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CSD97370Q5M Datasheet(PDF) 11 Page - Texas Instruments

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Part No. CSD97370Q5M
Description  Synchronous Buck NexFET Power Stage
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CSD97370Q5M Datasheet(HTML) 11 Page - Texas Instruments

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0
5
10
15
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25
30
35
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50
0
20
40
60
80
100
120
140
Board Temperature ( C)
°
1
2
3
CSD97370Q5M
www.ti.com
SLPS314A
– JUNE 2011 – REVISED JUNE 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
Typical Power Loss at 25A = 3.5W (Figure 7)
Normalized Power Loss for switching frequency
≈ 1.08 (Figure 12)
Normalized Power Loss for input voltage
≈ 1.05 (Figure 13)
Normalized Power Loss for output voltage
≈ 0.7 (Figure 14)
Normalized Power Loss for output inductor
≈ 1.04 (Figure 15)
Final calculated Power Loss = 3.5W
× 1.08 × 1.05 × 0.7 × 1.04 ≈ 2.89W
Calculating SOA Adjustments
SOA adjustment for switching frequency
≈ 2.6°C (Figure 12)
SOA adjustment for input voltage
≈ 1.4°C (Figure 13)
SOA adjustment for output voltage
≈ –1.0°C (Figure 14)
SOA adjustment for output inductor
≈ 1.3°C (Figure 15)
Final calculated SOA adjustment = 2.6 + 1.4 + (
–1.0) + 1.3 ≈ 4.3°C
Figure 19. Power Stage CSD97370Q5M SOA
In the design example above, the estimated power loss of the CSD97370Q5M would increase to 2.89W. In
addition, the maximum allowable board and/or ambient temperature would have to decrease by 4.3
°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 4.3
°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
© 2011, Texas Instruments Incorporated
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