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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT8331 датащи(PDF) 11 Page - Analog Devices |
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LT8331 датащи(HTML) 11 Page - Analog Devices |
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11 / 34 page  LT8357 11 Rev. 0 For more information www.analog.com OPERATION When VOUT is very low during start-up or a short-circuit fault on the output, the switching regulator must operate at low duty cycle to maintain the power switch current within the current limit range, since the inductor current decay rate is very low during switch off time. The mini- mum on-time limitation may prevent the switcher from attaining a sufficiently low duty cycle at the programmed switching frequency. Therefore, the switch current will keep increasing through each switch cycle, exceed- ing the programmed current limit. To prevent the peak switch current from exceeding the programmed limit, the LT8357 implements a frequency foldback function, which starts to fold back the switching frequency as the FB voltage drops below 75% of its regulation voltage (see the Normalized Oscillator Frequency vs FB Voltage in the Typical Performance Characteristics section). The frequency foldback function prevents the inductor cur- rent from exceeding the programmed limit because of the minimum on-time. Once the frequency is folded back, external clock synchronization, Burst Mode operation and spread spectrum frequency modulation are all disabled to prevent interference to the frequency foldback operation. |
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