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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(hù)的數(shù)字音頻驅(qū)動程序 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 524K |
| 代理商： | IRS20955SPBF |
IRS20955
(
S
)
PbF
PRELIMINARY
www.irf.com
11
Shutdown Input
When V
CSD
falls below V
th2
, the IRS20955S begins
to charge Ct in an attempt to resume operation.
Once the voltage of the CSD pin rises above the
upper threshold,
V
th1
, the IC begins to operate
normally again.
SHUTDOWN
VB
VDD
IN
CSD
VSS
COM
OCSET
LO
VCC
HO
VS
DT
CSH
NC
NC
VREF
Figure 9. Shutdown Input
Latched Protection
Connecting CSD to V
DD
through a 10 k
or less
resistor configures the over current protection latch.
The latch locks the IC in shutdown mode after over
current is detected. An external reset switch can be
used to bring CSD below the lower threshold
V
th2
for
a minimum of 200 ns to properly reset the latch.
After the power up sequence, a reset signal to the
CSD pin is required to release the IC from shutdown
mode.
VB
VDD
IN
CSD
VSS
COM
OCSET
LO
VCC
HO
VS
DT
CSH
NC
NC
VREF
<10k
RESET
Figure 10. Latched Protection Configuration
Interfacing with System Controller
The IRS20955S can communicate with an external
system controller through a simple interfacing circuit
such as the one shown in Figure 11. A generic PNP
transistor, shown as U1, can detect the sink current
at the CSD pin during an OCP event and output a
shutdown signal to an external system controller.
Another generic NPN transistor, shown as U2, can
then reset the internal protection logic by pulling the
CSD voltage below V
th2
for a minimum of 200 ns.
Note that the CSD pin is configured to operate in
latched OCP. After the power up sequence, a reset
signal to the CSD pin is required to release the IC
from shutdown mode.
Figure 11. Interfacing with System Controller
Programming OCP Trip Level
In a Class D audio amplifier, the direction of the load
current alternates with the audio input signal. An
over-current condition can therefore occur during
either a positive current cycle or a negative current
cycle. The IRS20955 uses the R
DS(ON)
of the output
MOSFETs as current sensing resistors. Due to the
structural constraints of high voltage ICs, current
sensing is implemented differently for high side and
low side. If the measured current exceeds a
predetermined threshold, the OCP block outputs a
signal to the protection block to shutdown the
MOSFET to protect the switching devices.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| IRS20957SPBF | 功能描述:功率驅(qū)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(fēng)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 |
| 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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