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TDA3682ST 数据表(PDF) 6 Page - NXP Semiconductors |
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TDA3682ST 数据表(HTML) 6 Page - NXP Semiconductors |
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6 / 20 page  2002 Mar 11 6 Philips Semiconductors Product specification Multiple voltage regulator with power switches TDA3682 Table 1 Enable control pin EN1 Table 2 Enable control pin EN2 Table 3 Enable control pin EN3 Protections All output pins are fully protected against load dump and short-circuit (foldback current protection); see Fig.3. At load dump all regulator outputs will go low, except the output of regulator 2 (BU5V). The power switches can withstand ‘loss of ground’. This means that the ground pin is disconnected and the switch output is connected to ground. Backup function A backup function is present. This is realized by a switch function which acts like a sort of ideal diode between pins VP2 and STCP. The forward voltage of this ideal diode depends on the current flowing through this diode. This function makes it possible to supply regulator 2 (BU5V) when no supply voltage is present on pin VP2. A special application can be made using a backup function by connecting a capacitor between pin STCP and ground. When the supply voltage is present on pin VP2 this capacitor will be charged to a level of VP2 − 0.3 V. This charge can now be used to supply regulator 2 for a short period of time when VP2 is switched to 0 V. The delay time can be calculated using the formula: Example: VP2 = 14.4 V, VREG2 = 5 V, RL =1kΩ and Cbackup = 100 µF results in a delay time of 177 ms. When an overvoltage condition occurs, the voltage on pin STCP will be limited to approximately 18 V. EN1 REGULATOR OUTPUT REG1 L off Hon EN2 REGULATOR OUTPUTS REG3 REG4 REG5 L off off off M on off on H on on off EN3 POWER SWITCHES SW1 SW2 L off off M off on Hon on MGT170 Vo(REG) Isc Io(REG) Im Fig.3 Foldback current protection. t delay C backup R L V P2 V REG2 – 0.5 – V REG2 ----------------------------------------------- × × = |
类似零件编号 - TDA3682ST |
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类似说明 - TDA3682ST |
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