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Texas Instruments LM267 Series, User Manual, Page: 3 / 14

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Texas Instruments LM267 Series User Manual Download Page 3

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General Description

Figure 2. Top Layer Foil Pattern of Printed Circuit Board

Figure 3. Bottom Layer Foil Pattern of Printed Circuit Board

3

SNVA013D – December 2000 – Revised April 2013

AN-1135 LM267X 3A, 5A Evaluation Boards

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Copyright © 2000–2013, Texas Instruments Incorporated

Summary of Contents for LM267 Series

Page 1: ...ows an overview of the family of devices with special features of each indicated Consult the device data sheet or use the special power supply design software calledSwitchers Made Simple version 6 X available for free download from www ti com to determine all necessary component values for the particular device being used to accomplish a specific design and board layout considerations The printed ...

Page 2: ...or typ 1 kΩ for adjustable output converters This designator is left shorted replaced by a jumper wire for fixed output voltage converters R3 Current limit resistor for LM2673 LM2679 Sync input resistor 1 kΩ for LM2670 and LM2677 Not inserted for LM2676 and LM2678 L1 Inductor All devices CSYNC Sync input capacitor 100 pF LM2670 and LM2677only Not inserted with other devices CSS Soft start capacito...

Page 3: ...Pattern of Printed Circuit Board Figure 3 Bottom Layer Foil Pattern of Printed Circuit Board 3 SNVA013D December 2000 Revised April 2013 AN 1135 LM267X 3A 5A Evaluation Boards Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 4: ...ation these components are normally not required if proper care to minimize trace lengths is taken in the PCB design 4 Example Circuit Designs Example 1 5V 3A Converter with Surface Mount Components In this example it is desired to convert a voltage range of between 8V and 12V to 5VDC with load current of 3A It is also desired to implement the design with surface mount components only Softstart du...

Page 5: ...w shows the 5V 3A design circuit This solution is available as evaluation board LM2673S 5_EVAL Figure 6 through Figure 9 show the output waveforms for output voltage with 500 mA load output voltage with 1A load output ripple with 1A load output voltage with 3A load output ripple with 3A load output response to 1A transient load and output response to 3A transient load respectively Figure 5 5V 3A D...

Page 6: ...TAGE VOUT 2V DIV B LOAD CURRENT ILOAD 1A 500 mA DIV Figure 8 Output Voltage with 1A Load A OUTPUT RIPPLE 10 mV DIV B LOAD CURRENT ILOAD 1A 1A DIV Figure 9 Output Ripple with 1 Amp Load 6 AN 1135 LM267X 3A 5A Evaluation Boards SNVA013D December 2000 Revised April 2013 Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 7: ...10 mV DIV B LOAD CURRENT ILOAD 3A 1A DIV Figure 11 Output Ripple with 3 Amp Load A OUTPUT RESPONSE 1V DIV B TRANSIENT LOAD CURRENT 1A DIV Figure 12 Output Response to 0 1A Transient Load 7 SNVA013D December 2000 Revised April 2013 AN 1135 LM267X 3A 5A Evaluation Boards Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 8: ...t Number U1 Texas Instruments LM2679 CIN 3 x 15 µF 50V Vishay 594D156X0050R2T CINX 0 47µF Vishay VJ1210U474ZXAA CB 0 01µF 50V Vishay VJ1206Y103ZXXA D1 8A 35V Schottky 500 mV at 5A Motorola MBRD835L R3 4 99 kΩ 7 19A current limit Vishay CRCW12064991J L1 15 µH Coilcraft D05022P 153 CSS 4 7 nF 100V 1 0 ms softstart Vishay VJ1206Y47ZJXBAB COUTX 0 47 µF Vishay VJ1210U474ZXAA COUT 2 x 180 µF 16V Vishay ...

Page 9: ...ENT ILOAD 500 mA 500 mA DIV Figure 15 Output Voltage with 500 mA Load A OUTPUT RIPPLE 100 mV DIV B LOAD CURRENT ILOAD 500 mA 1A DIV Figure 16 Output Ripple with 500 mA Load 9 SNVA013D December 2000 Revised April 2013 AN 1135 LM267X 3A 5A Evaluation Boards Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 10: ...ad A OUTPUT RIPPLE 100 mV DIV B LOAD CURRENT ILOAD 2 5A 2A DIV Figure 18 Output Ripple with 2 5A Load A OUTPUT VOLTAGE VOUT 2V DIV B LOAD CURRENT ILOAD 5A 2A DIV Figure 19 Output Voltage with 5A Load 10 AN 1135 LM267X 3A 5A Evaluation Boards SNVA013D December 2000 Revised April 2013 Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 11: ...PONSE 1V DIV B TRANSIENT LOAD CURRENT 500 mA DIV Figure 21 Output Response to 0 0 5A Transient Load A OUTPUT RESPONSE 1V DIV B TRANSIENT LOAD CURRENT 1A DIV Figure 22 Output Response to 0 2 5A Load Transient 11 SNVA013D December 2000 Revised April 2013 AN 1135 LM267X 3A 5A Evaluation Boards Submit Documentation Feedback Copyright 2000 2013 Texas Instruments Incorporated ...

Page 12: ... advisable to have a minimal load of at least 10 mA during startup when the input to output differential voltage is greater than 10V to prevent output ramping beyond desired value 6 3 PCB Layout Optimization As in any switching regulator layout is very important Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems For minimal inducta...

Page 13: ...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...

Page 14: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LM2673 5 0EVAL LM2679 5 0EVAL LM2679 5 0EVAL NOPB ...

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