Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
A soft start circuit is needed to prevent a huge inrush current from damaging your circuit during startup.
So a series resistance is connected which limits the inrush current below a safe value. Then during normal operation this resistance is shunted.(shorted)
The value of this series resistance is the "reset switch resistance".
firstly,where is the resistance coupled in the soft start circuit? could u give me an example,please?
secondly,what's the meaning of "full current limit" in the soft start circuit of a step up dc-dc convertor?
u see,here is a part of description in max8727
I don't think resistors are used in dc-dc converters as soft-start circuits ..
In the following article you will find out how it (soft-start, that is) can be implemented in dc-dc switching converters ..
"Simple soft-start circuit for switching regulators": **broken link removed**
.. The circuit shows a 5-V to 3.3-V, 1.5-A switching regulator with an additional op amp, U1, that forces the output voltage to follow the exponential voltage rise on C1 (see the figure). Consequently, the startup voltage will ramp up in 50 ms. As the output voltage tries to exceed the voltage across C1, the op amp controls the switch duty cycle by injecting current into the feedback node, thus guiding the output voltage into regulation. When the startup voltage reaches 3.3 V ..
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
