Datasheet

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