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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9961 датащи(PDF) 52 Page - STMicroelectronics |
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L9961 датащи(HTML) 52 Page - STMicroelectronics |
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52 / 63 page  5.9.1 Safety bypass in HS configuration During normal operation, the µC shall drive high the NPN base, thus generating a proper Vgs to turning on the PMOS. In case of fault, the µC shall drive low the NPN base in order to ensure the PMOS turning off. Figure 24. Fail-safe switch in HS configuration GADG220620221415SA L9961 P- P+ VSD DCHG CHG VSC RDCHG RCHG MDCHG MCHG S G D From µC Fail-safe switch Disconnects CHG MOSFET driver R1 R2 MFS BSW V VB P- Table 41. BOM for Fail-safe switch in HS configuration Components Value Unit Max. tolerance Rating Comments MFS 40 V Smal signal P-Channel MOSFET used to interrupt the current flowing through CHG pin in case of fault during the charger fase. R1 1 MΩ 10% 1/10 W R2 330 kΩ 10% 1/10 W Bsw 40 V NPN fail-safe switch driven by MCU. In case of fault the µC drives low the BJT base in order to turns off the P-Channel MOSFET. L9961 Safety bypass DS14012 - Rev 1 page 52/63 |
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