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TSM101P Datasheet(PDF) 9 Page - STMicroelectronics |
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TSM101P Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 15 page  Figure 5 : Precise Output Voltage Control 5.3. Higher Precision for the Voltage Control The voltage drop through the sense resistor R5 offsets the voltage measurement. In most battery charging applications, this offset is not taken into account because the error is negligeable com- pared to the end-of-charge voltage due to the fact that the charging current value decreases drasti- cally during the final phase of the battery charging. But in other applications needing highest possible precision in voltage control, another connecting schematic is possible for TSM101 as shown on figure 5. In this schematic, the 0V reference is defined as the common point between the sense resistor, the 0V Output Voltage, the foot of the resistor bridge R6/R7, and the ground (pin 4) of the TSM101. TSM101A(1% internal voltage reference precision) is required in such applications. 5.4. An example of application where the charging current is different according to the charging phase. The following application includes a specific recom- mendation which requires that the charging current should be fixed to Ich1 = 800mAin normal charging conditions, and Ich2 = 200mA when the cell volt- age is below Vl=2.5V to optimize the cell life-time. Moreover, an Charging Status LED should be switched off when the cell voltage is above Vh=6.5V. Figure 6 shows how this can easily be achieved using an additional dual comparator (type LM393) where the first operator (C1) is used to activate the TSM101 internal current generator to offset the current measurement thanks to R4, and the second (C2) is used to switch the status LED off. On figure 6, the status signal is determined by voltage meas- urement, this could as well be achieved by current measurement. If V5 = 100mV is the maximum tolerable voltage drop through the sense resistor R5 during normal TSM101/A 9/15 |
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