Commit 1bff4d5f authored by Ruben Castro's avatar Ruben Castro

Update README.md

parent 3b1f3921
Hello!
This is my first attempt at a circuit board. It shall hold an H-bridge for
motor control, current sensing, and SPI pins for encoder implementation.
It is a board that revolves around the DRV8701 (http://www.ti.com/product/DRV8701)
gate driver chip. The DRV8701 is capable of driving a varied set of MOSFETS.
Chosen here are the AON7410 MOSFETS.
Design Rules:
## Design Rules:
-5A continuous/10A peak rating
-0-10A to 0-1.5V mapping current sensing
-12V Motor
......@@ -13,7 +12,7 @@ Design Rules:
-Not hotter than 70C
DRV8701 Rules:
## DRV8701 Rules:
Vgs(voltage applied to MOSFET gate) = 9.5V
Ivcp(current capable of being applied to MOSFET gate - dependent on Vm) = 12mA
20v/v conversion for current sense - for 0-10A to 0-1.5V mapping, you need a ~7 mOhm resistor rated for >=2watts
......@@ -22,13 +21,13 @@ Lots of passive components need to be around the IC.
Here is board version 2.0
TOP
##TOP
![routedTop](media/circuitV2Top.png)
BOTTOM
##BOTTOM
![routedBottom](media/circuitV2Bottom.png)
......@@ -38,7 +37,7 @@ BOTTOM
A few concerns here arise with v2.0 that need to be addressed by checking some
parameters in person, which I shall do tomorrow.
Problems
#Problems
The fill for GND that goes towards the Motor GND has a choke point at the corner
due to the headers for uploading code being right next to the power and GND sources.
......@@ -54,7 +53,7 @@ shunt resistor. Right now it is set to 7mOhm, which would return to the ADC
150mV/A
Solved Problems/Interesting Challenges
#Solved Problems/Interesting Challenges
Due to the way the PWR and GND are conected, I had to get creative with the GND
planes. With the limited knowledge I have gathered. I limited the motor GND to the
TOP plane, and kept the Bottom ground plane as clear as possible for the Gate Driver
......@@ -66,7 +65,7 @@ TOP plane, and kept the Bottom ground plane as clear as possible for the Gate Dr
Basic definitions I learned in the process-
##Basic definitions I learned in the process-
Bulk Capacitor - Capacitor used to be capable of taking over battery in certain sags. It is
set as close to the input as possible. In this case an electrolytic >=10uF.
......@@ -87,7 +86,7 @@ Net Ties- Just like a trace, except its meant to be isolated from other traces o
Kelvin Connection- Way of connecting traces to Rsense. It just makes sense
Take it for granted. Google how to do it. It's very simple.
PCB guides:
#PCB guides:
45 degree traces only
Kelvin Connection for Rsense
......@@ -99,7 +98,7 @@ Many many more to be copied from my notebook soon.
Sources:
#Sources:
MOSFET: https://www.digikey.com/product-detail/en/alpha-omega-semiconductor-inc/AON7410/785-1581-1-ND/3621507
......
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