Texas Instruments LM5160A User manual

LM5160A, LM5160 Buck EVM User's Guide

User's Guide

Literature Number: SNVU441B

October 2014–Revised April 2015

Contents

1 Introduction......................................................................................................................... 4

2 Background......................................................................................................................... 4

3 Setup.................................................................................................................................. 4

3.1 Input/Output Connector Description ................................................................................... 4

3.2 Operation.................................................................................................................. 4

3.3 FPWM Mode Selection.................................................................................................. 5

4 Board Layout....................................................................................................................... 5

5 Schematic........................................................................................................................... 6

6 LM5160DNTBKEVM Bill of Materials for 300 kHz Configuration ................................................. 7

7 Performance Curves with LM5160A, LM5160........................................................................... 7

Revision History.......................................................................................................................... 10

2Table of Contents SNVU441B–October 2014–Revised April 2015

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List of Figures

1 EVM Component View with LM5160A ................................................................................... 5

2 EVM Top Copper View with LM5160A ................................................................................... 5

3 EVM Bottom Copper View with LM5160A ............................................................................... 5

4 EVM Top Solder Mask with LM5160A ................................................................................... 5

5 Buck EVM Schematic with LM5160....................................................................................... 6

6 Load Regulation.............................................................................................................. 7

7 Efficiency vs. IOUT............................................................................................................. 7

8 Efficiency vs. VIN ............................................................................................................. 7

9 Efficiency DCM vs. CCM at 300kHz....................................................................................... 7

10 VIN = 48V and FPWM = 0 at no load ..................................................................................... 7

11 VIN = 48V and FPWM = 0 at no load (Zoomed) ......................................................................... 7

12 VIN = 48V and FPWM = 1 at no load ..................................................................................... 8

13 Load Transient (IO= 300mA to 1.5A)...................................................................................... 8

14 Startup at RLOAD = 3Ω........................................................................................................ 8

15 Pre-Bias Startup at RLOAD = 3Ωand VIN = 48V ........................................................................... 8

16 EN/UVLO Startup at RLOAD = 5Ωand VIN = 24V.......................................................................... 8

17 EN/UVLO Startup at RLOAD = 100Ωand VIN = 24V....................................................................... 8

18 Output Short-Circuit at VIN = 48V .......................................................................................... 9

List of Tables

1 Board Specification.......................................................................................................... 4

2 FPWM Pin Mode............................................................................................................. 5

SNVU441B–October 2014–Revised April 2015 List of Figures

User's Guide

SNVU441B–October 2014–Revised April 2015

LM5160A, LM5160 User’s Guide

1 Introduction

The Texas Instruments LM5160DNTBKEVM evaluation module (EVM) helps designers evaluate the

operation and performance of the LM5160A / LM5160 synchronous buck regulator IC in a synchronous

Buck configuration. It also includes the specification for the board, complete application schematic, bill of

materials (BOM), setup instructions, and typical performance curves.

2 Background

The LM5160DNTBKEVM evaluation board provides a fully functional buck regulator, employing the

constant on-time (COT) operating principle. This evaluation board provides a 5-V output over an input

voltage range of 10 V to 60 V. The circuit delivers load current up to 1.5 A. The application schematic is

setup up to operate from a 24 V nominal bus. The nominal switching frequency is approximately 300 kHz.

The LM5160 device name is used generically throughout this document and represents both the LM5160

and LM5160A unless stated otherwise. The only difference between the two is the ability to connect an

external voltage source to the VCC pin of the LM5160A. The board is designed to demonstrate a small

buck solution size for low power wide VIN applications.

Table 1. Board Specification

EVM INPUT VOUT IOUT

LM5160DNTBKEVM VIN=10V–60V 5V 0–1.5A

3 Setup

This section describes the connectors, the test points and the jumper on the EVM as well as how to

properly connect and use the LM5160DNTBKEVM with the LM5160, unless stated otherwise.

3.1 Input/Output Connector Description

J1 – Input is the power input terminal for the converter. The terminal block provides an input VIN (+) and

ground (-) connection to allow the user to attach the EVM to a power supply.

J2 – Output is the regulated output voltage for the converter. The terminal block provides a VOUT (+) and

ground (-) connection to allow the user to attach the EVM to a load.

TP1 – (EN) allows the user to remotely shutdown/startup LM5160 while operating in the buck mode. EN

circuitry is not populated on EVM.

TP2 – (SW) allows the user to connect a scope probe to observe the switch node of the converter.

JP1 –Mode pin allows the user to select between the forced CCM and the DCM operation.

3.2 Operation

For proper operation of the LM5160 Buck converter, the input voltage applied across J1 should be

gradually increased. The load on the output (J2) should not exceed 1.5 A. The inductor L1 utilized in this

board is optimized for small solution size. The saturation current rating (ISAT) of the inductor should be

higher than the LM5160 integrated high side FET peak current-limit threshold of 2.875 A (max.).

The nominal switching frequency can be set using the RON (R3 in the EVM) resistor as shown by

Equation 1:

4LM5160A, LM5160 User’s Guide SNVU441B–October 2014–Revised April 2015

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UV2

IN,UVLO(rising) UVLO(TH) UV1

V V 1 R

§ ·



¨ ¸

IN(HYS) UVLO(HYS) UV2

V I Ru

OUT

FB2

FB1 REF

R V



OUT

sw 10

F Hz

R 1 10

u u

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Setup

(1)

The output voltage is set by using the feedback divider resistors R7 (RFB1) and R6 (RFB2) in the EVM by

using Equation 2:

(2)

The EN/UVLO resistors R2 (RUV1) and R1 (RUV2) in the EVM set the input under-voltage lockout threshold

and hysteresis according to Equation 3:

(3)

and,

(4)

3.3 FPWM Mode Selection

Use the FPWM pin to select between the continuous conduction mode (CCM) and the discontinuous

conduction mode (DCM) of operation. Table 1 summarizes the LM5160NDTBKEVM Jumper (JP1) settings

that are chosen to activate the desired mode of operation. Refer to the LM5160 datasheet (SNVSA03A)

for more detailed information regarding the FPWM mode selection.

Table 2. FPWM Pin Mode

JP1 Shunt Setting Logic Stage Description

The FPWM pin is grounded or left floating. DCM

DCM or Floating (High Z) 0 enabled at light loads.

The FPWM pin is connected to VCC. Enables CCM at

FPWM (VCC) 1 light loads.

4 Board Layout

Figure 1. EVM Component View with LM5160A Figure 2. EVM Top Copper View with LM5160A

SNVU441B–October 2014–Revised April 2015 LM5160A, LM5160 User’s Guide

2.2μF

C10

0.47μF

TP1

DNP

127k

18.2k

169k

DNP

JP1

0.022uF

0.01μF

DNP

3.01k

2.00k

0.47

10μF

TP2

DNP

GND

GND GND

GND

GND GND

1 Fμ

DNP

VIN 10 - 60VDC

VOUT 5VDC @ 1.5A

AGND

PGND

VIN

EN/UVLO

RON

6FPWM 7

FB 8

VCC 9

BST 10

SW 11

SW 12

PAD

LM5160DNT

47uH

GND

Schematic

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Figure 3. EVM Bottom Copper View with LM5160A Figure 4. EVM Top Solder Mask with LM5160A

Figure 1 to Figure 4 show the board layout for the LM5160DNTBKEVM PCB. The WSON-12 package

allows a compact leadless IC package buck regulator solution. The LM5160DNTBKEVM is a simple two

layer board. In this EVM, the necessary feedback ripple voltage ( VFB ) required for stable COT operation

over the entire input voltage range is generated by the inductor current flowing through the resistor, RESR

(R8 as shown in Figure 1). This is the least component, minimum cost ripple configuration. There are

placeholders in the EVM ( R7, C6, and C7) which can be populated as required, for the minimum ripple

injection network. If this external ripple configuration is used, substitute R8 with a 0Ω(0805) resistor.

Calculate these component values based on the formulae mentioned under Type 3 ripple configuration in

the LM5160, LM5160A Datasheet (SNVSA03A). See application note AN-1481 for more details for each

ripple generation method.

5 Schematic

Figure 5. Buck EVM Schematic with LM5160

When/If used with LM5160, the placeholder for D1 as in Figure 1, must remain unpopulated under all

cases. When evaluating the LM5160A, the designer needs to use the same standard EVM by replacing

the LM5160 IC (when/if populated) with the LM5160A. No other components on board need to be

replaced or removed. With LM5160A IC, the designer can use other nominal output voltage (VOUT), set

between 9 V and 13 V, to externally drive the VCC for improved efficiency requirement. In that case, the

diode in placeholder D1 can be appropriately populated, to the correct voltage ratings. More detail is given

in Section 6 in the Bill of Materials. For more information about the difference between LM5160A and

LM5160, please refer to the LM5160 Datasheet (SNVSA03A).

6LM5160A, LM5160 User’s Guide SNVU441B–October 2014–Revised April 2015

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4.975

4.985

4.995

5.005

5.015

5.025

0.00 0.25 0.50 0.75 1.00 1.25 1.50

Output Voltage (V)

Load Current (A)

Vin = 12V

Vin = 24V

Vin = 48V

C002

100

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75

Efficiency (%)

Load Current (A)

Vin = 12V

Vin = 24V

Vin = 48V

C001

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LM5160DNTBKEVM Bill of Materials for 300 kHz Configuration

6 LM5160DNTBKEVM Bill of Materials for 300 kHz Configuration

ITEM DESCRIPTION MFG. PART NUMBER PACKAGE VALUE

C1, C10 Ceramic Capacitor Murata GRM32ER72A225KA35L 1210 2.2µF, 100V, ±10%, X7R

C2 Ceramic Capacitor Murata GRM21BR72A474KA73L 0805 0.47µF, 100V, ±10%, X7R

C3 Ceramic Capacitor Murata GRM188R71C223KA01D 0603 0.022µF, 16V, ±10%, X7R

C4 Ceramic Capacitor Murata GRM188R71C103KA01D 0603 0.01µF, 16V, ±10%, X7R

C5 Ceramic Capacitor Murata GRM188R71E105KA12D 0603 1µF, 25V, ±10%, X7R

C8, C9 Ceramic Capacitor Murata GRM21BR71A106KE51L 0805 10µF, 10V, ±10%, X7R

JP1 Header Sullins Connector PEC03SAAN 3x1, Tin plated

10mm x

L1 Inductor Coiltronics DR125-470-R 47µH, 2.71A, 0.074 Ω, SMD

12.5mm

R1 Resistor Yageo America RC0603FR-07127KL 0603 127 kΩ, 1%, 0.1W

R2 Resistor Vishay-Dale CRCW060318K2FKEA 0603 18.2 kΩ, 1%, 0.1W

R3 Resistor Yageo America RC0603FR-07169KL 0603 169 kΩ, 1%, 0.1W

R4 Resistor Yageo America RC0805JR-070RL 0805 0 Ω, 5%, 0.125W

R6 Resistor Vishay-Dale CRCW06033K01FKEA 0603 3.01 kΩ, 1%, 0.1W

R7 Resistor Vishay-Dale CRCW06032K00FKEA 0603 2.00 kΩ, 1%, 0.1W

R8 Resistor Panasonic ERJ-6RQFR47V 0805 0.47 Ω, 1%, 0.125W

U1 Switching Regulator Texas Instruments LM5160ADNT WSON-12

R5 Resistor Unpopulated 0603

R9 Resistor Unpopulated 0603 18.2 kΩ, 1%, 0.1W

C6 Ceramic Capacitor Unpopulated 0603

C7 Ceramic Capacitor Unpopulated 0603

Schottky Diode (Use with

D1 Diodes Inc. B0530W-7-F (Unpopulated) SOD-123 30 V, 0.5 A

LM5160A only)

Q1 MOSFET Unpopulated SOT-323 N-CH, 50V, 0.2A

7 Performance Curves with LM5160A, LM5160

Figure 6. Load Regulation Figure 7. Efficiency vs. IOUT

SNVU441B–October 2014–Revised April 2015 LM5160A, LM5160 User’s Guide

Input Voltage (V)

Efficiency (%)

5 15 25 35 45 55 65

100

IO= 0.5A

IO= 1A

IO= 1.5A

Load Current (A)

Efficiency (%)

0.005 0.01 0.05 0.1 0.5 1 1.5

100

FPWM = 0

FPWM = 1

Vin =12V

Vin = 24V

Vin = 48V

Performance Curves with LM5160A, LM5160

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Figure 9. Efficiency DCM vs. CCM at 300kHz

Figure 8. Efficiency vs. VIN

Figure 10. VIN = 48V and FPWM = 0 at no load Figure 11. VIN = 48V and FPWM = 0 at no load (Zoomed)

Figure 12. VIN = 48V and FPWM = 1 at no load Figure 13. Load Transient (IO= 300mA to 1.5A)

8LM5160A, LM5160 User’s Guide SNVU441B–October 2014–Revised April 2015

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VSW (20 V/div)

iLIND (500 mA/div)

VOUT (5 V/div)

VSS (2 V/div)

Time = 50 µs/div)

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Performance Curves with LM5160A, LM5160

Figure 14. Startup at RLOAD = 3ΩFigure 15. Pre-Bias Startup at RLOAD = 3Ωand VIN = 48V

Figure 17. EN/UVLO Startup at RLOAD = 100Ωand VIN = 24V

Figure 16. EN/UVLO Startup at RLOAD = 5Ωand VIN = 24V

Figure 18. Output Short-Circuit at VIN = 48V

SNVU441B–October 2014–Revised April 2015 LM5160A, LM5160 User’s Guide

Revision History

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Revision History

Changes from A Revision (February 2015) to B Revision ............................................................................................. Page

• Added information for LM5160A EVM.................................................................................................. 4

• Added updated EVM views with LM5160A ............................................................................................ 5

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

10 Revision History SNVU441B–October 2014–Revised April 2015

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