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L9678P 数据表(PDF) 36 Page - STMicroelectronics |
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L9678P 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 215 page  Start-up power control L9678P, L9678P-S 36/216 DS11626 Rev 9 4.3.6 VSUP linear regulator (optional) The VSUP linear regulator can be used to provide 7 V derived directly from battery line with an external power transistor. This voltage rail can be used mainly to supply PSI-5 remote sensor interface. The stability of the regulation loop is guaranteed by the use of a small external capacitor. Current limitation is provided by means of controlling output current on BVSUP pin. The external pass transistor gives the flexibility to easily address different current loads. The VSUP regulator is enabled in the ACTIVE mode and continues operation in the PASSIVE mode using power from energy reserve. In the case of L9678P (no remote sensor interfaces), VSUP can be externally connected to ground. Figure 16. VSUP control behavior 4.3.7 VSF linear regulator The fully integrated VSF linear regulator provides a 20V voltage nominal (configurable to 25V via SPI command) derived directly from ERBOOST. This voltage rail is used in case an external n-ch safing FET has to be used. The stability of the regulation loop is guaranteed by the use of a small external capacitor. Current limitation is implemented. A minimum drop- out of 2V between ERBOOST and VSF is needed. VSF is enabled by the assertion of any ARMxINT signal, or by the assertion of (FENH and not (FENL)), as shown in Figure 17 GAPGPS01639 VSUP rampup Start T1 3ms VSUP_UV masking VSUP OFF (ACTIVE_MODE OR PASSIVE_MODE) AND SYS_CTL(VSUP_EN) = 1 VSUP_ON VSUP SHUTDOWN Start T2 5ms VSUP_UV = 1 T2 timeout (VSUP_UV=1 AND T1 timeout) VSUP_UV = 0 AND T1 timeout VSUP power mode control POWER -OFF_MODE OR SLEEP_MODE Default SYS_CTL(VSUP_EN) = 0 at POR=1 SYS_CTL(VSUP_EN) = 0 |
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