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L9963E 数据表(PDF) 146 Page - STMicroelectronics |
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L9963E 数据表(HTML) 146 Page - STMicroelectronics |
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146 / 184 page  Components Value Unit Max. tolerance Rating Comments The USBLC6-2SC6Y is the recommended ESD clamp device. It also protects the circuitry from spikes caused by a sudden short to battery on the global ISO lines. Care must be taken while routing the component on the PCB in order to minimize inductive spikes upon ESD strikes. Refer to the AN2689 - Protection of automotive electronics from electrical hazards, guidelines for design and component selection, section 5 – PCB layout recommendations. TRANSF 3.75 kV The ESMIT-4180/A is recommended for isolated communication interface 6.8.2 Capacitive-based insulation The capacitive-based insulation is recommended for local communication lines between different L9963E in a centralized BMS. It helps reducing the bill of material, while still guaranteeing common mode filtering between stacked devices. As shown in Centralized BMS, it is recommended to implement the isolation between HV and LV domains using a transformer, for better EMC performances. Figure 42. Capacitive based ISO lines circuit RTERM RTERM CCM_FIL CFIL CFIL BMIC ISOPINT ISOMINT ISO AFE DTVS DTVS RTERM RTERM CCM_FIL CFIL CFIL BMIC ISOPINT ISOMINT DTVS DTVS Table 82. Capacitive-based ISO lines BOM Components Value Unit Max. tolerance Rating Comments RTERM 59 Ω 10% 1/16 W Termination resistance. Differential output signal amplitude can be calculated with the following equation: VISODIFF=VCOM RTERM RDIFF_ISO_OUT CCM_FIL 6.8 nF 10% 10 V Filter common mode noise in the kHz range (inverter and other power converters). Pole introduced is fcut_kℎz= 1 πCCM_KHZ RISODIFF2+RTERM+7.2kΩ . Do not exceed 10 nF, otherwise common mode settling time upon ISO port enable will last too long. Connect to AGND. CISO 47 nF 10% 100 V Filters the common mode, while letting the differential mode pass. It acts as a high-pass filter with a cutoff frequency of fcut= 1 2π RDIFF_ISO_OUT 2 RTERMO +RTERMCISOP CFIL 22 pF 10% 16 V Noise filtering capacitor DTVS SZESD8351P2T5G or PESD5V0V1. TVS for withstanding hotplug L9963E ISO lines circuit DS13636 - Rev 12 page 146/184 |
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