1B

220μF

25V

+

R3

10Ω

R6

1k

LOAD

+

++

+

=

68 1 68 1

200 200 68 1 68 1

108

1168

1

42 5

..

..

•

. 8

8

499

4 99

500

10

501

+

=

..