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參數(shù)資料
| 型號： | X80073 |
| 廠商： | Intersil Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Hot Swap Controller with Advanced Fault Protection and Voltage Refulator Output |
| 中文描述： | 熱插拔控制器與先進(jìn)的故障保護(hù)和輸出電壓Refulator |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 279K |
| 代理商： | X80073 |
10
FN8150.0
March 15, 2005
Figure 6. Typical -48V Hotswap Application circuit
Overvoltage and Undervoltage Shutdown
The X80070 provides overvoltage and undervoltage protection
circuits.
When an overvoltage (V
OV
) or undervoltage (V
UV1
and V
UV2
)
condition is detected, the GATE pin immediately pulls low
turning off the supply to the system. The undervoltage
threshold V
UV1
applies to the normal operation with a main
supply. The undervoltage threshold V
UV2
assumes the system
is powered by a battery. When using a battery backup, the
BATT-ON pin is pulled to V
RGO
. The default thresholds have
been set so the external resistance values in Figure 6 provide
an overvoltage threshold of 74.9V (X80070 and X80072) or
68V (X80071 and X80073), a main undervoltage threshold of
43V and a battery undervoltage threshold of 33.8V.
As shown in Figure 9, this circuit block contains comparators
and voltage references to monitor for a single overvoltage and
dual undervoltage trip points. The overvoltage and undervoltage
trip points as shown in Table 1 below.
Table 1.
Overvoltage/Undervoltage default thresholds
A resistor divider connected between the plus and minus input
voltages and the V
UV/OV
pin (see Figure 7) determines the
overvoltage and undervoltage shutdown voltages and the
operating voltage range. Using the thresholds in Table 1 and
the equations of Figure 7 the desired operating voltage can be
determined. Figure 8 shows the resistance values for various
operating voltages (X80070 and X80072).
Figure 7. Overvoltage Undervoltage Divider
Figure 8. Operating voltage vs. resistor ratio
Battery back up operations
An external signal, BATT-ON is provided to switch the
undervoltage trip point. The BATT-ON signal is a LOGIC HIGH
if V
IHB
> V
EE
+ 4V and is a LOGIC LOW if V
ILB
< V
EE
+ 2V. The
time from a BATT-ON input change to a valid new undervoltage
threshold is 100ns. See Electrical Specifications for more
details.
Note: The V
UV/OV
pin must be limited to less than V
EE
+ 5.5V.
in worst case conditions. Values for R1 and R2 must be chosen
such that this condition is met. Intersil recommends
R1 = 182k
and R2 = 10k
to conform to factory settings.
These should be 1% resistors.
Table 2.
Selecting between Undervoltage Trip Points
Threshold
Symbol
V
OV
Description
Overvoltage
(X80070/72)
Overvoltage
(X80071/73)
Undervoltage 1 2.21V 2.24V
Undervoltage 2 1.73V 1.76V
falling rising
3.87V
Max/Min
Voltage
1
Lockout
Voltage
2
74.9
3.9V
74.3
V
OV
3.51V 3.54V
67.4
68
V
UV1
V
UV2
Notes:
43.0
33.8
42.4
33.2
1: Max/Min Voltage is the maximum and mimimum
operating voltage assuming the recommended V
UV/OV
resistor divider.
2: Lockout voltage is the voltage where the X8007x turns
off the FET.
V
DD
X80070
V
UV/OV
OV=75V/72V
V
EE
SENSE
-48V
Return
UV=43V
-48V
GATE
Rs
0.02
5%
R4
182K
1%
R5
30K
1%
R6
10K
1%
Q1
IRFR120
-48V
DC/DC
Converter
I
inrush
PWRGD
ON/OFF
V
RGO
100n
100
22K
3.3n
100uF
10K
Pin
Description
Trip Point Selection
If BATT-ON = 0,
V
UV1
trip point is selected;
If BATT-ON = 1,
V
UV2
trip point is selected.
BATT-ON Undervoltage
Trip Point
Selection Pin
V
UV1
and V
UV2
are undervoltage thresholds.
R1
R2
V
P
V
UV/OV
V
N
Voltage divider:
or:
V
UV OV
V
S
+
R1
R2
-------R2
=
V
S
V
UV OV
----------+
=
V
S
BATT-ON = V
EE
V
OV
V
UV1
V
UV2
Operating
Voltage
BATT-ON = V
RGO
100
90
80
70
60
50
40
30
20
10
0
1
1
1
1
1
1
1
2
2
2
O
R1 in k
(for R2=10K)
X80070, X80071, X80072, X80073
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