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參數(shù)資料
| 型號： | LTC1921IMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Dual .48V Supply and Fuse Monitor |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 177K |
| 代理商： | LTC1921IMS8 |
7
LTC1921
1921i
internal impedance to the return (RTN) pin. The applica-
tion must be designed so that an open fuse condition will
force the fuse input (FUSE A or FUSE B) to be outside the
specified window around the supply pins, such as with a
weak pull-up resistor to RTN, so that the LTC1921 can
properly indicate a fault at OUT F. If supply diodes that
exhibit high reverse leakage, such as Schottky diodes, are
used, then the values of the pull-up resistors must be
reduced accordingly.
The FUSE A and FUSE B pins may also be used in
conjunction with V
A
and V
B
for simple window compari-
son, provided that one of the circuit nodes to be compared
can provide the small amount of supply current required to
bias the IC. The LTC1921 is ideally suited for comparison
functions in a circuit where only high supply voltages are
available.
Output Pins
The output pins in the LTC1921 are designed to shunt
external optocoupler diodes or LEDs during a supply or
fuse fault condition. Up to three diodes may be used in
series, one for each output. In this configuration
(Figure2), a diode connected between OUT F and RTN will
indicate the condition of both fuses. A diode connected
between OUT A and OUT F will indicate the condition of
supply A (V
A
) and a diode connected between OUT B and
OUT A will indicate the condition of supply B (V
B
). A
resistor connected from OUT B to the negative supply is
required to bias the diodes. The LTC1921 is designed to
allow the current from this resistor to flow through the
diodes during normal supply conditions and intact fuses,
and will shunt this current away from the proper diodes
during a fault condition. These diodes will further clamp
the output pin potentials to RTN in order to keep the
outputs within rated voltages. If LEDs are used instead of
optocouplers, they should be green since they will be lit
when the supplies are within the proper voltage range.
The LTC1921 may be connected in such a way as to OR
various outputs to allow the use of fewer optocouplers or
LEDs (Figures 3a and 3b). One and two diode circuits are
shown.
APPLICATIOU
W
U
U
MOC207
MOC207
MOC207
FUSE
STATUS
SUPPLY A
STATUS
1921 F02
5V
SUPPLY B
STATUS
47k
5V
47k
5V
47k
R3
47k
1/4W
OK: WITHIN SPECIFICATION
OV: OVERVOLTAGE
UV: UNDERVOLTAGE
–48V OUT
= LOGIC COMMON
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
OUT F
–48V
RETURN
V
A
3
4
5
7
2
8
1
6
V
B
FUSE A
F1
D1
D2
F2
RTN
LTC1921
FUSE B
OUT A
OUT B
SUPPLY A
–48V
SUPPLY B
–48V
R1
100k
R2
100k
SUPPLY A
STATUS
0
0
1
1
V
B
OK
UV OR OV
OK
UV OR OV
V
A
OK
OK
UV OR OV
UV OR OV
SUPPLY B
STATUS
0
1
0
1
FUSE STATUS
0
1
1
1*
FUSE B
= V
B
≠
V
B
= V
B
≠
V
B
FUSE A
= V
A
= V
A
≠
V
A
≠
V
A
Figure 2
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