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HV301_05 Datasheet(数据表) 6 Page - Supertex, Inc

部件型号  HV301
说明  Hot Swap Controller (Negative Supply Rail)
下载  20 Pages
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制造商  SUTEX [Supertex, Inc]
网页  http://www.supertex.com
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HV301 Datasheet(HTML) 6 Page - Supertex, Inc

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6
A092605
HV301/HV311
From the calculated resistor values the OV and UV start up
threshold voltages can be calculated as follows:
UV
V
V
RR
RR
R
OV
V
V
R
RR
R
ON
UVH
EEUV on
ON
OVL
EEOV on
==
=
×
+
++
==
=
×
++
126
23
12
3
116
3
12
3
.
.
()
()
Where |
V
EEUV(on)| and |VEEOV(on)| are Under & Over Voltage Start
Up Threshold points relative to V
EE.
Then
V
RR
R
RR
V
V
RR
R
R
V
EEUV on
EEUV on
EEOV on
EEOV on
()
()
()
()
.
.
..
..
.
.
.
..
.
++
+
++
+
=
++
++
126
12
3
23
126
487
6 81
9 76
681
9 76
38 29
116
12
3
3
116
487
6 81
9 76
976
kk
k
kk
V
And
kk
k
k
ΩΩ
ΩΩ
ΩΩ
== 59 85
.V
Therefore, the circuit will start when the input supply voltage is
in the range of 38.29V to 59.85V.
Design Information, cont’d.
Undervoltage/Overvoltage Operation
GND
VIN
Pass
Transistor
OFF
ON
UVOFF
UVON
OVOFF
OVON
VSENSE
+ K –
+
+
5k
2.5A
7.5A
10A
10V
10n
0A
0A
RAMP
GATE
7.5A
Vgs
Cgs
Cgd
C2
+
inrush
Rsense=12.5mW
Cdb
(DRAIN)
Cload=100F
Vin
dv
df
on Cramp constant
during limiting so no
current flowing into cap
gm(Vgs-Vt)
VSENSE
VSENSE
5k
10V
10n=Cramp
RAMP
terminal
GATE
Termial
1 : 2
Isink
10A
Internal Circuitry
mirror
C2
0.75nF
Rsense
Vsense
Cload
48V
10A
1.
Choose circuit breaker trip point eg. 8A as follows
Rsense =
Choose inrush level, for example Inrush= 1A
3.Calculate Isink
Inrush *Rsense
2.5 A
4.
Calculate C discharge limit
= 10 A -Isink = 7.5 A (typical) = iC
4a. Adjust for Auto - retry disable, if used
Vt
R
e.g.
4V
2.5M
= 1.6 A
e.g. iC = 10 A -Isink -1.6 A
2
2
max
disable
2
100
100
8
12 5
2
5
112 5
5
mV
I
mV
m
k
Am
k
CB
==
==
×
µµ
µ
⇒µ
µ
.
.
.
In this example we assume Auto
In this example we assume Auto - retry is enabled so
ignore 1.6 A,
iC = 10 A -Isink = 7.5 A
5.
Note: i = C
iC = C
Inrush= C
Note V is fixed and V
is constant during limiting
across C=
across C(as they share a
common node and their other terminals are fixed during inrush)
Inrush=
by conservation of charge on RAMP Node iC = 7.5 A
Inrush=
.
2
22
load
IN
RAMP
load
2
2
µ∴
µ
µ
××
=⇒
×
µ
µ×
dv
dt
dv
dt
dv
dt
dv
dt
dv
dt
iC
C
Inrush
C
iC
C
C
AC
load
load
load
2
2
2
2
75
C
C
AC
Inrush
AnF
A
load
2
75
7 5
100
1
µ×
=
µ×
C=
.
= 750pF = 0.75nF
Note that RAMP is protected by AC divider and Gate
is clamped internally.
2
.
Programming Inrush and I
CB
Method 1: Inrush independent of I
CB




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