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TPS630241YFFT Datasheet(PDF) 12 Page - Texas Instruments

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No. de Pieza. TPS630241YFFT
Descripción  High Current, High Efficiency Single Inductor Buck-Boost Converter
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
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TPS630241YFFT Datasheet(HTML) 12 Page - Texas Instruments

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Ramp and Clock
TPS630241, TPS630242
9.4 Device Functional Modes
Control Loop Description
Figure 3. Average Current Mode Control
The controller circuit of the device is based on an average current mode topology. The average inductor current
is regulated by a fast current regulator loop which is controlled by a voltage control loop. Figure 3 shows the
control loop.
The non inverting input of the transconductance amplifier, gmv, is assumed to be constant. The output of gmv
defines the average inductor current. The inductor current is reconstructed by measuring the current through the
high side buck MOSFET. This current corresponds exactly to the inductor current in boost mode. In buck mode
the current is measured during the on time of the same MOSFET. During the off time, the current is
reconstructed internally starting from the peak value at the end of the on time cycle. The average current and the
feedback from the error amplifier gmv forms the correction signal gmc. This correction signal is compared to the
buck and the boost sawtooth ramp giving the PWM signal. Depending on which of the two ramps the gmc output
crosses either the Buck or the Boost stage is initiated. When the input voltage is close to the output voltage, one
buck cycle is always followed by a boost cycle. In this condition, no more than three cycles in a row of the same
mode are allowed. This control method in the buck-boost region ensures a robust control and the highest
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