lt2940 Linear Technology Corporation, lt2940 Datasheet - Page 16

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

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