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TSM101AC Datasheet(PDF) 7 Page - STMicroelectronics |
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TSM101AC Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  TSM101/A 7/13 If pin 2 is connected to ground, the internal current source is enabled, the current measurement is off-setted by a voltage equal to : • Vr4 = Io x R4 with Io = 1.4mA This can be used to lower the charging current or eventually to stop the charge, if Vr4 > Vr5 In our example, the current offset is equal to 700 - 200mA = 500mA, representing a voltage offset Vr4 = 140mV across R4. The following values are used on the application board : • R5 = 4 *1.2Ω 0.5W in parallel • R4 = 100Ω • R2 = 1.2kΩ • R3 = 220Ω • R9 = short circuit • R1 = 10kΩ • C2 = 100nF • C5 = 100nF • C1 = output capacitor of the SMPS • C4 = 10µF 4 - SCHEMATIC DIAGRAM Figure 2 represents a schematic of the output cir- cuit of a “classical” SMPS using a TL431 for volt- age regulation. This circuit is modified to use theTSM101 and the final circuit is represented in figure 3. Figure 3 : SMPS Using the TSM101 5 - IMPROVEMENT 5.1. High frequency compensation Two R-C devices (R9 + C2 & R10 + C3) are used to stabilize the regulation at high frequencies. The calculation of these values is not easy and is a function of the transfer function of the SMPS. A guess value for the capacitors C2 and C3 is 100nF. 5.2. Power supply for TSM101 In applications requiring low voltage battery charge or when the charger is in current regulation mode, the output voltage can be too low to supply correctly the TSM101. The same problem occurs when the output is short-circuited. A solution to provide a quasi constant supply volt- age to the TSM101 is shown at figure 4 : an auxil- iary winding is added at the secondary side of the transformer. This winding is forward coupled to the primary winding, the voltage across it is directly propor- tional to the mains rectified voltage, even if the fly- back voltage is close to zero. As this auxiliary winding is a voltage source, it is necessary to add a resistor (R11) on the cathode of the rectifier (D3) to limit the current. A low cost regulator (Q2 and Zener diode D4) is used to power the TSM101. This is necessary with autoranging SMPS with wide input voltages, for example 90 to 240V without switching. In standard SMPS with voltage range from 200 to 240VAC or 100 to 130VAC, this regulator can be removed and replaced by the small power supply shown on figure 5 (Raux, Caux, D2). |
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