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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L7986TA датащи(PDF) 11 Page - STMicroelectronics |
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L7986TA датащи(HTML) 11 Page - STMicroelectronics |
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11 / 43 page  L7986TA Functional description Doc ID 022098 Rev 3 11/43 5.2 Soft-start The soft-start is essential to assure correct and safe startup of the step-down converter. It avoids inrush current surge and makes the output voltage increase monothonically. The soft-start is performed by a staircase ramp on the non-inverting input (VREF) of the error amplifier. So the output voltage slew rate is: Equation 1 where SRVREF is the slew rate of the non-inverting input, while R1and R2 is the resistor divider to regulate the output voltage (see Figure 6). The soft-start staircase consists of 64 steps of 9.5 mV each, from 0 V to 0.6 V. The time base of one step is of 32 clock cycles. So the soft-start time and then the output voltage slew rate depend on the switching frequency. Figure 6. Soft-start scheme. Soft-start time results: Equation 2 For example, with a switching frequency of 250 kHz the SSTIME is 8 ms. SR OUT SR VREF 1 R1 R2 -------- + ⎝⎠ ⎛⎞ ⋅ = SS TIME 32 64 ⋅ Fsw -------------------- = |
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