Steven Voepel Digital Signal Processing Solutions Abstract T

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Dual Power Supply Recommendations TMS320C206
Steven Voepel Digital Signal Processing Solutions
Abstract
This document describes options used supply power Texas Instruments (TITM) TMS320C206 digital signal processor (DSP). TMS320C206 requires 3.3V 5.0V I/O. first solution applies when design already regulated 5.0V power supply requires only 3.3V (LDO) Dropout regulator. second solution applies unregulated voltage input both regulators generate 5.0V 3.3V voltages. voltage requirements become stricter, tighter tolerance regulators, such TPS71/72/73 families LDOs, required.
Contents
Design Problem Solution
Figures
Figure Supplying Power TMS320C206 with Existing Regulated 5.0V Supply.3 Figure Supplying Power TMS320C206 Using 5.0V 3.3V Regulators.4
Digital Signal Processing Solutions
December 1998
Design Problem
What some options available supply power TMS320C206 DSP, which requires 3.3V 5.0V I/O?
Solution
scenarios discussed apply proper power TMS320C206. first solution applies when design already regulated 5.0V power supply requires only 3.3V (LDO) Dropout regulator, shown Figure Figure shows second solution, which unregulated voltage input applied both regulators generate 5.0V 3.3V voltages. voltage requirements become stricter, tighter tolerance regulators, such TPS71/72/73 families LDOs, required. Texas Instruments provides wide range fixed adjustable LDOs with load currents ranging from 150ma 750ma. examples shown this document fixed voltage LDOs. typical application maximum load currents 250ma 500ma common. maximum output load current TPS72xx series 250ma TPS71xx series 500ma. NOTE: TMS320C206 common ground between 5.0V 3.3V power. Detailed information regarding TPS71xx (literature number SLVS092F) TPS72xx (literature number SLVS102E) found site, www.ti.com.
Dual Power Supply Recommendations TMS320C206
Figure Supplying Power TMS320C206 with Existing Regulated 5.0V Supply
5.0V
Power-Good Indicator
5.0V
250k
TPS7133 TPS7233
3.3V
SENSE
Note: large line transients expected, input capacitance should increased above minimum value shown. large load transients expected, output capacitance should increased above minimum value shown. Input output capacitors should located close possible should located close load.
Dual Power Supply Recommendations TMS320C206
Figure Supplying Power TMS320C206 Using 5.0V 3.3V Regulators
5.41V
250k Power-Good Indicator
TPS7150 TPS7250
Vdd5 5.0V
SENSE
250k Power-Good Indicator
TPS7133 TPS7233
3.3V
SENSE
Note: large line transients expected, input capacitance should increased above minimum value shown. large load transients expected, output capacitance should increased above minimum value shown. Input output capacitors should located close possible should located close load.
Dual Power Supply Recommendations TMS320C206
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Dual Power Supply Recommendations TMS320C206

Steven Voepel Digital Signal Processing Solutions Abstract T

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