Texas Instruments TPS40193EVM-001 Manuale utente

User's GuideSLUU274 – May 2007

Using the TPS40193EVM-001

The TPS40193EVM-001 evaluation module is a 12V to 1.8V synchronous buckconverter built around the TPS40193 synchronous buck controller. This moduleprovides a convenient test platform for both evaluating the TPS40193 controller in areal application and prototyping synchronous buck converters using the TPS40193controller.

Contents1 Introduction .......................................................................................... 22 TPS40193EVM-001 Electrical Performance Specifications ................................... 33 Schematic ........................................................................................... 44 General Configuration and Description .......................................................... 55 Test Setup ........................................................................................... 86 TPS40193EVM-001 Typical Performance Data and Characteristic Curves............... 117 EVM Assembly Drawings and Layout .......................................................... 148 Bill of Materials .................................................................................... 18

List of Figures

1 TPS40193EVM-001 Schematic ................................................................... 42 TPS40193EVM-001 Recommended Test Setup ............................................... 93 TPS40193EVM-001 Output Ripple Measurement—Tip and Barrel Using TP15 andTP16 .................................................................................................. 94 TPS40193EVM-001 Control Loop Measurement Setup ..................................... 105 TPS40193EVM-001 Efficiency vs Load Current .............................................. 116 TPS40193EVM-001 Output Voltage vs Load Current ( ±0.5% Window Shown) .......... 127 TPS40193EVM-001 Output Voltage Ripple ................................................... 128 TPS40193EVM-001 Switching Waveforms (V

= 8V, I

OUT

= 10A) ......................... 139 TPS40193EVM-001 Switching Waveforms (V

= 14V, I

OUT

= 10A) ....................... 1310 TPS40193EVM-001 Gain and Phase vs Frequency ......................................... 1411 TPS40193EVM-001 Gain and Phase vs Frequency ......................................... 1412 TPS40193EVM-001 Component Placement .................................................. 1513 TPS40193EVM-001 Silkscreen ................................................................. 1514 TPS40193EVM-001 Top Copper Layer ........................................................ 1615 TPS40193EVM-001 Bottom Copper Layer ................................................... 1616 TPS40193EVM-001 Internal Layer 1 ........................................................... 1717 TPS40193EVM-001 Internal Layer 2 ........................................................... 17

List of Tables

1 TPS40193EVM-001 Electrical and Performance Specifications ............................. 32 Adjusting V

OUT

with R7 ............................................................................. 53 Adjusting V

SCP

with R9 ............................................................................. 54 Test Point Descriptions ............................................................................ 65 Bill of Materials .................................................................................... 18

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1 Introduction

1.1 Description

1.2 Applications

1.3 Features

Introduction

The TPS40193EVM-001 evaluation module (EVM) is a synchronous buck converter that provides a fixed1.8V output at up to 10A from a 12V input bus. The EVM is designed to power up from a single supply, sono additional bias voltage is required for start-up. The demonstration module uses the TPS40193 reducedpin count mid-voltage synchronous buck controller.

The TPS40193EVM-001 is designed to use a regulated 12V (8V–14V) bus to produce a regulated 1.8Voutput at up to 10A of load current. The EVM is designed to demonstrate the capabilities of the TPS40193in a typical 12V bus to low-voltage application while providing a number of test points for evaluating theTPS40193 in a given application. The EVM can be modified to support output voltages from 0.9V to 3.3Vby changing a single set resistor.

•Non-isolated medium current point-of-load and low voltage bus converters•Networking equipment•Telecommunications equipment•Computer peripherals•Digital set-top box

•8V–14V input range•1.8V fixed output, adjustable with single resistor•10A dc steady state output current•300kHz switching frequency (fixed by TPS40193)•Single SO-8 MOSFETs for both main switch and synchronous rectifier•Double-sided, two active layer printed circuit board (PCB) with all components on top side– Test point signals routed on internal layers•Active converter area of less than 1.2in

(<1.54in ×0.76in)•Convenient test points for probing switching waveforms and non-invasive loop response testing

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2 TPS40193EVM-001 Electrical Performance Specifications

TPS40193EVM-001 Electrical Performance Specifications

Table 1 summarizes the electrical specifications of the TPS40193EVM-001.

Table 1. TPS40193EVM-001 Electrical and Performance Specifications

PARAMETER SYMBOL CONDITIONS MIN NOM MAX UNITS

Input Characteristics

Input Voltage V

8 12 14 VInput Current I

= Min, I

OUT

= Max 2.7 2.85 ANo Load Input Current V

= Min, I

OUT

= 0A 48 60 mAInput UVLO V

IN_UVLO

OUT

= Min to Max 3.9 4.2 4.4 VInput OV V

IN_OV

OUT

= Min to Max N/A V

Output Characteristics

Output Voltage V

OUT

= NOM, I

OUT

= NOM 1.86 1.8 1.84 VLine Regulation V

= Min to Max, I

OUT

= NOM 0.5 %Load Regulation V

= NOM, I

OUT

= Min to Max 0.5 %Output Voltage Ripple V

OUT_Ripple

= NOM, I

OUT

= MAX 40 mV

Output Current I

OUT

= Min to Max 0 6 10 AOutput Over Current

OCP

= NOM, V

OUT

= (V

OUT

– 5%) 19 AInception PointOutput OVP V

OVP

OUT

= Min to Max N/A VTransient Response

Load Step ∆I 0.75 x I

OUT_Max

to 0.25 ×I

OUT _Max

5 ALoad Slew Rate 5 A/ µsOvershoot 50 mVSettling Time ms

System Characteristics

Switching Frequency F

250 300 350 kHzPeak Efficiency η

= NOM, I

OUT

= Min to Max 95 %Full Load Efficiency ηV

= NOM, I

OUT

= Max 92 %Operating Temperature

= Min to Max, I

OUT

= Min to Max –40 +25 +60 °CRange

Mechanical

Characteristics

W Width 1.54 inDimensions

(Active Area)

L Length 0.76 in

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3 Schematic

Schematic

Figure 1 shows the schematic for this EVM. See Table 5 , the Bill of Materials, for specific values.

Figure 1. TPS40193EVM-001 Schematic

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4 General Configuration and Description

4.1 Adjusting Output Voltage (R7)

V = V

VOUT VREF ´R + R

8 7

(1)

4.2 Adjusting Short-Circuit Protection (R9)

General Configuration and Description

This section reviews the general configurations for using the TPS40193EVM-001.

The regulated output voltage can be adjusted within a limited range by changing the ground resistor in thefeedback resistor divider (R7). The output voltage is given by the formula shown in Equation 1 :

where:

•V

VREF

= 0.591V and•R

= 20k Ω

Table 2 contains common values for R7 to generate popular output voltages. The TPS40193EVM-001 isstable through these output voltages, but efficiency may suffer because the power stage is optimized for1.8V output.

Table 2. Adjusting V

OUT

with R7

OUT

R7 (k Ω)

3.3V 4.322.5V 6.192.25V 7.152.0V 8.251.8V 9.761.5V 13.01.2V 19.11.0V 28.70.9V 38.3

The values in Table 2 provide less than 1% nominal set-point error in the output voltage. If a tighternominal value is required, R5 can be used in parallel with R7 to obtain a wider range of resistor values,using commonly-available E96 resistors.

The TPS40193 uses a selectable current limit for short-circuit protection. The current limit is selected fromthree predefined levels by placing a resistor at R9. The TPS40193 compares the voltage drop across thehigh-side FET (VDD to SW) to an internal reference voltage selected during start-up. Table 3 shows thevoltage levels.

Table 3. Adjusting V

SCP

with R9

SCP

(min) R7 (k Ω)

88mV 3.9160mV Open228mV 12

The current before declaring short-circuit protection can be determined by dividing the V

SCP

by the R

DS(ON)of the high-side FET (Q2)

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4.3 Disable Jumper (JP1)

Placing the JP1 shunt in the Left Position

Dis En

JP 1

drives the Q1 FET to pull the TPS40193 EN pin low,

disabling the controller. Removing the JP1 shunt or installing it in the Right Position

Dis En

JP 1

shorts the Q1

4.4 Test Point Descriptions

4.4.1 Input Voltage Monitoring (TP1, TP2)

General Configuration and Description

The TPS40193EVM-001 provides a three-pin, 100mil (0.100in) header and shunt for testing theTPS40193 disable function.

gate to ground and enables the TPS40193EVM-001 output.

Table 4 describes the TPS40196EVM-001 test points and identifies the respective sections of this userguide that discuss each test point.

Table 4. Test Point Descriptions

Test Point Label Use/Function Section

TP1 V

IN+

Monitor input voltage to the module

Section 4.4.1TP2 V

IN–

Monitor input voltage to the moduleTP3 Power-Good Power-Good output voltageTP4 Ext Source External source for Power-Good circuit

Section 4.4.2Ground for external source forTP5 GND

Power-Good

Section 4.4.3 ,TP6 COMP Monitor COMP voltage

Section 4.4.5Ground for SW, LDRV and HDRVTP7 GND

measurementsTP8 HDRV Monitor high-side gate drive (Q2)

Section 4.4.4TP9 SW Monitor switch node waveformsTP10 LDRV Monitor low-side gate drive (Q3)TP11 GND Ground for Loop Monitoring ProbeLoop injection point and injectionTP12 CH1

monitoring point

Section 4.4.5Loop injection point and outputTP13 CH2

response monitoring pointTP14 GND Ground for Loop Monitoring ProbeTP15 V

OUT+

Monitor output voltage from the module

Section 4.4.6TP16 V

OUT–

Monitor output voltage from the moduleInjection point to test pre-bias loadTP17 Pre-Bias Section 4.4.7compliance

The TPS40193EVM-001 provides two test points for measuring the voltage applied to the module. Thesetest points allow the user to measure the actual module voltage without losses from input cables andconnector losses. All input voltage measurements should be made between TP1 and TP2. To use TP1and TP2, connect a voltmeter positive terminal to TP1 and negative terminal to TP2.

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4.4.2 Power-Good (TP3, TP4, TP5)

4.4.3 Compensation and Initialization (TP6)

4.4.4 Switching Waveforms (TP7, TP8, TP9, TP10)

4.4.5 Loop Analysis (TP11, TP12, TP13, TP14)

4.4.6 Output Voltage and Monitoring (TP15, TP16)

4.4.7 Pre-Bias Input (TP17)

General Configuration and Description

The TPS40193EVM-001 has three test points to allow the user to evaluate the TPS40193 Power-Goodfunction. TP4 provides access to the Power-Good output of the TPS40193. It has a 100k Ωpull-up resistorto the TPS40193 5V regulator, and can be used as a logic signal with no additional requirements. TP3provides a connection for an external power-good source for 3.3V logic. TP3 is connected to thepower-good circuit through a 10k Ωpull-up resistor. TP5 provides a local ground access to connect aremote disable circuit.

The TPS40193EVM-001 also provides a test point connection to the COMP pin of the TPS40193controller. This test point can be used to monitor the COMP voltage during the controller Power OnInitialization that sets the controller short-circuit protection (SCP) threshold. The test point can also beused to monitor the pulse-width modulator (PWM) comparator input voltage (COMP) during operation, orused to measure the Power Stage Gain by following the Loop Analysis directions but moving Channel Aprobe from TP12 to TP6.

The TPS40193EVM-001 has three test points and a local ground connection (TP7) to monitor the mainswitching waveforms. Connect an oscilloscope probe to TP8 to monitor the high-side gate drive applied tothe gate of Q2. Connect an oscilloscope probe to TP9 to monitor the switch node voltage. Thegate-to-source voltage (V

) of the high-side FET can be determined by a math function TP8—TP9 if bothchannels use the same scale. Connect an oscilloscope probe to TP9 to monitor the low-side gate driveapplied to the gate of Q3. Because the source of Q3 is connected directly to ground, no math function isrequired to determine the gate-to-source voltage of the low-side FET.

The TPS40193EVM-001 contains a 49.9 Ωseries resistor (R14) in the feedback loop to allow for matchedimpedance signal injection into the feedback for loop response analysis. An isolation transformer shouldbe used to apply a small (30mV or less) signal across R14 through TP12 and TP13. By monitoring the acinjection level at TP13 and the returned ac level at TP14, the power-supply loop response can bedetermined. Moving Channel A from TP12 to TP6 (COMP) the control-to-output response of the powerstage (also referred to as the power stage transfer function) can be directly measured. See Section 3.9xxfor a detailed procedure to perform loop response measurements.

There are two test points on the TPS40193EVM-001 for measuring the voltage generated by the module.These test points allow the user to measure the actual module output voltage without losses from outputcables and connector losses. All output voltage measurements should be made between TP15 and TP16.To use TP1 and TP2, connect a voltmeter positive terminal to TP15 and negative terminal to TP16. Foroutput ripple measurements, TP15 and TP16 allow a user to limit the ground loop area by using the tipand barrel measurement technique shown in Figure 3xx. (All output ripple measurements should be madeusing this method of measurement.)

The TPS40193EVM-001 contains a pre-bias injection circuit with 100 Ωresistor and series diode to allowtesting and evaluation of the TPS40193 pre-bias support compatibility. Apply a voltage less than the targetoutput voltage to TP17. Monitoring the output voltage during start-up demonstrates the ability of theTPS40193 to power up without drawing current from a pre-biased output. D2 prevents the output voltagefrom back-driving the pre-bias source.

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5 Test Setup

5.1 Equipment

5.1.1 Voltage Source

5.1.2 Meters

5.1.3 Loads

5.1.4 Oscilloscope

5.1.5 Recommended Wire Gauge

5.1.6 Other

Test Setup

:The input voltage source (V

) should be a 0V–15V variable dc source capable of 5A

. Connect V

INto J1 as shown in Figure 2 .

A1: 0A

–5A

, ammeter

V1: V

, 0V–15V voltmeter

V2: V

OUT

0V–5V voltmeter

LOAD1: The output load (LOAD1) should be an electronic constant current mode load capable of0A

–10A

at 1.8V.

Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on V

OUT

. Theoscilloscope should be set for 1M Ωimpedance, 20MHz bandwidth, ac coupling, 1 µs/division horizontalresolution, and 10mV/division vertical resolution for taking output ripple measurements. TP15 and TP16can be used to measure the output ripple voltage by placing the oscilloscope probe tip through TP15 andholding the ground barrel to TP16, as shown in Figure 3 . For a hands-free approach, the loop in TP16 canbe cut and opened to cradle the probe barrel. Using a leaded ground connection may induce additionalnoise because of the large ground loop area.

to J1: The connection between the source voltage, V

, and J1 of HPA238 can carry as much as5A

. The minimum recommended wire size is AWG #16 with the total length of wire less than four feet(two feet input, two feet return max recommended).

J2 to LOAD1 (Power): The power connection between J2 of HPA238 and LOAD1 can carry as much as10A

. The minimum recommended wire size is 2x AWG #16, with the total length of wire less than twofeet (one foot output, one foot return max recommended).

Fan: This evaluation module includes components that can become hot to the touch. Because this EVM isnot enclosed (to allow probing of circuit nodes), a small fan capable of 200lfm–400lfm is required toreduce component surface temperatures to prevent user injury.

CAUTION

The EVM should not be left unattended while powered.

WARNINGThe EVM should not be probed while the fan is not running.

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5.2 Equipment Setup

LOAD1

1.8V @

10A

FAN

TP17

TEXAS INSTRUMENTS

TPS40193EVM-001

12V to 1.8V @ 10A

HPA238

TP16

TP15

Pre-Bias

See Tip and Barrel

Measurement for

Vout ripple

VIN

TP7 TP9 TP10 TP8

TP12 TP11 TP13 TP14

GND LDRVSW HDRV

CH1 GND CH2 GND

TP2

TP1

Oscilloscope

1MW, AC

20mV / div

20MHz

Dis

TP6

COMP

TP5

TP4

TP3

External Source

GND

PGOOD

JP 1

TP16TP15

Probe Tip

Metal Ground Barrier

Tip and Barrel V

ripple measurement

OUT

Test Setup

Figure 2 through Figure 4 show the basic test setup recommended to evaluate the TPS40193EVM-001.Please note that although the return for J1 and J2 are the same, the connections should remain separate,as shown in Figure 2 .

Figure 2. TPS40193EVM-001 Recommended Test Setup

Figure 3. TPS40193EVM-001 Output Ripple Measurement—Tip and Barrel Using TP15 and TP16

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Network

Analyzer

Isolation

Transformer LOAD1

1.8V @

10A

FAN

TP17

TEXAS INSTRUMENTS

TPS40193EVM-001

12V to 1.8V @ 10A

HPA238

TP16

TP15

Pre-Bias

See Tip and Barrel

Measurement for

Vout ripple

VIN

TP7 TP9 TP10 TP8

TP12 TP11 TP13 TP14

GND LDRVSW HDRV

CH1 GND CH2 GND

TP2

TP1

Oscilloscope

1MW, AC

20mV / div

20MHz

Dis

TP6

COMP

TP5

TP4

TP3

External Source

GND

PGOOD

JP 1

5.3 Start-up/Shutdown Procedure

5.4 Output Ripple Voltage Measurement Procedure

Test Setup

Figure 4. TPS40193EVM-001 Control Loop Measurement Setup

Follow these steps to start up and shut down the TPS40193EVM-001.Step 1. Increase V

from 0V to 12V

.Step 2. Vary LOAD1 from 0A

to 10A

.Step 3. Vary V

from 8.0V

to 14V

.Step 4. Decrease V

to 0V

.Step 5. Decrease LOAD1 to 0A.

Follow these steps to measure the output ripple voltage on the TPS40193EVM-001.Step 1. Increase V

from 0V to 12V

.Step 2. Adjust LOAD1 to desired load between 0A

and 10A

.Step 3. Adjust V

to desired load between 8.0V

and 14V

.Step 4. Connect oscilloscope probe to TP15 and TP16 as shown in Figure 3 .Step 5. Measure output ripple.Step 6. Decrease V

to 0V

.Step 7. Decrease LOAD1 to 0A.

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