MC3425 データシートの表示（PDF） - ON Semiconductor
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MC3425 Datasheet PDF : 9 Pages
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MC3425
APPLICATIONS INFORMATION
+VO
Vin
R1A
+
Power
Supply
4.5V to 40V
−
R2A
R1B
8
VCC
U.V. Fault
4 U.V.
U.V. 6 Indicator
Sense
IND
IH
MC3425
3 O.V.
Sense
O.V. 1
DRV
O.V.
U.V.
DLY Gnd DLY
R2B 2 7 5
CDLY
CDLY
Gnd
U.V. Hysteresis = IH
tDLY = 12500 CDLY
R1B R2B
R1B + R2B , VO(trip) − 2.5 V
1+
R1A
R2A
Figure 11. Overvoltage Protection and
Undervoltage Fault Indication with
Programmable Delay
AC Line
+5.0V
Power
VO = 5.0 V
VO(trip) = 6.25 V
Supply
8
15k
VCC
1.0k
4 U.V.
Sense
U.V. 6
IND
MC3425
3 O.V.
Sense
O.V. 1
DRV
Line Loss
Output
10k
O.V.
U.V.
DLY Gnd DLY
100
27 5
0.01μF
0.33μF
U.V. Sense
Pin 4
2.5V
U.V. DLY
2.5V
Pin 5
U.V. IND
OFF
Pin 6
ON
Figure 12. Overvoltage Protection of 5.0 V
Supply with Line Loss Detector
+
12V
Power
Supply
+VO
8
12k
VCC
Alarm On when:
VO = 13.6 V
3 O.V.
Sense
O.V. 1
DRV
2.7k
MC3425
4 U.V.
Sense
82k U.V. O.V.
DLY DLY Gnd
6.8k 5 2 7
100Ω
0.1μF
Gnd
Figure 13. Overvoltage Audio Alarm
Circuit
Input Signal 5.0μF
I.V. p−p
10k
10k
12V
8
VCC
3 O.V.
Sense
O.V. 1
DRV
Output Pulse when:
f(input) <
1
25000 CDLY
MC3425
1.0k
4 U.V.
Sense
U.V.
O.V.
DLY Gnd DLY
57 2
0.1μF
CDLY
O.V. Sense
Pin 3
2.5V
O.V. DLY
Pin 2
2.5V
ON
O.V. DRV
Pin 1
OFF
Figure 14. Programmable Frequency
Switch
http://onsemi.com
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