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參數(shù)資料
| 型號： | IRS20955SPBF |
| 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(qū)動程序 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 524K |
| 代理商： | IRS20955SPBF |
IRS20955
(
S
)
PbF
PRELIMINARY
www.irf.com
12
HIGH
SIDE
CS
VB
HO
VS
LOW SIDE CS
UV
Q
UV
DETECT
DEAD TIME
VCC
LO
COM
CSH
SD
OCSET
UV
DETECT
HV
LEVEL
SHIFT
HV
LEVEL
SHIFT
FLOATING HIGH SIDE
5V REG
-B
Vcc
+B
OUT
R1
R2
R3
D1
Q1
Q2
R4
R5
Dbs
Cbs
VREF
Figure 12. Bi-directional Over Current Protection
Low-side Over Current Sensing
For negative load currents, low-side over current
sensing monitors the load condition and shuts down
switching operation if the load current exceeds the
preset trip level.
Low-side current sensing is based on the
measurement of V
DS
across the low side MOFET
during low-side turn on. In order to avoid triggering
OCP from overshoot, a blanking interval inserted
after LO turn on disables over current detection for
450 ns.
The OCSET pin is used to program the threshold for
low-side over current sensing. When the V
DS
measured across the low-side MOSFET exceeds
the voltage at the OCSET pin with respect COM, the
IRS20955S begins the OCP sequence described
earlier.
Since the voltage from V
S
to COM is compared to
the voltage at the OCSET
pin, the voltage at OCSET
determines the trip level for over-current detection.
By selecting the trip level for over-current, the
voltage at OCSET can be calculated using the
equation below.
V
OCSET
= V
DS(LOW SIDE)
= I
TRIP+
x R
DS(ON)
In order to minimize the effect of the input bias
current at the OCSET pin, select resistor values for
R4 and R5 such that the current through the voltage
divider is 0.5 mA or more.
* Note: Using V
REF
to generate an input to OCSET
through a resistive divider provides improved
immunity from fluctuations in V
CC
.
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| IRS20955STRPBF | 功能描述:功率驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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| 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 |
| IRS20957STRPBF | 功能描述:功率驅(qū)動器IC Class D Aud Drvr 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| IRS2101PBF | 功能描述:功率驅(qū)動器IC Hi&Lw Sd Drvr 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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