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參數(shù)資料
| 型號(hào)： | HV302NG |
| 廠商： | SUPERTEX INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Sequencing Hotswap Controllers |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 618K |
| 代理商： | HV302NG |
8 Rev. D 04/17/02
HV302 / HV312
Design Information-
continued
The inrush current limit can be calculated as follows:
V
I
=
=
SENSE
SENSE
CL
-
SENSE
R
CL
R
50mV
Thus the inrush current limit for a 2A circuit breaker:
50mV
I
CL
=
=
1A
50m
Compensation components from gate to source of the external
MOSFET may be required to reduce peaking of the inrush current.
Compensation can be accomplished as follows:
1.
Start with a 2nF capacitor from gate to source.
2.
Increase capacitor value up to 10nF if needed.
3.
If needed, add a 1k
resistor in series with the above
capacitor.
Servo Mode Timing
The timing functions are defined by the following equations:
C
4
t
=
RAMP
I
RAMP
START
RAMP
I
RAMP
)
th
(
GS
TH
C
V
t
=
TH
START
POR
t
t
t
+
=
≈
FB
SENSE
R
LIMIT
RAMP
I
fs
RAMP
RISE
R
I
g
C
t
LIMIT
I
LOAD
IN
LIMIT
C
V
t
≈
(
)
RAMP
I
RAMP
)
LIMIT
(
GS
INT
A
PWRGD
C
2
V
V
t
=
These equations assume that the load is purely capacitive and the
following definitions apply.
C
RAMP
is the external capacitor connected to the RAMP pin.
I
RAMP
is the output current from the RAMP pin, nominally
10
μ
A, when the voltage drop on R
SENSE
resistor is zero.
V
INT
is the internally regulated supply voltage and can range
from 9V to 11V.
V
GS(th)
is the gate threshold voltage of the external pass
transistor and may be obtained from its datasheet.
V
GS(limit)
is the external pass transistor gate-source voltage
required to obtain the limit current. It is dependent on the
pass transistor’s characteristics and may be obtained from
the transfer characteristics on the transistor datasheet.
g
fs
is the transconductance of the external pass transistor and
may be obtained from its datasheet.
R
FB
is the internal feedback resistor and is nominally 5K
.
I
is the load current when the voltage drop on R
SENSE
resistor is 50mV.
These equations may be used to calculate the minimum value of
C
RAMP
for the most critical system performance characteristics.
For maximum contact bounce duration protection choose a value
for t
POR
and use the following equation:
I
t
C
+
If control of PWRGD active delay is the critical system parameter,
then choose a value for t
PWRGD-A
and use the following equation:
I
t
C
)
it
(lim
GS
INT
)
it
(lim
GS
RAMP
POR
RAMP
V
4
×
=
2
V
V
RAMP
A
PWRGD
RAMP
×
=
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 Fax: (408) 222-4895 www.supertex.com
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