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參數(shù)資料
| 型號： | 935260595112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 70 W, 1 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封裝： | POWER, PLASTIC, SOT-243-1, DIL-BENT-SIL, 17 PIN |
| 文件頁數(shù)： | 21/23頁 |
| 文件大小： | 163K |
| 代理商： | 935260595112 |
1998 Apr 07
7
Philips Semiconductors
Preliminary specication
70 W high efciency power amplier
with diagnostic facility
TDA1562Q
Diagnostic output (pin DIAG)
DYNAMIC DISTORTION DETECTOR (DDD)
At the onset of clipping of the output stages, the DDD
becomes active. This information can be used to drive a
sound processor or DC-volume control to attenuate the
input signal and so limit the distortion.
SHORT-CIRCUIT PROTECTION
When a short-circuit occurs at the outputs to ground or to
the supply voltage, the output stages are switched off.
They will be switched on again approximately 20 ms after
removing the short-circuit. During this short-circuit
condition the diagnostic output is continuously LOW.
When a short-circuit occurs across the load, the output
stages are switched off during approximately 20 ms. After
that time is checked during approximately 50
s whether
the short-circuit is still present. During this short-circuit
condition the diagnostic output is LOW for 20 ms and high
for 50
s. The power dissipation in any short-circuit
condition is very low.
TEMPERATURE DETECTION
Just before the temperature protection becomes active the
diagnostic output becomes continuously LOW.
Load detection: directly after the circuit is switched from
standby to mute or on, a build in detection circuit checks
whether a load is present. The results of this check can be
detected at the diagnostic output, by switching the mode
select input in the mute mode.
Since the diagnostic output is an open collector output,
more devices can be tied together.
Fig.4 Diagnostic information.
handbook, full pagewidth
HIGH
MID
LOW
mode select
input
diagnostic
output
output voltage
across load
0
HIGH
LOW
no load
clipping signal
short-circuit to
supply or ground
short-circuit
across load
t
MGL265
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