TPS61182EVM-259 - Texas Instruments

User's Guide

SLVU223B–February 2008–Revised May 2011

TPS61181EVM-259 / TPS61182EVM-259

This user's guide describes the characteristics, operation, and use of the TPS6118xEVM-259 evaluation

module (EVM). This EVM contains either Texas Instruments' TPS61181 (-001 build) or TPS61182 (-002

build) or TPS61181A (-003 build)-based WLED power solutions, each of which provides up to six

independently regulated current outputs using a single inductor step-up (boost) converter. The current

outputs are ideal for driving a WLED backlight in notebook/laptop computers. A separate EVM,

WLEDEVM-260, contains eight strings of 10 series WLEDs and connects to the TPS6118x EVMs via a

14-pin ribbon cable to simplify evaluation. This user's guide includes EVM specifications, recommended

test setup, test results, bill of materials, and a schematic diagram for the TPS61181/2/1AEVM.

Contents

1 Introduction .................................................................................................................. 2

2 Input/Output Connector Descriptions ..................................................................................... 3

3 Board Layout ................................................................................................................ 7

4 Schematic and Bill of Materials ........................................................................................... 9

List of Figures

1 Efficiency vs Total WLED Output Current .............................................................................. 4

2 Dimming Linearity........................................................................................................... 4

3 Start-up....................................................................................................................... 5

4 Switching Waveform........................................................................................................ 5

5 Output Ripple at PWM Dimming with CO= 4.7 μF...................................................................... 6

6 Top Assembly Layer........................................................................................................ 7

7 Top Layer .................................................................................................................... 7

8 Bottom Layer ................................................................................................................ 8

9 HPA259A Schematic ....................................................................................................... 9

List of Tables

1 Typical Performance Specification Summary ........................................................................... 2

2 HPA259 Bill of Materials.................................................................................................. 10

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

Introduction

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1 Introduction

This EVM contains either Texas Instruments' TPS61181 (-001 build) or TPS61182 (-002 build) or

TPS61181A (-003 build) based WLED power solution, each of which provides up to six independently

regulated current outputs using a single inductor step-up (boost) converter. The current outputs are ideal

for driving a WLED backlight in notebook/laptop computers. A separate EVM, WLEDEVM-260 (SLVU238),

contains six strings of 12 series WLEDs and connects to the TPS6118xEVM via a 14-pin ribbon cable to

simplify evaluation. The goal of these EVMs is to facilitate evaluation of the TPS6118x integrated circuit

(IC) in a typical WLED application.

1.1 Performance Specification Summary

Table 1 provides a summary of the TPS6118xEVM-259 performance specifications. All specifications are

given for an ambient temperature of 25°C.

Table 1. Typical Performance Specification Summary

CONDITION MIN TYP MAX UNITS

VBAT supply TPS61181, TPS61182 5 24 V

VBAT supply TPS61181A 4.5 24 V

EN logic high TPS61181, TPS61182 1.2 6 V

EN logic high TPS61181A 2.0 18 V

J8 connected to 10 WLED configured WLEDEVM-260, JP13 shorted, JPFBxS 30 35 V

open, VBAT supplied, EN = 3.3V, DCTRL = VCC

V(TP5) J8 connected to 10 WLED configured WLEDEVM-260, JP13 open, JPFBxS 38 39 40

open, VBAT supplied, EN = 3.3V, DCTRL = VCC

J8 connected to 10 WLED configured WLEDEVM-260, JP13 shorted, JPFBxS mA

I(JP13) = 6 X IFBx 116 120 124

open, VBAT = 5 V, VCC supplied, EN = 3.3V, DCTRL = VCC

1.2 Modifications

To aid user customization of the EVM, the board was designed with devices having 0603 or larger

footprints. A real implementation likely occupies less total board space.

Changing components can improve or degrade EVM performance. For example, using inductors with

larger dc resistances lowers efficiency of the solution.

Transistor Q1, resistor R3, and diode D2 are optional but are recommended components. Transistor Q1

and resistor R3 provide input to output isolation when the IC is disabled and in the event of a fault. Diode

D2 clamps inductor L1 to 0.3 V when Q1 opens in order to protect Q1 from overvoltage.

2TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011

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Input/Output Connector Descriptions

2 Input/Output Connector Descriptions

2.1 Input/Output Connections

The connection points are described in the following paragraphs.

2.1.1 J1 - VIN

This header is the positive connection to the input power supply. Twist the leads to the input supply and

keep them as short as possible.

2.1.2 J2 - GND

This header is the return connection to the input power supply.

2.1.3 J3 - EN

This header connects to the IC's EN pin and must be taken logic high (above 1.2 V but no higher than 7

V) to enable the IC. Removing the logic high signal allows the internal pulldown resistor to pull EN to

ground, which disables the IC.

2.1.4 J4 - CIN/VCC

For the TPS61181 and TPS61182 IC, this header provides a measurement point for the internal LDO that

outputs 3.3 V on the CIN pin. For the TPS61180, an external 3.3-V supply must be applied to this pin in

order for the IC to operate.

2.1.5 J5 - GND

This header connects to the board's ground plane.

2.1.6 J6 - GND

This header connects to the board's ground plane.

2.1.7 J7 - GND

This header connects to the board's ground plane.

2.1.8 J8 - 14-pin Connector

This header provides connections to the boost converter output (VOUT) and each of the six current

feedback lines (IFBx). With a 14-pin ribbon cable, this header can be connected to WLEDEVM-260,

containing six strings of 12 LEDs, to facilitate evaluation.

2.1.9 JP1-DCTRL

Installing this jumper ties the DCTRL dimming control pin to VCC, thereby providing 100% WLED dimming

or GND, thereby effectively disabling the internal current regulators. Removing the jumper allows the

internal pulldown resistor to pull DCTRL to ground, which also effectively disables the internal current

regulators.

2.1.10 JFB1S-JFB6S

Installing any of these jumpers shorts the corresponding internal current regulator to ground. These

jumpers are intended to assist in testing the TPS61181 and TPS61182's ability to protect itself from a

WLED string accidentally shorting to ground.

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

100

0 20 40 60 80 100 120

I -OutputCurrent-mA

Efficiency-%

V =19V

V =11V

IN V =7V

100

0 20 40 60 80 100 120

I -OutputCurrent-mA

Efficiency-%

V =19V,

V =11V,

V =7V

Input/Output Connector Descriptions

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2.1.11 JFB1R-JFB6R

These jumpers and the corresponding series resistors are not used in testing the TPS61181 or

TPS61182.

2.2 Test Setup

Connect a power supply capable of supplying up to 24 V at 1.5 A is required between the VBAT pin and

GND (J1 and J2). Connect a second logic signal or power supply capable of providing 1.2 V - 7 V to the

high-impedance EN pin (J3) referenced to the same ground on J2. For normal operation, JP13 should be

shorted with a jumper or ammeter and multiple WLEDs connected to one or more of the IFBx lines. J8

provides a convenient connection to WLEDEVM-260 (SLVU238) via a 14-pin ribbon, which contains six

strings of 12 WLEDs each. Alternatively, external WLEDs can be connected to J2 or between jumpers

JFB1S - JFB6S. If fewer than six WLEDs are needed, simply leave the unused IFBx line unconnected or

short it to ground. By shorting jumpers JFB1S - JFB6S, the user can test the IC's protection against short

circuits.

The TPS6118x family implements WLED dimming by replicating the PWM signal applied to DCTRL pin to

the IFBx internal current regulators. A function generator capable of providing 1.2-V to 6-V maximum

amplitude PWM signal between 100 Hz to 1 kHz is required to implement dimming, avoid screen

flickering, and maintain dimming linearity.

2.3 Test Results

Below are the test results at TA= 25°C using this EVM:

Figure 1. Efficiency vs Total WLED Output Current Figure 2. Dimming Linearity

4TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011

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IWLED

V =11V,

I =20mAx6=120mA

t-Time-10ms/div

2V/div

10V/div

500mA/div

50mA/div

Vbat

VO AC

20V/div

t-Time-1 s/divm

V =11V,

I =20mAx6=120mA

100mVac/div

1 A/div

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Input/Output Connector Descriptions

Figure 3. Start-up

Figure 4. Switching Waveform

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

DCTRL

VO AC

1 A/div

t-Time-500 s/divm

V =11V,

I =20mAx6=120mA,

PWMFreq=500Hz,

Duty=50%

100mVac/div

5V/div

Input/Output Connector Descriptions

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Figure 5. Output Ripple at PWM Dimming with CO= 4.7 μF

Note that when measuring the WLED output voltage for the efficiency computation, the output voltage

from the IC's IOUT pin to ground was used, which includes the voltage drop across the series ammeter,

used to measure the WLED current, as well as the voltage drop across the internal current sink circuit and

external current setting resistor.

6TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011

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Board Layout

3 Board Layout

Board layout is critical for all switch mode power supplies. Figure 6,Figure 7, and Figure 8 show the board

layout for the HPA283 PCB. The switching nodes with high-frequency noise are isolated from the

noise-sensitive feedback circuitry, and careful attention has been given to the routing of high-frequency

current loops. See the data sheet for more specific layout guidelines.

Figure 6. Top Assembly Layer

Figure 7. Top Layer

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

Board Layout

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Figure 8. Bottom Layer

8TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011

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Schematic and Bill of Materials

4 Schematic and Bill of Materials

Figure 9. HPA259A Schematic

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

Schematic and Bill of Materials

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4.1 Bill of Materials

Table 2. HPA259 Bill of Materials

-001 -002 -003 RefDes VALUE Description Size Part Number

1 1 1 C1 4.7uF Capacitor, Ceramic, 25V, X5R, 10% 1206 C1206C475K3PAC

0 0 0 C1A Open Capacitor, Ceramic, 25V, X5R, 10% 0805 Std

1 1 1 C2 4.7uF Capacitor, Ceramic, 50V, X7R, 10% 1210 GRM32ER71H475KA88L

0 0 0 C2A Open Capacitor, Ceramic, 50V, X5R, 10% 0805 Std

1 1 1 C3 1.0uF Capacitor, Ceramic, 25V, X5R, 10% 0603 GRM188R61E105KA12D

1 1 1 C4 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 0603 C1608X7R1H104K

0 0 0 C5 Open Capacitor, Ceramic, 50V, X7R, +/-15% 0402 Std

1 1 1 D1 BAT54ZFILM Diode, Schottky, 300-mA, 40-V SOD123 BAT54ZFILM

1 1 1 D2 SS2P5-E3/84A Diode, High Current SMD Schottky Rectifier, DO-220AA SS2P5-M3/84A or alt.

2A, 50VDC SS2P6-M3/84A or alt.

SS2P5-E3/84A or alt.

SS2P6-E3/84A See note 5

6 6 6 J1, J2, J3, J4, J5, J6 PEC02SAAN Header, Male 2 pin, 100mil spacing 0.100 inch x 2 PEC02SAAN

1 1 1 J7 PEC04SAAN Header, Male 4 pin, 100mil spacing 0.100 inch x 4 PEC04SAAN

1 1 1 J8 N2514-6002-RB Connector, Male Straight 2x7 pin, 100mil 0.100 inch x 2X7 N2514-6002-RB

spacing, 4 Wall

0 0 0 JFB1R1, JFB2R1, Open Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN

JFB3R1, JFB4R1,

JFB5R1, JFB6R1

6 6 6 JFB1S1, JFB2S1, PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN

JFB3S1, JFB4S1,

JFB5S1, JFB6S1

1 1 1 JP1 PEC03SAAN Header, 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN

1 1 1 JP13 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN

1 1 1 L1 10uH 10 uH Inductor, 75 ohm [90 ohm] DC 0.205 x 0.205 inch A915AY-100M

resistance, ±20%

1 1 1 Q1 Si2307BDS MOSFET, P-ch, -30V, -2A, 140 milliohms SOT23 Si2307BDS ALTERNATE:

ALTERNATE: NTR4171P

NTR4171P

1 1 1 R1 62K Resistor, Chip, 1/16W, 1% 0603 Std

1 1 1 R10 0 Resistor, Chip, 1/16W, 1% 0603 Std

1 1 1 R2 51.1 Resistor, Chip, 1/16W, 1% 0603 Std

1 1 1 R3 100k Resistor, Chip, 1/16W, 1% 0603 Std

0 0 0 R4, R5, R6, R7, R8, Open Resistor, Chip, 1/16W, 1% 0603 Std

R9, R11

10 TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011

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Schematic and Bill of Materials

Table 2. HPA259 Bill of Materials (continued)

5 5 5 TP1, TP2, TP3, TP4, 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000

TP5

1 0 0 U1 TPS61181RTE IC, WLED Driver QFN-16 TPS61181RTE

0 1 0 U1 TPS61182RTE IC, WLED Driver QFN-16 TPS61182RTE

0 0 1 U1 TPS61181ARTE IC, WLED Driver QFN-16 TPS61181ARTE

111–Label (See Note 6) 1.25 x 0.25 inch THT-13-457-10

888–Shunt, 100 mil, Black 0.1 929950-00

111–PCB, 3.25 In x 1.75 In x 0.062 In HPA259

SLVU223B–February 2008–Revised May 2011 TPS61181EVM-259 / TPS61182EVM-259

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EVM Warnings and Restrictions

It is important to operate this EVM within the input voltage range of 5V to 24V and the output voltage range of VIN to 17.4V .

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are

questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the

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specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 25°C. The EVM is designed to

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devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near

these devices during operation, please be aware that these devices may be very warm to the touch.

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