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TK11690U Datasheet(PDF) 11 Page - TOKO, Inc |
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TK11690U Datasheet(HTML) 11 Page - TOKO, Inc |
11 / 14 page January 1999 TOKO, Inc. Page 11 TK116xxU PD Dpd 25 50 75 150 (mW) TA (°C) 3 6 5 4 0 50 100 150 TA (°C) 0 600 1000 200 400 800 MOUNTED AS SHOWN FREE AIR DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.) SOT-89 POWER DISSIPATION CURVE thermal equilibrium is reached. The range of usable currents can also be found from the graph below: Procedure: 1) Find P D 2) P D1 is taken to be PD x (~ 0.8 - 0.9) 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 The maximum operating current is: I OUT = (DPD / (VIN(MAX) - VOUT) |
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