lt2940 Linear Technology Corporation, lt2940 Datasheet - Page 18

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

LT2940
TYPICAL APPLICATIONS
18
CURRENT
MONITOR
OUTPUT
TEMP
ADJ
1A/V
500Ω
R4
4.99k
R10
12V
R12
12k
R13
10k
LATCH
k
k
V
IMON
CMPOUT
V
I
CC
= 200mΩ
=
1
4
LT2940
8V TO 32V
GND
CMPOUT
Adjustable 0W to 10W Load Box with UVLO and Thermal Shutdown
CMP
PMON
*THERMAL SHUTDOWN; COUPLE TO Q1’s HEAT SINK
Q2
2N3904*
V
V
+
I
I
–
+
–
+
CURRENT
MONITOR
200μA/A
OUTPUT
V
12V
IMON
CC
I
LT2940
–
GND
R2
120k
R1
30k
10Ω
R14
200mΩ
R
S
PMON
I
+
V
V
2940 TA06
+
–
C4
100nF
10V TO 40V
Q1
FDB3632
8V to 32V, 8W Load
R
200mΩ
D1
1N4003
S
INPUT
R2
30k
R1
10k
R3B
91k
R3A
13k
= 50mW/μA
LM334
I
UVLO
CONTROL
R11
33Ω
2N3906
C11
10nF
12V
Q3
V
V
R3
2k
+
–
D1
1N457
R15
10k
2N3906
R
12V
Q4
R4
680Ω
C1
100nF
R16
10k
R18
1k
100Ω
R17
R5
6.8k
10Ω
C13
10nF
R6
k
k
V
I
= 200mΩ
=
12V
2940 TA07
OA
1
5
–
+
0W TO 10W ADJ
R7
6.8Ω
10W
Q1
FDB3632
10-TURN
R19
10k
LT1635
REF
+
–
200mV
2940f