Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA8589AJ Datenblatt(PDF) 11 Page - NXP Semiconductors |
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TDA8589AJ Datenblatt(HTML) 11 Page - NXP Semiconductors |
11 / 55 page 2004 Feb 24 11 Philips Semiconductors Product speci cation I2C-bus controlled 4 45 Watt power ampli er and multiple voltage regulator TDA8589J; TDA8589xJ VOLTAGE REGULATORS The voltage regulator section contains: Four switchable regulators and one permanent active regulator Two power switches with loss-of-ground protection Reset push-pull output Backup functionality. The quiescent current condition has a very low current level of 150 A typical with only regulator 2 active. The TDA8589 uses low dropout voltage regulators for use in low voltage applications. All of the voltage regulators except for the standby regulator can be controlled via the I2C-bus. The voltage regulator section of this device has two power switches which are capable of delivering unregulated 400 mA continuous current, and has several fail-safe protection modes. It conforms to peak transient tests and protects against continuous high voltage (24 V), short-circuits and thermal stress. A reset warning signal is asserted if regulator 2 is out of regulation. Regulator 2 will try to maintain output for as long as possible even if a thermal shut-down or any other fault condition occurs. During overvoltage stress conditions, all outputs except regulator 2 will switch off and the device will be able to supplya minimum current for an indefinite amount of time sufficient for powering the memory of a microcontroller. Provision is made for an external reserve supply capacitor to be connected to pin BUCAP which can store enough energy to allow regulator 2 to supply a microcontroller for a period long enough for it to prepare for a loss-of-voltage. Regulator2 Regulator 2 is intended to supply the microcontroller and has a low quiescent current. This supply cannot be shut down in response to overvoltage stress conditions, and is notI2C-bus controllable to prevent the microcontroller from being damaged by overvoltage which could occur duringa disturbance of theI2C-bus. This supply will not shut down during load dump transients or during a high thermal-protection condition. Backup capacitor The backup capacitor is used as a backup supply for the regulator 2 output when the battery supply voltage (VP) cannot support the regulator 2 voltage. Backup function The backup function is implemented by a switch function, which behaves like an ideal diode between pinsVP and BUCAP; the forward voltage of this ideal diode depends on the current flowing through it. The backup function supplies regulator 2 during brief periods when no supply voltage is present on pinVP. It requires an external capacitor to be connected to pin BUCAP and ground. When the supply voltage is present on pinVP this capacitor will be charged toa level ofVP 0.3 V. When the supply voltage is absent from pinVP, this charge can then be used to supply regulator 2 for a brief period (tbackup) calculated using the formula: Example: VP = 14.4 V, VO(REG2) =5 V, RL =1k and Cbackup = 100 F provides a tbackup of 177 ms. When an overvoltage condition occurs, the voltage on pin BUCAP is limited to approximately 24 V; see Fig.5. t backup C backup R L V P V O REG2 0.5 – – V O REG2 --------------------------------------------------------- = |
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