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參數(shù)資料
| 型號： | TDF8554J/N2 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 44 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM37 |
| 封裝： | PLASTIC, SOT725-1, 37 PIN |
| 文件頁數(shù)： | 14/56頁 |
| 文件大?。?/td> | 597K |
| 代理商： | TDF8554J/N2 |
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TDF8554J
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 31 August 2011
21 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
The quiescent current has a very low level of 150
A (typical value) with only regulator 2
active. Due to the low voltage operation of the application, low dropout voltage regulators
are used.
All the regulators, except for the standby regulator, can be controlled by the I2C-bus. The
device has in addition to the regulators, two I2C-controlled power switches which are
capable of delivering 400 mA continuous current. This device has several fail-safe
protection modes. This module conforms to peak transient tests and protects against high
continuous voltage (24 V), short-circuits and thermal stress. The standby regulator will
maintain output as long as possible even in thermal shutdown or any other fault condition.
During overvoltage stress, all outputs except regulator
2will shut off and the device is able
to supply a minimum current for an indefinite amount of time allowing sustained memory
for a microprocessor. Also, there is a provision for use of a reserve supply capacitor that
will hold enough energy for regulator 2 to allow a microprocessor to prepare for loss of
voltage.
8.1 Standby regulator output
Regulator 2 is intended as a supply for a microcontroller. It has a low quiescent current
and cannot be switched. This regulator will not shut down with the switched regulators and
cannot be controlled by the I2C-bus. This regulator will not shut down during load dump
transients or high temperature protection.
8.2 Backup capacitor
The backup capacitor (Cbackup) is used as a backup supply for the regulator 2 output when
the battery supply voltage (VP) cannot support the regulator 2 voltage.
8.3 Backup function
A backup function is implemented by a switch which behaves like an ideal diode between
pins VP and BUCAP. The forward voltage of this ideal diode depends on the current
flowing through it. This function allows regulator 2 to be supplied during brief periods when
no supply voltage is present on pin VP. It requires an external capacitor connected to
pin BUCAP and ground. When the supply voltage is present on pin VP this capacitor will
be charged to a level of VP 0.3 V. This charge can now be used to supply regulator 2
when VP is absent for a short time.
(1)
Example: VP =14.4V, VREG2 (voltage on pin REG2) = 5.0 V (N2) or 3.3 V (N4), RL =1k
and Cbackup =100 F providing a tdelay of 178 ms (N2) or 321 ms (N4).
When an overvoltage condition occurs, the voltage on pin BUCAP is limited to
approximately 24 V.
t
delay
C
backup
R
L
V
P
V
REG2
0.5
–
–
V
REG2
----------------------------------------------
=
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