AMI 420 - Figure A-1 Example External Circuitry for Quench Input;Output

110 Rev. 7
Appendix
Quench I/O Connector
Quench External Input (4N35 optocoupler input):
Maximum optocoupler input LED forward voltage @ 10mA (V
f
, across rated temperature) 1.7V
Minimum on-state optocoupler input LED forward current (I
f
, across rated temperature) 10mA
Maximum off-state optocoupler input LED forward current (I
f
, across rated temperature) 10µA
Maximum allowable optocoupler input LED forward current (I
f
, across rated temperature) 30mA
Maximum allowable optocoupler input LED reverse voltage (V
r
, across rated temperature) 6V
Galvanic isolation voltage from quench external input to earth ground 500VDC
Quench External Output (4N35 optocoupler output):
Maximum on-state optocoupler output saturation voltage @ 0.5 mA out (V
ce-sat
, across rated temp.) 0.35V
Maximum off-state optocoupler output leakage current (I
ceo
, across rated temperature) 2.5µA
Maximum allowable off-state optocoupler output voltage (V
ceo
, across rated temperature) 30V
Maximum allowable optocoupler output reverse voltage (V
eco
, across rated temperature) 7V
Galvanic isolation voltage from quench external output to earth ground 500VDC
+5V
+5V
MODEL 420EXTERNAL CIRCUITRY
J4
9-PIN FEMALE
5
9
4
8
3
7
2
6
1
4N35
1
2
5
4
6
4N35
1
2
5
4
6
9-PIN MALE
5
9
4
8
3
7
2
6
1
U?A
74AC04
1 2
U?A
74AC04
12
10K
220
Figure A-1. Example external circuitry for quench input/output.