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參數(shù)資料
| 型號： | IRS20954STRPBF |
| 廠商： | International Rectifier |
| 英文描述： | Protected Digital Audio Driver |
| 中文描述： | 受保護的數(shù)字音頻驅動程序 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 585K |
| 代理商： | IRS20954STRPBF |
IRS20954S
www.irf.com
14
Since the sensed voltage of V
S
is compared with the voltages fed to the OCSET
pin, the required voltage of OCSET with
respect to COM for a trip level I
TRIP+
is:
V
OCSET
= V
DS(LOW SIDE)
= I
TRIP+
x R
DS(ON)
In order to neglect the input bias current of OCSET pin, it is recommended to use 10 k
total for R4 and R5 to drain 0.5 mA
through the resistors.
High Side Over-Current Sensing
For the positive load current, high side over-current sensing monitors over load condition by measuring V
DS
with CSH and Vs
pins and shutdown the operation. The CSH pin is to detect the drain-to-source voltage refers to the V
S
pin which is the source
of the high side MOSFET. In order to neglect overshoot ringing at the switching edges, CSH sensing circuitry starts monitoring
after the first 300 ns the HO is on by blanking the signal from CSH pin.
In contrast to the low side current sensing, the threshold of CSH pin to engage OC protection is internally fixed at 1.2 V. An
external resistive divider R2 and R3 can be used to program a higher threshold.
An external reverse blocking diode, D1, is to block high voltage feeding into the CSH pin while high side is off.
By subtracting a
forward voltage drop of 0.6 V at D1, the minimum threshold which can be set in the high side is 0.6 V across the drain to
source.
With the configuration in Fig. 14, the voltage in CSH is:
(
)
(
)
(
3
2
R
R
+
Where:
V
DS(HIGH SIDE)
is drain to source voltage of the high side MOSFET in its ON state
VF
(D1)
is the forward drop voltage of D1
Since V
DS(HIGH SIDE)
is determined by the product of drain current I
D
and R
DS(ON)
in the high side MOSFET. V
CSH
can be written
as:
(
)
(
)
(
3
2
R
R
+
2
=
OCH
Vth
R
The reverse blocking diode D1 is forward biased by a 10 k
resistor R1 when the high side MOSFET is on.
)
3
D
F
HIGHSIDE
DS
CSH
V
V
R
V
+
=
)
3
D
F
D
ON
DS
CSH
V
I
R
R
V
+
=
1
3
+
F
DS
V
V
R
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IRS20955PBF | 制造商:International Rectifier 功能描述:MOSFET DRVR 100V 1.2A 2-OUT HI/LO SIDE HALF BRDG INV/NON-INV - Bulk |
| IRS20955SPBF | 功能描述:功率驅動器IC 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 |
| IRS20955STRPBF | 功能描述:功率驅動器IC 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 |
| IRS20957SPBF | 功能描述:功率驅動器IC Prot DIG Audio DRVR 100V 1.0A 500ns 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 |
| IRS20957SPBF | 制造商:International Rectifier 功能描述:IC MOSFET DRIVER HIGH-SPEED SOIC-16 制造商:International Rectifier 功能描述:IC, MOSFET DRIVER, HIGH-SPEED, SOIC-16 |
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