参数资料
| 型号： | STK433-040N-E |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC HYBRID MOD AUD PWR AMP AB 2CH |
| 标准包装： | 25 |
| 类型： | AB 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： | 40W x 2 @ 6 欧姆 |
| 电源电压： | 0 V ~ 38 V |
| 特点： | 静音，待机 |
| 安装类型： | * |
| 供应商设备封装： | * |
| 封装/外壳： | * |
| 包装： | * |
STK433-040N-E
No.A2101-9/11
A Thermal Design Tip For STK433-040N-E Amplifier
[Thermal Design Conditions]
The thermal resistance (θc-a) of the heat-sink which manages the heat dissipation inside the Hybrid IC will be
determined as follow:
(Condition 1) The case temperature (Tc) of the Hybrid IC should not exceed 125°C
Pd
c-a + Ta 125°C (1)
Where Ta : the ambient temperature for the system
(Condition 2) The junction temperature of each power transistor should not exceed 150°C
Pd
c-a + Pd/N j-c + Ta 150°C (2)
Where N : the number of transistors (two for 1 channel , ten for channel)
θj-c : the thermal resistance of each transistor (see specification)
Note that the power consumption of each power transistor is assumed to be equal to the total power dissipation (Pd)
divided by the number of transistors (N).
From the formula (1) and (2), we will obtain:
c-a (125 Ta)/Pd (1)’
c-a (150 Ta)/Pd j-c/N (2)’
The value which satisfies above formula (1)’ and (2)’ will be the thermal resistance for a desired heat-sink.
Note that all of the component except power transistors employed in the Hybrid IC comply with above conditions.
[Example of Thermal Design]
Generally, the power consumption of actual music signals are being estimated by the continuous signal of
1/8 PO max. (Note that the value of 1/8 PO max may be varied from the country to country.)
(Sample of STK433-040N-E ; 25W×2ch)
If VCC is ±24V, and RL is 6, then the total power dissipation (Pd) of inside Hybrid IC is as follow;
Pd = 26W (at 3.13W output power,1/8 of PO max)
There are four (4) transistors in Audio Section of this Hybrid IC, and thermal resistance (θj-c) of each transistor is
4.2°C/W. If the ambient temperature (Ta) is guaranteed for 50°C, then the thermal resistance (θc-a) of a desired heat-
sink should be;
From (1)’
c-a (125 50)/26
2.88
From (2)’
c-a (150 50)/26 4.2/4
2.79
Therefore, in order to satisfy both (1)’ and (2)’, the thermal resistance of a desired Heat-sink will be 2.79°C/W.
[Note]
Above are reference only. The samples are operated with a constant power supply. Please verify the conditions when
your system is actually implemented.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| STK433-060-E | 制造商:SANYO Semiconductor Co Ltd 功能描述:Thick Film Hybrid IC 2 Channel Class AB Audio Power IC, 50W x2 |
| STK433-060N-E | 功能描述:音频放大器 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 |
| STK433-070-E | 制造商:SANYO Semiconductor Co Ltd 功能描述:Thick Film Hybrid IC 2 Channel Class AB Audio Power IC, 60W x2 |
| STK433-070G-E | 制造商:ON Semiconductor 功能描述:AF POWER AMPLIFIE - Tape and Reel |
| STK433-070GN-E | 功能描述:音频放大器 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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