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TDA3603P Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA3603P Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 20 page 1997 Aug 15 6 Philips Semiconductors Product specification Multiple voltage regulator with switch TDA3603 FUNCTIONAL DESCRIPTION The TDA3603 is a multiple output voltage regulator with a power switch, intended for use in car radios with or without a microcontroller. Because of low-voltage operation of the car radio, low-voltage drop regulators are used. Regulator 2 will switch on when the supply voltage exceeds 6.5 V for the first time and will switch off again when the output voltage of regulator 2 is below 1.9 V (this is below an engine start). When regulator 2 is switched on and the output voltage of this regulator is within its voltage range, the reset output will be enabled (reset will go HIGH via a pull-up resistor) to generate a reset to the microcontroller. The reset cycles can be extended by an external capacitor at the reset output (pin 3). The start-up feature is built-in to ensure a smooth start-up of the microcontroller at first connection, without uncontrolled switching of regulator 2 during the start-up sequence. When both regulator 2 and the supply voltage (VP > 4.5 V) are available, regulator 1 and the switch can be operated by an enable input (pin 4). All output pins are fully protected. The regulators are protected against load dump (regulator 1 will switch off at supply voltages higher than 25 V) and short-circuit (foldback current protection). The switch contains a current protection which is delayed for ≥10 ms (in short-circuit condition). During this time the current is limited to 1.4 A (VP ≤ 18 V). At supply voltages over 16.9 V the switch is clamped at 15.0 V (to avoid externally connected circuitry being damaged by an overvoltage) and the switch will switch off at load dump. Interfacing with the microcontroller can be accomplished by an ignition Schmitt trigger and ignition output buffer, (simple full/semi on/off logic applications). The total timing of a semi on/off logic set is shown Fig.4. |
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