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TK70203MTL Datasheet(PDF) 5 Page - TOKO, Inc |
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TK70203MTL Datasheet(HTML) 5 Page - TOKO, Inc |
5 / 6 page January, 1996 TOKO, Inc. Page 5 TK702xx 1-16-96 APPLICATION NOTES RECOMMENDED MOUNTING Optimum performance can only be achieved when the IC is mounted on a PC board according to the diagram below. This is because of the extremely small package and limited power dissipation. Shape the metal portion of the PCB as shown in the following drawing. VO GND ON/ OFF or CP GND VIN T K70203•FIG1A Use a large bypass capacitor and connect it in a place near GND of the IC. Pay attention to temperature characteristics of the capacitor, especially the increase of ESR and de- crease of capacitance in low temperatures. Oscillation, reduction of ripple rejection and increased noise may occur in some cases if the proper capacitor is not used. An output capacitor more than 1.0 µF is required to maintain stability. The standard test condition is 3.3 µF (T A = 25 °C). DROPOUT VOLTAGE Dropout voltage is the voltage difference between the input voltage and the output voltage where the output voltage decreases to 100 mV below the nominal output voltage as the input voltage is decreased. To measure dropout voltage, set the input voltage to the nominal output voltage +1 V and measure the output voltage. Reduce the input voltage to the point where the output is 100 mV below the prevoiusly measured value. The dropout voltage is the difference between the input and ouput voltage at this point. This voltage depends on the load current and ambient temperature. |
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