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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA8926 Datenblatt(PDF) 6 Page - NXP Semiconductors |
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TDA8926 Datenblatt(HTML) 6 Page - NXP Semiconductors |
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6 / 32 page  2002 Oct 10 6 Philips Semiconductors Preliminary specification Power stage 2 × 50 W class-D audio amplifier TDA8926 8 FUNCTIONAL DESCRIPTION The combination of the TDA8926J and the TDA8929T controller 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 TDA8926 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): must be connected to a continuous supply voltage of at least VSS + 5 V with respect to VSS • 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 TDA8926. 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 controller TDA8929T the system is shut down within 1 µs, 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. |
Ähnliche Teilenummer - TDA8926 |
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Ähnliche Beschreibung - TDA8926 |
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