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LX7178 EVAL BOARD USER GUIDE

Microsemi

Analog Mixed Signal Group

One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100



2012

Rev. 0.1, 2013-10-23

Rev. 1.0, 2013-10-23

LX7178 EVALUATION BOARD

USER GUIDE

LX7178 5 Amp Step Down Converter

Содержание LX7178

Страница 1: ...D USER GUIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Copyright 2012 Rev 0 1 2013 10 23 LX7178 EVALUATION BOARD USER GUIDE LX7178 5 Amp Ste...

Страница 2: ...2 Applications 2 Part Specific Information 3 Evaluation Board Schematic 3 Basic Connection Instructions 4 LX7178 I2 C GUI 5 Recommended Operating Conditions 6 PCB Layout of Evaluation Board 7 Bill of...

Страница 3: ...instantaneous correction to line load transients It does not require high ESR output capacitors and incorporates energy saving PSM Power Save or Pulse Skip Mode at light loads to extend battery life...

Страница 4: ...ency Hysteretic Control Extremely Fast Line Load Transient Response I2 C for Output Adjustment 3 4Mbps 1 875MHz Switching Frequency Extremely Low RDSON MOSFETS Input Voltage Rail 3 3V to 5V Current 5A...

Страница 5: ...10 23 Part Specific Information IC Part Number Description LX7178 xyCSP WLCSP 20Ball 0 4mm Pitch Note x is the 2 LSB bits of the binary I2 C slave address 0 to 3 y is the set output voltage 0 is 0 6V...

Страница 6: ...949 380 6100 Page 4 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Basic Connection Instruction Power Supply LOAD Sub 20 USB I2C Adaptor IN SDA AGND SCL Computer Figure 2 Power Supply and Load...

Страница 7: ...I2 C GUI LX7178 I2 C GUI is a graphic user interface that can read write IC status or change default settings via I2 C serial portal For example it can used to enable disable device change output volt...

Страница 8: ...s turned off However the I2 C bus circuitry is still active and maybe programmed Setting the Output Voltage Using the I2 C interface you can adjust VOUT from 0 6V to 1 2V When I2 C interface is implem...

Страница 9: ...Board is a 4 layer board the thickness of the board is 63mil in total The second layer to top layer is 7mil the third layer to the bottom layer is 7mil No microvias or blind vias are needed each signa...

Страница 10: ...EVAL BOARD USER GUIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 8 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 6 Top Sil...

Страница 11: ...UIDE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 9 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 7 Layer 1 Top Layer Figure...

Страница 12: ...DE Microsemi Analog Mixed Signal Group One Enterprise Aliso Viejo CA 92656 USA 800 713 4113 949 380 6100 Page 10 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Figure 9 Layer 3 Sense Layer Figur...

Страница 13: ...crosemi IC LX7178 xy U1 1 2 Test Point SW PGOOD VIN_S VO_S GND_S GND_S 6 3 Terminal VIN VOUT GND GND 4 4 Jumper 3pin JP2 1 5 Jumper 4pin J2 1 CAPACITORS Item Part Description Reference Qty 6 1uF 10V X...

Страница 14: ...USA 800 713 4113 949 380 6100 Page 12 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Efficiency Plot Figure 11 Efficiency Plot of LX7178 01CSP 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 Effici...

Страница 15: ...713 4113 949 380 6100 Page 13 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Dynamic Load Response Scope Shots Figure 12 No load to 0 5A PWM Figure 13 No load to 0 5A PSM CH2 VOUT CH4 ILOAD CH2...

Страница 16: ...12 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Dynamic Load Response Scope Shots Continue Figure 16 0 5A to 2 5A PWM Rising Edge Figure 17 No load to 0 5A PSM Rising Edge CH2 VOUT CH3 SW CH4 ILOAD CH2 VOUT...

Страница 17: ...ght 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Start up and Short Condition Scope Shots Figure 20 Startup with ENABLE toggled Figure 21 Soft start VIN tied to ENABLE CH2 EN CH3 VOUT CH2 EN CH3 VOUT Fi...

Страница 18: ...ejo CA 92656 USA 800 713 4113 949 380 6100 Page 16 Copyright 2012 Rev 0 1 2013 10 23 Rev 1 0 2013 10 23 Start up and Short Condition Scope Shots Continue Figure 24 Power after Short Figure 25 Recovery...

Страница 19: ...search for driver 4 Firmware update The SUB 20 firmware version should be 0 3 5 Open Firmware updater tool The Firmware updater tool has a shortcut on the desktop It may also be found at Start Program...