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PI2121 Datasheet(PDF) 15 Page - Vicor Corporation

Part # PI2121
Description  8 Volt, 24 Amp Full-Function Active ORing Solution
PDF  21 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

PI2121 Datasheet(HTML) 15 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2121
Rev. 1.2 Page 15 of 21
OV/UV resistor selection:
The UV and OV comparator inputs are used to
monitor the input voltage and will indicate a fault
condition when this voltage is out of range. The UV
& OV pins can be configured in two different ways,
either with a divider on each pin, or with a three-
resistor divider to the same node, enabling the
elimination of one resistor. Under-voltage is
monitored by the UV pin input and over-voltage is
monitored with the OV pin input.
The Fault pin (
FT ) will indicate a fault (active low)
when the UV pin is below the threshold or when the
OV pin is above the threshold. The threshold is
0.50V typical with 25mV hysteresis and the input
current is less than ±1µA. It is important to consider
the maximum current that will flow in the resistor
divider and maximum error due to UV and OV input
current. Set the resistor current to 100µA or higher
to maintain better than 1% accuracy for UV and OV
due to the bias current.
The three-resistor voltage divider configuration for
both UV and OV to monitor the input voltage node is
shown in Figure 19:
Ra
TH
I
OV
V
Ra
)
(
=
Set
Ra value based on system allowable current
Ra
I
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
1
)
(
)
(
UV
V
OV
V
Ra
Rb
()
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
+
=
1
)
(
)
(
TH
UV
V
UV
V
Rb
Ra
Rc
Where:
)
(
TH
UV
V
: UV threshold voltage at Vin.
)
(
TH
OV
V
: OV threshold voltage at Vin.
)
(UV
V
: UV voltage set
Ra
I
:
Ra current.
Alternatively,
a
two-resistor
voltage
divider
configuration for each threshold can be used and is
shown in (Figure 20).
The UV resistor voltage divider can be obtained from
the following equations:
RUV
TH
UV
I
UV
V
R
)
(
1
=
Set
UV
R1 value based on system allowable current
A
I
RUV
μ
100
≥
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
1
)
(
)
(
1
2
TH
UV
UV
UV
V
UV
V
R
R
Where:
)
(
TH
UV
V
: UV threshold voltage
RUV
I
:
UV
R1
current
RUV
TH
UV
I
UV
V
R
)
(
1
=
Set
OV
R1 value based on system allowable current
A
I
RUV
μ
100
≥
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
1
)
(
)
(
1
2
TH
OV
OV
OV
V
OV
V
R
R
Where:
)
(
TH
OV
V
: OV threshold voltage
ROV
I
:
OV
R1
current
Figure 19: UV & OV three-resistor divider
configuration
Figure 20: UV & OV two-resistor divider
configuration
END OF LIFE



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