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參數(shù)資料
| 型號： | STK404-140N-E |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC HYBRID MOD AUD PWR AMP AB 1CH |
| 標準包裝： | 25 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 180W x 1 @ 6 歐姆 |
| 電源電壓： | 0 V ~ 78 V |
| 特點： | 靜音，短路保護，待機 |
| 安裝類型： | * |
| 供應商設備封裝： | * |
| 封裝/外殼： | * |
| 包裝： | * |
STK404-140N-E
No.A2100-8/11
A Thermal Design Tip For STK404-140N-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 STK404-140N-E ; 120W×1ch)
If VCC is ±51V, and RL is 6, then the total power dissipation (Pd) of inside Hybrid IC is as follow;
Pd = 57.2W (at 15W output power,1/8 of PO max)
There are four (2) transistors in Audio Section of this Hybrid IC, and thermal resistance (θj-c) of each transistor is
1.1°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)/57.2
1.31
From (2)’
c-a (150 50)/57.2 1.1/2
1.19
Therefore, in order to satisfy both (1)’ and (2)’, the thermal resistance of a desired Heat-sink will be 1.19°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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| STK404-140S | 制造商:Sanyo Fisher 功能描述:SUB ONLY SANYO IC 13-PIN SIP 180WX1CH CLASS AB AF PWR AMP |
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