 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
TEA1205 Datasheet(PDF) 11 Page - NXP Semiconductors |
|
||||||||||||||||||||||||||||||
TEA1205 Datasheet(HTML) 11 Page - NXP Semiconductors |
|
|
11 / 16 page  1998 Mar 24 11 Philips Semiconductors Preliminary specification High efficiency DC/DC converter TEA1205AT APPLICATION INFORMATION Fig.8 Complete application for upconversion. handbook, full pagewidth MGM701 C1 L1 C2 D1 SENSE OUT VO TEA1205AT LX GND VSEL SYNC SHDWN VI ILIM Rlim A typical component choice for an upconverter from 3 NiCd cells or one Li-ion cell to 5.0 V in a GSM handset (peak power 7.5 W, peak current 2.7 A) is (see Fig.8): • L1 = 10 µH; Isat > 2.3 A; low DC resistance, e.g. Coilcraft DO3308-103 • C1 = 100 µF; low ESR capacitor; necessity depends on type of input voltage source • C2 = 330 µF; ESR = 0.1 Ω; e.g. Sprague 595D series • D1; medium power Schottky diode; e.g. Philips PRLL5819. For lower power applications, the Isat and RDC values of the inductor can be scaled back by the scaling factor of the output current from the values above. The same holds for the ESR value of the output capacitor. A further improvement is increase of inductance and decrease of output capacitance. An additional circuit to prevent start-up deadlock in upconversion is shown in Fig.9. The function of TR1, R1 and R2 is to put the converter into shut-down mode when the input source is suddenly disconnected. The circuit operates as follows. When VI is present, TR1 conducts and the SHDWN pin is kept LOW. As soon as VI falls below 1 V, TR1 no longer conducts and the device is put into shut-down before VO falls below 2 V. In the event that a signal is available which indicates the presence of the input voltage source, this signal should be applied to the SHDWN pin. TR1, R1 and R2 should be omitted in that case. More application information can be found in the associated application note. Fig.9 External deadlock prevention circuit. handbook, halfpage MGK930 SHDWN TR1 R1 1 M Ω R2 2.7 M Ω VO VI |
Número de pieza similar - TEA1205 |
|
Descripción similar - TEA1205 |
|
|
|
Enlace URL |
| Política de Privacidad |
| ALLDATASHEET.ES |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |
Spanish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
