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PI2123 数据表(PDF) 16 Page - Vicor Corporation

部件名 PI2123
功能描述  15 Volt, 15 Amp Full-Function Active ORing Solution
PDF  20 Pages
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制造商  VICOR [Vicor Corporation]
网页  http://www.vicorpower.com
标志 VICOR - Vicor Corporation

PI2123 数据表(HTML) 16 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2123
Rev 1.0
Page 16 of 20
Typical Application Example 1:
Requirement:
Redundant Bus Voltage = 5.0V
Load Current = 12A (assume through each
redundant path)
Maximum Ambient Temperature = 75°C: no air flow.
Auxiliary Voltage = 12V (10V to 14V)
Solution:
A single PI2123 for each redundant 5.0V power
source should be used, configured as shown in the
circuit schematic in Figure 22.
Vaux:
Since the Vaux voltage does not exceed the
VC pin clamp voltage, connect the Vaux directly to
the VC pin
SP and SN pins:
Connect each SP pin to the S pins
and each SN pin to the D pins
BK pin:
Connect the BK pin to the ground to
achieve the minimum reverse current response time.
SL pin: Not required, so leave floating
FT pin: Connect to the logic input and to the logic
power supply via a 10KΩ resistor.
Program UV and OV to monitor input voltage:
Program UV at 4.5V and OV at 5.5V
Use the three-resistor divider configuration:
A
I
Ra
μ
200
=
Ω
=
=
k
A
mV
Ra
5
.
2
200
500
μ
or 2.49kΩ 1%
Ω
=
⎟
⎠
⎞
⎜
⎝
⎛
−
Ω
=
553
1
5
.
4
5
.
5
49
.
2
V
V
k
Rb
or 549Ω 1%
()
Ω
=
⎟
⎠
⎞
⎜
⎝
⎛
−
Ω
+
Ω
=
k
mV
V
k
Rc
3
.
24
1
500
5
.
4
549
49
.
2
1%
Power Dissipation and Junction Temperature:
First use Figure 13 (Junction Temperature vs. Input
Current) to find the final junction temperature at 12A
load current and 75°C ambient temperature. In
Figure 13 (illustrated in Figure 21) draw a vertical
line from 12A to half way between the TA=70°C and
TA=80°C lines. Then draw a horizontal line towards
the Y-axis (Junction Temperature). The Junction
Temperature at full load current (12A) and 75°C
ambient is 117°C.
Rds(on) is 4.0mΩ maximum at 25°C and will
increase as the Junction temperature increases.
From Figure 11, at 117°C Rds(on) will increase by
~35%, then
Figure 21:
Example 1 final junction temperature at
12A/75°C TA
Ω
=
•
Ω
=
m
m
on
Rds
4
.
5
35
.
1
0
.
4
)
(
maximum at 117°C
JA
Rth : 54°C/W
)
(
2
on
Rds
Is
Rth
T
T
JA
A
J
∗
∗
+
=
Recalculate TJ:
C
m
A
W
C
C
T
J
°
=
⎟
⎠
⎞
⎜
⎝
⎛
Ω
∗
∗
°
+
°
=
99
.
116
4
.
5
)
12
(
54
75
2
Maximum power dissipation at 117°C Junction
Temperature:
mW
m
A
on
Rds
Iin
Pd
777
4
.
5
)
12
(
)
(
2
2
max
=
Ω
∗
=
∗
=
Reverse current threshold is:
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 room temperature (25°C) typical Rds(on):
A
m
mV
on
Rds
reverse
Vth
reverse
Is
0
.
2
0
.
3
6
)
(
.
.
−
=
Ω
−
=
=
At maximum junction temperature (117°C) and
maximum Rds(on):
A
m
mV
on
Rds
reverse
Vth
reverse
Is
11
.
1
4
.
5
6
)
(
.
.
−
=
Ω
−
=
=



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