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TPS40055 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS40055 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 35 page L + V IN * VO V O V IN DI f SW (Henries) 2 4 6 8 12 10 V IN – Input Voltage – V 2 1 5 4 6 3 110°C – 55°C 25°C 2 4 6 8 12 10 V IN – Input Voltage – V 2 0 8 6 10 4 110°C – 55°C 25°C 1 7 5 9 3 TPS40054 TPS40055 TPS40057 www.ti.com SLUS593H – DECEMBER 2003 – REVISED JULY 2012 BP5 AND BP10 INTERNAL VOLTAGE REGULATORS Start-up characteristics of the BP5 and BP10 regulators over different temperature ranges are shown in Figure 7 and Figure 8. Slight variations in the BP5 occurs dependent upon the switching frequency. Variation in the BP10 regulation characteristics is also based on the load presented by switching the external MOSFETs. INPUT VOLTAGE INPUT VOLTAGE vs vs BP5 VOLTAGE BP10 VOLTAGE Figure 7. Figure 8. SELECTING THE INDUCTOR VALUE The inductor value determines the magnitude of ripple current in the output capacitors as well as the load current at which the converter enters discontinuous mode. Too large an inductance results in lower ripple current but is physically larger for the same load current. Too small an inductance results in larger ripple currents and a greater number of (or more expensive output capacitors for) the same output ripple voltage requirement. A good compromise is to select the inductance value such that the converter doesn't enter discontinuous mode until the load approximated somewhere between 10% and 30% of the rated output. The inductance value is described in Equation 5. where • VO is the output voltage • ΔI is the peak-to-peak inductor current (5) Copyright © 2003–2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS40054 TPS40055 TPS40057 |
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