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PM6644 数据表(PDF) 13 Page - STMicroelectronics |
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PM6644 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 35 page  PM6644 Simplified application schematic Doc ID 023203 Rev 1 13/35 Figure 18. Simplified block diagram VIN GND 3.3V reference BYP_ON VCC REF3 BYP 2.1V (falling thr.) VCC VCC_OK 3.2V (rising thr.) BYP_ON REF TON Ton_end FB Ton_pulse GND FB FB VCC-1V S1 S2 D C ENB Multiplexer GND BYP FB=0.9V EN_ok EN 2.4V (rising thr.) Not(Boot_fuses_OK) GND SW Sink mos 3.8 V generator SW GND LS mos HS mos HS gate driver LS gate driver HS command LS command Ton_start HS command - + PWM COMPARATOR S R Q Q + - + FB FB_REF ToffMIN=500ns Ton_pulse Ton_end GND Α*SW @ LS mos on 320mV 0mV EN SMPS_enable SW-GND @ LS mos on LS command Ton_start S R Q Q SW-GND @LS mos on 0mV - + REF 1.216V reference generator FB_REF=0.9V GND Vth_ref Bias reference generator EN REF_OK BIAS_OK Ith_bias REF_OK BIAS EN EN SMPS_enable EN EN SMPS_enable SMPS_enable EN EN SMPS_enable Fault Management OVP UVP OVERTEMP VCC_OK EN No Fault Boot_fuses_OK SS0, SS1 Start up managment VCC_OK BOOT_FUSES _ OK No Fault SMPS_enable SS0, SS1 FB UVP 62% of FB_REF EN SS_end Die temperature OVERTEMP 150°C EN Boot_fuses_OK BOOT_FUSES_OK EN_ok 120% of FB _REF FB Boot_fuses_OK OVP EN AM11778v1 |
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