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TDA8588BJ データシート(PDF) 8 Page - NXP Semiconductors |
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TDA8588BJ データシート(HTML) 8 Page - NXP Semiconductors |
8 / 54 page 2004 Feb 24 8 Philips Semiconductors Product specification I2C-bus controlled 4 × 50 Watt power amplifier and multiple voltage regulator TDA8588J; TDA8588xJ FUNCTIONAL DESCRIPTION The TDA8588 is a multiple voltage regulator combined with four independent audio power amplifiers configured in bridge tied load with diagnostic capability. The output voltages of all regulators except regulators 2 and 3 can be controlled via the I2C-bus. However, regulator 3 can be set to 0 V via the I2C-bus. The output voltage of regulator 2 (microcontroller supply) and the maximum output voltage of regulator 3 (mechanical digital and microcontroller supplies) can both be either 5 V or 3.3 V depending on the type number. The maximum output voltages of both regulators are fixed to avoid any risk of damaging the microcontroller that may occur during a disturbance of the I2C-bus. The amplifier diagnostic functions give information about output offset, load, or short-circuit. Diagnostic functions are controlled via the I2C-bus. The TDA8588 is protected against short-circuit, over-temperature, open ground and open VP connections. If a short-circuit occurs at the input or output of a single amplifier, that channel shuts down, and the other channels continue to operate normally. The channel that has a short-circuit can be disabled by the microcontroller via the appropriate enable bit of the I2C-bus to prevent any noise generated by the fault condition from being heard. Start-up At power on, regulator 2 will reach its final voltage when the backup capacitor voltage exceeds 5.5 V independently of the voltage on pin STB. When pin STB is LOW, the total quiescent current is low, and the I2C-bus lines are high impedance. When pin STB is HIGH, the I2C-bus is biased on and then the TDA8588 performs a power-on reset. When bit D0 of instruction byte IB1 is set, the amplifier is activated, bit D7 of data byte 2 (power-on reset occurred) is reset, and pin DIAG is no longer held LOW. Start-up and shut-down timing (see Fig.12) A capacitor connected to pin SVR enables smooth start-up and shut-down, preventing the amplifier from producing audible clicks at switch-on or switch-off. The start-up and shut-down times can be extended by increasing the capacitor value. If the amplifier is shut down using pin STB, the amplifier is muted, the regulators and switches are switched off, and the capacitor connected to pin SVR discharges. The low current standby mode is activated 2 seconds after pin STB goes LOW. Power-on reset and supply voltage spikes (see Fig.13 and Fig.14) If the supply voltage drops too low to guarantee the integrity of the data in the I2C-bus latches, the power-on reset cycle will start. All latches will be set to a pre-defined state, pin DIAG will be pulled LOW to indicate that a power-on reset has occurred, and bit D7 of data byte 2 is also set for the same reason. When D0 of instruction byte 1 is set, the power-on flag resets, pin DIAG is released and the amplifier will then enter its start-up cycle. Diagnostic output Pin DIAG indicates clipping, thermal protection pre-warning of amplifier and voltage regulator sections, short-circuit protection, low and high battery voltage. Pin DIAG is an open-drain output, is active LOW, and must be connected to an external voltage via an external pull-up resistor. If a failure occurs, pin DIAG remains LOW during the failure and no clipping information is available. The microcontroller can read the failure information via the I2C-bus. AMPLIFIERS Muting A hard mute and a soft mute can both be performed via the I2C-bus. A hard mute mutes the amplifier within 0.5 ms. A soft mute mutes the amplifier within 20 ms and is less audible. A hard mute is also activated if a voltage of 8 V is applied to pin STB. Temperature protection If the average junction temperature rises to a temperature value that has been set via the I2C-bus, a thermal protection pre-warning is activated making pin DIAG LOW. If the temperature continues to rise, all four channels will be muted to reduce the output power (soft thermal clipping). The value at which the temperature mute control activates is fixed; only the temperature at which the thermal protection pre-warning signal occurs can be specified by bit D4 in instruction byte 3. If implementing the temperature mute control does not reduce the average junction temperature, all the power stages will be switched off (muted) at the absolute maximum temperature Tj(max). Offset detection Offset detection can only be performed when there is no input signal to the amplifiers, for instance when the external digital signal processor is muted after a start-up. The output voltage of each channel is measured and |
同様の部品番号 - TDA8588BJ |
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同様の説明 - TDA8588BJ |
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