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STPM098C 数据表(PDF) 68 Page - STMicroelectronics |
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STPM098C 数据表(HTML) 68 Page - STMicroelectronics |
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68 / 110 page  Figure 56. Current sum overcurrent timing diagram t PWMm IOUTm_OC_SUM Calculation IOUTm_OC_SUM Comparator IOUTn_OC_SUM_TH Average ISUMn 0x00 0x00 0 PWM1 TI_isum_calculation Data Available ≤100us OC OC OC IOUTm_OC_SUM Retry Counter 0x01 0x02 0x03 HIZ HIZ OC OC 0x04 Table 54. IOUT sum overcurrent monitor electrical characteristics Symbol Parameter Test condition Min Typ Max Unit Notes IOUT_MON_OC_SUM_th_retry_lsb IOUT OC SUM monitoring threshold step(1) - 0.293 - A Application information IOUT_MON_OC_SUM_th_range IOUT OC SUM monitoring threshold range 0 - 239.7 A Application information T_iout_umb_detect_dly IOUT OC SUM monitoring detection delay CLK_SSM_EN = 0 - 65 100 μs Application information 1. IOUTn_oc_sum_th<7:0> LSB: is 0.9376 A considering DrMOS current gain 5 mV/A, it corresponds to 16 READ_IOUTm LSB (0.293 mV * 16 = 4.688 mV, using 5 mV/A DrMOS current gain becomes 0.9376 A). 3.13 Feedback disconnection monitor (FDM) STPM098C implements a dedicated diagnosis at both voltage sensing terminals (VSENn, VRTNn) of each control loop to detect feedback disconnection events before regulation startup. The FDM diagnosis unit is composed by a force stage and a monitor stage. The force stage has the purpose of weakly pulling up the voltage of VSENn and VRTNn terminals up to VCC. If VSENn ≥ VFB_DISC_TH occurs for an interval longer than T_vfb_disc_flt after a T_vfb_dics_blank, FB_DISC flag is set and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising edge on VRn_EN [n = 1, 2] is detected. If VRTNn ≥ VFB_DISC_TH occurs for an interval longer than T_vfb_disc_flt after a T_vfb_dics_blank, FB_DISC_RTN flag is set and SAFE_HIZ is established. The error flag remains set until the failure condition is removed and a rising edge on VRn_EN [n = 1, 2] is detected. The FDM is safety relevant and then a self-check procedure is implemented. STPM098C Functional description DS14440 - Rev 1 page 68/110 |
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