ti power management lab kit series: practical learning ... · n.femia. ti power management lab kit...

N.Femia. TI Power Management Lab Kit Series: Practical Learning about Power Supply Design

TI Power Management Lab Kit Series: Practical Learning about

Power Supply Design

prof. Nicola Femia University of Salerno, ITALY


Outline

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• Introduction

• TI-PMLK overview

• Cost-Effective sensing and testing techniques

• TI-PMLK in the Lab:

• test #1, analysis of steady-state inductor current in buck regulator

• test #2, analysis of the impact of output capacitor and feedback compensation on buck regulator load-transient response

• test #3, analysis of TI-PMLK featuring dynamic electronic load emulation

• Final comments

• Questions and Answers


we do need power management everywhere

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power management = applied knowledge

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power management = applied knowledge

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figures of merit

methods models

semiconductor devices

passive devices

topologies control

techniques operating

parameters

in/out features

enhanced features

control ICs

features (product)

setups (decisions)

devices (technology)

engineering (knowledge)


TI-Power Management Lab Kit (TI-PMLK)

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Collection of Power Management Labs


TI-PMLK boards

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• 4 topologies: LDO, Buck, Boost, Buck-Boost • 2 LDO regulators: PNP pass device and N-channel FET pass device • 5 switching regulators: integrated FET and external FET, peak current control,

hysteretic control, emulated peak current control

Buck Lab LDO Lab Buck – Boost Lab Boost Lab


TI-PMLK Experiment Books

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Introduction to hardware: • provides all the information about the boards features and configurability needed to setup the regulator by means of jumpers, according to the goal of the test to be performed

schematic board schematic board

BOM configurability BOM configurability

notes and warnings



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Experiments: • guide the user in setting-up and performing the tests needed to analyze the regulator features defined in the experiment case-study • supports the understanding of the observed behavior with background theory and discussion of experimental results

case study

theory

configuration

connections

test procedure

results analysis

test procedure

results analysis

discussion

plots

plots


TI-PMLK Configurations and Experiments

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PMLK boards configuration options:

• input capacitor

• output capacitor

• inductor

• switching frequency

• operation mode

• current sensing resistance

• voltage feedback loop compensation

• current loop slope compensation

• soft-start time

• output voltage value

• output parasitic impedance

PMLK experiments:

• impact of switching frequency,

inductor, output capacitor, input

capacitor, in steady-state conditions

(line/load regulation, efficiency, ripple,

operation mode)

• impact of inductors, capacitors,

voltage compensation and current

compensation in ac and transient

conditions (line/load transient

response, PSRR, reverse PSRR)

• inductors saturation, current limit


TI-PMLK Experiment Tests

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efficiency

noise transient response

magnetics operation modes


TI-PMLK boosts power management learning

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• active hands-on experience using industry standard hardware • real application investigation, testing practice, system level reasoning • from basic to advanced topics • connecting interdisciplinary learning (physics, mathematics, circuit and

control theory, device technologies and characteristics) • facilitated power management laboratory setup


Professional Power Management Lab

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network analyzer

electronic load

current probe

dynamic source

Professional power management laboratory equipment facilitate power supply testing. However, expensive instrumentation is not strictly needed for TI-PMLK experiments, thanks to TI-PMLK cost-effective testing techniques


Load transient testing with electronic load

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dynamic electronic load


TI-PMLK Cost Effective load transient testing

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TI-PMLK featuring dynamic electronic load emulation


Line transient testing with dynamic supply

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dynamic power supply


TI-PMLK Cost Effective line transient testing

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TI-PMLK featuring dynamic power supply emulation

standard dc power supply


TI-PMLK Cost Effective testing techniques

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• N. Femia, "A cost-effective technique for dynamic testing of DC-DC power supplies“, 2017 IEEE International Conference on Industrial Technology (ICIT), Toronto, ON, Canada, 2017.

• N. Femia, "Feedback injection-based technique for dynamic load/line tests of DC power supplies part I: Theory“, 2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL), Trondheim, 2016.

• N. Femia, "Feedback injection-based technique for dynamic load/line tests of DC power supplies part II: Applications“, 2016 IEEE 17th Workshop on Control and Modeling for Power Electronics (COMPEL), Trondheim, 2016.

• N. Femia, "Feedback Injection-based Technique for DC-DC power supplies transient and AC response testing“, IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, Florence, 2016.


Steady-State inductor current sensing

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current sensing transformer

Tout in

RV = I

N

TI-PMLK CST current sensing board


Steady-State inductor current sensing

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current probe

current transformer


DC and Transient input/output current sensing

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INA 139 current shunt monitor



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TI-PMLK CS current sensing board



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current probe

INA139 current shunt

• the TI-PMLK INA139 current-shunt sensing board can replace the current probe

• a standard voltage probe is sufficient for steady-state inductor current ripple measurement


TI-PMLK Cost Effective current sensing guides

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contact TI Universty Program


TI-PMLK desk lab

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TI-PMLK featuring adjustable/dynamic source

TI-PMLK featuring adjustable/dynamic load

TI-PMLK under test

dc power supply waveform generator oscilloscope


TI-PMLK summary

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• TI-PMLK enable innovative hands on power management learning, bridging the gap between theory and reality

• TI-PMLK hardware configurability allows to investigate the main issues of power management and to understand the properties and performances of dc-dc power supplies

• TI-PMLK Experiment Books provide theory background, testing guidance, discussion and examples to help understanding power management concepts and experimental observations and to connect power supply setup to resulting performances

• Users can expand their own experience by exploiting the easy configurability and the possibility of interconnection of TI-PMLK boards, which allow investigations on interdisciplinary topics thus elevating learning and knowledge beyond power management

• TI-PMLK simplified sensing and testing techniques make easy to setup a cost effective power management laboratory

N.Femia. TI Power Management Lab Kit Series: Practical Learning about Power Supply Design 28

For more information on TI-PMLK please contact [email protected] For courses and training on power management with TI-PMLK please contact [email protected]

Questions?

ti power management lab kit series: practical learning ... · n.femia. ti power management lab kit...

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