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PT2303-TX 参数 Datasheet PDF下载

PT2303-TX图片预览
型号: PT2303-TX
PDF下载: 下载PDF文件 查看货源
内容描述: 2W × 2 AB类音频功率放大器 [2W × 2 Class AB Audio Power Amplifier]
分类和应用: 放大器功率放大器
文件页数/大小: 17 页 / 421 K
品牌: PTC [ PRINCETON TECHNOLOGY CORP ]
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Tel: 886-2-66296288  
Fax: 886-2-29174598  
URL: http://www.princeton.com.tw  
2W × 2 Class AB Audio Power Amplifier  
PT2303  
HEAT DISSIPATION  
During normal operation, the chip only consumes very little stand-by current. In high output power  
conditions, the package temperature will rise. For proper operating temperature, a modest heat sink  
mounted on the top side of the chip is required. The thermal resistance requirement of the heat sink  
demand may be obtained by the formula below:  
θJA = (TJ (max) - TA)/PDISS  
PDISS = IC dissipation power  
TJ (max) = Maximum chip conjunction temperature  
TA = external environment temperature  
θJA = thermal resistance from chip conjunction to ambience environment  
With 60% estimated efficiency (eff), PT2303 in 2W + 2W output power dissipation is probably  
PDISS = ( Po ÷ eff ) - Po = 2.6W  
The maximum chip conjunction temperature is 150, Exceed this temperature will damage the chip,  
assuming the outside environment air temperature is 50. From the chip conjunction dissipation to  
external environment thermal resistance θJA should be:  
θJA  
= ( 150 – 50 ) ÷ 2.6 = 38.4/W  
The PT2303 chip conjunction to case thermal resistance θJC is 26/W. Therefore the heat sink  
thermal resistance should be:  
θJA - θJC = 12.4/W  
In normal operating, PT2303 needs at least 2 sq inch PCB for heat dissipate; it should be use whole  
copper foil to cover on it for enough heat dissipation space. We suggest using two-layer PCB for better  
heat dissipation. The track connected to the output and power pin of IC should be as thick as possible  
for better heat dissipation ability. If IC doesn’t have enough heat dissipation space (>1 sq inch), and IC  
is always in full power output situation, an additional heat sink should placed on the chip.  
PT2303 V1.2  
- 6 -  
December, 2007