參數(shù)資料
型號(hào)： TDA8561TH
廠商： NXP SEMICONDUCTORS
元件分類： 音頻／視頻放大
英文描述： 12 W, 4 CHANNEL, AUDIO AMPLIFIER, PDSO20
封裝： PLASTIC, HSOP-20
文件頁(yè)數(shù)： 20/24頁(yè)
文件大小： 128K
代理商： TDA8561TH
2000 Feb 18
5
Philips Semiconductors
Preliminary specication
2
× 24 W BTL or 4 × 12 W single-ended
car radio power amplier
TDA8561TH
When a short-circuit across the load of one or both
channels occurs the output stages are switched off for
approximately 20 ms. After that time it is checked during
approximately 50
s to see whether the short-circuit is still
present. Due to this duty cycle of 50
s/20 ms the average
current consumption during this short-circuit condition is
very low (approximately 40 mA).
During this short-circuit condition, pin 2 is LOW for 20 ms
and HIGH for 50
s (see Fig.5).
The power dissipation in any short-circuit condition is very
low.
TEMPERATURE DETECTION
When the virtual junction temperature Tvj reaches 150 °C,
pin 2 will be active LOW.
OPEN-COLLECTOR OUTPUT
Pin 2 is an open-collector output, which allows pin 2 of
more devices being tied together.
Fig.3
Distortion detector waveform; bridge-tied
load application.
handbook, halfpage
0
t
MGK906
VP
VO
V2
Fig.4
Distortion detector waveform; single-ended
application.
handbook, halfpage
0
t
0
MGK907
VP
VO
V2
Fig.5 Short-circuit waveform.
handbook, full pagewidth
MGK908
short-circuit over the load
20 ms
50
s
t
VP
current
in
output
stage
V2
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