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TPS51513RHBT Datasheet(PDF) 23 Page - Texas Instruments

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Part No. TPS51513RHBT
Description  SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS51513RHBT Datasheet(HTML) 23 Page - Texas Instruments

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TPS51513
www.ti.com
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
Step Eleven: Select decoupling and peripheral components.
For TPS51513 peripheral capacitors please use the following minimum values of ceramic capacitance. X5R or
better temperature coefficient is recommended. Tighter tolerances and higher voltage ratings are always OK.
V5IN decoupling
≥ 2.2mF, ≥ 10V
V5FILT decoupling
≥ 1mF, ≥ 10V
VREF decoupling 0.22 mF to 1mF, ≥ 4V
Bootstrap capacitors
≥ 0.22mF, ≥ 10V
Bootstrap diode (optional) 30V Schottky diode, BAT-54 or better
For power chain and other component selection, see Table 2.
Control Loop Design
The TPS51513 control architecture (current-mode, constant on-time) has been analyzed by the Center for Power
Electronics Systems (CPES) at Virginia Polytechnic and State University. The following equations are from their
presentation: Equivalent Circuit Representation of Current-Mode Control from November 21, 2008.
One of the benefits of this technology is the lack of the sample and hold effect that limits the bandwidth of fixed
frequency current mode controllers and causes sub-harmonic oscillations.
The loop gain is the gain of the DROOP amplifier multiplied by the control-to-output gain:
Control-to-Output
The control-to-output gain is given by the expression:
(20)
where
(21)
(22)
(23)
(24)
For this converter,
(25)
The frequency response of the control-to-output gain can be graphed using the following parameters:
VIN = 12 V
VOUT = 1.05 V
Copyright © 2009–2010, Texas Instruments Incorporated
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