I've been puzzling over this, off and on, for months. I want to switch the panel voltage (high side) on/off with an N-Channel MOSFET.
I've been told that a high side driver is the way to go. I have a functioning circuit with a P-Channel MOSFET here:
http://backyardsolar.blogspot.com/
I have a LTC4440 (High side driver from Linear, datasheet attached) on my breadboard now and I'm trying to figure out how to make it work based on the datasheet. It says the the gate output (TG) swings between TS (source voltage, the 12V battery positive terminal in my case) and Boost (where I get the boost level voltage is what I'm struggling with).
For some reason I thought high side drivers had internal charge pumps that magically created the voltage necessary to turn on the MOSFET themselves. I guess I need to create that voltage level myself? Is that what they mean by the term "bootstrapped supply"? How is this supply level usually produced?
Thanks for the help in advace.
I've been told that a high side driver is the way to go. I have a functioning circuit with a P-Channel MOSFET here:
http://backyardsolar.blogspot.com/
I have a LTC4440 (High side driver from Linear, datasheet attached) on my breadboard now and I'm trying to figure out how to make it work based on the datasheet. It says the the gate output (TG) swings between TS (source voltage, the 12V battery positive terminal in my case) and Boost (where I get the boost level voltage is what I'm struggling with).
For some reason I thought high side drivers had internal charge pumps that magically created the voltage necessary to turn on the MOSFET themselves. I guess I need to create that voltage level myself? Is that what they mean by the term "bootstrapped supply"? How is this supply level usually produced?
Thanks for the help in advace.
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