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L9908 数据表(PDF) 55 Page - STMicroelectronics |
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L9908 数据表(HTML) 55 Page - STMicroelectronics |
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55 / 152 page  Symbol Parameter Test condition Min Typ Max Unit Notes CP2_iout2 Charge pump2 load current CP1_lin_mode_th < VBP ≤ 60 V CFLY2 = 1 μF SHS_n = VDH INHn = 1 - - 10 mA [n = 1,2,3] CP2_vout1 Charge pump2 output voltage at CBS_n-SHS-n 5.5 V ≤ VBP ≤ CP1_lin_mode_th CFLY2 = 1 μF SHS_n = VDH INHn = 1 8 - - V [n = 1,2,3] CP2_vout2 Charge pump2 output voltage at CBS_n-SHS-n CP1_lin_mode_th < VBP ≤ 60 V CFLY2 = 1 μF SHS_n = VDH INHn = 1 8 - - V [n = 1,2,3] CP2_freq Charge pump2 frequency - - 400 - kHz Not subject to production test BT_lim2_ilim BT charge limiter2 limitation current SHS_n = VDH INHn = 1 -8 - -1 mA [n = 1,2,3] BT_lim2_vlim BT charge limiter2 limitation voltage SHS_n = 0 BT1_DIS = 1 7 10 14 V [n = 1,2,3] CBT_boot_time_HB CBT boot time at high battery (VBP & VDH > 10 V) SHS_n = 0 CBT = 1 μF CBS_n 0 V to 7 V 0.25 - 0.5 ms [n=1,2,3] CBT_boot_time_LB CBT boot time at low battery (VBP & VDH < 10 V) SHS_n = 0 CBT = 1 μF CBS_n 0 V to 7 V 0.5 - 1 ms [n=1,2,3] Note: All parameters are guaranteed, and tested, in the voltage ranges reported above in Table 5 unless otherwise specified. Where not specified the parametrical operating range equals the functional operating range. Bootstrap capacitance and bootstrap limiter 1 (BT1) Bootstrap capacitance has the purpose of delivering the charge required for the external HS FET turn on translating its voltage level over VDH. These capacitances are charged from the C_VPRE through BT1n circuitries during the n-th half bridge (1- D)*Tpwm interval (where Tpwm is the PWM period and D is the half bridge duty cycle). BT1 develops this function by ensuring at the same time a current limitation to avoid in-rush current when CBS are depleted and an overvoltage protection during HS turn-on phases and related voltage swing. If bootstrap limiter 1 is disabled the charging path from VPRE is interrupted and bootstrap capacitors must be charged by other means, for example, from CP2. Bootstrap limiter 1 can be disabled by the dedicated SPI bit BT1_DIS within the register GEN_CFG3 as follows: Table 52. Bootstrap limiter 1 disable bit BT1_DIS Description 0 Bootstrap limiter 1 enabled (Default) 1 Bootstrap limiter 1 disabled L9908 Functional description DS13546 - Rev 5 page 55/152 |
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