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TSM102AIN Datasheet(PDF) 6 Page - STMicroelectronics |
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TSM102AIN Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 10 page  APPLICATION NOTE by R. LIOU A Li-Ion BATTERY CHARGER USING TSM102A This application note explains how to use the TSM102 in an SMPS-type battery charger which features : . Voltage Control . Current Control . Low Battery Detection and End Of Charge Detection 1 - TSM102 PRESENTATION The TSM102 integrated circuit includes two Opera- tional Amplifiers, two Comparators and one adjust- able precision Voltage Reference (2.5V to 36V, 0.4% or 1%). TSM102 can sustain up to 36V power supply volt- age. 1 2 3 14 15 16 5 6 7 12 11 10 V CC + Vref Ca tho de V CC - COMP COMP TS M102 Figure 1 : TSM102 Pinout 2 - APPLICATION CONTEXT AND PRINCIPLE OF OPERATION In the battery charging field which requires ever increasing performances in more and more re- duced space, the TSM102A provides an attractive solution in terms of PCB area saving, precision and versatility. Figure 2 shows the secondary side of a battery charger (SMPS type) where TSM102A is used in optimised conditions : the two Operational Amplifi- ers perform current and voltage control, the two Comparators provide ”End of Charge” and ”Low Battery” signals and the Voltage Reference en- sures precise reference for all measurements. The TSM102A is supplied by an auxiliary power supply (forward configuration - D7) regulated by a bipolar transistor and a zener diode on its base (Q2 and DZ), and smoothed by the capacitors C3 and C4. R15 polarizes the base of the transistor and at the same time limits the current through the zener diode during regulation mode of the auxiliary power supply. The current and voltage regulations are made thanks to the two Operational Amplifiers. The first amplifier senses the current flow through the sense resistor Rs and compares it with a part of the reference voltage (resistor bridge R7, R8, R9). The second amplifier compares the reference voltage with a part of the charger’s output (resistor bridge R1, R2, R3). When either of these two operational amplifiers tends to lower its ouput, this linear information is propagated towards the primary side via two ORing diodes (D1, D2) and an optocoupler (D3). The compensation loops of these regulation functions are ensured by the capacitors C1 and C2. TSM102 6/10 |
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