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TEA1104T Datasheet(PDF) 10 Page - NXP Semiconductors |
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TEA1104T Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 16 page  1996 Feb 26 10 Philips Semiconductors Objective specification Cost effective battery monitor and fast charge IC for NiCd and NiMH chargers TEA1104; TEA1104T APPLICATION INFORMATION A guideline for the settings of TEA1104 and its external components selection is given based on an example of a 1 hour charger for a 4 cell NiCd or NiMH battery pack. The basic application diagram as illustrated in Fig.6 which is based on the application diagram illustrated in Fig.7 with some additional components; a 2 LED charge status indication has been provided. For charging a battery within one hour the charge current rating should be as follows: Required minimum charge current = battery capacity × 1.2/charge time. Therefore, for a 1 Ah battery the external charge current supply has to deliver at least 1.2 A. TEA1104 settings The fast charge back-up timer period, time-out, has to be set in relation to the expected maximum charge time. Normally, a safety back-up time is chosen approximately 25% longer than the maximum expected fast charge time. For a one hour charger the time-out period can be set to 1.25 h. Time-out relationship with the oscillator repetition time is as follows; tosc = time-out (h) × 3600/2 exp28 tosc =17µs for time-out = 1.25 h tosc is set with the combination of Cosc and Rref; where tosc = 0.93 × Rref × Cosc. Rref can be chosen between 13 and 120 kΩ, but a 27 kΩ resistor is recommended. The oscillator capacitor can be calculated which is 668 pF; the nearest higher practical value is 680 pF. In the trickle charge mode the LED output will pulsate with a repetition time; ttrickle = 2 exp14 × tosc = 0.28 s. The duty factor of the pulse is 2.5% of ttrickle. This duty factor also applies to the charge current as the charge current switch is driven by the LED output. Therefore, the average trickle charge current is Ifast /40. The Vbat input can be adapted to the battery voltage via the resistor dividers R1 and R2. When an NTC thermistor has been incorporated into the battery, the minimum, maximum and cut-off temperature levels can be set with the resistors R3 and R4. For an NTC with a common sensitivity of 3965 and adjustment resistor values R3 = 13 k Ω, R4 = 20 kΩ the minimum, maximum and cut-off temperatures will be 5, 42 and 50 °C respectively. The flow chart of the TEA1104; TEA1104A is given in Fig.5. The load state of the batteries can be displayed by one or two LEDs. The flow chart is not to be regarded as sequential. Each mode of operation is a purely separate continuous process. Table 1 Dual LED indication CHARGER MODE VLED VS LED 1 LED 2 Fast charging low high on off Fast charging protection low/high high on/off off Full (trickle charging) low/high low off on Battery open high high off off |
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