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PI2127 Datasheet(PDF) 14 Page - Vicor Corporation

Part # PI2127
Description  60 Volt, 12 Amp Full-Function Active ORing Solution
PDF  19 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

PI2127 Datasheet(HTML) 14 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2127
Rev 1.3
Page 14 of 19
Typical Application Example:
Requirement:
Redundant Bus Voltage = 40V ±5V
Maximum Load Current = 9A (assume through each
redundant path)
Maximum Ambient Temperature = 60°C, no air flow
(0LFM)
The current flow parasitic inductance for each ORing
device is 60nH.
Solution:
A single PI2127 for each redundant 40V power source
should be used, configured as shown in the circuit
schematic in Figure 23.
RPG selection:
35V <VS-PG <45V
Ω
=
−
=
+
−
=
−
k
mA
V
V
mA
IC
V
V
R
PGMax
S
S
PG
71
.
10
1
.
2
5
.
12
35
1
.
0
max
min
The closest 1% resistor available is 10.5kΩ
()
mW
k
V
V
R
V
V
PdR
PG
PGMin
S
S
PG
110
5
.
10
11
45
)
(
2
2
max
=
Ω
−
=
−
=
−
−
The selected resistor should be capable of supporting
the total power at maximum operating temperature,
60°C.
An 0805 (2012) will support the power
requirement.
FT pin:
Connect
FT pin to the logic input and to the logic
power supply via a resistor, as required for the proper
input level of the supervisor functions.
Power Dissipation and Junction Temperature:
First use Figure 13 (Junction Temperature vs. Input
Current) to find the final junction temperature for 9A
load current at 60°C ambient temperature. In Figure
13 (illustrated in Figure 22) draw a vertical line from
9A to intersect the 60°C ambient temperature line. At
the intersection draw a horizontal line towards the Y-
axis
(Junction
Temperature).
The
Junction
Temperature at maximum load current (9A) and 60°C
ambient is 115°C.
RDS(on) is 11mΩ maximum at 25°C and will increase as
the Junction temperature increases. From Figure 11,
at 115°C RDS(on) will increase by 38%, then
Ω
=
∗
Ω
=
m
m
R
on
DS
18
.
15
38
.
1
11
)
(
maximum at 115°C
Maximum power dissipation is:
W
m
A
R
Iin
Pd
on
DS
23
.
1
18
.
15
)
9
(
2
)
(
2
max
=
Ω
∗
=
∗
=
Recalculate TJ:
C
m
A
W
C
C
T
J
°
=
⎟
⎠
⎞
⎜
⎝
⎛
Ω
∗
∗
°
+
°
=
3
.
115
18
.
15
)
9
(
45
60
2
max
Figure 22: Example 1 final MOSFET junction
temperature at 9A/60°C TA
Reverse Current Threshold:
The following procedure demonstrates how to
calculate the minimum required reverse current in the
internal MOSFET to generate a reverse fault condition
and turn off the internal MOSFET.
At maximum junction temperature (115°C) and
maximum RDS(on):
mA
m
mV
R
V
reverse
Is
on
DS
TH
RVS
395
18
.
15
6
.
)
(
−
=
Ω
−
=
=
−
Peak current under input short is:
At typical response time:
A
nH
ns
V
L
t
V
I
PARASITIC
RVS
S
PEAK
60
60
80
*
45
*
=
=
=



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