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CSD96370Q5M Datasheet(PDF) 11 Page - Texas Instruments |
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CSD96370Q5M Datasheet(HTML) 11 Page - Texas Instruments |
11 / 19 page Board Temperature (°C) 0 20 40 60 80 100 120 140 0 5 10 15 20 25 30 35 40 45 50 G028 V = 5V DD V = 12V IN V = 1.2V OUT f = 500kHz SW L = 0.3 µH OUT 1 2 3 CSD96370Q5M www.ti.com SLPS265C – NOVEMBER 2010 – REVISED OCTOBER 2011 Calculating Power Loss and SOA The user can estimate product loss and SOA boundaries by arithmetic means (see the Design Example). Though the Power Loss and SOA curves in this datasheet are taken for a specific set of test conditions, the following procedure will outline the steps engineers should take to predict product performance for any set of system conditions. Design Example Operating Conditions: Output Current (lOUT) = 25A, Input Voltage (VIN ) = 7V, Output Voltage (VOUT) = 1V, Switching Frequency (fSW) = 800kHz, Output Inductor (LOUT) = 0.2µH Calculating Power Loss • Power Loss at 25A = 3.3W (Figure 7) • Normalized Power Loss for switching frequency ≈ 1.09 (Figure 12) • Normalized Power Loss for input voltage ≈ 1.07 (Figure 13) • Normalized Power Loss for output voltage ≈ 0.95 (Figure 14) • Normalized Power Loss for output inductor ≈ 1.06 (Figure 15) • Final calculated Power Loss = 3.3W × 1.09 × 1.07 × 0.95 × 1.06 ≈ 3.88W Calculating SOA Adjustments • SOA adjustment for switching frequency ≈ 2.7°C (Figure 12) • SOA adjustment for input voltage ≈ 0.1°C (Figure 13) • SOA adjustment for output voltage ≈ –1.3°C (Figure 14) • SOA adjustment for output inductor ≈ 1.6°C (Figure 15) • Final calculated SOA adjustment = 2.7 + 0.1 + ( –1.3) + 1.6 ≈ 3.1°C Figure 19. Power Stage CSD96370Q5M SOA In the design example above, the estimated power loss of the CSD96370Q5M would increase to 3.88W. In addition, the maximum allowable board and/or ambient temperature would have to decrease by 3.1 °C. Figure 19 graphically shows how the SOA curve would be adjusted accordingly. 1. Start by drawing a horizontal line from the application current to the SOA curve. 2. Draw a vertical line from the SOA curve intercept down to the board/ambient temperature. 3. Adjust the SOA board/ambient temperature by subtracting the temperature adjustment value. In the design example, the SOA temperature adjustment yields a reduction in allowable board/ambient temperature of 3.1 °C. In the event the adjustment value is a negative number, subtracting the negative number would yield an increase in allowable board/ambient temperature. Copyright © 2010–2011, Texas Instruments Incorporated 11 |
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