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)： 3/56頁
文件大?。?/td> 597K
代理商： TDF8554J/N2
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
11 of 56
NXP Semiconductors
TDF8554J
4
45 W power amplifier with multiple voltage regulator
7.4 Protection
7.4.1 Output protection and short-circuit protection
If a short-circuit to ground, VP or across the load occurs on one or more amplifier outputs,
only the amplifier with the short will be switched off. The channel that has a short-circuit
and the type of short-circuit can be read via the I2C-bus. Pin DIAG is pulled LOW to
indicate there is a problem. The window protection prevents a restart of the channel with a
short to ground or battery. With a short across the load the amplifier is switched on again
after 15 ms to check if the short across the load is still present. If the short-circuit
conditions are still present, the channel is switched off. If several channels have a short
across the load at the same time, the channels are switched on one by one to prevent
high supply current switching with four shorts across the load at the same time. The 15 ms
cycle reduces power dissipation. To prevent audible distortion, the amplifier channel with
the short can be disabled via the I2C-bus.
7.4.2 Loss-of-ground/loss of VP failure
Loss-of-ground/loss of VP is a double-fault condition: the ground (or VP) wire of the set is
not connected and the ground (or VP) wire is connected to one of the loudspeaker
outputs. In this situation the supply capacitor in the set is charged through the body diode
of the output power transistor. This body diode (between the drain and the source of the
power transistor) is always present in amplifiers with MOS output stages. The capacitor
charge current depends on the series impedance of the supply lines, the output
impedance of the loss-of-ground tester and the value of the capacitor; see Figure 5. To
simulate a worst-case condition, the loss-of-ground tester is equipped with a buffer
capacitor of 116 mF to simulate a very low output impedance. With a RS of 63 m, peak
currents of more than 70 A have been measured.
(1) Capacitor value can be 2200
F to 10000 F.
(2) Amplifier output stage.
Fig 5.
Test circuit for loss-of-ground test
Cbuffer
116 mF
NMOS
80N03L
VP
RS
2200 μF
Vpulse
(1)
(2)
5
7
9
17
19
21
23
3
001aam695
Loss-of-ground tester
DUT in application
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