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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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SS6781BCSTR Arkusz danych(PDF) 15 Page - Silicon Standard Corp. |
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SS6781BCSTR Arkusz danych(HTML) 15 Page - Silicon Standard Corp. |
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15 / 20 page  01/31/2008 Rev.1.00 www.SiliconStandard.com 15 SS6781B Procedure (a) First, determine the temperature protection limits TH and TL. Then, substitute TH & TL into the following equation: ∆ ∆ V T 0.72 V 0. 29 V TH TL 0. 43 V TH TL TS BASE CC CC CC = − − = − (b) Determine the safety timer to obtain the value of ∆t BASE . .) (min Timer Safety .) (min 80 56(sec.) = (sec.) tBASE × ∆ (c) Determine the expected slope of ∆ ∆ T / t at which temperature rises y °C in x seconds and fast charge is subsequently cut off. ∆ ∆ T t y x = (d) Calculate the value of VADJ BASE BASE TS ADJ t ∆ t ∆ T ∆ T ∆ V ∆ V × × × = 30 Example (a) Let TH=50 °C, TL=0°C, VCC =5V. We have ∆ ∆ V T 0.43 5 50 0 0.043V/ C TS BASE = × − =° which means that VTS decreases 43mV as temperature rises 1 °C. (b) If safety timer is equal to 80 minutes, ∆tBASE is then 56 seconds. (c) If fast charge should be terminated when temperature rises 1 °C in 60 seconds, then 0.0166 60 1 = t T/ = ∆ ∆ (d) VADJ =30 x 0.043x 0.0166 x 56 = 1.2(V) If the temperature range is from 0 °C to 50°C, the voltage of VADJ under different setting conditions should be set as tabulated below. TABLE 6 ADJ pin Voltage (TL=0 °C, TH=50°C) ∆∆ T/ t S.T. 0.75 ( °C/min.) 1.0 ( °C/min.) 1.25 ( °C/min.) 40 min. (2C) 0.45 0.60 0.75 80 min. (1C) 0.90 1.20 1.50 120 min. (0.67C) 1.35 1.80 2.25 160 min. (0.5C) 1.80 2.40 3.01 200 min. (0.4C) 2.25 3.01 3.76 240 min. (0.33C) 2.70 3.61 A similar table for temperature range from 0 °C to 60 °C is as below. TABLE 7 ADJ Pin Voltage (TL=0 °C, TH=60°C) ∆ ∆ T / t S.T. 0.75 ( °C/min.) 1.0 ( °C/min.) 1.25 ( °C/min.) 40 min. (2C) 0.37 0.50 0.62 80 min. (1C) 0.75 1.00 1.25 120 min. (0.67C) 1.12 1.50 1.88 160 min. (0.5C) 1.50 2.00 2.50 200 min. (0.4C) 1.88 2.50 3.13 240 min. (0.33C) 2.25 3.01 3.76 VBT Range and Temperature Protection The acceptable voltage range of VBT pin and mode of temperature protection function is determined by the voltage of SEL3 pin, shown as the following: (a) SEL3 > VCC - 0.3V Acceptable VBT Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: Entering charge-suspending mode when temperature is either too low or too high, same as abnormal battery voltage. Latch for charge-suspending function is provided for high temperature protection, but not for low temperature protection. (b) VCC - 1.4V> SEL3 > V 2 cc + 0.4V Acceptable VBT Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: If temperature is too high, battery charging is regarded as completed. If temperature is too |
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