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TSM101AC Datasheet(PDF) 6 Page - STMicroelectronics |
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TSM101AC Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 13 page TSM101/A 6/13 Figure 2 : SMPS Using a TL431 as Voltage Controller The optocoupler current increases and tends to reduce the output voltage by the way of the PWM controller. By enabling the TSM101 current source (pin 2) it is possible to offset the current sensing by a volt- age equal to : Voff # R4 * Io with Io = 1.4mA This offset lowers the output charge current and this function can be used to charge two types of batteries having different capacities. The current source is enabled by connecting pin 2 to ground 3 - CALCULATION OF THE ELEMENTS The charge current is regulated at 700mA (if the charge control input is left open) or 200mA (if the charge control input is put to ground ), allowing the charge of two different types of batteries. 3.1 - Voltage limitation The end-of- charge voltage is limited at 1.45V/cell, this is the recommended voltage for an ambient temperature at 25oC. A diode is generally inserted at the output of the charger to avoid the discharge of the battery if the charger is not powered. This diode is sometimes directly integrated in the battery pack. The influ- ence of this diode on the charge is negligible if the voltage drop (0.7V) is taken into account during the design of the charger. The voltage at the output of the charger is : • V out = and regarding R6 and R7 : • R6= P1, which is a part of R6 and R7 is not considered in this equation. The following values are used on the application board : • R7 = 12kΩ • R6 = 1kΩ • P1 = 220Ω, adjust for V output = 15.2V with the battery replaced by a 1k Ω resistor • R10 = short circuit • C3 = 100nF 3.2 - Current regulation R5 is the sense resistor used for current measure- ment. The current regulation is effective when the volt- age drop across R5 is equal to the voltage on pin 5 of the TSM101 (assuming that the internal cur- rent source is disabled). For medium currents (<1A), a voltage drop across R5 of 200mV = Vr5 is a good value, R5 can be re- alized with standard low cost 0.5W resistors in parallel. • R5 = , R5 = 0.285 Ω (four 1.2Ω resistor in parallel) R2 and R3 can be chosen using the following for- mula : • R2 = CHARGE CONTROL If the pin 2 is left open, the charge current is nom- inal at # 700mA. R6 R 7 + R6 ---------------------- V r × Vref Vout Vref – -------------------------------- R7 × Vr5 Ich ---------- R3 Vref Vr5 – Vr5 ---------------------------- × |
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