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U 3 _ I _ L I M IT_REF
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U 3 _ P H C _ I S
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U3_I_S_DCB
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Figure A-11. PRIMARY AND SECONDARY 3-PHASE OVER-CURRENT SENSE
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PHASE A CURRENT
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FAULT SENSE A1
U 3 A
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P _ P H A_IS
1
2
-
LM393
+3.3V
R 1 2
1M
PRIMARY UNI-3
PHASE B CURRENT
+5.0V
R 1 4
5.1K
FAULT SENSE A2
U 4 A
3
+
1
F A U LTA2
2
-
LM393
R 2 0
1M
+3.3V
PRIMARY UNI-3
PHASE C CURRENT
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R 2 2
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FAULT SENSE A3
U 4 B
5
+
7
F A U LTA3
6
-
LM393
PRIMARY UNI-3
R 3 0
1M
DC BUS OVER-CURRENT
FAULT SENSE A1
+3.3V
+5.0V
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P _ P H A_IS
1
U 3 B
5
+
2
P _ O I _FAULT
7
3
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LM393
PRIMARY UNI-3
PHASE A CURRENT/DC BUS CURRENT
FAULT SENSE A1
B
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S U 3 _ P HB_IS
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SU3_I_LIMIT_REF
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S U 3 _ P H C _ IS
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C 1 4
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F A U LTA1
R 3 7
S E C _ O V ER_I_LIMIT
10K
Title
PRIMARY AND SECONDARY 3-PHASE OVER CURRENT SENSE
Document
Size
Number
B
Date:
Monday, October 16, 2000
C
D
R 5
1M
+3.3V
+5.0V
SECONDARY UNI-3
PHASE A CURRENT
R 7
5.1K
FAULT SENSE B1
U 6 A
3
+
S _ P H A_IS
1
R 1 1
2
-
LM393
16K
+3.3V
R 1 3
1M
SECONDARY UNI-3
PHASE B CURRENT
+5.0V
R 1 5
5.1K
FAULT SENSE B2
U 5 A
3
+
1
F A U LTB2
2
-
LM393
16K
R 2 1
1M
+3.3V
SECONDARY UNI-3
PHASE C CURRENT
+5.0V
R 2 3
5.1K
FAULT SENSE B3
U 5 B
5
+
7
R 2 7
F A U LTB3
6
-
LM393
16K
SECONDARY UNI-3
R 3 3
1M
DC BUS OVER-CURRENT
FAULT SENSE B1
+ 3 .3V
+ 5 .0V
R 3 5
5.1K
S _ P H A_IS
U 6 B
5
+
S _ O I _ FAULT
7
6
-
LM393
SECONDARY UNI-3
PHASE A CURRENT/DC BUS CURRENT
FAULT SENSE B1
DSP Standard Products Division
2100 East Elliot Road
Tempe, Arizona 85284
(480) 413-5090
63A10516S
Designer:
DSPD Design
D
E
4
3
2
J G 2
1
2
F A ULTB1
3
1
FAX: (480) 413-2510
Rev.
1.0
Sheet
of
11
18
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