Datasheet

LTC1921
9
1921f
Figure 3a. Combined Supply Status
Figure 3b. All Outputs Combined
APPLICATIO S I FOR ATIO
WUUU
MOCD207
FUSE STATUS
SUPPLY
STATUS
1921 F03a
5V
47k
5V
47k
R3
47k
1/4W
–48V OUT
OUT F
–48V
RETURN
V
A
3
4
57
2
8
1
6
V
B
FUSE A
RTN
LTC1921
FUSE B
OUT A
OUT B
SUPPLY A
–48V
SUPPLY B
–48V
R1
100k
F1
F2
R2
100k
OK: WITHIN SPECIFICATION
OV: OVERVOLTAGE
UV: UNDERVOLTAGE
0: LED/PHOTODIODE ON
1: LED/PHOTODIODE OFF
*IF BOTH FUSES (F1 AND F2) ARE OPEN,
ALL STATUS OUTPUTS WILL BE HIGH
SINCE R3 WILL NOT BE POWERED
SUPPLY STATUS
0
1
1
1
V
B
OK
UV OR OV
OK
UV OR OV
V
A
OK
OK
UV OR OV
UV OR OV
FUSE STATUS
0
1
1
1*
V
FUSE B
= V
B
≠ V
B
= V
B
≠ V
B
V
FUSE A
= V
A
= V
A
≠ V
A
≠ V
A
= LOGIC COMMON
MOC207
STATUS
1921 F03b
5V
OK: WITHIN SPECIFICATION
0: LED/PHOTODIODE ON
1: LED/PHOTODIODE OFF
47k
LOGIC
COMMON
R3
47k
1/4W
–48V OUT
OUT FV
A
3
4
57
2
8
1
6
V
B
FUSE A
RTN
LTC1921
FUSE B
OUT A
OUT B
SUPPLY A
–48V
SUPPLY B
–48V
R1
100k
–48V
RETURN
R2
100k
V
FUSE B
= V
B
V
A
OK
V
B
OK
STATUS
0
1
V
FUSE A
= V
A
ALL OTHER CONDITIONS