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參數(shù)資料
| 型號： | IRS20124S |
| 廠商： | International Rectifier |
| 英文描述： | DIGITAL AUDIO DRIVER WITH DISCRETE DEAD-TIME AND PROTECTION |
| 中文描述： | 數(shù)字音頻驅(qū)動與離散死區(qū)時間和保護 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 218K |
| 代理商： | IRS20124S |
IRS20124S(PbF)
22
www.irf.com
tionship between output current direction and
the current in the low side MOSFET. It should be
noted that each MOSFET carries a part of the
load current in an audio cycle. Bi-directional cur-
rent sensing offers over current detection capa-
bilities in both cases by monitoring only the low
side MOSFET.
Load Current
0
Bi-directional Current Sensing
IRS20124 has an over current detection function
utilizing R
of the low side switch as a current
sensing shunt resistor. Due to the proprietary HVIC
process, the IRS20124 is able to sense negative
as well as positive current flow, enabling bi-direc-
tional load current sensing without the need for
any additional external passive components.
Figure 9. Direction in MMOSFET Current and Load
Current
v
s
Vsoc+
Vsoc-
COM
~
~
~
~
~
~
~
~
~
~
~
(a) Normal Operation
Condition
(b) Over- Current in
Positive Load Current
(c) Over- Current in
Negative Load Current
Figure 10. Vs Waveform in Over-current Condition
IRS20124 measures the current during the period
when the low side MOSFET is turned on. Fig.10
illustrates how an excessive voltage at Vs node
detects an over current condition. Under normal
operating conditions, Vs voltage for the low side
switch is well within the trip threshold boundaries,
V
and V
In the case of Fig.9(b) which dem-
onstrates the amplifier sourcing too much current
to the load, the Vs node is found below the trip
level, V
. In Fig.9(c) with opposite current direc-
tion, the amplifier sinks too much current from the
load, positioning Vs well above trip level, V
SOC+.
Once the voltage in Vs exceeds the preset thresh-
old, the OC pin pulls down to COM to detect an
over current condition.
Since the switching waveform usually contains
over/under shoot and associated oscillatory arti-
facts on their transient edges, a 200ns blanking
interval is inserted in the Vs voltage sensing block
at the instant the low side switch is engaged.
Because of this blanking interval, the OC function
will be unable to detect over current conditions if
the low side ON duration less than 200ns.
OC
SET1
OC
SET2
Vs
LO
OC
+
-
+
-
OR
AND
Figure 11. Simplified Functional Block Diagram of
Bi-Directional Current Sensing
As shown in Fig.11, bi-directional current sens-
ing block has an internal 2.0V level shifter feeding
the signal to the comparator. OC
sets the posi-
tive side threshold, and is given a trip level at V
,
which is OC
SET1
- 2.0V. In same way, for a given
OC
SET2
, V
SOC-
SET2
– 2.0V
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| IRS20124SPBF | 功能描述:功率驅(qū)動器IC DIGITAL AUDIO DRVR 200V 1A 60ns 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 |
| IRS20124STRPBF | 功能描述:功率驅(qū)動器IC Dig Aud Drvr w/Deadtime & Prot 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 |
| IRS2052M | 制造商:IRF 制造商全稱:International Rectifier 功能描述:2 CH Digital Audio Amplifier |
| IRS2052MPBF | 制造商:International Rectifier 功能描述:IRS2053 Series 3 Channel 6.2 W 60 dB Half Bridge Digital Audio Amplifier-MLPQ-48 |
| IRS2052MTRPBF | 功能描述:功率驅(qū)動器IC Gen5 HVIC 200V 48L 2Ch Dig Aud 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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