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參數(shù)資料
| 型號(hào)： | 935201690112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 55 W, 2 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封裝： | POWER, PLASTIC, SOT-243-1, DIL-BENT-SIL, 17 PIN |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 149K |
| 代理商： | 935201690112 |
2000 Jan 28
5
Philips Semiconductors
Product specication
2
× 40 W/2 stereo BTL car radio power amplier
with differential inputs and diagnostic outputs
TDA8566Q
Short-circuit diagnostic (pin 15)
When a short-circuit occurs at one or more outputs to
ground or to the supply voltage, the output stages are
switched off until the short-circuit is removed and the
device is switched on again (with a delay of approximately
20 ms after the removal of the short-circuit). During this
short-circuit condition, pin 15 is continuously LOW.
When a short-circuit occurs across the load of one or both
channels, the output stages are switched off for
approximately 20 ms. After approximately 50
s the load
condition is again checked to see if 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 15 is LOW for 20 ms and HIGH for 50
s
(see Fig.4). The power dissipation in any short-circuit
condition is very low.
Temperature pre-warning (pin 15)
When the junction temperature (Tvj) reaches 145 °C,
pin 15 will become continuously LOW.
Open-collector outputs
Pins 4 and 15 are open-collector outputs, therefore more
devices can be tied together. Pins 4 and 15 can also be
tied together. An external pull-up resistor is required.
Differential inputs
The input stage is a high-impedance fully differential
balanced input stage that is also capable of operating in a
single-ended mode with one of the inputs capacitively
coupled to an audio ground. It should be noted that if a
source resistance is added (input voltage dividers) the
CMRR degrades to lower values.
handbook, halfpage
V4
0
VP
Vout
0
t
MGD103
Fig.3 Clip detection waveforms.
handbook, full pagewidth
MGA707
short-circuit over the load
20 ms
50
s
t
VP
current
in
output
stage
V15
Fig.4 Short-circuit diagnostic timing diagram.
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