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WM8959 bảng dữ liệu(PDF) 9 Page - Wolfson Microelectronics plc

tên linh kiện WM8959
Giải thích chi tiết về linh kiện  Mobile Multimedia DAC with Dual-Mode Class AB/D Speaker Driver
PDF  155 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8959 bảng dữ liệu(HTML) 9 Page - Wolfson Microelectronics plc

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Pre-Production
WM8959
w
PP, May 2008, Rev 3.1
9
SPEAKER POWER DE-RATING CURVE
The speaker driver has been designed to drive a maximum of 1W into 8
Ω with a 5V supply.
However, thermal restrictions defined by the W-CSP package ӨJA limit the amount of power that can
be safely dissipated in the device without exceeding the maximum operating junction temperature.
Power dissipated in the device correlates directly with speaker efficiency, hence there are separate
de-rating curves for class D and class AB operation.
Under no circumstances should the recommended maximum powers be exceeded.
CLASS D DE-RATING CURVES
The de-rating curves shown in Figure 2 are based on a full scale sinusoidal input.
P
[W]
T
[ºC]
80
70
60
0.4
0.6
0.8
1.0
SPKVDD = 2.7V
SPKVDD = 3V
SPKVDD = 3.3V
SPKVDD = 3.6V
SPKVDD = 4.2V
SPKVDD = 5V
SPKVDD = 5.5V
0.9
0.7
0.3
0.5
0.1
0.2
55
65
75
85
Figure 2 Class D Speaker Power De-Rating Curve



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