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L6730 数据表(PDF) 29 Page - STMicroelectronics |
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L6730 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 52 page  L6730 - L6730B Device description 29/52 5.13 Minimum ON-time TON(MIN) The device can manage minimum ON times lower than 100ns. This feature comes from the control topology as well as from the particular L6730/B overcurrent protection system. In a voltage mode controller, the current does not have to be sensed to perform regulation and, in the case of L6730/B, it does not have to be sensed for the overcurrent protection either because valley current protection can operate during the OFF time. The first advantage related of this feature is the achievement of extremely low conversion ratios. Figure 24. shows a conversion from 14V to 0.5V at 820kHz with a tON of about 50ns. The ON time is limited by the MOSFET turn-on and turn-off times. Figure 24. 14V -> 0.5V@820KHz, 5A 50ns |
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