Tagged Questions

1
vote
2answers
77 views

What is the current limit/saturation of series inductors?

I am currently trying to increase a 12Vdc 30A (from a computer power suppy) to 24Vdc 12A. The circuit I have used is based on a application note for the NCP3063 boost circuit with an external mosfet, ...
0
votes
0answers
36 views

Are there off-the-shelf sources for high-frequency high-current magnetics?

I'm often looking for high-frequency chokes. My typical spec ranges are 500-1000 volts, 10-40 kHz, 5-200 amps. Off-the-shelf chokes in that range are almost non-existent from what I've seen. The ...
4
votes
3answers
393 views

How to choose a inductor for a buck regulator circuit?

I am designing a buck-regulator circuit, with possibly the MAX16974 as the regulator. I have never done such a thing before, and actually not too much analog electronics at all. I got stuck at the ...
9
votes
1answer
1k views

What might be the cause of high pitch sound coming from a switching regulator circuit

We designed a switching regulator circuit using a 1.5Mhz, internal-switch, switching regulator (semtech.com/images/datasheet/sc185.pdf). Vin is 5V, Vout is 3V3. We have an input capacitor (47uf), an ...
11
votes
4answers
1k views

Why do smaller loads require larger inductors in buck regulators?

The MC34063 Application Note lists the equation for calculating minimum inductor size as follows: $$L_{min} = \frac{V_{in} - V_{sat} - V_{out}}{I_{pk}(switch)} t_{on}$$ But this implies that as ...
2
votes
3answers
833 views

LM2596 Voltage Regulation Problem

I am trying to implement a switching voltage regulator from 7.2V to 5V with LM2596 by HTC Korea. Since I don't need an adjustable regulation, I chose typical application circuit from the datasheet ...
0
votes
2answers
864 views

Switching Regulator: How to determine maximum inductor current?

I am trying to design a buck/boost converter with LTC3780 chip from Linear. My spesifications are: Vin = 6 to 32V Vout = 24V at 100mV ripple Ioutmax = 2A Frequency = 300kHz However, in the ...
1
vote
3answers
395 views

Building SMPS using L4960: How does the choice of inductor affect circuit operation?

I've decided to conquer my fear of switched-mode power supplies and build one. Right now, I have a L4960 regulator. Its datasheet recommends use of a 150 $\mu H$ inductor rated at 5 A. My problem is ...
5
votes
2answers
534 views

Choosing output filter inductors for switching power amplifiers

Class D PWM switching power amplifiers use an LC filter at the output to filter out the switching harmonics: Other than the inductance value, what properties are important for this inductor? What ...
7
votes
1answer
2k views

How important is self-resonant frequency for an inductor when used in a fast (~3MHz) buck SMPS?

I'm using the LM2734Z, a 3 MHz buck regulator. It's really fast which means it has a small inductor. One of the things I'm wondering is how important is the self-resonant frequency of the inductor? ...