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STM32H757AI 数据表(PDF) 113 Page - STMicroelectronics |
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STM32H757AI 数据表(HTML) 113 Page - STMicroelectronics |
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113 / 251 page  DS12931 Rev 1 113/251 STM32H757xI Electrical characteristics 230 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 27. The SMPS step-down converter requires external components that are specified in Figure 16 and Table 26. Figure 16. External components for SMPS step-down converter Table 25. 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 26. 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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