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參數(shù)資料
| 型號： | TDA7454 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 42 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM25 |
| 封裝： | FLEXIWATT-25 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 350K |
| 代理商： | TDA7454 |
Table 1: MODE SELECTION TABLE OPERATION OF THE DEVICE
1) STD/HI-EFF (pin 16 = OPEN)
STANDARD QUAD
BRIDGE MODE
HIGH-EFF QUAD
BRIDGE MODE
STANDARD QUAD
SINGLE-ENDED MODE
ST-BY MODE
100
150
170
Tchip (deg)
2) STD/HI-EFF (pin 16 = GND)
HIGH-EFF QUAD BRIDGE MODE
STANDARD QUAD
SINGLE-ENDED MODE
ST-BY MODE
150
170
Tchip (deg)
3) STD/HI-EFF (pin 16 connected as shown in the figure below.
STANDARD QUAD
BRIDGE MODE OR
HIGH-EFF MODE
(Theatsink dependent)
HIGH-EFF QUAD
BRIDGE MODE
STANDARD QUAD
SINGLE-ENDED MODE
ST-BY MODE
100
150
170
Tchip (deg)
Vref
NTC t(Theatsink)
STD/HI-EFF (pin 16)
D94AU174A
OUTPUT STAGE STABILITY
The TDA7454’s is intrinsically stable and will
properly drive any kind of conventional car-radio
speakers without the need of supplementary out-
put compensation (e.g. Boucherot cells), thus al-
lowing a drastic reduction of the external parts
whose number, abated to the essentials, reflects
that of traditional amplifiers. In this respect, per-
fect pin-to-pin compatibility with the entire Sgs-
Thomson’s 4-BTL family (TDA738X) exists.
STANDARD / HIGH-EFFICIENCY OPERATION
(pin 16)
The TDA7454’s operating mode can be selected
by changing the connection of pin 16, according
to table 1.
At low battery levels (<10 V), the device will auto-
matically turn into STANDARD BRIDGE mode, in-
dependently from the status of pin 16.
Condition # 3 in table 1 is particularly useful when
the TDA7454’s operation has to be conditioned
by the temperature in other more heat-sensitive
devices in the same environment. The NTC resis-
tor is a temperature sensor, to be situated near
the critical part(s), will appropriately drive pin 16
through a low-power transitor.
Initially the
TDA7454 can be set to operate as a STANDARD
BRIDGE, turning into HIGH EFFICIENCY mode
only if overheating is recognised in the critical
spot, thus reducing the overall temperature in the
circuit.
CLIPPING DETECTOR / DIAGNOSTIC (pin 25)
The TDA7454 is equipped with a diagnostic func-
tion whose output is available at pin 25. This pin
requires a pull-up resistor (10 KOhm min.) to a
DC source that may range from 5 V to Vcc. The
following events will be recognized and signaled
out:
Clipping
A train of negative-going pulses will appear, each
of them
syncronized with every single clipping
event taking place in ant of the outputs.
A possible application consists of filtering / inte-
grating the pulses and implement a routine for
automatically reducing / restoring the volume us-
ing microprocessor - driven audioprocessors, to
counteract the clipping sound-damaging effects.
Overheating
Chip temperatures above 150 oC will be signaled
out at pin 25 in the form of longer-lasting pulses,
as the stepping back into the operating tempera-
ture requires some time.
TDA7454
9/13
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