公开(公告)号：JP2000299978A

公开(公告)日：2000-10-24

申请号：JP2000035366

申请日：2000-02-14

Applicant: ANALOG DEVICES INC

Inventor： REDL RICHARD ,  ERISMAN BRIAN P ,  AUDY JONATHAN M ,  REIZIK GABOR

IPC: H02M3/155 ,  G05F1/565

Abstract: PROBLEM TO BE SOLVED: To minimize the capacitor size by maintaining the regulator's output voltage within specified boundaries for large bi-directional step change in load current. SOLUTION: A current sensor 64 at a controllable power stage 50 generates an output signal which varies along with the output current from the power stage 50. A current controller 66 receives the output signal thus generated along with the output 62 from a voltage error amplifier 59 to produce an output 67. In response to the output 67 from the current controller 66, a power circuit 68 generates an output voltage Vout. The output capacitor 56 of the power circuit 68, i.e., a regulator, maintains the output voltage within a boundary specified for the bi-directional step change in load current. Consequently, the capacitor size is minimized and the power circuit 68 can be compensated.