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TK73230 Datasheet(PDF) 11 Page - TOKO, Inc |
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TK73230 Datasheet(HTML) 11 Page - TOKO, Inc |
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11 / 16 page  January 1999 TOKO, Inc. Page 11 TK732xx 3) Plot P D1 against 25 °C 4) Connect P D1 to the point corresponding to the 150 °C with a straight line. 5) In design, take a vertical line from the maximum operating temperature (e.g., 75 °C) to the derating curve. 6) Read off the value of P D against the point at which the vertical line intersects the derating curve. This is taken as the maximum power dissipation, D PD. The maximum operating current is: I OUT = (DPD / (VIN(MAX) - VOUT) SOT-23L-8 POWER DISSIPATION CURVE VIN RIPK CONTROL GND GND VOUT DEFINITIONS AND TERMS (CONT.) 0 50 100 150 TA (°C) 0 450 750 150 300 600 MOUNTED AS SHOWN FREE AIR INPUT-OUTPUT CAPACITORS The output capacitor is necessary for stable operation. The regulator may oscillate if the output capacitor is too small or missing. The output capacitor size is determined by load, transient response and external transistor used. Evaluation in the circuit is recommended to ensure performance requirements are satisfied. A minimum of 4.7 µF is necessary for stability, with twice that value recommended. The minimum recommended input capacitor is 1 µF. Problems do not occur with larger values of capacitance. However, extremely low ESR may result in unstable operation. Thus, the use of large value ceramic capacitors is not recommended on the output. BOARD LAYOUT SOT-23L-8 BOARD LAYOUT APPLICATION INFORMATION |
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