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STM32H747AI 数据表(PDF) 114 Page - STMicroelectronics |
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STM32H747AI 数据表(HTML) 114 Page - STMicroelectronics |
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114 / 252 page  Electrical characteristics STM32H747xI/G 104/242 DS12930 Rev 1 6.3.3 SMPS step-down converter The devices embed a high power efficiency SMPS step-down converter. SMPS characteristics for external usage are given in Table 26. The SMPS step-down converter requires external components that are specified in Figure 16 and Table 25. Figure 16. External components for SMPS step-down converter Table 24. VCAP operating conditions(1) 1. When bypassing the voltage regulator, the two 2.2 µF VCAP capacitors are not required and should be replaced by two 100 nF decoupling capacitors. Symbol Parameter Conditions CEXT Capacitance of external capacitor 2.2 µF(2) 2. This value corresponds to CEXT typical value. A variation of +/-20% is tolerated. ESR ESR of external capacitor < 100 m Ω MSv61398V2 VCAP VCAP VDDLDO VDDLDO VDDSMPS VDDSMPS VLXSMPS VLXSMPS V reg (OFF) V reg (OFF) VDD VDD SMPS (ON) SMPS (ON) VSSSMPS VSSSMPS VFBSMPS VFBSMPS VSS VSS VCORE VCORE Cin L Cout1 Cout2 Cfilt VCAP VCAP VDDLDO VDDLDO VDDSMPS VDDSMPS VLXSMPS VLXSMPS V reg (ON) V reg (ON) VDD VDD SMPS P (ON N) SMPS (ON) VSSSMPS VSSSMPS VFBSMPS VFBSMPS VSS VSS VCORE VCORE Cin L 2xCout CEXT Cfilt Direct SMPS supply External SMPS supply, LDO supplied by SMPS VDD_ External VDD_ External Table 25. Characteristics of SMPS step-down converter external components Symbol Parameter Conditions Cin Capacitance of external capacitor on VDDSMPS 4.7 µF ESR of external capacitor 100 mΩ Cfilt Capacitance of external capacitor on VLXSMPS pin 220 pF COUT Capacitance of external capacitor on VFBSMPS pin 10 µF ESR of external capacitor 20 mΩ L Inductance of external Inductor on VLXSMPS pin 2.2 µH - Serial DC resistor 150 mΩ |
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