 |
Zakładka z wyszukiwarką danych komponentów |
|
|
Zakładka z wyszukiwarką danych komponentów |
|
TDA3673AT Arkusz danych(PDF) 7 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TDA3673AT Arkusz danych(HTML) 7 Page - NXP Semiconductors |
|
|
7 / 16 page  2000 Feb 01 7 Philips Semiconductors Preliminary specification Very low dropout voltage/quiescent current 3.3 V voltage regulator with enable TDA3673 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. Full stability is guaranteed when the output current is larger then 200 µA. Because the thermal influence on this 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 a 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 = 14 V, the maximum output current equals 116 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 120 to 50 K/W. 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 be easily built with the TDA3673 by using a large output capacitor. When the supply voltage is 0 V (or −1 V), only a small current will flow into pin REG from this large output capacitor (a few µA). The application circuit is given in Fig.6. I REG max () 150 T amb – R th(j-a) V P V REG – () × ------------------------------------------------------ = 150 T amb – 100 V P 3.3 – () × ------------------------------------------ = (mA) ndbook, halfpage MGS596 VP 81 2, 3, 6, 7 C2(2) VI(EN) 5 TDA3673 C1(1) 1 µF VREG = 3.3 V Fig.6 Application circuit with backup function. VI(EN) =5V. (1) C1 is optional (to minimize supply noise only). (2) C2 ≤ 4700 µF. |
Podobny numer części - TDA3673AT |
|
Podobny opis - TDA3673AT |
|
|
|
Link URL |
| Polityka prywatności |
| ALLDATASHEET.PL |
| Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Polish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
