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Summary of Contents for Microsemi LX7178
- Page 1 LX7178 EVAL BOARD USER GUIDE LX7178 EVALUATION BOARD USER GUIDE LX7178 5 Amp Step Down Converter Microsemi Copyright 2012 Analog Mixed Signal Group Rev. 0.1, 2013-10-23 One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100...
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Page 2: Table Of Contents
LX7178 EVAL BOARD USER GUIDE Table of Contents Introduction to Product ....................1 Key Features ......................2 Applications ....................... 2 Part Specific Information ................... 3 Evaluation Board Schematic ..................3 Basic Connection Instructions ................... 4 LX7178 I C GUI ......................5 Recommended Operating Conditions ................ -
Page 3: Introduction To Product
(it can also operate in default mode). In addition it includes robust fault monitoring functions. The LX7178 will operate from 3V to 5.5V, and is available in a fixed output voltage option of 0.8V (no voltage divider is necessary). The output voltage can also be adjusted with an external voltage divider up to 3.3V. -
Page 4: Key Features
LX7178 EVAL BOARD USER GUIDE Key Features Constant Frequency Hysteretic Control Extremely Fast Line/Load Transient Response I C for Output Adjustment (3.4Mbps) 1.875MHz Switching Frequency Extremely Low-R MOSFETS DSON Input Voltage Rail 3.3V to 5V, Current 5A ... -
Page 5: Part Specific Information
“y” is the set output voltage (0 is 0.6V, 1 is 0.8V, 2 is 0.9V, 3 is 0.975V) Evaluation Board Part Number Description LX7178 EVAL BOARD Evaluation PCB for LX7178 Evaluation Board Schematic Figure 1: Schematic of Evaluation Board Microsemi Copyright ... -
Page 6: Basic Connection Instructions
LX7178 EVAL BOARD USER GUIDE Basic Connection Instruction Sub-20 USB-I2C Adaptor Computer Power Supply LOAD Figure 2: Power Supply and Load Connection with I C Implemented Power Supply LOAD Figure 3: Power Supply and Load Connection without I C Implemented Microsemi Copyright ... -
Page 7: Lx7178 I 2 C Gui
C serial portal. For example, it can used to enable/disable device, change output voltage, or enable power saving mode, etc. More information about register map and I C function can be found in LX7178 datasheet. Note: To use this GUI, a sub-20 USB-I C adaptor is needed. See Dimax SUB-20 Installation details. -
Page 8: Recommended Operating Conditions
VOUT to GND should be greater than 100kΩ. The formula below calculates the value of VOUT based on the resistor divider R1 & R2. is determined by the chip, for example, to set the LX7178-01CSP to a VOUT = 0.96V, given V = 0.8V. -
Page 9: Pcb Layout Of Evaluation Board
PCB Layout of Evaluation Board The LX7178 EVAL 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;... - Page 10 LX7178 EVAL BOARD USER GUIDE Figure 6: Top Silkscreen Microsemi Copyright 2012 Page 8 Analog Mixed Signal Group Rev. 0.1, 2013-10-23 One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100 Rev. 1.0, 2013-10-23...
- Page 11 LX7178 EVAL BOARD USER GUIDE Figure 7: Layer 1: Top Layer Figure 8: Layer 2: Ground Layer Microsemi Copyright 2012 Page 9 Analog Mixed Signal Group Rev. 0.1, 2013-10-23 One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100...
- Page 12 LX7178 EVAL BOARD USER GUIDE Figure 9: Layer 3: Sense Layer Figure 10: Layer 4: Bottom Layer Microsemi Copyright 2012 Page 10 Analog Mixed Signal Group Rev. 0.1, 2013-10-23 One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100...
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Page 13: Bill Of Material
Bill of Material M I S C E L L A N E O U S C O M P O N E N T S Item Part Description Reference Microsemi IC – LX7178-xy Test Point SW, PGOOD, VIN_S, VO_S, GND_S, GND_S... -
Page 14: Efficiency Plot
1.8V PSM 1.8V PWM 3.3V PSM 3.3V PWM 1000 Load Current (mA) Figure 11: Efficiency Plot of LX7178-01CSP Microsemi Copyright 2012 Page 12 Analog Mixed Signal Group Rev. 0.1, 2013-10-23 One Enterprise Aliso Viejo, CA 92656 USA (800) 713-4113, (949) 380-6100... -
Page 15: Dynamic Load Response Scope Shots
LX7178 EVAL BOARD USER GUIDE Dynamic Load Response Scope Shots Figure 12: No load to 0.5A PWM Figure 13: No load to 0.5A PSM CH2: VOUT, CH4: I CH2: VOUT, CH4: I LOAD LOAD Figure 14: 0.5A to 2.5A PWM Figure 15: 0.8A to 2.5A PWM... -
Page 16: Dynamic Load Response Scope Shots (Continue)
LX7178 EVAL BOARD USER GUIDE 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: I CH2: VOUT, CH3: SW, CH4: I... -
Page 17: Start Up And Short Condition Scope Shots
LX7178 EVAL BOARD USER GUIDE 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 Figure 22: Start Up When Vin=4.5V Load=0.5ohm... -
Page 18: Start Up And Short Condition Scope Shots (Continue)
LX7178 EVAL BOARD USER GUIDE Start up and Short Condition Scope Shots (Continue) Figure 24: Power after Short Figure 25: Recovery from Short CH2: VIN, CH3: VOUT, CH4: Inductor Current CH2: VIN, CH3: VOUT, CH4: Inductor Current Microsemi Copyright 2012... -
Page 19: Dimax Sub20 Installation
Click CD:/LX7178 GUI/I2C Register Access_1_0_8_x.exe to start the installation, To open the GUI, go to Startup> All Programs> Microsemi> Register Access> Choose "LX7165" when "production selects window “pops out. 8. LX7178 GUI and SUB-20 driver could be found in the Support CD Microsemi Copyright 2012...
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