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| 型号： | SI8244BB-C-IS1 |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 10/30页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO DRIVER PWM 16-SOIC |
| 标准包装： | 48 |
| 类型： | 音频驱动器 |
| 应用： | D 类音频放大器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 管件 |
| 其它名称： | 336-2001-5 SI8244BB-B-IS1 |
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Si824x
18
Rev. 1.0
3.4. Power Supply Connections
Isolation requirements mandate individual supplies for VDDI, VDDA, and VDDB. The decoupling caps for these
supplies must be placed as close to the VDD and GND pins of the Si824x as possible. The optimum values for
these capacitors depend on load current and the distance between the chip and the regulator that powers it. Low
effective series resistance (ESR) capacitors, such as Tantalum, are recommended.
3.5. Power Dissipation Considerations
Proper system design must assure that the Si824x operates within safe thermal limits across the entire load range.
The Si824x total power dissipation is the sum of the power dissipated by bias supply current, internal switching
losses, and power delivered to the load. Equation 1 shows total Si824x power dissipation. In a non-overlapping
system, such as a high-side/low-side driver, n = 1.
Equation 1.
The maximum power dissipation allowable for the Si824x is a function of the package thermal resistance, ambient
temperature, and maximum allowable junction temperature, as shown in Equation 2:
Equation 2.
Substituting values for PDmax Tjmax, TA, and ja into Equation 2 results in a maximum allowable total power
dissipation of 1.19 W. Maximum allowable load is found by substituting this limit and the appropriate datasheet
values from Table 1 on page 5 into Equation 1 and simplifying. The result is Equation 3 (0.5 A driver) and
Equation 4 (4.0 A driver), both of which assume VDDI = 5 V and VDDA = VDDB = 18 V.
Equation 3.
Equation 4.
P
D
V
DDIIDDI
2V
DDOIQOUT
C
intVDDO
2
F
+
2n C
LVDDO
2
F
++
where:
P
D is the total Si824x device power dissipation (W)
I
DDI is the input-side maximum bias current (3 mA)
I
QOUT is the driver die maximum bias current (2.5 mA)
C
int is the internal parasitic capacitance (75 pF for the 0.5 A driver and 370 pF for the 4.0 A driver)
V
DDI is the input-side VDD supply voltage (4.5 to 5.5 V)
V
DDO is the driver-side supply voltage (10 to 24 V)
F is the switching frequency (Hz)
n is the overlap constant (max value = 2)
=
P
Dmax
T
jmax
T
A
–
ja
---------------------------
where:
P
Dmax = Maximum Si824x power dissipation (W)
T
jmax = Si824x maximum junction temperature (150 °C)
T
A = Ambient temperature (°C)
ja = Si824x junction-to-air thermal resistance (105 °C/W)
F = Si824x switching frequency (Hz)
C
L(MAX)
1.4
10
3
–
F
--------------------------
7.5
–
10
11
–
=
C
L(MAX)
1.4
10
3
–
F
--------------------------
3.7
–
10
–
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI8244BB-C-IS1R | 制造商:Silicon Laboratories Inc 功能描述:Class D Audio Driver 16-Pin SOIC N T/R 制造商:Silicon Laboratories Inc 功能描述:CLASS D AUDIO DRIVER - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC AUDIO DRIVER PWM 16-SOIC 制造商:Silicon Laboratories Inc 功能描述:2.5kV 4A "D" Audio Drvr 8V UVLO PWM in 制造商:Silicon Laboratories 功能描述:Class D Audio Driver 16-Pin SOIC N T/R |
| SI8244BB-D-IS1 | 功能描述:IC AUDIO DRIVER PWM 16-SOIC 制造商:silicon labs 系列:- 包装:管件 零件状态:有效 功能:线路驱动器 应用:前置放大器 通道数:2 接口:模拟 电压 - 电源:4.5 V ~ 5.5 V 工作温度:-40°C ~ 125°C（TA） 规格:D 类 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商器件封装:16-SOIC 标准包装:48 |
| Si8244CB-B-IS1 | 功能描述:音频放大器 2.5kV 4A Class D Audio Drivr 10V UVLO 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 |
| Si8244CB-C-IS1 | 功能描述:音频放大器 2.5kV 4A Class D Audio Drivr 10V UVLO 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 |
| SI8244CB-C-IS1R | 制造商:Silicon Laboratories Inc 功能描述:CLASS D AUDIO DRIVER - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC AUDIO DRIVER PWM 16-SOIC 制造商:Silicon Laboratories Inc 功能描述:2.5kV 4A "D" Audio 10V UVLO PWM input |
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