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# Ripple And Voltage

218 Threads found on edaboard.com: Ripple And Voltage

## Just made an LM1875 amplifier. Having problems with humming

I'm missing a systematical approach in narrowing down the hum source. There are different ways hum can enter an audio amplifier: - unshielded high impednace nodes by capacitive coupling - voltage drops on ground lines and ground loops, in general unsuitable ground wiring - supply voltage ripple in combination with (...)

## Trying to generate electricity..pls help

Honda have small silent portable generators with small diesel/gasoline engine, alternators, batteries, and inverter inside. Role of battery is just to stabilize voltage and remove ripple in voltage on input section of inverter.

## What is Difference between in Ripple voltage and Droop voltage in the power supply ?

Then which frequency we consider as ripple frequency here ? I smell a somehow scholastic discussion. In case of doubt, any AC voltage superimposed to a DC supply might be considered as ripple, whatever causes it.

## Voltage doubler disadvantages

The bridge (or Greinacher) type qualifies as a full wave voltage doubler. Also the Cockcroft-Walton type. Full wave refers to the fact that the load capacitor receives a charge during both the positive and negative halves of the AC supply cycle. Hence this excludes the Villard doubler. Full-wave has less ripple voltage (...)

## Frequency Calculation for Boost Converter

Hello Everyone, I am trying to build a Step-Up Converter and have a few questions. I basically have a 3v supply voltage and want to step up to 5 volts @800mA 1) Can the PWM be substituted with a momentary switch? 2) How does one calculate ripple voltage? 3) How do u calculate the frequency? 4) What should (...)

## role of load current specfication in the design of LDO

The current is two corners of your design "box". You must meet dropout voltage at the max current, min line, with enough headroom in pocket that you don't get unstable or lose ripple rejection, etc. and there will be some min current in the pass device, which needs somewhere to go at high temp, max line, the same loop linearity concern (...)

## why is that every row should end with endcap

surge currents can add up to ground shift noise and result in false data. Lowering the the voltage ripple is needed for most logic with noise suppression caps. Some high power logic like STTL need 1 cap per chip.

## Standard books on DC-DC converter design

Pulse-width Modulated DC-DC Power Converters Marian K. Kazimierczuk The book provides an in-depth presentation of topologies of PWM DC-DC power converters, voltage- and current-mode control of PWM DC?DC power converters, considers power losses in all components, device stresses, output voltage ripple, converter efficiency (...)

## about 100HZ output ripple voltage of LLC half-bridge.

Not a very clear question. I guess, the 100 Hz ripple will be present in the DC bus voltage and not particularly caused by the half-bridge converter? Then you would either try to reduce it by voltage feedback or possibly bus voltage feed forward.

## rule of thumb peak to peak input ripple amplitude

It matters what frequency the ripple is at, and what the PSRR (ripple rejection) of the converter is.

## 2 power supply LED power indicator

As :pH has already pointed out... we have no idea what could be the difference between Vbatt and Vpwr. For instance, if Vbatt and Vpwr have almost the same dc voltage and Vpwr has very low ripple then you will need using the two non-connected terminals of the DTDP switch. Kerim

## What is ESR of electrolytic capacitor at 40 degrees Centigrade?

You cannot guarantee operation with this capacitor. The ESR is not specified and will be affected by temperature and aging . You do not want to operate with high ripple currents more than 1/3 the rated voltage otherwise temperature rise must be measured. The only spec given is 143mA so you must derate this if operating (...)

## Difference between PWM and normal supply

Do you understand that the device you are powering usually does not 'see' the PWM waveform, but instead sees a continuous voltage? Perhaps with a little ripple at the PWM frequency. As mentioned, such a power supply uses a low pass filter (at its simplest, think of a reservoir capacitor like in an AC-transformer power supply). So, the (...)

## Choosing ceramic capacitor - I RMS rating

Some points are completely unclear in your post, respectively sound confused. Its very unlikely that a 0.01uF decoupling capacitor will carry considerable ripple current in a 3V supply. What's the total output capacitance, switching frequency and expected ripple voltage? Current rating can be a problem with large (...)

## Why high voltage supply rail for class D amplifier?

40 V would be the minimum supply voltage for an ideal class-D amplifier with 100 W power. There are various reasons to provide a margin, e.g. transistor and inductor losses, supply ripple and dynamical variations, keeping a minimal PWM duty cycle to avoid additional distortions, ... So 50 V would be reasonable minimum (...)

## coupled choke and ripple voltage

I'm really not sure how to interpret the article's claims. They don't clarify what "phase ripple" even is (ripple voltage, current, or B? combined at the output, or in each winding?). and they don't justify their claims with any hard numbers, or even clarify exactly what kind of losses are decreased with coupled (...)

## Best Output ripple measurment for switcher

The 50 ohm is better because the scope probe's high impedance makes it an antenna and it picks up radiated noise as well as voltage ripple. If the 50 ohm termination is too much load for power supply then the probe can be decoupled with a large ceramic or mica capacitor in series. However... the "damper" effect of the 50 ohm resistor can (...)

## charger nokia replace DC power for PIC16F628A

can i use a nokia charger phone (5V 200mA) to fed pic16F You must try, sometimes phone chargers are very bad switching power supply with high ripple voltage, which will reflect on your circuit parts. Try with adding some capacitor and make filters.

## single phase half bridge inverter

A typical specification will read : Input voltage 5 - 24 VDC. Output voltage 12 VDC @ 5 Amp (max) 5 mV ripple : Galvanic isolated ...... You need to understand the need before you can start to develop the solution

## Capacitor Ripple current rating

If I get a cap that can handle 10A at 400V doesn't mean it can do that at 24V right? Q=CV ?? Current rating is voltage independent. As explained. it's a matter of ESR rather than charge. It' however frequency dependent to some extent. Your question seems to suggest a high power and high frequency switching converter. You're prob