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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 62 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 62 Page - Texas Instruments |
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62 / 104 page  3.55.7 SOFT START 3.55.8 DROPOUT OPERATION AT 100% DUTY CYCLE 3.55.9 OUTPUT VOLTAGE MONITORING 3.55.10 PHASE CONTROL IN PWM MODE 3.55.11 INTEGRATED SNUBBER AND CURRENT LIMIT TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com Figure 3-17. Voltage Positioning SM0, SM1 and SM2 have an internal soft start circuit that limits the inrush current during start-up. An initial delay (170s typ) from the converter enabled command to the converter effectively being operational is required to ensure that the internal circuits of the converter are properly biased. At the end of that initial delay the soft start is initiated and the internal compensation capacitor is charged with a low value current source. The soft start time is typically 250s, with the output voltage ramping from 5% to 95% of the final target value. The TPS658620 buck converters offer a low input to output voltage difference while still maintaining operation when the duty cycle is set to 100%. In this mode of operation the high-side FET is constantly turned on to enable operation with a low input voltage. The dropout operation will start if : V(VIN_SMx) ≤ V(SMx) + ILx × (RDSON(PSMx) + RL) where ILx is the output current plus 1/2 inductor ripple current and RL is the DC resistance of the inductor. The output voltage of converters SM0, SM1 and SM2 is monitored by internal comparators, and an output low voltage condition is detected when the output voltage is below 90% of the programmed value. The power good comparator is disabled for all converters during output voltage transitions. The power comparator on SM2 power good is also disabled when battery tracking mode is set. By default the SM0, SM1 and SM2 converters operate with phased clocking when they are in PWM mode, with converter SM0 as the master. Converters SM0 and SM1, when enabled, will run 90 and 180 degrees out of phase with SM0. The SM2 converter has an integrated electronic snubber that is used to improve transient response when operating under conditions which cause the inductor current to flow in the negative direction (into the Ln node) . This is especially true when SM2 is configured as the pre-regulator stage to the charger. DETAILED DESCRIPTION 62 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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