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參數(shù)資料
| 型號： | TDA8925ST |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Power stage 2 x 15 to 25Wclass-D audio amplifier |
| 中文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM17 |
| 封裝： | PLASTIC, SOT-577-2, DIL-BENT-SIL, 17 PIN |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 214K |
| 代理商： | TDA8925ST |
2004 May 06
6
Philips Semiconductors
Product specification
Power stage 2 x 15 to 25 W class-D
audio amplifier
TDA8925
8
FUNCTIONAL DESCRIPTION
The TDA8925 is a two-channel audio power amplifier
system using the class-D technology (see Fig.1).
The power stage TDA8925S is used for driving the
loudspeaker load. It performs a level shift from the
low-power digital PWM signal, at logic levels, to a
high-power PWM signal that switches between the main
supply lines. A 2nd-order low-pass filter converts the PWM
signal into an analog audio signal across the loudspeaker.
8.1
Power stage
The power stage contains the high-power DMOS
switches,thedrivers,timingandhandshakingbetweenthe
power switches and some control logic (see Fig.1). For
protection, a temperature sensor and a maximum current
detector are built-in on the chip.
The following functions are available:
Switch (pins SW1 and SW2): digital inputs; switching
from V
SS
to V
SS
+ 12 V and driving the power DMOS
switches
Release (pins REL1 and REL2): digital outputs;
switching from V
SS
to V
SS
+ 12 V; follow SW1 and SW2
with a small delay. Note: for self oscillating applications
this pin is not used.
Power-up (pin POWERUP): must be connected to a
continuous supply voltage of at least V
SS
+ 5 V with
respect to V
SS
Enable (pins EN1 and EN2): digital inputs; at a level
of V
SS
the power DMOS switches are open and the
PWM outputs are floating; at a level of V
SS
+ 12 V the
power stage is operational
Diagnostics (pin DIAG): digital open-drain output; pulled
to V
SS
if the temperature or maximum current is
exceeded.
8.2
Protection
Temperature and short-circuit protection sensors are
included in the TDA8925. In the event that the maximum
current or maximum temperature is exceeded the
diagnostic output is pulled down to V
SS
. Since the
diagnostic is connected to the enable pins in the
application the system shuts down itself.
8.2.1
O
VERTEMPERATURE
If the junction temperature (T
j
) exceeds 150
°
C, then
pin DIAG becomes LOW. The diagnostic pin is released if
the temperature is dropped to approximately 130
°
C, so
there is a hysteresis of approximately 20
°
C.
8.2.2
S
HORT
-
CIRCUIT ACROSS THE LOUDSPEAKER
TERMINALS
When the loudspeaker terminals are short-circuited this
will be detected by the current protection. If the output
current exceeds the maximum output current of 3 A, then
pin DIAG becomes LOW. Using pin DIAG in combination
with the enable pins the system will shut down
immediately,andrestartagain.Theresultisthattheoutput
current is limited at the overcurrent detection level.
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|---|---|
| TDA8925ST/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 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風(fēng)，靜音，短路保護，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) |
| TDA8926 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Power stage 2 x 50 W class-D audio amplifier |
| TDA8926J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Power stage 2 x 50 W class-D audio amplifier |
| TDA8927 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
| TDA8927J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
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