Tagged Questions

2
votes
2answers
91 views

DC/DC Converter minimum load?

I'm using the NTE0506MC DC/DC converter which boosts 5V to 6V. The output voltage I'm measuring with no load is 9V not 6V. In page 3 of the datasheet they mention that it needs a minimum load of 10% ...
1
vote
2answers
96 views

Building a motorcycle accessory power connector - Values for capacitors and diodes?

After finding out that a component I wanted to base a circuit around isn't suitable, I've found a possible replacement part, but I have questions about the values for Cin and Cout capacitors and the ...
0
votes
1answer
177 views

Atx psu 7v output

What is an easy way to get 7-7.2vdc from an scavenged atx psu? I had thought about using a lm317 but I'm going to need at least 5-7 amps of current, and the 12v-5v split just sounds like a really bad ...
1
vote
1answer
196 views

Adjustable 9v - 15v 1.5A DC Switching Power Supply from 6 D batteries

I am starting a project that needs a way to adjust a 9v supply to anywhere from 9v - 15v at 1.5A. The power is coming from 6 D cell batteries so the voltage will drop as the batteries wear down. ...
6
votes
3answers
1k views

Should I isolate grounds of an isolated DC/DC converter?

If I use an isolated DC/DC converter, when designing the PCB, should I isolate the ground of the input and the ground of the output as shown below? I've never isolated grounds (except for AGND and ...
2
votes
2answers
612 views

Need help with a DC-DC converter using a MC34063

I'm trying to make a DC/DC converter from 12V to 5V using a MC34063. I found an old cell phone car charger and removed everything and set it up on my breadboard. I'm getting 5V out but only 0.12A. ...
0
votes
1answer
246 views

Building a simple switching regulator for DC12V -> DC5V

I want to build a circuit that provides USB power from a 12V battery (lipo or car battery). I have an iPad that draws 2A from its charger: So I'd like to get up to 10W output. What's a good choice ...
2
votes
3answers
322 views

Cost effective way to convert 12v DC to 7.6v DC @2A

I'm working on a hobby project that involves continuously powering a 5 watt handheld radio for long periods of time off a 12v automotive electrical system (in reality the input will be more like ...
11
votes
2answers
337 views

Negative Inductance and Cascaded DC/DC Converter Instability

I'm trying to debug a pair of cascaded DC/DC converters and have ran into a brick wall. The local FAE said that it is probably something to do with "Negative Input Inductance" on the second converter ...
3
votes
5answers
2k views

Ultra low noise power supply

I am trying to design an ultra low noise power supply for my sensitive circuit. The supply will provide 5V and 600mA. (Worst case, 200mA typical). My input voltage is 2V to 4V. My ripple target under ...
4
votes
2answers
864 views

Calculating Power Loss in Switching Power Regulator?

I am new to the construction of DC/DC power supplies (still a university student) and have built basic supplies using simple linear voltage regulators. I have recently discovered the world of ...
6
votes
2answers
507 views

is it OK to stack several DC-DC converters with their inputs connected in series to support a larger input voltage?

Imagine I have a single-IC switching DC-DC converter which supports input voltage up to 16V, for example a LM2727. Can I stack the inputs of such converter in series, for example 64 of them, and be ...
3
votes
5answers
2k views

how to build a high-power (4kW) switched-mode DC-DC converter?

I would like to build a switched-mode DC-to-DC converter which should support up to 4000 W of power. It should be able to act as a CCCV power-supply, so supply a constant current Imax up to the point ...
0
votes
5answers
773 views

Supply power to mini-ITX from car battery

Two related questions have been combined here as the answers and concepts overlap: (Q1) We are building a robot that will be controlled by mini-ITX PC. The power source for robot will be detached ...
5
votes
5answers
5k views

12V DC UPS for Network Equipment

Many times we want to kept running low power devices like DSL modems, etc. Most of these devices take 12V/9V DC so why to use ordinary UPS which convert AC to DC to AC, lots of conversion lots of ...