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STPM098C Datasheet(PDF) 78 Page - STMicroelectronics |
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STPM098C Datasheet(HTML) 78 Page - STMicroelectronics |
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78 / 110 page  3.14.5 Loop compensator The converter block diagram can be simplified as illustrated in the Figure 63, where an equivalent single-phase converter is considered along with only first order parasitics (inductance DCR and output capacitance ESR). Figure 63. Converted simplified block diagram PWM Modulator Compensator DRV RDCR VIN SW L RO RC CO PGND VOUT STPM098C Loop Controller xN POWER STAGE RPD RPU xN VID(s) + - RLL Resistor Divider PGND The small-signal average model of the control loop can be represented as follows: Figure 64. Closed loop transfer function Compensator GC(s) GM(s) PWM Modulator VID(s) Power Stage GP(s) + - VC(s) VE(s) VOUT(s) d(s) In order to guarantee a good closed-loop stability along with a full set of power stages, the converted error signal is fed to a cascade of a first single-pole LP filter followed by the PID (proportional integral derivative) compensator and an additional single-pole LP filter. STPM098C Functional description DS14440 - Rev 1 page 78/110 |
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