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参数资料
| 型号： | IRS20124STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/27页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER DGTL AUDIO 14-SOIC |
| 标准包装： | 2,500 |
| 类型： | MOSFET 驱动器 |
| 应用： | 放大器，接收器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC（窄型） |
| 包装： | 带卷 (TR) |
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21
IRS20124S(PbF)
DT/SD pin
DT/SD pin provides two functions: 1) setting dead-
time and 2) shutdown. The IRS20124 determines
its operation mode based on the voltage applied
to the DT/SD pin. An internal comparator
translates which mode is being used by comparing
internal reference voltages. Threshold voltages for
each mode are set internally by a resistive voltage
divider off Vcc, negating the need of using a precise
absolute voltage to set the mode.
Vcc
0.89xVcc
0.57xVcc
0.36xVcc
0.23xVcc
Shutdown
45nS
35nS
25nS
15nS
Operational Mode
VDT
Dead-time
Deadtime Settings vs VDT Voltage
Design Example
Table 1 shows suggested values of resistance for
setting the deadtime. Resistors with up to 5%
tolerance can be
used if these
listed values are
followed.
Vcc
COM
DT/SD
>0.5mA
R1
R2
IRS20124
Table 1. Suggested
Resistor Values for Deadtime
Settings
Shutdown
Since IRS20124 has internal deadtime generation,
independent inputs for HO and LO are no longer
provided. Shutdown mode is the only way to turn
off both MOSFETs simultaneously to protect them
from over current conditions. If the DT/SD pin de-
tects an input voltage below the threshold, V
DT4,
the IRS20124 will output 0 V at both HO and LO
outputs, forcing the switching output node to go
into a high impedance state.
Over Current Sensing
In order to protect the power MOSFET, IRS20124
has a feature to detect over-current conditions,
which can occur when speaker wires are shorted
together. The over-current shutdown feature can
be configured by combining the current sensing
function with the shutdown mode via the DT/SD pin.
Load Current Direction in Class D
Audio
Application
In a Class D audio amplifier, the direction of the
load current alternates according to the audio in-
put signal. An over current condition can therefore
happen during either a positive current cycle or a
negative current cycle. It should be noted that
External Resistor
Deadtime
mode
R1
()
R2
()
DT/SD
(V)
DT1
<10k
Open
1.00 (Vcc)
DT2
3.3k
8.2k
0.71 (Vcc)
DT3
5.6k
4.7k
0.46 (Vcc)
DT4
8.2k
3.3k
0.29 (Vcc)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRS2052M | 制造商:IRF 制造商全称: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:功率驱动器IC Gen5 HVIC 200V 48L 2Ch Dig Aud Drvr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| IRS2053MPBF | 功能描述:音频放大器 200V 0A OTHER RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| IRS2053MTRPBF | 功能描述:音频放大器 200V 0A OTHER RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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