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TEA1103T Folha de dados(PDF) 6 Page - NXP Semiconductors |
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TEA1103T Folha de dados(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  1999 Jan 27 6 Philips Semiconductors Preliminary specification Fast charge ICs for NiCd and NiMH batteries TEA1103; TEA1103T; TEA1103TS INTRODUCTION All battery types are initially fast charged with an adjustable high current. Fast charge termination depends upon the battery type. With NiCd and NiMH batteries the main fast charge termination will be the ∆T/∆t (temperature detection) and/or peak voltage detection. The fast charge period is followed by a top-off period for NiCd and NiMH batteries. During the top-off period the NiCd and NiMH batteries are charged to maximum capacity by reduced adjustable charge current. The top-off period ends after time-out or one hour respectively. After the top-off period, the TEA1103x switches over to the standby mode. For NiCd and NiMH batteries either the voltage regulation or trickle charge mode can be selected. The voltage regulation mode is selected when the battery includes a fixed load. Trickle charge prevents a discharge of the battery over a long period of time. Charging principles CHARGING NiCd/NiMH BATTERIES Fast charging of the battery begins when the power supply voltage is applied and at battery insertion. During fast charge of NiCd and NiMH batteries, the battery temperature and voltage are monitored. Outside the initialized temperature and voltage window, the system switches over to the top-off charge current. The TEA1103x supports detection of fully charged NiCd and NiMH batteries by either of the following criteria: •∆T/∆t • Voltage peak detection. If the system is programmed with ∆T/∆t and Vpeak or, ∆T/∆t or Vpeak as the main fast charge termination, it automatically switches to voltage peak detection if the battery pack is not provided with a temperature sensing input (NTC). In this way both packages, with and without temperature sensor, can be used randomly independent of the applied full detection method. Besides ∆T/∆t and/or voltage peak detection, fast charging is also protected by temperature cut-off and time-out. To avoid false fast charge termination by peak voltage detection or ∆T/∆t, full detection is disabled during a short hold-off period at the start of a fast charge session. After fast charge termination, the battery is extra charged by a top-off period. During this period of approximately one hour, the charge current is lowered thus allowing the battery to be charged to nearly 100% before the system switches over to standby. After the battery has been charged to nearly 100% by the top-off period, discharge of the battery (caused by a load or by the self-discharge) can be avoided by voltage regulation or by trickle charge. If batteries are charged in combination with a load, the TEA1103x can be programmed to apply voltage regulation during the standby mode. In this way, discharge of the battery caused by self-discharge or by an eventual load is avoided. The regulating voltage is adjustable to the voltage characteristic of the battery. For battery safety the charge current is limited and the temperature is monitored during voltage regulation. If a trickle charge is applied, the self-discharge of the battery will be compensated by a pulsating charge current. To avoid the so called ‘memory effect’ in NiCd batteries, a refresh can be manually activated. The discharge current is regulated by the IC in combination with an external power transistor. After discharging the battery to 1 V per cell, the system automatically switches over to fast charge. FUNCTIONAL DESCRIPTION Control logic The main function of the control logic is to support the communication between several blocks. It also controls the charge method, initialization and battery full detection. The block diagram of the TEA1103x is illustrated in Fig.1. Conditioning charge method and initializations At system switch-on, or at battery insertion, the control logic sets the initialization mode in the timer block. After the initialization time the timer program pins can be used to indicate the charging state using several LEDs. The charge method is defined at the same time by the following methods: • If the FCT pin is floating, the system will charge the battery according to the charge characteristic of NiCd and NiMH batteries. • The standby charge method (NiCd and NiMH), trickle charge or voltage regulation, is defined by the input pin Vstb. By biasing this voltage with a set voltage, the output voltage will be regulated to the Vstb set voltage. If this pin is connected to VS, or no NTC is connected the system applies trickle charge. |
Nº de peça semelhante - TEA1103T |
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Descrição semelhante - TEA1103T |
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