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# Ripple And Voltage

218 Threads found on edaboard.com: Ripple And Voltage

## Understanding An Old Analog PSU Design

I have recently received several power supplies ranging from 8V/5A to 18V/3A and one has fantastically stable output regulation. I have done a bunch of tests and their is almost no measurable ripple and on overload the the current ever rises above the variable set point and the voltage drops (...)

## Effect of DC Supply voltage ripple on LNA Noise figure and Gain

15mVpp ripple for 3.3Vdc supply, I don't think this is the issue for low NF in your case. Using BER to find Thermal Noise is ok, but BER could be affected in an exponential manner by different datarates or by the system bandwidth, so you have to be careful choosing these parameters (e.g. BER doubles, for double of datarate). Usually the Hybrid TV

## Strain gauge and instrumental amplifier

Igru25, You have implemented the classic 3 Op Amp instrementation amplifier. It is very difficult to obtain accurate resistor ratios with this circuit using discrete resistors. Your problem may be that ripple on the 5V excitation to the strain gauge bridge appears as a common mode voltage in the input amplifiers. Because of mismatched resistors

## Buck Boost Ripple Voltage in Discontinuous Conduction Mode

Dear All How can we derive the equation for output ripple voltage in a Buck Boost Converter for Discontinuous Conduction Mode using the area under the diode current waveform and the average current.

## How can I tell if a Traco TEP 2412 DC/Dc converter is working

Sorry, without power, I can't imagine any way of checking the DCDC inverter. If you pull it out of circuit and give it a test supply and suitable resistive dummy loads, checking the output voltage and ripple should be easy. I'm guessing that extracting it may not be easy, but many jobs are like that. (...)

## Problems on three phase rectifier design calculation.............

The size of your capacitor will be dependent on full or half wave bridge, worst case load and allowable ripple. As to limiting inrush current either a SCR bridge or diode bridge is used in conjunction to a current limiting resistor with a bypass, the bypass being energised when the voltage has stabilised to within 20% of full (...)

## LDO after DC/DC switched capacitor stage: line and load reg, what else that matters?

Efficiency, output voltage ripple, line/load response, PSRR, quiescent current.

## boost converter: derivation of equation of its transfer function and efficiency

You must derive with average model. Pls neglect small ripple on voltage. For details, I suggest you reading: Fundamentals of Power Electronics.

## How to convert LDO output noise to PSRR and ripple on LDO input

10MHz noise =100nV/√Hz 50nV/√Hz--> self noise 50nV/√Hz--> noise from LDO input after PSRR rejection Now I want to know how to convert 50nV/√Hz to the max ripple on LDO input Hi vovan, nV/√Hz is a spot noise measure, i.e. it states a certain noise voltage at a given frequ

## a question about buck circuit

A capacitor should be added at the output node of the Buck. In a steady state, the output voltage is constant if voltage ripple is supposed small enough. Then when the switch is turned on, the voltage drop on the inductor is VIN-VO. Here, VIN is the input voltage, and VO is the output (...)

## who has the boost or buck-boost converter specs for any cellphone?

An example for boost: output voltage: 5V, accuracy: +/-2%, current: 500mA, Efficiency>80%, ripple<10mV

## Hysteretic Converter Output Voltage Ripple issue

I'm trying to simulate a purely hysteretic converter in LTSpice (no one-shots used). I used an Op-Amp block w feedback resistors to make a hysteretic comparator, the hysteresis is about 20mV. The OpAmp drives a PMOS and 0.4V shottky is used for the catch-diode. On VOUT there is inductor and cap and feedback resistors provide divided (...)

## Constant Current Boost Converter using LT1172

It depends largely on the ripple you can afford to have on the output of the boost converter. For the LED driver (current controlled), it should not be a problem to allow a higher ripple. The capacitor has mailnly two properties that influences the ripple voltage (current) at the output of the converter: capacitance value (...)

## PLL control voltage issue

All, I have an issue with my PLL locking .. The ripple in my VCO control voltage is non uniform its kind of fluctuating up and down ..B'caz of that my VCO (LC -866MHz .. 1.1547n sec) o/p frequecy is also fluctuating ..i.e. the adjacent cycles of my VCO o/p do not have same clock period slightly varies by 30-50ps in a regular pattern

## TrueRMS to DC Conversion ripple problem?

You're mixing different types of "ripple" respectively interferences in your above posts. The 100 Hz ripple of a RMS circuit is representing normal operation and can be adjusted by scaling the averaging capacitor respectively adding a post filter. The voltage spikes are obviously not originated by the AD736. They look like (...)

## Capacitor ripple current calculation

I have an offline flyback with a 30V secondary voltage and an 8W LED Driver connected to this secondary. The only capacitor on the secondary rail is a 150uF electrolytic capacitor To calculate the AC RMS ripple current in the flyback’s secondary electrolytic capacitor……………. Do I have (...)

## Voltage Drop Alternatives for Analog Power Circuit.

I would like to design Power supply with very stable and low ripple for analog measurement application. For regulation from +15 to +5V, from -15 to -5V 3A, about 3Vx3A voltage drop is needed for too much heat. Please advice me a better alternative for voltage drop under stabilty and (...)

## Flyback SMPS - getting noise at different loads

Hi, I designed an SMPS using fly back configuration. it's in put is 230V ac supply.out put is 24V dc and 4.2 A. We are getting good regulation with ripple voltage of 50mV around. but i am getting noise at different loads.we are not getting any noise at full load.but from no load to 0.5 A noise is coming and also at (...)

## electrolytic cap ripple

Hi, A capacitor is used before a Linear regulator. The input voltage to the capacitor is 12VDc. There is a sinusoidal ripple of 0.5Vrms and 13KHz frequency upon it. I calculated the ripple current using the formual Vrms/Impedance. Impedance is metioned as 0.15ohms at 100Khz,25degC. The ripple current value (...)

## The Inductor and Capacitor of a Simple Buck Converter ?

Perhaps inductor is decided by inductor current (peak level), capacitor is decided by output voltage ripple