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PM6685 数据表(PDF) 23 Page - STMicroelectronics |
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PM6685 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 52 page  PM6685 Device description 23/52 Figure 29. Constant ON-time block diagram 7.3 Output ripple compensation In a classic Constant On Time control, the system regulates the valley value of the output voltage and not the average value, as shown in Figure 28 on page 21. In this condition, the output voltage ripple is source of a DC static error. To compensate this error, an integrator network can be introduced in the control loop, by connecting the output voltage to the COMP5/COMP3(for the 5V and 3.3V sections respectively) pin through a capacitor CINT as in Figure 30 on page 24. + - HS HS driver driver Level Level shifter shifter LS LS driver driver Q Q R S LDO5 LDO5 Q R S PWM PWM Comparator Comparator Positive Positive Current Limit Current Limit Vr Vr + - Zero Zero--cross. cross. Comp. Comp. bandgap bandgap 1.236V 1.236V SKIP SKIP VREF VREF PHASE PHASE PGND PGND LGATE LGATE HGATE HGATE BOOT BOOT CSENSE CSENSE COMP COMP gm gm OUT OUT RFb1 RFb1 RFb2 RFb2 Vr Vr Vr Vr + + - Toff Toff--min min Ton Ton + - VIN VIN 0.5V + - 0.5V + - 0.25V LDO5 LDO5 + - HS HS driver driver Level Level shifter shifter LS LS driver driver Q Q R S LDO5 LDO5 Q R S PWM PWM Comparator Comparator Positive Positive Current Limit Current Limit Vr Vr + - Zero Zero--cross. cross. Comp. Comp. bandgap bandgap 1.236V 1.236V SKIP SKIP VREF VREF PHASE PHASE PGND PGND LGATE LGATE HGATE HGATE BOOT BOOT CSENSE CSENSE COMP COMP gm gm OUT OUT RFb1 RFb1 RFb2 RFb2 Vr Vr Vr Vr + + - + - Toff Toff--min min Ton Ton + - VIN VIN 0.5V + - 0.5V + - 0.5V + - 0.25V + - 0.25V LDO5 LDO5 |
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