lt2940 Linear Technology Corporation, lt2940 Datasheet - Page 20

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

LT2940
TYPICAL APPLICATIONS
20
10Ω
R0
2940 TA11
C5
1μF
WIMA
2940 TA10
D1
1N4001
D2
1N4001
+
+
k
k
P
f
OUT
V
I
MAX
R4B
10k
R4A
240k
= 200mΩ
D2
=
C1A
220μF
25V
C1B
220μF
25V
=
= 10W
1
5
1000Hz
10W
R10
1k
C4
2.2nF
10V TO 40V
D3
5.1V
28V INPUT
Q4
IN
IN
HYST
REF
+
–
LTC1440
Q6
V
Q8
+
–
–
R6
1k
28V Power to Frequency Converter
Secondary-Side AC Circuit Breaker
PMON
R9
10k
V
LATCH
GND
CC
IMON
OUT
Q5
V
Q7
+
LT2940
R7
1k
I
+
200mΩ
GND
15k
R
R3
CMPOUT
CMPOUT
S
IMON
V
LATCH
CMP
CMP
CC
T1
I
–
+
V
V
R9
1M
+
1A/V
3A
1.25A
TRIP
–
+
12.6VAC
SECONDARY
I
+
LT2940
PK
200mΩ
R
GND
3
S
CMPOUT
CMPOUT
C6
100nF
I
PMON
–
D4
D3
R5, 100k
D1
10V
V
V
R4
15k
V
+
–
CC
R6, 100k
Q1
10W/ V
30W
CENTRAL SEMI
CCLM2700
V
CC
PK
R2
120k
R1
30k
V
CC
OPTO-ISOLATOR
Q2
R1A
30k
R11
10k
R12
10k
k
k
V
I
= 200mΩ
=
Q1
Q3
V
R2
120k
R1B
30k
CC
Q3
150
30
3
FDS3732
=
LOAD
2X
1
5
C7
10nF
RESISTIVE
LOAD
Q2
= 1N4148
= 2N7000
= 2N3906
2940f