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STSPIN32F0251 Datasheet(PDF) 19 Page - STMicroelectronics |
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STSPIN32F0251 Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 32 page  Equation 1 (1) t1≅RON_OD ∙COD∙ln VODVSSDl Equation 2 (2) t2≅COD∙ VSSDh IOD ∙ln VSSDl−VOD VSSDh−VOD Where VOD = VFLOAT_OD In case the OD pin is connected to VCC by an external pull-up resistor ROD_ext, the OD discharge time is determined by the external network ROD_ext COD and by the internal MOSFET's RON_OD (Equation 3), while the Restart time is determined by current in ROD_ext (Equation 4) Equation 3 (3) t1≅COD∙ ROD_ext//RON_OD ∙ln VOD−Von VSSDl−Von Equation 4 (4) t2≅COD∙ ROD_ext ∙ln VSSDl−VOD VSSDh−VOD where Von= RON_OD ROD_ext+RON_OD ∙Vcc ; VOD=Vcc Figure 10. Smart shutdown timing waveforms SMART SHUTDOWN CIRCUIT LVG/HVG OD gate (internal) CIN Fast shut down the driver outputs are switched off disable time OD FAULT VREF tFCIN tFCIN tCINoff VSSDh VSSDl VOD t1 t2 OD COD SMART SD LOGIC RON_OD IOD 5 V VCC OD COD SMART SD LOGIC RON_OD IOD 5 V ROD_ext external pull-up 2 1 immediately after the comparator triggering STSPIN32F0251, STSPIN32F0252 Gate driver DS13048 - Rev 4 page 19/32 |
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