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TPS630241YFFT Datasheet(PDF) 14 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]
Página de inicio  http://www.ti.com
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TPS630241YFFT Datasheet(HTML) 14 Page - Texas Instruments

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Output Current Buck
I
= (
x I ) / D
OUT
IN
0
V
OUT
Duty Cycle Buck
D =
V
IN
Output Current Boost
I
=
x I (1-D)
OUT
IN
0
V
- V
IN
OUT
Duty Cycle Boost
D =
V
OUT
TPS63024
TPS630241, TPS630242
SLVSCK8A – NOVEMBER 2014 – REVISED DECEMBER 2014
www.ti.com
Device Functional Modes (continued)
9.4.3 Current Limit
The current limit variation depends on the difference between the input and output voltage. The maximum current
limit value is at the highest difference.
Given the curves provided in Figure 5, it is possible to calculate the output current reached in boost mode, using
Equation 1 and Equation 2 and in buck mode using Equation 3 and Equation 4.
(1)
(2)
(3)
(4)
With,
η = Estimated converter efficiency (use the number from the efficiency curves or 0.90 as an assumption)
IIN= Minimum average input current (Figure 5)
9.4.4 Supply and Ground
The TPS63024x provides two input pins (VIN and VINA) and two ground pins (PGND and GND).
The VIN pin supplies the input power, while the VINA pin provides voltage for the control circuits. A similar
approach is used for the ground pins. GND and PGND are used to avoid ground shift problems due to the high
currents in the switches. The reference for all control functions is the GND pin. The power switches are
connected to PGND. Both grounds must be connected on the PCB at only one point, ideally, close to the GND
pin.
9.4.5 Device Enable
The device starts operation when the EN pin is set high. The device enters shutdown mode when the EN pin is
set low. In shutdown mode, the regulator stops switching, all internal control circuitry is switched off, and the load
is disconnected from the input.
14
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Product Folder Links: TPS630241 TPS630242


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