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TDA3661 Datenblatt(PDF) 5 Page - NXP Semiconductors |
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TDA3661 Datenblatt(HTML) 5 Page - NXP Semiconductors |
5 / 16 page 9397 750 15049 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 05 — 28 June 2005 5 of 16 Philips Semiconductors TDA3661 Very low dropout voltage/quiescent current voltage regulator 11.2 Stability The regulator is stabilized with an external capacitor connected to the output. For stable operation: 1. The output capacitor ESR should not exceed 22 Ω (worst case) 2. A maximum ESR may be required; see Table 8 3. It is recommended not to use below 1 mA output current because of reduced phase margin 4. Use electrolytic capacitors for output capacitor values of 1 µF and above. 11.3 Application circuits The maximum output current of the regulator equals: When Tamb =21 °C, VP =14V and VREG = 5 V (k = 4.01929) the maximum output current equals 140 mA. For successful operation of the IC (maximum output current capability) special attention has to be given to the copper area required as heatsink (connected to all GND pins), the thermal capacity of the heatsink and its ability to transfer heat to the external environment. It is possible to reduce the total thermal resistance from 155 K/W to 50 K/W. 11.3.1 Application circuit with backup function Sometimes, a backup function is needed to supply, for example, a microcontroller for a short period of time when the supply voltage spikes to 0 V (or even −1 V). This function can easily be built with the TDA3661 by using an output capacitor with a large value. When the supply voltage is 0 V (or −1 V), only a small current will flow into pin REG from this output capacitor (a few µA). The application circuit is given in Figure 3. Table 8: Minimum ESR values required IREG (mA) C2 = 100 nF C2 = 1 µF C2 = 10 µF C2 = 100 µF 1 > 0 Ω> 1.5 Ω> 0 Ω> 0 Ω 5 > 0 Ω> 0 Ω> 0 Ω> 0 Ω 10 > 0 Ω> 0 Ω> 0 Ω> 0 Ω 100 > 0 Ω> 0 Ω> 0 Ω> 0 Ω I REG max () 150 T amb – R th j a – () V P V REG – () × ----------------------------------------------------------- 150 T amb – 100 V P 5 – () × ------------------------------------ mA () == |
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