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PI2125 Datasheet(PDF) 16 Page - Vicor Corporation

Part # PI2125
Description  30 Volt, 12 Amp Full-Function Active ORing Solution
PDF  20 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

PI2125 Datasheet(HTML) 16 Page - Vicor Corporation

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RUV
TH
UV
I
UV
V
R
)
(
1
=
Set
value based on system allowable current
OV
R1
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
:
current.
OV
R1
Typical Application Example 1:
Requirement:
Redundant Bus Voltage = 12V
Load Current = 10A (assume through each
redundant path)
Maximum Ambient Temperature = 70°C; no air flow
Auxiliary Voltage = 24V±10% (21.6V to 26.4V).
Solution:
A single PI2125 for each redundant 12V power
source should be used. Vin is 12V which is higher
than the SP pin maximum voltage rating of 8V, so
the PI2125 should be configured in the floating
configuration as shown in Figure 23.
PI2125 is
floated on Vin by connecting it’s GND pin and the
low side of the VC coupling capacitor to Vin.
Vaux:
Make sure that the Vaux voltage is always
higher than Vin (dc-dc converter output) by 6.0V to
ensure that the internal MOSFET is fully enhanced.
Since the auxiliary voltage is higher than the PI2125
VC clamp voltage a bias resistor (Rbias) is needed
in series with the VC pin.
Rbias value:
Ω
=
−
=
K
mA
V
V
Rbias
45
.
1
2
.
4
5
.
15
6
.
21
or 1.43KΩ
Rbias Power dissipation rating
mW
K
V
Pd
Rbias
83
43
.
1
)
5
.
15
4
.
26
(
2
=
Ω
−
=
Based on the resultant power dissipation on the bias
resistor, use a ¼W rated resistor.
SP and SN pins:
Since the PI2125 is floating, the
GND pin and S pin are connected to Vin, so connect
the SP pin directly to the PI2125 GND pin to reduce
the effect of parasitics between the SP pin and the
GND pin. This will avoid negative voltages on the SP
pin with respect to the GND pin. Connect SN to the
D pin.
BK pin:
Connect the BK pin to the GND pin to
achieve the minimum reverse current response time
SL pin: Not required, so leave floating
Fault pin
: The FT pin output is referenced to the
PI2125 GND pin which is connected to Vin. A level
shift circuit can be added to make FT output
referenced
to
the
system
ground.
The
recommended level shift circuit is shown in Figure
23. The level shift circuit uses a Dual Bias Resistor
Picor Corporation • picorpower.com
PI2125
Rev 1.0
Page 16 of 20



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