LTC1921CS8 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
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LTC1921CS8 Datasheet PDF : 12 Pages
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APPLICATIO S I FOR ATIO
LTC1921
SUPPLY A
–48V
SUPPLY B
–48V
–48V
RETURN
R1 R2
100k 100k
1
VA
3
RTN
4
OUT F
8
VB
LTC1921
2
FUSE A
7
5
FUSE B OUT A
6
OUT B
F1
F2
1921 F03a
47k
5V
FUSE STATUS
MOCD207 47k
5V
SUPPLY
STATUS
R3
47k
1/4W
–48V OUT
= LOGIC COMMON
VA
OK
OK
UV OR OV
UV OR OV
VB
OK
UV OR OV
OK
UV OR OV
SUPPLY STATUS
0
1
1
1
OK: WITHIN SPECIFICATION
OV: OVERVOLTAGE
UV: UNDERVOLTAGE
VFUSE A
= VA
= VA
≠ VA
≠ VA
VFUSE B
= VB
≠ VB
= VB
≠ VB
FUSE STATUS
0
1
1
1*
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
Figure 3a. Combined Supply Status
SUPPLY A
–48V
SUPPLY B
–48V
–48V
RETURN
R1 R2
100k 100k
1
VA
3
RTN
4
OUT F
8
VB
LTC1921
2
FUSE A
7
5
FUSE B OUT A
6
OUT B
1921 F03b
47k
5V
STATUS
MOC207
LOGIC
COMMON
VFUSE A VFUSE B VA VB STATUS
= VA = VB OK OK 0
ALL OTHER CONDITIONS
1
OK: WITHIN SPECIFICATION
0: LED/PHOTODIODE ON
1: LED/PHOTODIODE OFF
R3
47k
1/4W
–48V OUT
Figure 3b. All Outputs Combined
1921f
9
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