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PM6685 Datasheet(PDF) 38 Page - STMicroelectronics |
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PM6685 Datasheet(HTML) 38 Page - STMicroelectronics |
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38 / 52 page  Monitoring and protections PM6685 38/52 A rectifier across the low side MOSFET is recommended. The rectifier works as a voltage clamp across the synchronous rectifier and reduces the negative inductor swing during the dead time between turning the high-side MOSFET off and the synchronous rectifier on. It can increase the efficiency of the switching section, since it reduces the low side switch losses. A schottky diode is suitable for its low forward voltage drop (0.3V). The diode reverse voltage must be greater than the maximum input voltage VINmax. A minimum recovery reverse charge is preferable. Below there is a list of some schottky diode manufacturers. 8.11 Closing the integrator loop The design of external feedback network depends on the output voltage ripple. If the ripple is higher than approximately 30mV, the feedback network (Figure 36) is usually enough to keep the loop stable. Figure 36. Circuitry for output ripple compensation Table 16. Dual MOSFET manufacturer Manufacturer Type RDSon (mΩ) Gate charge (nC) Rated reverse voltage (V) ST STS8DNH3LL 25 10 30 ST STS4DNF60L 65 32 60 Table 17. Schottky diode manufacturer Manufacturer Series Forward voltage (V) Rated reverse voltage (V) Reverse current (uA) ST STPS1L30M 0.34 30 0.00039 ST STPS1L20M 0.37 20 0.000075 + - Vr Vr COMP COMP gm gm OUT OUT RFb1 RFb1 RFb2 RFb2 Vr Vr + PWM PWM Comparator Comparator CINT CINT RINT RINT CFILT CFILT t Vr COUT COUT COMP PIN VOLTAGE L L D D OUTPUT VOLTAGE I=gm(V1-Vr) V1 V1 t ∆V ∆V VCINT VCINT ROUT ROUT + - Vr Vr COMP COMP gm gm OUT OUT RFb1 RFb1 RFb2 RFb2 Vr Vr + PWM PWM Comparator Comparator CINT CINT RINT RINT CFILT CFILT t Vr COUT COUT COMP PIN VOLTAGE L L D D OUTPUT VOLTAGE I=gm(V1-Vr) V1 V1 t ∆V ∆V VCINT VCINT ROUT ROUT |
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