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TDA3608Q Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA3608Q Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 22 page 2003 Nov 28 6 Philips Semiconductors Product specification Multiple voltage regulators with switch TDA3608Q; TDA3608TH FUNCTIONAL DESCRIPTION The TDA3608 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 in the TDA3608. Backup supply The charge of the backup capacitor connected to pin BU can be used to supply regulator 2 for a short period when the supply voltage VP drops to 0 V (the time depends on the value of the capacitor). Regulator 1 When the output voltage of regulator 2 and the supply voltage (VP > 4.5 V) are both available, regulator 1 can be operated by means of enable pin EN1 (see Fig.4). Regulator 2 Regulator 2 switches on (see Fig.5) when the backup voltage exceeds 6.5 V for the first time and switches off when the output voltage of regulator 2 drops below 1.9 V (this is far below an engine start). Regulator 3 When the output voltage of regulator 2 and the supply voltage (VP > 4.5 V) are both available, regulator 3 can be operated by means of enable pin EN3 (see Fig.4). Reset When regulator 2 is switched on and the output voltage of this regulator is within its voltage range, the reset output (see Fig.5) will be enabled (pin RES goes HIGH through an external pull-up resistor) to generate a reset to the microcontroller. The reset cycles can be extended by means of an external capacitor connected to pin CRES. This start-up feature is included to secure a smooth start-up of the microcontroller at first connection, without uncontrolled switching of regulator 2 during the start-up sequence. Hold Regulator 1 has an open-collector hold output (see Fig.4) indicating that the output voltage is settled at 8.5 V. Pin HOLD is held HIGH by an external pull-up resistor. When the supply voltage VP drops or during high load, the output voltage drops out-of-regulation and pin HOLD goes LOW. The hold output is only activated when VREG3 > 1.3 V. When pin HOLD is connected via a pull-up resistor to the output of regulator 3 spikes will be minimized to 1.3 V (maximum value) because the hold output is only disabled when VREG3 < 1.3 V. Pin HOLD will be forced LOW when the load dump protection is activated and also in the standby mode. Power switch The power switch can be controlled by means of enable pin ENSW (see Fig.6). Protections All output pins are fully protected. The regulators are protected against load dump (regulator 1 and regulator 3 switch off at VP > 18 V) and short-circuit (foldback current protection). The power switch contains a foldback current protection, but this protection is delayed at a short-circuit condition by the reset delay capacitor. During this time the output current is limited to at least 2 A (peak value) and 1.8 A (continuous value) at VP ≤ 18 V. During the foldback mode the current is limited to 0.5 A (typical value). The timing diagram is shown in Fig.7. The foldback protection is activated when VSW <4V. When regulator 2 is out-of-regulation and generates a reset, the power switch is in the foldback mode immediately when VSW <4V. In the standby mode the voltage on the reset delay capacitor is about 4 V and the voltage on the power switch output is VP − 0.45 V (typical value) at ISW = 1 A. During an overload condition or short-circuit the reset delay capacitor will be charged to a higher voltage. The power switch is in the high current mode while the capacitor is charged, after this the switch is in the foldback mode (VSW < 4 V). While the reset delay capacitor is charged the power switch output can reach its correct output voltage. Now the voltage on the reset delay capacitor is decreased rapidly to 4 V. The reset output voltage is not influenced by this change of voltages. The time of the high current mode depends on the value of the reset delay capacitor. At VP > 18 V the power switch is clamped at maximum 17.2 V (to avoid that external connected circuitry is being damaged by an overvoltage) and the power switch will switch off at load dump. |
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