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MC3423
*
+
Vtrip + Vref 1 ) R1
[ 2.6 V 1 ) R1
F1
R1
(+ Sense
Lead)
1
R2
R2
Power
Supply
R2
2
3
4
MC3423
7 5
8
R G
To
Load
R2 ≤ 10 k W for minimum drift
For minimum value of R G , see Figure 9.
S1*
(? Sense Lead)
?
Figure 4. Basic Circuit Configuration
*See text for explanation.
(R 1 + R 2 ) 10 m F
k W
R S
(+ Sense
Lead)
R1
+
C 1 >
RS +
R S
R 1 R 2
VS – 10
25
Vtrip + Vref 1 ) R1 [ 2.6 V 1 ) R
Power
Supply
1N4740
10V
+
10 m F
15V
1
MC3423
7 5
8
2
3
4
(? Sense
Lead)
*R2
Q1
C 1
V S
To
Load
R2 R
*R2 ≤ 10 k W
Q1: V S ≤ 50 V; 2N6504 or equivalent
Q1: V S ≤ 100 V; 2N6505 or equivalent
Q1: V S ≤ 200 V; 2N6506 or equivalent
Q1: V S ≤ 400 V; 2N6507 or equivalent
Q1: V S ≤ 600 V; 2N6508 or equivalent
Q1: V S ≤ 800 V; 2N6509 or equivalent
?
Figure 5. Circuit Configuration for Supply Voltage Above 36 V
V CC
V trip
R3
+V CC
0
R1
1
6
V 10
Indication
V ref
V C
Power
Supply
2
MC3423
8
Out
R G
0
4
3
5 7
V O
R2
V C
C
V O
0
t d
V IO
R3 ≥
V trip
10 mA
t d =
V ref
I source
× C ≈ [12 × 10 3 ] C
(See Figure 10)
Figure 6. Basic Configuration for Programmable Duration
of Overvoltage Condition Before Trip
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