Texas Instruments LM5013-Q1EVM Manual de usuario

User’s Guide

LM5013-Q1EVM User's Guide

ABSTRACT

The LM5013-Q1EVM has a 100-V DC/DC buck regulator that employs asynchronous rectification and achieves

high conversion efficiency. The EVM operates over a wide input voltage range of 15-V to 100-V to provide a

regulated 12-V output at 300-kHz switching frequency. The module design uses the LM5013-Q1 asynchronous

buck converter with wide input voltage (wide VIN) range, wide duty-cycle range, integrated high-side power

MOSFET, cycle-by-cycle overcurrent protection, and precision enable. With AEC-Q100 grade 1 automotive

qualification, the LM5013-Q1 is rated to operate over a junction temperature range of –40°C to +150°C. The

LM5013-Q1 is available in an 8-pin SO PowerPAD™ package to enable high density, low component count

DC/DC solutions.

Use the LM5013-Q1 with WEBENCH® Power Designer LM5013-Q1 with WEBENCH® Power Designer to

create a custom regulator design.

Table of Contents

1 General TI High Voltage Evaluation User Safety Guidelines.............................................................................................. 2

2 Overview..................................................................................................................................................................................4

2.1 LM5013-Q1 Asynchronous Buck Converter.......................................................................................................................4

3 LM5013-Q1 Evaluation Module..............................................................................................................................................5

3.1 Quick Start Procedure........................................................................................................................................................5

3.2 Detailed Descriptions......................................................................................................................................................... 6

4 Schematic................................................................................................................................................................................8

5 PCB Layout..............................................................................................................................................................................9

6 Bill of Materials..................................................................................................................................................................... 10

7 Performance Curves.............................................................................................................................................................11

8 Revision History................................................................................................................................................................... 12

List of Figures

Figure 2-1. LM5013-Q1 Pin Configuration (8-Pin SO Package with PowerPAD, Top View)........................................................4

Figure 2-2. LM5013-Q1 Buck Regulator Simplified Schematic................................................................................................... 4

Figure 3-1. LM5013-Q1 EVM Top View....................................................................................................................................... 5

Figure 4-1. LM5013-Q1 EVM Schematic.....................................................................................................................................8

Figure 5-1. Top Layer and Silkscreen Layer................................................................................................................................ 9

Figure 5-2. Mid-Layer 1 Ground Plane........................................................................................................................................ 9

Figure 5-3. Mid-Layer 2 Routing.................................................................................................................................................. 9

Figure 5-4. Bottom Layer Routing................................................................................................................................................9

Figure 7-1. Thermal Capture of EVM: VIN = 48-V, VOUT = 12-V, IOUT= 1.5-A.............................................................................11

List of Tables

Trademarks

PowerPAD™ is a trademark of Texas Instruments.

All trademarks are the property of their respective owners.

www.ti.com Table of Contents

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LM5013-Q1EVM User's Guide 1

1 General TI High Voltage Evaluation User Safety Guidelines

WARNING

Always follow TI’s set-up and application instructions, including use of all interface components within their

recommended electrical rated voltage and power limits. Always use electrical safety precautions to help ensure

your personal safety and the safety of those working around you. Contact TI’s Product Information Center http://

support.ti.com for further information.

Save all warnings and instructions for future reference.

Failure to follow warnings and instructions may result in personal injury, property damage, or death due

to electrical shock and/or burn hazards.

The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed printed-

circuit board assembly. It is intended strictly for use in development laboratory environments, solely for qualified

professional users having training, expertise, and knowledge of electrical safety risks in development and

application of high-voltage electrical circuits. Any other use and/or application are strictly prohibited by Texas

Instruments. If you are not suitably qualified, you should immediately stop from further use of the HV EVM.

•Work Area Safety:

– Maintain a clean and orderly work area.

– Qualified observer(s) must be present anytime circuits are energized.

– Effective barriers and signage must be present in the area where the TI HV EVM and its interface

electronics are energized, indicating operation of accessible high voltages may be present, for the

purpose of protecting inadvertent access.

– All interface circuits, power supplies, evaluation modules, instruments, meters, scopes, and other related

apparatus used in a development environment exceeding 50 VRMS/75 VDC must be electrically located

within a protected Emergency Power Off (EPO) protected power strip.

– Use a stable and non-conductive work surface.

– Use adequately insulated clamps and wires to attach measurement probes and instruments. No freehand

testing whenever possible.

•Electrical Safety:

As a precautionary measure, it is always a good engineering practice to assume that the entire EVM may

have fully accessible and active high voltages.

– De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing any

electrical or other diagnostic measurements. Confirm that TI HV EVM power has been safely de-

energized.

– With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring,

measurement equipment hook-ups, and other application needs, while still assuming the EVM circuit and

measuring instruments are electrically live.

– When EVM readiness is complete, energize the EVM as intended.

WARNING

While the EVM is energized, never touch the EVM or its electrical circuits as they could be

at high voltages capable of causing electrical shock hazard.

General TI High Voltage Evaluation User Safety Guidelines www.ti.com

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•Personal Safety:

– Wear personal protective equipment, for example, latex gloves and/or safety glasses with side shields or

protect EVM in an adequate lucent plastic box with interlocks from accidental touch.

•Limitation for Safe Use:

– EVMs are not to be used as all or part of a production unit.

Safety and Precautions

The EVM is designed for professionals who have received the appropriate technical training, and is designed

to operate from an AC power supply or a high-voltage DC supply. Please read this user guide and the safety-

related documents that come with the EVM package before operating this EVM.

CAUTION

Do not leave the EVM powered when unattended.

WARNING

Hot surface! Contact may cause burns. Do not touch! A fan should be utilized if full-power operation

is done. The EVM was constructed to highlight the small solutize size and as a result, is not as

thermally optimized as typical application PCB.

WARNING

High Voltage! Electric shock is possible when connecting board to live wire. Board should be

handled with care by a professional.

For safety, use of isolated test equipment with overvoltage and overcurrent protection is highly

recommended.

www.ti.com General TI High Voltage Evaluation User Safety Guidelines

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LM5013-Q1EVM User's Guide 3

2 Overview

2.1 LM5013-Q1 Asynchronous Buck Converter

The LM5013-Q1 step-down switching converter features all the functions needed to implement a low-cost,

high-efficiency buck regulator capable of supplying 3.5-A load current. An adaptive constant on-time (COT)

control scheme and PFM at light loads enables low standby current. Various features incorporated for enhanced

reliability and safety include cycle-by-cycle peak current limit, thermal shutdown protection, internal output

voltage soft-start timer, precision enable , and an open-drain PGOOD indicator for sequencing and fault

reporting.

Figure 2-1 shows the pin configuration of the LM5013-Q1. Figure 2-2 presents the regulator schematic for quick

reference.

Figure 2-1. LM5013-Q1 Pin Configuration (8-Pin SO Package with PowerPAD, Top View)

Figure 2-2. LM5013-Q1 Buck Regulator Simplified Schematic

Overview www.ti.com

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3 LM5013-Q1 Evaluation Module

The LM5013-Q1EVM is configured to deliver 12-V at up to 3.5-A at a switching frequency of 300-kHz. As

shown in LM5013-Q1EVM schematic, a type 3 ripple generation circuit is used to generate the appropriate

voltage ripple on FB. This circuit uses an RC network (consisting of "R4" and "C4") between SW and VOUT

to create a triangular ramp. This triangular ramp is then AC coupled into the feedback node with capacitor

"C16." This method is best suited for applications where low output voltage ripple is required and where ceramic

output capacitors are used (since it is not using the output voltage to generate the ripple signal). If additional

output ripple can be managed, a possibility for reduced BOM count can be achieved with type 1 or type 2

compensation. Reference the data sheet for these implementations.

3.1 Quick Start Procedure

1. Connect the voltage supply between VIN and GND connectors using short wires.

2. Connect the load of the converter between VOUT and GND connectors using short wires.

3. Set the supply voltage (VVIN) at an appropriate level between 15-V to 100-V. Set the current limit of the

supply to an appropriate level as well.

4. Turn on the power supply. The EVM powers up and provides VOUT = 12-V.

5. Monitor the output voltage while increasing the load current to max.

See Figure 3-1 for the location of the connectors.

Figure 3-1. LM5013-Q1 EVM Top View

CAUTION

Caution Hot surface.

Contact may cause burns.

Do not touch.

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LM5013-Q1EVM User's Guide 5

3.2 Detailed Descriptions

This section describes the connectors and the test points on the EVM and how to properly connect, set up and

use the LM5013-Q1EVM. See Figure 3-1 for a top view of the EVM.

VOUT Output voltage of the converter.

VOUT connector and test point connected to the power inductor and the output capacitors. Connect

the loading device between VOUT and GND connectors to provide loading to the regulator. Connect

the loading device to the board with short wires to handle the DC output current.

GND Ground of the converter.

It is connected to the GND as well as the return terminals of the input and output capacitors. GND

is the current return path for both supply voltage and load. Connect to supply and load grounds with

short wires.

VIN Input voltage to the converter.

VIN connector and test point connects to the input capacitors and the VIN pin of the LM5013-Q1.

Connect the supply voltage from a power supply or a battery between the VIN and GND connectors.

The voltage range should be higher than 6 V for the device to be active. VVIN higher than 15-V

provides a regulated 12-V output voltage. To avoid damaging the device VVIN should be no greater

than 100-V. The current limit on the supply should be high enough to provide the needed supply

current when the output is fully loaded. The supply voltage should be connected to the board with

short wires. C7 is populated to avoid oscillation between the cable parasitic inductance and the

low-ESR input ceramic capacitors.

VIN-EMI Input voltage to input filter of the converter.

The supply voltage should be connected to the board with short wires.

The inductor/ferrite in series with input path have some DCR associated with them. Verifying

datasheet specification should be done by shorting these components.

GND-

EMI

Ground connection near the input filter.

This is the current return path for the supply connected to VIN-EMI. It provides a direct connection

to the input filter capacitors to filter conducted noise generated by the converter. Use VIN-EMI and

GND-EMI connections at the input filter to minimize EMI.

Input

Filter

EMI mitigation.

The input filter consists of a filter inductor, ferrite bead and ceramic capacitors. An electrolytic

capacitor is included for bulk energy storage and input parallel damping.

EN/

UVLO

Test point to monitor the EN/UVLO pin of the device.

This test point is to monitor the voltage on the device EN/UVLO pin.

EN/

UVLO

Set EN/UVLO

By default, device is hard-enabled. Device enable/disable voltage would correspond to typical

VEN-RISING and VEN-FALLING datasheet specification.

The enable/disable voltage can be varied by calculating for bottom UVLO resistor RUV2.

Calculate the lower UVLO resistor, RUV2 (R6), based on the desired turn-on voltage of 6 V and the

selected upper UVLO resistor, RUV1 (R5) , of 1 MΩ using Equation 1.

UV2 UV1

IN(on)

1.5 V 1.5 V

R R 1M 332k

V 1.5 V 6 V 1.5 V

˜ ˜ : :

 

(1)

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PGOOD PGOOD

This flag indicates whether the output voltage has reached its regulation level. LM5013-Q1 PGOOD

is an open-drain output that is tied to VOUT through pull-up resistor.

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LM5013-Q1EVM User's Guide 7

4 Schematic

Figure 4-1. LM5013-Q1 EVM Schematic

Note the ripple injection circuit was designed for minimum ripple at the nominal input voltage of the design of 48 V. The circuit should be re-designed if

the nominal voltage is lower, or make sure ensure there is sufficient ripple injection for stability at lower input voltages (< 30 V).

Schematic www.ti.com

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5 PCB Layout

Top Layer and Silkscreen Layer through Bottom Layer Routing show the board layout for the LM5013-Q1EVM.

The EVM offers resistors, capacitors, and test points to configure the output voltage, precision enable, and

switching frequency.

The 8-pin SO PowerPAD package offers an exposed thermal pad, which must be soldered to the copper landing

on the PCB for optimal thermal performance. The PCB consists of a 4-layer design. There are 2-oz copper

planes on the top and bottom and 1-oz copper mid-layer planes to dissipate heat with an array of thermal vias

under the thermal pad to connect to all four layers.

Test points have been provided for ease of use to connect the power supply, required load, and to monitor critical

signals.

Figure 5-1. Top Layer and Silkscreen Layer Figure 5-2. Mid-Layer 1 Ground Plane

Figure 5-3. Mid-Layer 2 Routing Figure 5-4. Bottom Layer Routing

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LM5013-Q1EVM User's Guide 9

6 Bill of Materials

Designator Quantity Description PartNumber

C2, C11, C13 3 CAP, CERM, 0.1 µF, 100 V,+/- 10%, X7R, AEC-Q200 Grade

1, 0603

HMK107B7104KAHT

C3 1 Chip Capacitor, 2.2 nF, +/- 10%, 50 V, -55 to 125 degC,

0402 (1005 Metric), RoHS, Tape and Reel

GRM155R71H222KA01D

C4 1 CAP, CERM, 3300 pF, 100 V, +/- 10%, X7R, AEC-Q200

Grade 1, 0603

CEU3E2X7R2A332K080AE

C5, C6 2 CAP, CERM, 22 µF, 25 V,+/- 10%, X7R, 1210 CL32B226KAJNFNE

C7 1 CAP, AL, 33 uF, 100 V, +/- 20%, 0.7 ohm, AEC-Q200 Grade

2, SMD

EEE-FK2A330P

C8, C9 2 CAP, CERM, 4.7 uF, 100 V, +/- 10%, X7S, 1210 C3225X7S2A475K200AE

C10, C12 2 CAP, CERM, 4.7 uF, 100 V, +/- 10%, X7S, AEC-Q200 Grade

1, 1210

CGA6M3X7S2A475K200AB

C16 1 Cap Ceramic 56pF 50V C0G 5% SMD 0402 125C Paper

T/R

CL05C560JB5NNNC

D1 1 Diode Schottky 120V 8A 3-Pin(2+Tab) SMPC T/R V8P12-M3/86A

J1, J2 2 Terminal Block, 3.5mm Pitch, 2x1, TH ED555/2DS

L1 1 22µH Shielded Molded Inductor 3.5A 74mOhm Max

Nonstandard

74437368220

L2 1 Ferrite Bead, 220 ohm @ 100 MHz, 4 A, 1206 FBMH3216HM221NTV

L3 1 Shielded Power Inductors XGL4020-822MEC

R2 1 RES, 0, 0%, 0.2 W, AEC-Q200 Grade 0, 0402 CRCW04020000Z0EDHP

R4 1 RES, 453 k, 1%, 0.1 W, 0603 RC0603FR-07453KL

R5 1 RES, 1.00 M, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW04021M00FKED

R6 1 RES, 330 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW0402330KFKED

R7 1 RES, 102 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW0402102KFKED

R8 1 RES, 453 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW0402453KFKED

R9 1 RES, 49.9 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW040249K9FKED

R10 1 RES, 100 k, 1%, 0.063 W, 0402 RC1005F104CS

TP1, TP2 2 Test Point, Multipurpose, White, TH 5012

U1 1 100-V Input, 3.5-A Non-Synchronous Buck DC/DC

Converter with Ultra-low IQ

LM5013QDDARQ1

C1 0 CAP, CERM, 56 pF, 100 V, +/- 5%, C0G/NP0, 0603 GRM1885C2A560JA01D

C14, C15 0 CAP, CERM, 22 uF, 25 V, +/- 10%, X7R, AEC-Q200 Grade

1, 1210

TMK325B7226KMHT

C17 0 Chip Capacitor, 100 pF, +/- 10%, 50 V, -55 to 125 degC,

0402 (1005 Metric), RoHS, Tape and Reel

C1005C0G1H101K050BA

R1, R3 0 RES, 1.00, 0.5%, 0.1 W, 0603 RT0603DRE071RL

Bill of Materials www.ti.com

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