background image

LX7180A 4 Amp Step-Down Converter Evaluation Board

Microsemi Proprietary and Confidential. LX7180A User Guide Revision 1.0

18

Microsemi Corporate Headquarters
One Enterprise, Aliso Viejo,
CA 92656 USA
Within the USA: +1 (800) 713-4113
Outside the USA: +1 (949) 380-6100
Fax: +1 (949) 215-4996
Email: [email protected]
www.microsemi.com

© 2017 Microsemi Corporation. All rights reserved. Microsemi and the 
Microsemi logo are trademarks of Microsemi Corporation. All other 
trademarks and service marks are the property of their respective owners.

Microsemi makes no warranty, representation, or guarantee regarding the information contained herein or the suitability of its products and services 
for  any  particular  purpose,  nor  does  Microsemi  assume  any  liability  whatsoever  arising  out  of  the  application  or  use  of  any  product  or  circuit.  The 
products sold hereunder and any other products sold by Microsemi have been subject to limited testing and should not be used in conjunction with 
mission-critical equipment or applications. Any performance specifications are believed to be reliable but are not verified, and Buyer must conduct and 
complete all performance and other testing of the products, alone and together with, or installed in, any end-products. Buyer shall not rely on any data 
and  performance  specifications  or  parameters  provided  by  Microsemi.  It  is  the  Buyer's  responsibility  to  independently  determine  suitability  of  any 
products and to test and verify the same. The information provided by Microsemi hereunder is provided "as is, where is" and with all faults, and the 
entire risk associated with such information is entirely with the Buyer. Microsemi does not grant, explicitly or implicitly, to any party any patent rights, 
licenses, or any other IP rights, whether with regard to such information itself or anything described by such information. Information provided in this 
document is proprietary to Microsemi, and Microsemi reserves the right to make any changes to the information in this document or to any products 
and services at any time without notice.

Microsemi  Corporation  (Nasdaq:  MSCC)  offers  a  comprehensive  portfolio  of  semiconductor  and  system  solutions  for  aerospace  &  defense, 
communications,  data  center  and  industrial  markets.  Products  include  high-performance  and  radiation-hardened  analog  mixed-signal  integrated 
circuits,  FPGAs,  SoCs  and  ASICs;  power  management  products;  timing  and  synchronization  devices  and  precise  time  solutions,  setting  the  world's 
standard for time; voice processing devices; RF solutions; discrete components; enterprise storage and communication solutions; security technologies 
and  scalable  anti-tamper  products;  Ethernet  solutions;  Power-over-Ethernet  ICs  and  midspans;  as  well  as  custom  design  capabilities  and  services. 
Microsemi is headquartered in Aliso Viejo, California, and has approximately 4,800 employees globally. Learn more at www.microsemi.com.

MSCC-0102-UG-01005-1.0-0717

Содержание LX7180A

Страница 1: ...LX7180A User Guide LX7180A 4 Amp Step Down Converter Evaluation Board...

Страница 2: ...Applications 2 2 2 Key Features 2 3 Evaluation Board Schematic 3 4 Basic Connection Instructions 4 5 Recommended Operating Conditions 5 5 1 Enabling Regulator from I C Bus 5 5 2 Setting the Output Vol...

Страница 3: ...ide Revision 1 0 1 1 Revision History The revision history describes the changes that were implemented in the document The changes are listed by revision starting with the most current publication 1 1...

Страница 4: ...faults Thermal protection shuts down the regulator under over temperature conditions Over voltage conditions will immediately shut off the output to protect against permanent damage The LX7180A automa...

Страница 5: ...nverter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 3 3 Evaluation Board Schematic The following illustration shows the evaluation board schematic Figure 1...

Страница 6: ...tructions The following illustration shows how to connect the evaluation board to the power supply while I C is 2 implemented Figure 2 Power Supply and Load Connection with I C Implemented The followi...

Страница 7: ...ramming the control register During disable the regulator and most of the support circuitry is turned off However the I C bus circuitry is still active and may be programmed 2 5 2 Setting the Output V...

Страница 8: ...ntial LX7180A User Guide Revision 1 0 6 6 PCB Layout of Evaluation Board The LX7180A evaluation board is a four layer board The recommended distance between ground layer and the top layer is 6 mil The...

Страница 9: ...LX7180A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 7 Figure 5 Layer 2 Ground...

Страница 10: ...LX7180A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 8 Figure 6 Layer 3 Sense...

Страница 11: ...LX7180A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 9 Figure 7 Layer 4 Bottom...

Страница 12: ...75 evaluation board Table 2 BOM Item Part Description Reference Quantity 1 Microsemi IC LX7180A xy U1 1 2 Test Point J3 SW PGOOD VIN_S VO_S GND_S GND_S 6 3 Terminal VIN VOUT GND GND 4 4 Jumper 4 pin J...

Страница 13: ...onverter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 11 8 Efficiency Plot The following graph shows the efficiency of the LX7180A at a voltage output of 1 V...

Страница 14: ...oard Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 12 9 Dynamic Load Response Scope Shots The following illustrations show the dynamic load response for the evaluation board F...

Страница 15: ...LX7180A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 13 Figure 10 Step Response Rising Edge Note CH2 VOUT CH3 SW Node CH4 I LOAD...

Страница 16: ...LX7180A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 14 Figure 11 Step Response Falling Edge Note CH2 VOUT CH3 SW Node CH4 I LOAD...

Страница 17: ...Proprietary and Confidential LX7180A User Guide Revision 1 0 15 10 Start up and Short Condition Scope Shots The following illustrations show the scope shots for the LX7180A Figure 12 Start up With ENA...

Страница 18: ...80A 4 Amp Step Down Converter Evaluation Board Microsemi Proprietary and Confidential LX7180A User Guide Revision 1 0 16 Figure 13 Soft Start VIN Tied to ENABLE Note CH1 PG CH3 V CH4 inductor current...

Страница 19: ...umber Description LX7180A 01CLQ QFN 2 mm 2 mm 12L IC LX7180A 11CLQ LX7180A 21CLQ LX7180A 31CLQ LX7180A xyCLQ1 LX7176A EVAL BOARD Evaluation PCB for LX7180A 1Consult factory for other I C slave address...

Страница 20: ...uyer s responsibility to independently determine suitability of any products and to test and verify the same The information provided by Microsemi hereunder is provided as is where is and with all fau...

Отзывы: