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LM2731XMFX/NOPB Datasheet(PDF) 17 Page - Texas Instruments |
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LM2731XMFX/NOPB Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 29 page ![]() 2 3 4 5 6 7 8 VIN (V) 0 200 400 600 800 1000 1200 V OUT = 5V V OUT = 8V V OUT = 10V V OUT = 12V VIN (V) 0 200 400 600 800 1000 1200 2 3 4 5 6 7 8 9 10 11 V OUT = 5V V OUT = 8V V OUT = 10V V OUT = 12V V OUT = 18V LM2731 www.ti.com SNVS217G – MAY 2004 – REVISED SEPTEMBER 2015 Figure 31. Maximum Load Current (Typical) vs VIN - Y Figure 30. Maximum Load Current (Typical) vs VIN - X Option Option 8.2.2.12 Design Parameters VSW and ISW The value of the FET "ON" voltage (referred to as VSW in the equations) is dependent on load current. A good approximation can be obtained by multiplying the "ON-Resistance" of the FET times the average inductor current. FET on resistance increases at VIN values less than 5 V, since the internal N-FET has less gate voltage in this input voltage range (see Typical Characteristics curves). Above VIN = 5V, the FET gate voltage is internally clamped to 5V. The maximum peak switch current the device can deliver is dependent on duty cycle. For higher duty cycles, see Typical Characteristics. 8.2.2.13 Inductor Suppliers Recommended suppliers of inductors for this product include, but are not limited to Sumida, Coilcraft, Panasonic, TDK, and Murata. When selecting an inductor, make certain that the continuous current rating is high enough to avoid saturation at peak currents. A suitable core type must be used to minimize core (switching) losses, and wire power losses must be considered when selecting the current rating. Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: LM2731 |
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