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TDA8591 Fiches technique(PDF) 7 Page - NXP Semiconductors |
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TDA8591 Fiches technique(HTML) 7 Page - NXP Semiconductors |
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7 / 36 page  2002 Jan 14 7 Philips Semiconductors Preliminary specification 4 × 44 W into 4 Ω or 4 × 75 W into 2 Ω quad BTL car radio power amplifier TDA8591J 7 FUNCTIONAL DESCRIPTION The TDA8591J is an audio power amplifier with four independent Bridge Tied Load (BTL) amplifiers with high output power and low distortion. The gain of each amplifier is fixed at 26 dB. The TDA8591J has two-pin mode control which allows the amplifiers to be switched to standby (off) with the STBY pin, and the MUTE/ON pin to be used to switch between mute mode (input signal suppressed) and amplifier operating mode. Special attention is paid to dynamic behaviour: • A fast mute that switches all amplifiers to mute mode at low supply voltage and suppresses noise during engine start • No plops when switching between standby and mute modes • Slow offset change when switching from mute mode to operating mode (can be adjusted by an external capacitor) • A fast mute function by discharging the external mute capacitor quickly The following protection circuits are included to prevent the IC from being damaged: • Thermal shutdown: At junction temperature Tvj > 170 °C, all power stages are switched off to prevent a further increase in temperature • Soft thermal clipping: At junction temperature Tvj > 155 °C, the gain reduces as temperature increases, resulting in less output power and decreasing temperature and therefore no thermal shutdown (no break in the audio) • Short-circuit protection: If a short-circuit to ground or supply voltage occurs at one or more of the output pins, or across the load of one or more of the channels, the following action occurs to reduce power dissipation and case temperature (see Figs 5 and 6): – All amplifiers switch off for approximately 20 ms – After 20 ms the amplifiers switch on again – If the short-circuit persists, the amplifiers switch off for another 20 ms period and the action repeats • ESD protection: – Human body model 2000 V – Machine model 200 V • Protection against open ground pins and outputs short-circuited to supply ground (see Fig.30) • All outputs protected are against open power supply pins and outputs short-circuited to power supply voltage (see Fig.31) • With a reversed polarity power supply an external diode conducts and a fuse blows and therefore the reversed polarity voltage will not damage the device (see Fig.32). 7.1 Diagnostic facility A diagnostic facility is available from the status of pin DIAG for the following conditions: • In normal operation, the level on the DIAG pin is continuously HIGH (see Fig.3) • When a temperature pre-warning occurs due to the junction temperature Tvj reaching 145 °C, the DIAG pin goes continuously LOW • When there is distortion over 2.5% because of clipping, the DIAG pin has a pulsed output as shown in Fig.4 • When a short-circuit is detected, the short-circuit protection becomes active and DIAG goes continuously LOW for the period of the short-circuit (see Figs 5 and 6) • With an extreme output offset, input leakage current causes a DC output offset voltage and results in power dissipation in the loudspeakers. Therefore, if the DC output offset voltage of a bridge is larger than 2 V, DIAG is pulled LOW to indicate an error condition. The DIAG pin has an open-drain output to allow several devices to be tied together. An external pull-up resistor is needed. |
Numéro de pièce similaire - TDA8591 |
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Description similaire - TDA8591 |
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