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參數(shù)資料
| 型號： | IRS20955PBF |
| 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)： | 15/21頁 |
| 文件大?。?/td> | 524K |
| 代理商： | IRS20955PBF |
IRS20955
(
S
)
PbF
PRELIMINARY
www.irf.com
15
HO (or LO)
LO (or HO)
tf
Dead-time
in
datasheet
Effective dead-time
10%
10%
90%
Figure 15. Effective Deadtime
A longer deadtime period is required for a MOSFET
with a larger gate charge value because of the
longer
t
f
.
. Although a shorter effective deadtime
setting is beneficial to achieving better linearity in
Class D amplifiers, the likelihood of shoot-through
current increases with narrower deadtime settings.
Negative values of effective deadtime may cause
excessive heat dissipation in the MOSFETs, leading
to
potentially
To calculate the optimal deadtime in a given
application, the fall time tf for both HO and LO in the
actual circuit need to be taken into account. In
addition, variations in temperature and device
parameters could also affect the effective deadtime
in the actual circuit. Therefore, a minimum effective
deadtime of 10 ns is recommended to avoid shoot-
through current over the range of operating
temperatures and supply voltages.
serious
damage.
Programming Deadtime
The IRS20955S selects the deadtime from a range
of preset deadtime values based on the voltage
applied at the DT pin. An internal comparator
translates the DT input to a predetermined dead-
time by comparing the input with internal reference
voltages. These internal reference voltages are set
in the IC through a resistive voltage divider using
V
CC.
The relationship between the operation mode
and the voltage at DT pin is illustrated in the
Figure16 below.
Dead-time
Vcc
0.57xVcc
0.36xVcc
0.23xVcc
45nS
35nS
25nS
15nS
V
DT
Figure 16. Deadtime vs. V
DT
Table 1 suggests pairs of resistor values used in the
voltage divider for selecting deadtime. Resistors
with up to 5% tolerance are acceptable when using
these values.
Vcc
COM
DT
>0.5mA
R1
R2
IRS20955
Figure 17. External Voltage Divider
Table 1 Recommended Resistor Values for Deadtime Selection
Deadtime Mode
R1
DT1
<10 k
DT2
3.3 k
DT2
5.6 k
DT4
8.2 k
R2
Open
8.2 k
4.7 k
3.3 k
DT/SD Voltage
1.00(V
CC
)
0.71(V
CC
)
0.46(V
CC
)
0.29(V
CC
)
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相關代理商/技術參數(shù) |
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|---|---|
| IRS20955SPBF | 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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