Datasheet

LT2940
16
2940f
TYPICAL APPLICATIONS
120W Supply Monitor Includes I
CC
of LT2940
CMP
+
PMON IMON
CMPOUT
CMPOUT
LATCH
V
–
V
+
I
–
I
+
2940 TA02
V
CC
R2
140k
LOAD
R1
10.0k
5mA
MAX
0A TO 4A
V
PMON
R4
13.7k
R3
6.19k
OVP
SUPPLY
30V TO 80V
100V (MAX)
OVERPOWER (OVP) GOES HIGH
WHEN SUPPLY POWER > 120W
R
S
LT2940
GND
R12
3.9k
1/8W
50m
1W
V
LOGIC
R14
3.9k
SCALE = 30
120W FULL-SCALE
W
V
k
V
=
k
I
= 50m
1
15
12.5W PWM Heat Source
CMP
+
IMONPMON
CMPOUT
CMPOUT
LATCH
V
–
V
+
I
–
I
+
V
CC
2940 TA03
R2
102k
R1
25.5k
Q1
FDS3672
INPUT
9.5V TO 14.5V
R
S
LT2940
GND
200m
3
R4
15.0k
C4
4.7µF
* SEVEN 50, 5W RESISTORS IN PARALLEL.
MULTIPLE UNITS FACILITATE SPREADING HEAT.
C1
100µF
25V
k
V
=
k
I
=
t
OFF
z1.7ms
200m
3
1
5
HEATSINK
Q = 12.5W
R6
10k
R5
10k
Q3
2N3906
Q2
TP0610
R7*
7
D1
1N5819
+