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L9678P 数据表(PDF) 29 Page - STMicroelectronics |
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L9678P 数据表(HTML) 29 Page - STMicroelectronics |
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29 / 203 page  DocID029274 Rev 3 29/203 L9678P, L9678P-S Start-up power control 202 Normal run time power for the system is provided directly from the battery input, not from the boost. Boost energy is available to the system through the energy reserve crossover switch once battery is lost or a commanded system shutdown is initiated. By default, the ERBoost regulator is switched off once enetered in passive mode. To keep active the ERBoost also in passive mode the SPI bit SYS_CFG(KEEP_ERBST_ON) must be set to 1. Figure 11. ERBOOST control behaviour 4.3.2 Energy reserve capacitor charging circuit The energy reserve capacitor connected to VER pin can be charged in an efficient way by means of a current generator. Its capability is 30 mA nominal, so that for example a 2.2 mF capacitor can be charged in approximately 2 s to 24 V. The current generator is activated or deactivated by SPI command only while in ACTIVE mode. When not in ACTIVE mode, the generator is always switched off in order to decouple ERBOOST node voltage from VER reserve voltage. Figure 12. ER cap charging circuit |
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