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Power management circuit

專利號(hào)
US11888399B2
公開(kāi)日期
2024-01-30
申請(qǐng)人
ROHM CO., LTD.（JP Kyoto）
發(fā)明人
Kazunori Itou
IPC分類
H02M3/158; H02M1/00; H02M1/08; H02M1/32
技術(shù)領(lǐng)域
transistor,circuit,mode,pin,first,second,blk2,blk1,mh1,feedback
地域： Kyoto

摘要

In a first mode, a first feedback controller generates a first control signal SCTRL1 based on a signal at a first feedback pin, so as to control a first pre-driver. A second feedback controller ￥ generates a second control signal based on a signal at a second feedback pin, so as to control a second pre-driver. In a second mode, the first feedback controller ￥ generates the first control signal based on a signal at the first feedback pin, so as to control the first pre-driver. The second pre-driver drives the second pre-driver based on a third control signal received from a first circuit block.

說(shuō)明書

The sequencer 140 controls the start/stop timings for each of the first circuit block BLK1 and the second circuit block BLK2.

First Mode

The first mode is a mode in which the first circuit block BLK1 and the second circuit block BLK2 operate completely independently. The power management circuit 100 forms a DC/DC converter having two outputs (two channels) together with external components.

In the first mode, a feedback signal VFB1 that corresponds to an output signal of the first-channel DC/DC converter is fed back to the FB1 pin. Furthermore, a feedback signal VFB2 that corresponds to the second-channel DC/DC converter is fed back to the FB2 pin. The first feedback controller 110_1 generates a first control signal SCTRL1 based on the feedback signal VFB1 input to the FB1 pin. Furthermore, the second feedback controller 110_2 generates a second control signal SCTRL2 based on the feedback signal VFB2 input to the FB2 pin.

The configuration and the control method employed in the feedback controller 110 are not restricted in particular. For example, the feedback controller 110 may be configured as a voltage-mode controller. Also, the feedback controller 110 may be configured as a peak-current-mode or an average-current-mode controller. Alternatively, the feedback controller 110 may be configured as a ripple-control controller using a hysteresis control (Bang-Bang control) method, bottom detection on-time fixed control method, peak detection off-time fixed control method, or the like.

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