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AN4370 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN4370
Description  L99ASC03 PMBLDC sensorless 3-phase motor driver
PDF  23 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4370 Datasheet(HTML) 16 Page - STMicroelectronics

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PRE-DRIVE tests
AN4370
16/23
DocID025336 Rev 1
Figure 8. PRE-DRIVE test example: Phase 1 connected
Charge pump output voltage
The integrated two-stage charge pump is supplied from the VS pin. The curves in Figure 9
have been measured on one L99ASC03 unit at room temperature. Figure 9 can be used in
conjunction with the VCPLOW parameter in the datasheet to assess if the charge pump can
provide enough voltage to drive the external MOSFETs and if the L99ASC03 will set the
CPLOW flag (bit 7 in Status Register 1).
Figure 9. Difference between charge pump output voltage and input supply voltage vs. input
supply voltage VVS as a function of charge pump load (CCP1 =CCP2 =220 nF, CTANK =1µF)



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