Datasheet

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