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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TEA1102T Datenblatt(PDF) 9 Page - NXP Semiconductors |
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TEA1102T Datenblatt(HTML) 9 Page - NXP Semiconductors |
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9 / 28 page  1999 Jan 27 9 Philips Semiconductors Preliminary specification Fast charge ICs for NiCd, NiMH, SLA and LiIon TEA1102; TEA1102T; TEA1102TS To ensure an eventual load during all charging states, the fast charge mode will be entered again if the battery voltage drops below 15 V for SLA or 3 V for Lilon. When charging, the standby mode (LiIon and SLA) can only be entered after a certain period of time depending on time-out. The same applies for charging NiCd or NiMH batteries. To support full test of the TEA1102x at application, the standby mode is also entered when Vbat <Vbat(l) at fill-up or top-off respectively. 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) t time out – 2 26 POD × PTD × t osc × = 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 hold off – 2 5 – t time out – × = Table 2 Timing and current formulae SYMBOL DESCRIPTION FORMULAE tosc timing see Fig.3 Tsampling (∆T/∆t) NTC voltage sampling frequency 217 × POD × PSD × tosc Tsampling (Vpeak) battery voltage sampling frequency 216 × POD × tosc ttop-off 227 × POD × tosc ttime-out 226 × POD × PTD × t osc thold-off 2−5 × ttime-out tLED inhibit or protection 214 × POD × tosc tsense 210 × POD × tosc tswitch 221 × POD × PTD × t osc Ifast charge/discharge currents Itop-off Itrickle Iload-max IRFSH R b R sense ----------------- V ref R ref ---------- × R b R sense ----------------- 3 × 10 6 – × R b R sense ----------------- 15 16 ------ × 10 6 – × R b R sense ----------------- 40 × 10 6 – × 100 mV R sense -------------------- |
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