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L99LD21 数据表(PDF) 17 Page - STMicroelectronics |
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L99LD21 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 73 page  DS11130 Rev 5 17/73 L99LD21 Boost controller 72 The buck converters activation depends on device status (see Section 4.1: Operating modes): • Active mode: in this case, bucks are immediately operative. Their status will depend on DINMAP register configuration (see Section 4.2.1); • Limp Home: – we have to distinguish two different cases: Boost Enabled with output voltage higher than 92.5% of final target value. In this case, buck converters are immediately operative according to DIN_MAP register configuration; Boost Disabled or Enabled with output voltage lower than 92.5 % of final target value. In this case, the buck converters are kept disabled for a specified time delay (tDELAY) independently from DINMAP status. Once this time elapses, bucks are operative according to DINMAP register configuration. On the other hand, when boost and bucks are active and a VS undervoltage fault event occurs, buck converters are immediately disabled while the boost is kept alive for tDELAY before being switched off. |
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