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PI2127 Datasheet(PDF) 15 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) 15 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2127
Rev 1.3
Page 15 of 19
At maximum response time:
A
nH
ns
V
L
t
V
I
PARASITIC
RVS
S
PEAK
5
.
112
60
150
*
45
*
=
=
=
Avalanche Energy:
2
*
*
*
3
.
1
*
3
.
1
*
2
1
PEAK
PARASITIC
S
DSS
DSS
AS
I
L
V
BV
BV
E
−
=
J
A
nH
V
V
E
AS
μ
897
5
.
112
*
60
*
45
60
*
3
.
1
60
*
3
.
1
*
2
1
2 =
−
=
The avalanche energy is well below the total MOSFET
specified peak current of 150A for 300ns and below
the rated avalanche energy. The specified energy
can be calculated from Single Pulse Avalanche
Current as specified in the Absolute Maximum Ratings
table:
mJ
s
A
V
t
I
BV
AV
AS
DSS
14
11
33
60
3
.
1
2
1
*
3
.
1
2
1
=
⋅
⋅
⋅
=
⋅
⋅
⋅
μ
Figure 23 : Two PI2127 in High Side ORing
configuration
VC bias through Constant current circuit
Select an NPN transistor with VCEO equal or higher
than the input voltage (Vin) plus any expected
transient voltage and capable of handling the
expected maximum power dissipation.
Any NPN
transistor with VCEO ≥ 60V in a small footprint is
suitable. An exemplary NPN is the BC846 from NXP
Semiconductors:
From the BC846 datasheet:
NPN general-purpose transistor
VCEO = 65V Collector-Emitter maximum voltage
IC =
100mA maximum collector current
hFE =
110 minimum at IC=2mA
VBE = 0.580V to 0.70V Base-Emitter voltage
at IC = 2mA and 25°C
RθJ-A = 500°C/W Junction to ambient thermal
resistance.
Select Zener Diode: A Zener diode with low bias
current and VZ=10 in small foot print is suitable for this
application. An exemplary Zener diode is the
MM3Z10VST1 the from ON Semiconductor
From the MM3Z10VST1 datasheet:
10V, 200mW Zener Diode
VZ =
9.80V to 10.2V Zener voltage range
IR =
10μA will hold the Zener breakdown voltage
at 9.8V
Ω
=
−
=
−
=
k
mA
V
V
I
on
V
V
R
MAX
VC
BE
MIN
Z
LIMIT
33
.
4
1
.
2
7
.
0
8
.
9
)
(
_
_
Or 4.32kΩ 1%
A
mA
h
I
I
MIN
FE
MAX
C
MAX
B
μ
27
.
27
110
3
_
_
_
=
=
=
RZ Calculation:
Use 120μA as minimum for the Zener diode reverse
leakage current and Q2 base current combined.
Ω
=
−
=
+
−
=
k
A
V
V
I
I
V
V
R
MAX
B
Z
MAX
Z
MIN
in
Z
248
120
2
.
10
40
_
_
_
μ
Select RZ= 249kΩ 1%
Maximum Q1 collector current:
mA
k
V
V
R
V
V
I
MIN
LIMIT
MIN
BE
MAX
Z
MAX
C
29
.
2
98
.
0
*
32
.
4
50
.
0
2
.
10
_
_
_
_
=
Ω
−
=
−
=
Maximum Q2 power dissipation
)]
(
[
*
_
_
_
1
MAX
EB
MIN
Z
CLM
VC
MAX
MAX
C
Q
V
V
V
Vin
I
Pd
−
−
−
=
−
mW
V
V
V
V
mA
Pd
Q
57
)]
7
.
0
8
.
9
(
11
45
[
*
29
.
2
1
=
−
−
−
=
Transistor temperature rise
C
W
C
mW
R
Pd
T
A
J
Q
RISEQ
°
=
°
=
=
−
50
.
28
500
*
57
*
1
1
θ



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