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參數(shù)資料
| 型號： | TDF8546J/N1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 44 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM27 |
| 封裝： | PLASTIC, SOT827-1, 27 PIN |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 511K |
| 代理商： | TDF8546J/N1 |
TDF8546
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 August 2011
10 of 61
NXP Semiconductors
TDF8546
I2C-bus controlled 4
45 W best efficiency amplifier
information, a POR occurs and the amplifier will not restart automatically. In I2C-bus
mode, pin DIAG is pulled LOW to indicate a POR has occurred. In legacy mode, the
amplifier restarts if pin STB remains HIGH.
The device prevents amplifier plops during engine start. To prevent plops on the amplifier
output caused by, for instance, a tuner regulator out of regulation, the voltage on pin STB
can be made zero when an engine start is detected. Pin STB activates the fast mute,
suppressing disturbances at the amplifier inputs.
The built-in low battery voltage mute is the default, and in legacy mode is set to 5.5 V, but
can also be set to 7.2 V via the I2C-bus. If the low battery voltage mute is set to 7.2 V, the
amplifier activates fast mute (400
s) and enters the same cycle when the low V
P mute
was set to 5.5 V: discharge of the ACGND and SVR capacitors when the mute is
completed and start-up when the supply voltage is above 8 V, when no POR has
occurred.
7.3 Best efficiency mode
7.3.1 2- and 4-channel best efficiency principle
Best efficiency mode is intended for signals of amplitude less than half the supply voltage.
It re-uses the current between two channels by adding a switch (see best efficiency mode
in Figure 6). If the two channels in Figure 6 have the same signal, the current from the
supply is, in normal BTL mode, twice the IL current, and in best efficiency mode, only IL. At
the same output power, best efficiency mode needs less power from the supply, resulting
in less power dissipation in best efficiency mode.
Fig 5.
Engine start protection
amplifier re-start
(depends on
I2C-bus content)
t (s)
001aam687
VP
voltage
(V)
14
10
7
6
3.5
UVP
DC output voltage
SVR voltage/DC input voltage
t(start-Vo(off))
t(start-SVRoff)
DC voltage output
not filtered to ensure
headroom
SVR clamp voltage
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