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TDA3665AT データシート(PDF) 8 Page - NXP Semiconductors |
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TDA3665AT データシート(HTML) 8 Page - NXP Semiconductors |
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8 / 20 page  2000 Apr 25 8 Philips Semiconductors Preliminary specification Very low dropout voltage/quiescent current 8.5 V voltage regulator TDA3665 EXAMPLE 1 The regulator is stabilized with an electrolytic capacitor of 68 µF (ESR = 0.5 Ω). At Tamb = −40 °C, the capacitor value is decreased to 22 µF and the ESR is increased to 3.5 Ω. The regulator will remain stable at a temperature of Tamb = −40 °C. EXAMPLE 2 The regulator is stabilized with an electrolytic capacitor of 10 µF (ESR = 3.3 Ω). At Tamb = −40 °C, the capacitor value is decreased to 3 µF and the ESR is increased to 20 Ω. The regulator will remain stable at a temperature of Tamb = −40 °C. EXAMPLE 3 The regulator is stabilized with a 100 nF MKT capacitor connected to the output. When the output current is over 200 µA full stability is guaranteed. Because the thermal influence on the capacitor value is almost zero, the regulator will remain stable at a temperature of Tamb = −40 °C. EXAMPLE 4 The regulator is stabilized with a 100 nF capacitor in parallel with an electrolytic capacitor of 10 µF connected to the output. The regulator is now stable under all conditions and independent of: • The ESR of the electrolytic capacitor • The value of the electrolytic capacitor • The output current. Application circuits The maximum output current of the regulator equals: When Tamb =21 °C and VP = 17.5 V the maximum output current equals 140 mA. The total thermal resistance of the TDA3665 can be decreased from 125 to 50 K/W for the SO8 version. For the SO4 version it can be decreased from 100 to 40 K/W when GND pins 2 and 4 of the package are soldered to the printed-circuit board. 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 TDA3665 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 Fig.7. I REG max () 150 T amb – R th j a – () V P V REG – () × ----------------------------------------------------------- = 150 T amb – 100 V P 8.5 – () × ------------------------------------------ mA () = ndbook, halfpage MBL128 VP 13 2, 4 C2(2) TDA3665 C1 1 µF VREG = 8.5 V Fig.7 Application circuit with backup function (SO4 version). C1 is optional (to minimize supply noise only). C2 ≤ 4700 µF. |
同様の部品番号 - TDA3665AT |
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同様の説明 - TDA3665AT |
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