參數(shù)資料
型號(hào)： TDA8924
廠商： NXP Semiconductors N.V.
英文描述： 2 x 120 W class-D power amplifier
中文描述： 2 × 120瓦D類功率放大器
文件頁(yè)數(shù)： 8/35頁(yè)
文件大?。?/td> 722K
代理商： TDA8924
2003 Jul 28
8
Philips Semiconductors
Objective specification
2
×
120 W class-D power amplifier
TDA8924
In an application circuit:
Internal oscillator: R
OSC
connected from pin OSC to V
SS
External oscillator: connect oscillator signal between pin
OSC and SGND; delete R
OSC
and C
OSC
.
8.3
Protections
Temperature, supply voltage and short-circuit protection
sensors are included on the chip. In the event that the
maximum current or maximum temperature is exceeded
the system will shut down.
8.3.1
O
VER
-
TEMPERATURE
If the junction temperature (T
j
) exceeds 150
°
C, then the
power stage will shut down immediately. The power stage
will start switching again if the temperature drops to
approximately 130
°
C, thus there is a hysteresis of
approximately 20
°
C.
8.3.2
S
HORT
-
CIRCUIT ACROSS THE LOUDSPEAKER
TERMINALS AND TO SUPPLY LINES
When the loudspeaker terminals are short-circuited or if
one of the demodulated outputs of the amplifier is
short-circuited to one of the supply lines this will be
detected by the current protection. If the output current
exceeds the maximum output current of 12 A, then the
power stage will shut down within less than 1
μ
s and the
high-current will be switched off. In this state the
dissipation is very low. Every 100 ms the system tries to
restart again. If there is still a short-circuit across the
loudspeaker load or to one of the supply lines, the system
is switched off again as soon as the maximum current is
exceeded. The average dissipation will be low because of
this low duty cycle.
8.3.3
S
TART
-
UP SAFETY TEST
During the start-up sequence, when the mode pin is
switched from standby to mute, the condition at the output
terminals of the power stage are checked. In the event of
a short-circuit at one of the output terminals to V
DD
or V
SS
thestart-upprocedureisinterruptedandthesystemswaits
for open-circuit outputs. Because the test is done before
enablingthepowerstages,nolargecurrentswillflowinthe
event of a short-circuit. This system protects for
short-circuitsatbothsidesoftheoutputfiltertobothsupply
lines. When there is a short-circuit from the power PWM
output of the power stage to one of the supply lines (before
the demodulation filter) it will also be detected by the
start-up safety test. Practical use of this test feature can be
found in detection of short-circuits on the printed-circuit
board.
Remark:
This test is only operational prior to or during the
start-up sequence, and not during normal operation.
During normal operation the maximum current protection
is used to detect short-circuits across the load and with
respect to the supply lines.
8.3.4
S
UPPLY VOLTAGE ALARM
If the supply voltage falls below
±
12.5 V the undervoltage
protection is activated and the system shuts down
correctly. If the internal clock is used, this switch-off will be
silent and without plop noise. When the supply voltage
rises above the threshold level the system is restarted
again after 100 ms. If the supply voltage exceeds
±
32 V
the overvoltage protection is activated and the power
stages shut down. They are re-enabled as soon as the
supply voltage drops below the threshold level.
It has to be stressed that the overvoltage protection only
protects against damage due to supply pumping effects;
see Section 16.7. Apart from the power stages, the rest of
the circuitry remains connected to the power supply. This
means, that the supply itself should never exceed 30 V.
An additional balance protection circuit compares the
positive (V
DD
) and the negative (V
SS
) supply voltages and
is triggered if the voltage difference between them
exceeds a certain level. This level depends on the sum of
both supply voltages. An expression for the unbalanced
threshold level is as follows: V
th(unb)
~ 0.15
×
(V
DD
+ V
SS
).
Example
: With a symmetrical supply of
±
30 V the
protection circuit will be triggered if the unbalance exceeds
approximately 9 V; see also Section 16.7.
8.4
Differential audio inputs
For a high common mode rejection ratio and a maximum
of flexibility in the application, the audio inputs are fully
differential. By connecting the inputs anti-parallel the
phase of one of the channels can be inverted, so that a
load can be connected between the two output filters.
In this case the system operates as a mono BTL amplifier
and with the same loudspeaker impedance an
approximately four times higher output power can be
obtained.
The input configuration for mono BTL application is
illustrated in Fig.5; for more information see Chapter 16.
In the stereo single-ended configuration it is also
recommended to connect the two differential inputs in
anti-phase. This has advantages for the current handling
of the power supply at low signal frequencies.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA8924TH 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 120 W class-D power amplifier
TDA8924TH/N2,118 功能描述:IC AMP AUDIO PWR 240W D 24HSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR)
TDA8925 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Power stage 2 x 15 to 25Wclass-D audio amplifier
TDA8925J 制造商:Panasonic Industrial Company 功能描述:IC
TDA8925J/N1,112 功能描述:IC AMP AUDIO PWR 20W STER 17SIL RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR)
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