Tagged Questions

2
votes
1answer
65 views

Can a linear regulator in shutdown mode have the output in parallel with a switching regulator

I am trying to design an efficient battery powered circuit using a 3.3V microcontroller (NXP LPC1343). One of the requirements is that the microcontroller periodically read a value from an ADC and ...
5
votes
3answers
102 views

Voltage supply clipping to <=3.3V

So, I have this circuit which needs <50mA and can be supplied with a voltage between 2V and 3.3V. I want to supply it with a Li-Ion cell, which has 2.7-4.2V. I don't really want/need the ...
0
votes
1answer
86 views

Is it possible to increase voltage from a power supply without incuring great current lose

I have a 24V 4.5 amp(108 Watt) power supply. I know most Voltage regulators take a higher voltage and regulate it to a lower voltage. Is there a way to increase the voltage of the 24V 4.5 amp(108) ...
5
votes
4answers
250 views

Arduino Uno R3: Directly supply regulated 5V to 5V pin?

I'd like to use an Arduino Uno R3 battery powered a datalogger. I want do supply it directly with a Step-Up regulated 5V rechargable battery powersource at power ...
2
votes
2answers
119 views

Power Electronics for 3.3v or lower MSP430 + 10v sensor

After asking around I realized that switching regulators should be used to regulate the power going to the MSP430. I'm wondering (I'm not very informed in the topic of power electronics) how can I ...
2
votes
2answers
134 views

DC-DC Converter Power Supply

I'm looking to build a motor controller where I want to have consistent motor performance. Normally you have a 6v DC motor and you can plugin a 7.2v battery pack directly and be fine, but the motors ...
1
vote
1answer
81 views

Powering the output side of a voltage regulator?

Would powering the output side of a voltage regulator cause any damage to it? (The ground pin would be attached as well) It will not be normally, but I am making a multi-voltage power converter and ...
3
votes
3answers
145 views

Do I need to use any external parts with a voltage regulator?

I have recently bought a voltage regulator (link, specs, and datasheet below) and I am regulating a AC-to-DC 9v power supply into 5v with as little components as possible. In the datasheet, all of the ...
-1
votes
1answer
73 views

Powering 2 circuits with the same power supply [closed]

I have a casio keyboard that runs off 6v and i plan to run it through a velleman voice changer kit that runs off 9v and then finally through passive tone circuit. I was wondering, what is the best way ...
1
vote
1answer
172 views

10V DC Power Supply help

I've been researching power supply design techniques and information for the last few days and feel like I have a good understanding of how this is to work, but I can't seem to get my simulation to ...
3
votes
3answers
211 views

Power management for a 5V 12A load

I need to deal with a peak load at 5VDC and about 11.25A but I'm not sure how to manage this. I have 5 individual loads of 2.25A and small loads from an MCU and some LEDs all of which should fit into ...
1
vote
3answers
653 views

7805 Regulated DC Power for two devices

I need to create a circuit specifically for powering two devices. These devices include a device, which has to be powered via 5V USB and another device which has to be powered with at least 6V (all ...
0
votes
1answer
298 views

Driving a power transistor with 2sc945

I'm designing a simple 15V to 5V DC voltage feadback mode non SMPS regulator. I'm using E13007E2 power NPN switch mode transistor. And to drive that transistor I'm using C945 another transistor. ...
0
votes
1answer
206 views

Effect of decreasing input voltage of transformer on output voltage

I have designed a device which is controlled with a PIC micro controller.This micro's power is +5 volt. I have used a transformer for converting +220 volt to lower voltage +15 volt. Then a 7805 ...
1
vote
1answer
250 views

Providing power to additional load (PN532 Board)

SETUP: I've put together a board comprised of: 24 V DC Supply voltage connected to 60 Ohm (10 W) Resistor that is in series with a LM7805C (5V Regulator). The LM7805C has a .33 uF cap on the Vin ...
1
vote
2answers
113 views

Switching regulator to power motor

I am trying to power my servomotor only for a short period of time (controlled by my MCU). I have seen I could use a switching regulator (3 pins). The thing is that I am working with really low power. ...
1
vote
4answers
482 views

Can you split power between two voltage regulators?

In order to supply more power to a circuit. can you split the power between 2 voltage regulators, in parallel? Can this overpower one of the Voltage Regulators?
3
votes
6answers
2k views

Why do buck (step-down) switching regulators require an inductor and diode?

So, I understand, at least at a basic level, the method of operation of switching converters, both buck and boost. What puzzles me, though, is why buck converters in particular aren't simpler. Why ...
8
votes
3answers
554 views

Using two regulators to create new ground: How do I calculate needed power?

I'm thinking of using two regulators to create a ±5 V power supply. I'd use a 10 V regulator and a 5 V regulator and use the 5 V regulator's output as ground for the circuit and 10 V regulator's ...
2
votes
2answers
178 views

Accepting a Range of Input Voltage that Straddles Operating Voltage

I want to design a system that runs at 5V and about 350mA. I want that system to accept an input voltage between 1.8V and 15V. How can I achieve that goal with a minimum component cost in my input ...
2
votes
3answers
227 views

Tapped buck converter

I am designing a board which needs 5V and 3.3V rails, at about 1.5A. If I used two buck converters, I would use a lot of board area. So, is there a way to create a multi-output buck converter? I tried ...
2
votes
1answer
248 views

Shortcircuited motorcycle alternator leads to RPM proportional losses?

I've had this puzzle for a couple of years but never been able to figure it out. Regulator manufacturers for typical 3-phase alternators provide the 14.4V by 'shorting' the phases. Obviously this ...
-1
votes
2answers
291 views

Switching regulator question for 9 - 5v in 5v out at 2.5 amps

I have been looking at regulators for some time now, a couple of weeks, and I seem to be looking for something that is fairly non standard. I am taking 9v to 5v and want to out put 5v at a max of ...
5
votes
2answers
767 views

What's the difference between a “Switching Regulator” and a “UBEC”

I want to regulate the voltage from a battery down to 5v to power an Arduino and a Wi-Fi webcam. I’m not too keen on a linear regulator as a lot of power is wasted, so that’s led me to look at ...