Tagged Questions

0
votes
1answer
83 views

Is it important to have common ground between you microcontoller and high-power devices on the same PCB?

I noticed that there are more N-channel mostfets than P-channel mosfets on the market. Then I realised that probably in many applications, the high powered device runs on a higher voltage and ...
3
votes
1answer
137 views

Synchronous DC-DC converter and fast diodes

I'm a bit at a loss when trying to optimize a DC-DC converter (Half Bridge) and selecting my MOSFETs. Up to 200V I get good results (MOSFET switching times are fast ~ 20ns and the anti-parallel diode ...
1
vote
2answers
91 views

Question about using N-channel MOSFETs in a current sharing controller

My question is specifically regarding LTC4353 : Product link: http://www.linear.com/product/LTC4353 Datasheet link: http://www.linear.com/docs/41582 Looking at the diagram on the product ...
1
vote
1answer
96 views

powering a fan with ATX PSU 5v standby when off, with 12v when on

Using an ATX PSU, how would I design a circuit to power a load (dc fan) with 5v standby when PSU is off, and with 12v when PSU is on. I want to control (on/off or pwm, it should not matter?) the fan ...
1
vote
1answer
89 views

Selecting a suitable mosfet for Linear Technology LTC4412HV

I would like to choose a suitable P-MOSFET for power switching with the Linear Technology LTC4412HV. This IC is just an ORing for two power supplies to select the best between two batteries. The ...
1
vote
1answer
207 views

P-chan MOSFET as power switch

I want to create a power switch (on/off) for a hot-swap plug-in module that connects to my (future) PCB. Got a MCU on board and a single 3.3V supply, fed from AA batteries with through a DC/DC, this ...
2
votes
1answer
420 views

MOSFET on/off switch — asking for critique

I want a "power button" that is actually two buttons; one on, one off. This needs to switch on the order of 15 V and up to 10 A, for a LiFePO4 battery powered device. I don't want to use a hardwired ...
2
votes
1answer
683 views

Power MOSFETs and Gate drivers

I'm trying to finally apply what I learned at university in the course of power electronics. However I find that both that course and most of the books / online references are lacking on some points. ...
2
votes
2answers
525 views

Using a MOSFET as a switch

I would like to use the smallest component to control the power of a component (nano motor). I have seen on the web two main possibilities: DC converter : LTC3127 for example, I change the value of ...
0
votes
0answers
190 views

Help with using mosfets to switch positive and negative supplies

Can any one please direct me to a schematic for a MOSFET based DC switching circuit whose output switches between +100V and -100V. I already came up with the MOSFET driver circuits to switch the ...
5
votes
3answers
263 views

Apparent inconsistency of MOSFET power rating in datasheet: SOA v. max power

I am trying to use an IPP114N03L G (datasheet). I calculated the maximum power it could handle as follows: From the first two pages of the datasheet: Rthjc = 3.9K/W Tj(max) = 175C Assuming I can ...
6
votes
6answers
709 views

Power consumed by a CPU

I think the power for a CPU with current I and voltage U is I · U. I wonder how the following conclusion from Wikipedia is derived? The power consumed by a CPU, is approximately ...
4
votes
3answers
482 views

Design considerations for micro dc to three phase ac AVR based (ESC) for miniature UAV applications

This is a huge question, I plan to present the problem in detail and my current plan of action for solving it. I'm hoping to get pointers on what to and not to do. I was involved with a recent ...
10
votes
4answers
667 views

Don Lancaster's Magic Sinewaves

For several years now Don Lancaster is promoting magic sinewaves. They are strings of binary digits (like 420 bits for a full sine cycle) that, when used to drive a digital switch (MOSFET/IGBP), ...