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參數(shù)資料
| 型號： | Si9750 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | In-Rush Current Limit MOSFET Driver(輸入電壓工作范圍2.9-13V，限流MOSFET驅(qū)動器) |
| 中文描述： | 在浪涌電流限制MOSFET驅(qū)動器（輸入電壓工作范圍2.9 - 13V的，限流MOSFET的驅(qū)動器） |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 226K |
| 代理商： | SI9750 |
Si9750
Vishay Siliconix
FaxBack 408-970-5600, request 70028
www.siliconix.com
S-60752—Rev. C, 05-Apr-99
5
FUNCTIONAL DESCRIPTION
The Si9750 together with an n-channel MOSFET provides the
following functions:
limits di/dt current for hot insertion applications
provides complete short circuit protection
high-side drive allows n-channel MOSFET to be used, for
lower power dissipation
industry-standard microprocessor reset function
logic control input and outputs
Setting the Current Limit
(SENSE, HI/LO pins, R
LIMSET
, R
SENSE
)
The current limit point is determined by the voltage across
R
SENSE
, the value of R
LIMSET
, and the bias current. The
current limit circuit is shown in Figure 1.
The steady state current is set by the equation:
Due to the highly capacitive nature of some loads, the Si9750
has an option to increase the current limit point to a much
higher level at turn-on. In this case, turn-on is defined as
V
GATE
< V
DD
+ 7.8 V. This function is implemented with the HI/
LO pin. If the HI/LO pin is tied low the current limit is 20%
higher during turn-on than the steady state current limit point.
If a higher current limit is needed at start-up, the HI/LO pin
can be tied high. The equation becomes:
Notice that any current limit can be set at turn-on using an
optional resistor, R
HI
.
Relaxation Mode Current Limit
(C
RETRY
pin)
In an overload condition, the Si9750 will go into a relaxation
mode current limit operation that not only protects the source
and load, but also reduces the power dissipated in the
MOSFET. When an overload is detected, the circuit quickly
turns off, then goes into a retry mode whereby the current is
ramped up slowly. If the fault still exists, the current will ramp
down again. This sequence will repeat indefinitely at a period
defined by 10
6
x C
RETRY
until the fault is removed. Typically,
capacitors in the range of 1 nF to 1
μ
F can be used on
C
RETRY
, but the period should be >50 ms.
FIGURE 1.
I
LOAD
R
SENSE
×
I
BIAS
R
LIMSET
×
>
(1)
I
LOAD
with pin HI/LO=Low
(
R
SENSE
×
1.2
I
×
BIAS
R
LIMSET
×
)
>
(2)
I
LOAD
(
R
SENSE
×
1.2
I
×
BIAS
R
LIMSET
I
BIAS
1k
(
R
HI
+
)
+
×
>
(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9750_05 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:In-Rush Current Limit MOSFET Driver |
| SI9750CY | 功能描述:功率驅(qū)動器IC MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| SI9750CY-E3 | 功能描述:功率驅(qū)動器IC InRush Current Limit MOSFET RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| SI9750CY-T1 | 功能描述:功率驅(qū)動器IC InRush Current Limit MOSFET RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| SI9750CY-T1-E3 | 功能描述:功率驅(qū)動器IC InRush Current Limit MOSFET RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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