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PI2007 датащи(PDF) 15 Page - Vicor Corporation

номер детали PI2007
подробное описание детали  Universal High Side Active ORing Controller IC
PDF  19 Pages
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производитель  VICOR [Vicor Corporation]
домашняя страница  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

PI2007 датащи(HTML) 15 Page - Vicor Corporation

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Picor Corporation • picorpower.com
PI2007
Rev 1.3
Page 15 of 19
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 ≥ 100V in a small footprint is
suitable.
An
exemplary
NPN
is
FJV1845
from
Fairchild:
From the FJV1845 datasheet:
NPN Silicon Transistor
VCEO= 120V Collector-Emitter maximum voltage
IC = 50mA maximum collector current
hFE = 150 minimum at IC=3mA
VBE(sat)= 0.55V to 0.65V Base-Emitter saturation
voltage at 25°C
Select Zener Diode: Select the Zener diode with low
bias current, a Zener diode with VZ=10 in small foot
print is suitable for this application. An exemplary
Zener diode MM3Z10VST1 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
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
33
.
23
150
5
.
3
_
_
_
RZ Calculation:
Use 100μA as minimum for the Zener diode reverse
leakage current and Q2 base current combined.
k
A
V
V
I
I
V
V
R
MAX
B
Z
MAX
Z
MIN
in
Z
258
100
2
.
10
36
_
_
_
Select RZ= 249kΩ 1%
Maximum Q2 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
_
_
_
_
Maximum Q2 power dissipation
)]
(
[
_
_
_
2
MAX
EB
MIN
Z
CLM
VC
MAX
MAX
C
Q
V
V
V
Vin
I
Pd
mW
V
V
V
V
mA
Pd
Q
37
.
91
)]
7
.
0
8
.
9
(
11
60
[
29
.
2
2
The transistor Power De-rating vs. temperature curve
in the manufacturer datasheet shows that the device
can operate up to 110°C.
Figure 18: PI2007 in high side +48V application, VC
is biased through constant current circuit.
Fault Indication:
PI2007 SGND pin in this application is floating and
FT is referenced to SGND. The FT output can be
referenced to system return (RTN) by adding a level
shift circuit as shown in Figure 19.
Q1: 2SA1579T106R, 120V PNP transistor from
Rohm.
Q2: DTC114EET1G, 50V NPN with bias resistors from
ON semiconductor.
D1: 30V general purpose diode.
Figure 19:
FT level shift circuitry



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