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TPS40100RGET Datasheet(PDF) 9 Page - Texas Instruments |
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TPS40100RGET Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page www.ti.com f − Switching Frequency − kHz 100 300 100 150 200 250 350 300 350 200 450 550 400 250 500 150 fSW − Switching Frequency − kHz 250 100 50 350 300 400 500 450 600 550 125 75 225 175 200 150 Selecting an Inductor Value L + VIN * VOUT VOUT VIN fSW DI (H) (2) Selecting the Output Capacitance TPS40100 SLUS601–MAY 2005 APPLICATION INFORMATION (continued) TIMING RESISTOR TIMING RESISTOR vs vs SWITCHING FREQUENCY SWITCHING FREQUENCY (250 kHz to 600 kHz) (100 kHz to 350 kHz) Figure 1. Figure 2. The inductor value determines the ripple current in the output capacitors and has an effect on the achievable transient response. A large inductance decreases ripple current and output voltage ripple, but is physically larger than a smaller inductance at the same current rating and limits output current slew rate more that a smaller inductance would. A lower inductance increases ripple current and output voltage ripple, but is physically smaller than a larger inductance at the same current rating. For most applications, a good compromise is selecting an inductance value that gives a ripple current between 20% and 30% of the full load current of the converter. The required inductance for a given ripple current can be found from: where • L is the inductance value (H) • VIN is the input voltage to the converter (V) • VOUT is the output voltage of the converter (V) • fSW is the switching frequency chosen for the converter (Hz) •∆I is the peak-to-peak ripple current in the inductor (A) The required value for the output capacitance depends on the output ripple voltage requirements and the ripple current in the inductor, as well as any load transient specifications that may exist. The output voltage ripple depends directly on the ripple current and is affected by two parameters from the output capacitor: total capacitance and the capacitors equivalent series resistance (ESR). The output ripple voltage (worst case) can be found from: 9 |
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