MB3761_06 Datasheet, PDF (7/15 Pages) Fujitsu Component Limited. – VOLTAGE DETECTOR

MB3761
■ APPLICATION EXAMPLES
1. Addition of Hysteresis
VCC (VIN)
R1
1
8
RL
R2
2
7
3
6
4
5
R3
VO(A)
GND
R1
1
8
R2
2
7
3
6
R3
4
5
VCC
RL
VH(B)
VO(B)
C1
GND
Note : All calculations occur with the output voltage
at 0. The hysteresis values are adjusted for
load condition and saturation voltage.
VO(A)
VIL(A)
VIH(A)
VIH(A)
=.. (1
+
R1 + R2
R3
)V R
VIL(A)
=..
(1
+
R2
R3
)V R
VH(B)
VO(B)
VIL(B)
VIH(B)
VIH(B)
.=.
(1
+
R1
R2
)V R
VIL(B) ^.=. (1 +
R1
R2 + R3
)V R
VIN (VCC)
VIH
VIH
2. Voltage Detection for Alarm
R3
R1
1
8
2
7
3
6
4
5
R2
R4
VCC
RL
VO
GND
For hysteresis, a positive feedback from pin 2 or 7 is required.
VO
VCCL
VCCH
VCCH
=
(1
+
R1
R2
)VR
VCCL
=
(1
+
R3
R4
)VR
VCCL ≥ 2.5 V
VCC
7