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.
yes, MP1 MP2 are both pfets and use as switches. They are stacked as high-side part. What is bump back your mean??
- - - Updated - - -
because of the power comsunption, i only want this divider for low portion of the cycle. and i thought this questions might caused by some leakage in MP2, not...
Here is a topology presented by Sean R.Bradburn.
For high-side gate driver, when the switches are off, source voltage of Mp2 will fall to VDD. C1 discharges through diode.
But !!!!!!!!
why the gate voltage of Mp2 will fall further below its source voltage through diode???
Someone please...
I use two same mos diode(G and D connected mosfet which acts like diode) stacked as normal free wheeling diode. The symbol is like the pic1 below because they are insulated mosfet with pwell/dnwell and dnwell/psub junction diodes.
The problem is
1.when the diode is reversed biased, their...
thanks for your answer! when u say the spike is due to junction capacitance, how to improve it? it happens on the diode(mos acts as diode) when the swtich from off to on state.
And i m also confused about the discharging trace of the junction capacitance. Does it discharge through the output...
Hello everyone,
Does mos diode also has forward and reverse recover time? I know the body diode has, but what about the whole mos diode?
when i used mos diode as normal PN diode in a buck converter, I saw a current which looks like a "reverse recovery current" though my mos diode like picture...
thanks for your recommendation! But when i used mos diode as normal PN diode in a buck converter, I also saw a current which looks like a "reverse recovery current" though my mos diode like picture shows below. So i wonder if this happens because the depletion capacitances need to discharge...
Hello everyone..
I know it's maybe a stupid question but i can't find a proper testbench to know the diode recovery time.
I used a pulse signal with -2V-2V, and with the current , i didn't see any strike....
by the way, is there any recover time for mos diode?????
1. you are right. And the both side influence each other. like When VdMn1 starts to go higher, then the Vout goes higher and meanwhile the VdMp1 goes higher.
2. Actually i don't want my buck converter to work at DCM because of the efficiency. Till now, when the Vout change from 0-3Vdd , I can't...
Re: problems about synchronous Buck converter with 2 switch
thanks a lot!
And i have another question about the dead-time control for the synchronous buck.
When i use switch stack like the schematic shows in bild1,can i just consider the dead time control to be something like : i only need to...
problems about synchronous Buck converter with 2 switch
For my DCDC BUCK CONVERTER:
Vin=3.6V Vout=1.2V Iout=150mV f=1MHZ L=8uH C=0.25uF R=8Ω Vin1 signal=0-1.2V Vin2 signal=(2.4-3.6V)
I'm using the schematic below as the synchronous switch part for my buck converter.When Vin1 from 0-1.2, Vin2...
I don't understand it very much.. when mosfet works as a diode, it should be always in saturation region cuz vDG >= -VT
Do u mean Vth can be also minus?????:?:
Hello everyone!
I'm trying to design a buck converter with pmos as switch and nmos as diode by using TSMC 65um.
Vin=3.6V Vout=1.2V Iout=150mV Vripple<50mV f=1MHZ
I caculated : L=8uH C=0.25uF R=8Ω
I have two questions now and hope someone can help me:
1.For the pmos as switch, i caculated the...
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.
