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参数资料
| 型号： | TDA8926TH |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 50 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | PLASTIC, SOT-566-3, HSOP-24 |
| 文件页数： | 25/28页 |
| 文件大小： | 233K |
| 代理商： | TDA8926TH |
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2002 Oct 22
6
Philips Semiconductors
Preliminary specication
Power stage 2
× 50 W class-D audio
amplier
TDA8926TH
8
FUNCTIONAL DESCRIPTION
The combination of the TDA8926TH and the controller
TDA8929T produces a two-channel audio power amplifier
system using the class-D technology (see Fig.3). In the
TDA8929T controller the analog audio input signal is
converted into a digital Pulse Width Modulation (PWM)
signal.
The power stage TDA8926TH is used for driving the
low-pass filter and 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.
For a description of the controller, see data sheet
“TDA8929T, Controller class-D audio amplifier”.
8.1
Power stage
The power stage contains the high-power DMOS
switches, the drivers, timing and handshaking between the
power switches and some control logic. For protection, a
temperature sensor and a maximum current detector are
built-in on the chip.
For interfacing with the controller chip the following
connections are used:
Switch (pins SW1 and SW2): digital inputs; switching
from VSS to VSS + 12 V and driving the power DMOS
switches
Release (pins REL1 and REL2): digital outputs;
switching from VSS to VSS + 12 V; follow SW1 and SW2
with a small delay
Enable (pins EN1 and EN2): digital inputs; at a level of
VSS the power DMOS switches are open and the PWM
outputs are floating; at a level of VSS + 12 V the power
stage is operational and controlled by the switch pin if
pin POWERUP is at VSS +12V
Power-up (pin POWERUP): analog input; at LOW level
with respect to VSS the device is in standby mode and
the supply current is practically zero. With a HIGH level
on this pin, the device is in operating mode
Diagnostics (pin DIAG): digital open-drain output; pulled
to VSS if the temperature or maximum current is
exceeded.
8.2
Protection
Temperature and short-circuit protection sensors are
included in the TDA8926TH. The protection circuits are
operational only in combination with the controller
TDA8929T. In the event that the maximum current or
maximum temperature is exceeded the diagnostic output
is activated. The controller has to take appropriate
measures by shutting down the system.
8.2.1
OVERTEMPERATURE
If the junction temperature (Tj) 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
SHORT-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 5 A, then
pin DIAG becomes LOW. The controller should shut down
the system to prevent damage. Using the TDA8929T the
system is shut down within 1
s, and after 220 ms it will
attempt to restart the system again. During this time the
dissipation is very low, therefore the average dissipation
during a short circuit is practically zero.
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相关代理商/技术参数 |
参数描述 |
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| TDA8927 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
| TDA8927J | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
| TDA8927ST | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
| TDA8927TH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Power stage 2 x 80 W class-D audio amplifier |
| TDA8928J | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Power stage 2 x 10 or 1 x 20 W class-D audio amplifie |
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