參數(shù)資料
型號(hào)： HV302
廠商： Supertex, Inc.
英文描述： Sequencing Hotswap Controllers
中文描述： 測序熱插拔控制器
文件頁數(shù)： 7/10頁
文件大?。?/td> 618K
代理商： HV302
7 Rev. D 04/17/02
HV302 / HV312
Design Information-
continued
Programming Current Limit and Circuit Breaker
Feedback Capacitor Mode Operation
In this operating mode the circuit breaker trip current and the
inrush current limit can be independently programmed. In fact the
circuit breaker can be completely disabled by setting R
SENSE
= 0
.
The circuit breaker will trip in less than 5
μ
s when the voltage on
the SENSE pin is raised 100mV above the V
EE
pin and the value of
the sense resistor may be calculated from the following equation:
100mV
I
For an 8A circuit breaker:
100mV
R
SENSE
=
=
CB
I
CB
CB
-
SENSE
V
SENSE
R
=
=
12.5m
8A
The power rating of the sense resistor must be greater than or
equal to I
CB
x V
SENSE-CB
.
The following diagrams depict the equivalent circuitry to clarify the
feedback capacitor operation for programming the inrush current
limit.
The inrush current limit may be programmed as follows:
Choose inrush current limit, for example I
CL
= 1A
R
I
SENSE
CL
SINK
If the Circuit Breaker function is disabled by setting R
SENSE
= 0
,
then I
SINK
= 0A. However, in this example we assume that the
Circuit Breaker function is enabled and therefore use I
SINK
= 2.5
μ
A.
Calculate
A
5
k
5
m
5
12
A
1
k
5
μ
=
×
=
×
=
I
Calculate C2 (feedback capacitor) discharge current
I
A
10
I
SINK
2
C
μ
=
If Auto-Retry is disabled an adjustment must be made to I
C2
V
I
DISABLE
Where Vt is the maximum threshold voltage of the MOSFET.
Therefore, the adjusted value of I
C2
is:
AUTO
SINK
2
C
I
I
A
10
I
μ
=
A
5
A
10
I
2
C
μ
μ
=
In this example we assume that Auto-Retry is enabled and
therefore use I
C2
= 7.5
μ
A.
dv
2
C
2
C
×
=
I
and
A
5
A
5
A
10
μ
=
μ
μ
=
A
6
=
M
5
V
4
R
t
AUTO
μ
=
=
A
9
A
6
μ
=
μ
Note that
dt
dt
dv
C
LOAD
CL
I
×
=
Since V
IN
is fixed and V
RAMP
is constant during limiting, then
dv across C
LOAD
=
dt
and their other terminals are at fixed voltages during inrush current
I
2
C
As previously calculated and by conservation of charge on RAMP
node I
C2
=7.5
μ
A based on the chosen inrush current limit of I
CL
=1A.
Given that C
LOAD
=100
μ
F the required value for C2 can be
calculated.
5
I
CL
Note that during initial power application the RAMP pin is voltage
protected by the capacitive AC voltage divider consisting of C
LOAD
,
C2 and C
RAMP
and the GATE pin is internally clamped.
Servo Control Mode Operation
The circuit breaker will trip in less than 5
μ
s when the voltage on
the SENSE pin is raised 100mV above the V
EE
pin and the value of
the sense resistor may be calculated from the following equation:
100mV
I
For a 2A circuit breaker:
100mV
R
SENSE
=
=
dt
dv across C2 as they share a common node
limiting. Therefore,
LOAD
CL
2
C
C
I
=
or
CL
I
LOAD
2
C
C
I
2
×
=
C
.
Therefore
nF
75
.
A
1
F
100
A
C
I
2
LOAD
2
C
=
μ
×
μ
=
×
=
C
CB
I
CB
CB
-
SENSE
V
SENSE
R
=
=
50m
2A
The power rating of the sense resistor must be greater than or
equal to I
CB
x V
SENSE-CB
.
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 Fax: (408) 222-4895 www.supertex.com
相關(guān)PDF資料
PDF描述
HV302DB1 Hotswap Controller
HV302NG Sequencing Hotswap Controllers
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HV312DB1 Hotswap Controller
HV312NG Sequencing Hotswap Controllers
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HV302DB1 功能描述:電源管理IC開發(fā)工具 HV302 Demo Brd RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
HV302NG 功能描述:熱插拔功率分布 Cntl (Act Low) RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
HV302NG-G 功能描述:熱插拔功率分布 Cntl (Act Low) RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
HV302NG-M905 功能描述:熱插拔功率分布 -10 to -90V Activ Hi RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
HV302NG-M905-G 功能描述:熱插拔功率分布 -10 to -90V Activ Hi RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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