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L6713ATR 数据表(PDF) 45 Page - STMicroelectronics |
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L6713ATR 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 64 page ![]() L6713A Soft-start 45/64 Figure 19. Soft-start time for Intel mode when using RSSOSC versus SGND 16.2 AMD mode Once L6713A receives all the correct supplies and enables, and AMD mode has been selected, it initiates the soft-start by stepping the reference from zero up to the programmed VID code (See Figure 15); the clock now used to step the reference is the same as the main oscillator programmed by the OSC pin, SSOSC pin is not applicable in this case. The soft- start time results then (See Figure 20): where TSS is the time spent to reach VSS and FSW is the main switching frequency programmed by OSC pin. Protections are active during soft-start, UVP is enabled after the reference reaches 0.6 V while OVP is always active with the fixed 1.800 V threshold (or the programmed VOVP). Figure 20. Soft-start time for AMD mode 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 1 10 100 1000 Rssosc [kOhms] vs. SGND Time to Vboot Time to 1.6000V dV OUT dT ------------------ 3.125 F SW kkHz [] ⋅ = T SS V SS 3.125 F SW kHz [] ⋅ ----------------------------------------------- = ⇒ 0 0.5 1 1.5 2 2.5 3 3.5 4 0 200 400 600 800 1000 Rosc [kOhms] to SGND 150 200 250 300 350 400 450 500 550 Time to 1.6000V Time to 1.1000V Switching Frequency per phase 0 0.5 1 1.5 2 2.5 3 3.5 4 0 200 400 600 800 1000 Rosc [kOhms] to SGND 150 200 250 300 350 400 450 500 550 Time to 1.6000V Time to 1.1000V Switching Frequency per phase |
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