Datasheet

 2017-2018 Microchip Technology Inc. DS20005757B-page 21
LM4040/LM4041
FIGURE 5-7: Floating Current Detector.
FIGURE 5-8: Current Source.
FIGURE 5-9: Precision Floating Current Detector.
* D1 can be any LED, V
F
= 1.5V to 2.2V at 3mA. D1 may act as an indicator.
D1 will be on if I
THRESHOLD
falls below the threshold current, except with I = O.
0 to 20mA
R1
390Ω
± 2%
1N4002
D2
LM4041-ADJ
+
–
FB
λ
D1* 1
2
3
6
5
4
4N28
N.C.
I
THRESHOLD
= + = 3.2mA
1.24V
R1
5A
4N28 GAIN
N.C.
R2
470k
CMOS
+ 5V
+15V
R1
2N2905
2N
3964
R2
120k
LM4041-ADJ
FB
+
–
1.24V
R1
I
OUT
=
1A < I
OUT
= 100mA
* D1 can be any LED, V
F
= 1.5V to 2.2V at 3mA. D1 may act as an indicator.
D1 will be on if I
THRESHOLD
falls below the threshold current, except with I = O.
+5V
R3
100k
CMOS
R4
10M
1
2
3
6
5
4
4N28
N.C.
R2
22k
LM4041-ADJ
+
–
R1
332Ω
±1%
FB
1N914
2N2222
D1*
λ
I
THRESHOLD
= = 3.7mA ± 2%
1.24V
R1
D2
1N4002
0 to 20 mA