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GRM188R71C104KA01 Datasheet(PDF) 10 Page - ams AG |
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GRM188R71C104KA01 Datasheet(HTML) 10 Page - ams AG |
10 / 20 page www.austriamicrosystems.com/DC-DC_Step-Up/AS1310 Revision 1.8 9 - 19 AS1310 Datasheet - Detailed Descri pti on Figure 13. Simplified Voltage and Current Waveforms Another important relationship is the “volt-seconds” law. Expressed as following: (EQ 4) Voltages are those measured across the inductor during each time segment. Figure 13 shows this graphically with the shaded segments marked “A & B”. Re-arranging (EQ 4): (EQ 5) The time segment called TWAIT in Figure 13 is a measure of the “hold-up” time of the output capacitor. While the output voltage is above the threshold (0.99xVOUT), the output is assumed to be in regulation and no further switching occurs. 8.1.2 Inductor Choice Example For the AS1310 VIN_MIN = 0.9V, VOUT_MAX = 3.3V, (EQ 5) gives Ton=2.66TOFF. Let the maximum operating on-time = 1µs. Note that this is shorter than the minimum limit on-time of 3.6µs. Therefore from (EQ 5), TOFF = 0.376µs. Using (EQ 3), LMAX is obtained: LMAX = 1.875µH. The nearest preferred value is 2.2µH. This value provides the maximum energy storage for the chosen fixed on-time limit at the minimum VIN. IPK T T VOUT VIN 0 0 TWAIT TOFF TON TWAIT TOFF SW1_on SW2_off SW1_off SW2_on V IL VIND_TON VIND_TOFF T C BB A T C D D VOUT Ripple 0.99VOUT_NOM VONTON VOFFTOFF = TON TOFF ------------- VOUT VIN – VIN ---------------------------- = |
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