參數(shù)資料
型號(hào)： CS35L00-CNZ
廠商： CIRRUS LOGIC INC
元件分類： 音頻／視頻放大
中文描述： 2.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10
封裝： 3 X 3 MM, LEAD FREE, MO-220, DFN-10
文件頁(yè)數(shù)： 26/34頁(yè)
文件大?。?/td> 730K
代理商： CS35L00-CNZ
CS35L00
32
DS906PP1
8.4.1
Determining Maximum Ambient Temperature
To determine (to a first order approximation) the maximum ambient temperature in which the CS35L00
will operate, the following equations can be used:
Where:
Tmax = The maximum ambient temperature in which the device can operate.
Top = The operating temperature of the device, given a dissipated power “Pmax” and a known thermal
impedance “
θJA”.
TTE = The Over-Temperature Error Threshold, given in the “Characteristics & Specifications” section on
θJA = The thermal impedance of the device and PCB. (This value is highly subjective to a number of ap-
plication specific scenarios. The numbers given in Table 2 on page 31 can be used for a first order ap-
proximation, but proper characterization of the application’s specific PCB and supporting mechanicals is
needed to increase the accuracy of the result achieved here.)
Pmax = The maximum power at which the amplifier will be operated continuously. (For conservative esti-
mates, the 10% THD+N rated power given in “Characteristics & Specifications” section on page 8 can be
used. However, this method will predict higher operating temperatures than what may be seen in the ap-
plication, since power content of audio signals is much smaller than that of the sine wave used to establish
the power specifications.)
η = The efficiency of the device at the power Pmax. (A safe, conservative assumption is 85%)
T
op
θ
JA
1
η
–
() P
×
max
()
×
=
T
max
T
TE
T
op
–
=
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