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参数资料
| 型号： | IRAUDAMP4 |
| 厂商： | International Rectifier |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | KIT 2CH 120W HALF BRDG AUDIO AMP |
| 标准包装： | 1 |
| 放大器类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 170W x 2 @ 4 欧姆 |
| 电源电压： | ±25 V ~ 35 V |
| 工作温度： | -40°C ~ 125°C |
| 板类型： | 完全填充 |
| 已用 IC / 零件： | IRF6645，IRS20955 |
| 已供物品： | 板 |
| 相关产品： | IRF6645TRPBFDKR-ND - MOSFET N-CH 100V 5.7A DIRECTFET IRF6645TR1PBFDKR-ND - MOSFET N-CH 100V 5.7A DIRECTFET IRF6645TRPBFCT-ND - MOSFET N-CH 100V 5.7A DIRECTFET IRF6645TR1PBFCT-ND - MOSFET N-CH 100V 5.7A DIRECTFET IRF6645TRPBFTR-ND - MOSFET N-CH 100V 5.7A DIRECTFET IRF6645TR1PBFTR-ND - MOSFET N-CH 100V 5.7A DIRECTFET |
IRS20955(S)PbF
Programming Deadtime
HO (or LO)
90%
10%
Effective dead - time
The IRS20955S selects the deadtime from a range
of preset deadtime values based on the voltage
applied at the DT pin. An internal comparator
tf
translates the DT input to a predetermined dead-
time by comparing the input with internal reference
LO (or HO)
Dead-time
in
datasheet
10%
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
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
Figure16 below.
Dead- time
15nS
25nS
35nS
45nS
to potentially serious damage.
0.23 xVcc
0.36 xVcc
0.57 xVcc
Vcc
V DT
To calculate the optimal deadtime in a given
application, the fall time t f 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
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.
IRS20955
temperatures and supply voltages.
>0.5mA
Vcc
R1
DT
R2
COM
Figure 17. External Voltage Divider
Table 1 Recommended Resistor Values for Deadtime Selection
Deadtime Mode R1 R2 DT/SD Voltage
DT1
<10 k Ω
Open V CC
DT2
DT3
5.6 k Ω
8.2 k Ω
4.7 k Ω
3.3 k Ω
0.46(V CC )
0.29(V CC )
www.irf.com
DT4 Open
<10 k Ω
COM
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRAUDAMP4A | 功能描述:放大器 IC 开发工具 120W x 2 Ch Class D IRS20957 IRF6645 BRD RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| IRAUDAMP5 | 功能描述:放大器 IC 开发工具 120W x 2 Ch Class D IRS2092S IRF6645 BRD RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| IRAUDAMP6 | 制造商:International Rectifier 功能描述:AUDIO REFERENCE DESIGN KIT FEATURING IRS20957 - Boxed Product (Development Kits) 制造商:International Rectifier 功能描述:BOARD EVAL FOR IRS20957S |
| IRAUDAMP7D | 功能描述:放大器 IC 开发工具 25W - 500W Scalable IRS2092 2-Ch BRD RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| IRAUDAMP7S | 功能描述:放大器 IC 开发工具 25W - 500W Scalable IRS2092 Half BRG BRD RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
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