Motorola MC3423P1, MC3423DR2, MC3423D Datasheet
Order this document by MC3423/D
This overvoltage protection circuit (OVP) protects sensitive electronic
circuitry from overvoltage transients or regulator failures when used in
conjunction with an external “crowbar” SCR. The device senses the
overvoltage condition and quickly “crowbars” or short circuits the supply,
forcing the supply into current limiting or opening the fuse or circuit breaker.
The protection voltage threshold is adjustable and the MC3423 can be
programmed for minimum duration of overvoltage condition before tripping,
thus supplying noise immunity .
The MC3423 is essentially a “two terminal” system, therefore it can be
used with either positive or negative supplies.
MAXIMUM RATINGS
Rating Symbol Value Unit
Differential Power Supply Voltage VCC–V
Sense Voltage (1) V
Sense Voltage (2) V
Remote Activation Input Voltage V
Output Current I
Operating Ambient Temperature Range T
Operating Junction Temperature T
Storage Temperature Range T
Sense1
Sense2
act
O
A
stg
EE
J
40 Vdc
6.5 Vdc
6.5 Vdc
7.0 Vdc
300 mA
0 to +70 °C
125 °C
–65 to +150 °C
OVERVOLTAGE
SENSING CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
P1 SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
8
1
PIN CONNECTIONS
CASE 751
(SOP–8)
Simplified Application
V
in
Current
Limited
DC
Power
Supply
+
C
out
O. V. P.
MC3423
MOTOROLA ANALOG IC DEVICE DATA
1
CC
Sense 1
Sense 2
V
out
2
3
Current
45
Source
(Top View)
Drive
8V
Output
7
V
EE
Indicator
6
Output
Remote
Activation
ORDERING INFORMATION
Operating
Device
MC3423D
MC3423P1
Motorola, Inc. 1996 Rev 1
Temperature Range
TA = 0° to +70°C
Package
SO–8
Plastic DIP
1
MC3423
ELECTRICAL CHARACTERISTICS
Characteristics Symbol Min Typ Max Unit
Supply Voltage Range VCC–V
Output Voltage
(IO = 100 mA)
Indicator Output Voltage
(I
= 1.6 mA)
O(Ind)
Sense Trip V oltage
(TA = 25°C)
Temperature Coefficient of V
(Figure 2)
Remote Activation Input Current
(VIH = 2.0 V, VCC – VEE = 5.0 V)
(VIL = 0.8 V, VCC – VEE = 5.0 V)
Source Current I
Output Current Risetime
(TA = 25°C)
Propagation Delay Time
(TA = 25°C)
Supply Current I
NOTES: T
low
to T
= 0° to +70°C
high
Sense1
(5.0 V ≤ VCC – VEE ≤ 36 V, T
< TA , T
low
VOL(Ind) – 0.1 0.4 Vdc
V
Sense1,
V
Sense2
TCV
Source
, unless otherwise noted.)
high
EE
V
O
S1
I
IH
I
IL
t
r
t
pd
D
4.5 – 40 Vdc
VCC–2.2 VCC–1.8 – Vdc
2.45 2.6 2.75 Vdc
– 0.06 – %/°C
–
–
0.1 0.2 0.3 mA
– 400 – mA/µs
– 0.5 – µs
– 6.0 10 mA
5.0
–120
40
–180
µA
Figure 1. Representative Block Diagram
V
1
CC
I
Sense 1
Source
2
V
ref
2.6V
–
–+
+
+
V
EE
Sense 2
–
6537
Remote
Activation
Indicator
Output
4
Current
Source
8
Output
Figure 2. Sense V oltage Test Circuit
V
CC
Switch 1
(A)
(B)
Switch 2
V
I
2
3
4
1
MC3423
75
8
V
V
Sense 1
V
Sense 2
Ramp VI until output goes high; this is
the V
Sense
Switch 1 Switch 2
Position A
Position B
threshold.
Closed
Open
2
MOTOROLA ANALOG IC DEVICE DATA
MC3423
Figure 3. Basic Circuit Configuration
Power
Supply
Power
Supply
F1
1N4740
10V
*
(+ Sense
R1
R2
Lead)
2
3
4
1
MC3423
75
(– Sense Lead)
8
R
G
S1*
+
R1
ǒ
V
+
V
trip
ref
R2 ≤ 10 kΩ for minimum drift
To
Load
–
For minimum value of RG, see Figure 9.
*See text for explanation.
Ǔ
1
)
[
2.6 Vǒ1
R2
R1
Ǔ
)
R2
Figure 4. Circuit Configuration for Supply Voltage Above 36 V
Q1
+
To
Load
V
S
C
1
–
(+ Sense
R
S
1
MC3423
+
µ
F
10
15V
75
Lead)
R1
8
2
3
4
*R2
(– Sense
Lead)
R
S
C1 >
RS+
V
trip
*R2 ≤ 10 k
Q1: VS ≤ 50 V; 2N6504 or equivalent
Q1: VS
Q1: VS
Q1: VS
Q1: V
S
Q1: VS
(R1 + R2) 10
R1R
2
V
S–10
ǒ
25
ǒ
+
V
1
)
ref
Ω
≤
100 V; 2N6505 or equivalent
≤
200 V; 2N6506 or equivalent
≤
400 V; 2N6507 or equivalent
≤
600 V; 2N6508 or equivalent
≤
800 V; 2N6509 or equivalent
µ
F
Ǔ
k
W
R1
Ǔ
[
2.6 Vǒ1
R2
R1
Ǔ
)
R2
Figure 5. Basic Configuration for Programmable Duration
Power
Supply
R1
2
R2
1
6
MC3423
4753
C
R3
≥
C
V
trip
10 mA
V
MOTOROLA ANALOG IC DEVICE DATA
of Overvoltage Condition Before Trip
V
CC
V
trip
+V
R3
V
10
Indication
Out
8
R
G
V
O
CC
0
V
C
V
ref
0
V
O
0
V
IO
td =
I
source
t
d
V
ref
×
C ≈ [12 × 103] C (See Figure 10)
3
Loading...