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參數(shù)資料
| 型號(hào)： | IRS20954S |
| 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(dòng)程序 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 585K |
| 代理商： | IRS20954S |
IRS20954S
www.irf.com
16
Low Side Over-current Setting
Designing with the same MOSFET as in high side with R
DS(ON)
of 100 m
, the OCSET voltage, V
OCSET
, to set 30 A
trip level is given by:
V
OCSET
= I
TRIP+
x R
DS(ON)
= 30 A x 100 m
= 3.0 V
Choose R4+R5=10 k
for proper loading of VREF pin, thus
V
R
REF
0
=
Choose R5 = 5.6 k
and R4 = 3.9 k
from E-12 series.
In general, R
DS(ON)
has a positive temperature coefficient that needs to be considered when the threshold level is being set.
Although this characteristic is preferable from a device protection point of view, these variation needs to be considered as well
as variations of external or internal component values.
Deadtime Generator
The deadtime generator block provides a blanking time between the high-side on and low-side on to avoid a simultaneous on
state causing shoot-through. The IRS20954 has an internal deadtime generation block to reduce the number of external
components in the output stage of a Class D audio amplifier. Selectable deadtime programmed through the DT/SD pin voltage
is an easy and reliable function, which requires only two external resistors. This selectable deadtime way of setting prevents
outside noise from modulating the switching timing, which is critical to the audio performances.
=
=
k
k
V
V
k
V
OCSET
8
10
1
10
5
Where V
REF
is the output voltage of VREF pin, 5.1 V typical.
How to Determine Optimal Deadtime
The effective deadtime in an actual application differs from the deadtime specified in this datasheet due to finite switching fall
time, t
f
. The deadtime value in this datasheet is defined as the time period from the starting point of turn-off on one side of the
switching stage to the starting point of turn-on on the other side as shown in Fig. 15. The fall time of MOSFET gate voltage
must be subtracted from the deadtime value in the datasheet to determine the effective dead time of a Class D audio amplifier.
(Effective deadtime) = (Deadtime in datasheet) – (fall time, tf)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IRS20954SPBF | Protected Digital Audio Driver |
| IRS20954STRPBF | Protected Digital Audio Driver |
| IRS20955PBF | PROTECTED DIGITAL AUDIO DRIVER |
| IRS20955SPBF | PROTECTED DIGITAL AUDIO DRIVER |
| IRS2104PBF | HALF-BRIDGE DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRS20954SPbF | 功能描述:功率驅(qū)動(dòng)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(shí)間: 下降時(shí)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 |
| IRS20954STRPbF | 功能描述:功率驅(qū)動(dòng)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(shí)間: 下降時(shí)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 |
| 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(qū)動(dòng)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(shí)間: 下降時(shí)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 |
| IRS20955STRPBF | 功能描述:功率驅(qū)動(dòng)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(shí)間: 下降時(shí)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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