TPS63805 datasheet(12/42 Pages) TI

12 / 42 page

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Figure 9-5. Peak-Current Architecture Operation

9.4.1.1 Reverse Current Operation, Negative Current

When the TPS63805, TPS63806, and TPS63807 are forced to PWM operation (MODE = HIGH), the device

current can flow in reverse direction. This happens by the negative current capability of the TPS63805,

TPS63806, and TPS63807. The error amplifier provides a peak-current target (voltage that is translated into

an equivalent current, see Figure 9-1), even if the target has a negative value. The maximum average current is

even more negative than the peak current.

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Figure 9-6. Peak-Current Operation, Reverse Current

9.4.1.2 Boost Operation

When VI is smaller than VO (and the voltages are not close enough to trigger buck-boost operation), the

TPS63805, TPS63806, and TPS63807 operate in boost mode where the boost high-side and low-side switches

are active. The buck high-side switch is always turned on and the buck low-side switch is always turned off. This

lets the TPS63805, TPS63806, and TPS63807 operate as a classical boost converter.

TPS63805, TPS63806, TPS63807

SLVSDS9E – JULY 2018 – REVISED AUGUST 2021

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TPS63805 Datasheet(PDF) 12 Page - Texas Instruments