Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
TEA1103T Datasheet(PDF) 8 Page - NXP Semiconductors |
|
TEA1103T Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 28 page 1999 Jan 27 8 Philips Semiconductors Preliminary specification Fast charge ICs for NiCd and NiMH batteries TEA1103; TEA1103T; TEA1103TS To avoid modulation on the output voltage, the top-off charge current is DC regulated, defined by the following equation: (3) where: (4) The top-off charge current will be approximately 0.15CA, which maximizes the charge in the battery under safe and slow charging conditions. The top-off charge period will be approximately one hour, so the battery will be extra charged with approximately 0.15 Q. In this way the battery is fully charged before the system switches over to standby. When pin 1 (Vstb) is connected to VS, or no NTC is connected the system compensates the (self) discharge of the battery by trickle charge. The trickle charge current will be pulsating, defined by the following equation: (5) During the non current periods at trickle charge the charge current is regulated to zero, so that the current for a load connected in series across the battery with the sense resistor will be supplied by the power supply and not by the battery. If at pin 1 (Vstb) a reference voltage is set in accordance with the specification, and no NTC is connected the charge mode will switch over from current to voltage regulation after top-off. The reference regulating voltage can be adjusted to the battery characteristic by external resistors connected to pin Vstb. This reference voltage has to be selected in such a way that it equals the rest voltage of the battery. By using voltage regulation, the battery will not be discharged at a load occurrence. If the Vstb input pin is floating, the TEA1103x will apply voltage regulation at 1.325 V during the standby mode (NiCd and NiMH). The current during voltage regulation is limited to 0.5CA. If the battery charge current is maximized to 0.5CA for more than 2 hours charging will be stopped. Moreover, if the temperature exceeds Tmax, charging will be stopped completely. As voltage regulation is referred to one cell, the voltage on the Vbat pin must be the battery voltage divided by the number of cells (NiCd and NiMH). When charging, the standby mode can only be entered after a certain period of time depending on time-out. To support full test of the TEA1103x at application, the standby mode is also entered when Vbat <Vbat(l) at top-off. I top off – R sense × R b 310 6 – × × = t top off – 2 27 TOD × t osc × = I trickle R sense × R b 15 16 ------ × 10 6 – × = Timer The timing of the circuit is controlled by the oscillator frequency. The timer block defines the maximum charging time by ‘time-out’. At a fixed oscillator frequency, the time-out time can be adapted by the Programmable Time-out Divider (PTD) using the following equation. (6) The time-out timer is put on hold by low voltage, temperature protection and during the inhibit mode. The Programmable Oscillator Divider (POD) enables the oscillator frequency to be increased without affecting the sampling time and time-out. Raising the oscillator frequency will reduce the size of the inductive components that are used. At fast charging, after battery insertion, after refresh or supply interruption, the full detector will be disabled for a period of time to allow a proper start with flat or inverse polarized batteries. This hold-off period is disabled at fast charging by raising pin Vstb to above ±5 V (once). So for test options it is possible to slip the hold-off period. The hold-off time is defined by the following equation: (7) Table 2 gives an overview of the settings of timing and discharge/charge currents. t time out – 2 26 POD × PTD × t osc × = t hold off – 2 5 – t time out – × = |
Número de pieza similar - TEA1103T |
|
Descripción similar - TEA1103T |
|
|
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 |