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3

SNVU504A – August 2016 – Revised August 2016

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Copyright © 2016, Texas Instruments Incorporated

List of Figures

List of Figures

1

Buck EVM Setup

.............................................................................................................

6

2

Load Regulation

..............................................................................................................

7

3

Line Regulation

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7

4

Efficiency vs. I

OUT

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7

5

Efficiency Comparison Between Forced CCM and DCM

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7

6

Startup at Full Load

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7

7

Steady State at V

IN

= 48 V and FPWM = 0 (no load)

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7

8

Steady State at V

IN

= 48 V and FPWM = 1 (no load)

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8

9

EN/UVLO Startup/Shutdown at Full Load

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8

10

Pre-Bias Startup at No Load

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8

11

Load Transient (I

Load

= No Load to Full Load to No Load) in DCM

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8

12

Load Transient (I

Load

= No Load to Full Load) in DCM

...................................................................

8

13

Load Transient (I

Load

= Full Load to No Load) in DCM

...................................................................

8

14

Load Transient (I

Load

= No Load to Full Load to No Load) in CCM

....................................................

9

15

Load Transient (I

Load

= No Load to Full Load) in CCM

...................................................................

9

16

Load Transient (I

Load

= Full Load to No Load) in CCM

...................................................................

9

17

Short Circuit (I

Load

= Full Load to Short to Full Load)

....................................................................

9

18

Short Circuit (I

Load

= Full Load to Short)

...................................................................................

9

19

Line Transient (36V

IN

-100V

IN

-72V

IN

)

.......................................................................................

9

20

LM5161 Synchronous Buck EVM Schematic

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11

21

EVM Component View with LM5161

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12

22

EVM Top Copper View with LM5161

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12

23

EVM Bottom Copper View with LM5161

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12

24

EVM Top Solder Mask with LM5161

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12

Summary of Contents for LM5161

Page 1: ...LM5161PWPBKEVM Buck Evaluation Module User s Guide Literature Number SNVU504A August 2016 Revised August 2016 ...

Page 2: ...Table of Contents Contents 1 Introduction 5 2 EVM Description and Performance Specifications 5 3 Test Setup and Operation 5 3 1 Recommended Test Setup 5 3 2 Operation 6 4 Typical Performance Curves 7 5 LM5161 Buck EVM Schematic 11 6 LM5161 Buck EVM Bill of Materials 12 7 LM5161 Buck EVM PCB Layout 12 Revision History 14 ...

Page 3: ...oad 8 11 Load Transient ILoad No Load to Full Load to No Load in DCM 8 12 Load Transient ILoad No Load to Full Load in DCM 8 13 Load Transient ILoad Full Load to No Load in DCM 8 14 Load Transient ILoad No Load to Full Load to No Load in CCM 9 15 Load Transient ILoad No Load to Full Load in CCM 9 16 Load Transient ILoad Full Load to No Load in CCM 9 17 Short Circuit ILoad Full Load to Short to Ful...

Page 4: ...sed August 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated List of Tables List of Tables 1 LM5161 Buck EVM Specifications 5 2 FPWM Pin Mode 7 3 LM5161 Buck EVM Bill of Materials for 300 kHz Configuration 12 ...

Page 5: ...es a 12 V output over an input voltage range of 15 V to 80 V with output current rated up to 1 A The application schematic of the EVM has been set up to operate from a nominal 48 V input supply The switching frequency is set to approximately 300 kHz The board is designed to demonstrate a synchronous buck with small solution size for 12 W wide VIN applications Table 1 LM5161 Buck EVM Specifications...

Page 6: ...ll solution size The saturation current rating ISAT of the inductor should be higher than the LM5161 integrated high side FET peak current limit threshold of 1 9 A max The nominal switching frequency in Hz can be set using the RON R1 in the EVM resistor as shown in Equation 1 1 The output voltage is set by using the feedback divider resistors R8 RFB1 and R7 RFB2 in the EVM by using Equation 2 2 Th...

Page 7: ... series with the output capacitors or the external ripple injection circuit see Section 7 for more details The internal emulated ripple is sufficient to maintain steady state and dynamic stability while operating in this mode In a typical buck application at TJ 125 C and FPWM 0 with the input voltage VIN 72 V and the VCC externally supplied add a BST resistor R2 recommended 3Ω in series with the B...

Page 8: ...it Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM5161 Buck EVM User s Guide VOUT 12 V FPWM 1 FSW 300kHz Figure 4 Efficiency vs IOUT VOUT VCC diode connected FSW 300kHz VOUT 12 V Figure 5 Efficiency Comparison Between Forced CCM and DCM VIN 48 V FSW 300kHz FPWM 1 VOUT VCC diode connected Figure 6 Startup at Full Load Figure 7 Steady State at VIN 48 V and FPWM 0 no load Figu...

Page 9: ...V FPWM 0 FSW 300kHz Figure 11 Load Transient ILoad No Load to Full Load to No Load in DCM VIN 48 V FPWM 0 FSW 300kHz VOUT 12 V Figure 12 Load Transient ILoad No Load to Full Load in DCM VIN 48 V FPWM 0 FSW 300kHz VOUT 12 V Figure 13 Load Transient ILoad Full Load to No Load in DCM VIN 48 V FPWM 1 FSW 300kHz VOUT 12 V Figure 14 Load Transient ILoad No Load to Full Load to No Load in CCM VIN 48 V FP...

Page 10: ...Buck EVM User s Guide VIN 48 V FPWM 1 FSW 300kHz VOUT 12 V Figure 16 Load Transient ILoad Full Load to No Load in CCM VIN 48 V FSW 300kHz VOUT 12 V Figure 17 Short Circuit ILoad Full Load to Short to Full Load VIN 48 V FSW 300kHz VOUT 12 V Figure 18 Short Circuit ILoad Full Load to Short FSW 300kHz VOUT 12 V ILoad 500 mA Figure 19 Line Transient 36VIN 100VIN 72VIN ...

Page 11: ...3 6 81k R9 402k R1 IOUT 1A 100k R6 10 0k R7 0 R4 10µF C12 1000pF C7 1 2 J1 VIN 15 80VDC L2 DR125 101 R 2 2µF C4 10µF C11 SW SW 1 2 J3 GND 1 2 J4 0 R2 Copyright 2016 Texas Instruments Incorporated www ti com LM5161 Buck EVM Schematic 11 SNVU504A August 2016 Revised August 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM5161 Buck EVM User s Guide 5 LM5161 Buck EVM ...

Page 12: ...25 W R9 Vishay Dale CRCW06036K81FKEA 0603 RES 6 81 k 1 0 1 W R6 Vishay Dale CRCW0603100KFKEA 0603 RES 100 k 1 0 1 W R7 Vishay Dale CRCW060310K0FKEA 0603 RES 10 0 k 1 0 1 W R8 Vishay Dale CRCW06032K00FKEA 0603 RES 2 00k 1 0 1W U1 Texas Instruments LM5161PWPR 4 4 mm x 5 0 mm HTSSOP 14 C7 MuRata GRM188R72A102KA01D 0603 CAP CERM 1000 pF 100 V 10 X7R C10 MuRata Unpopulated if FPWM 0 GCM188R71H104KA57D ...

Page 13: ...2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM5161 Buck EVM User s Guide Figure 21 EVM Component View with LM5161 Figure 22 EVM Top Copper View with LM5161 Figure 23 EVM Bottom Copper View with LM5161 Figure 24 EVM Top Solder Mask with LM5161 ...

Page 14: ... August 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated Revision History Revision History Changes from Original August 2016 to A Revision Page Changed datasheet crossreference to LM5161 7 Changed Orderable name to LM5161PWPR 12 ...

Page 15: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Page 16: ... by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la rég...

Page 17: ... connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Page 18: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Page 19: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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