Overview:
As the complexity and reliability of communication channels continue to increase, so does the demand and expectations of telecommunications systems. These communication systems are highly dependent on high performance, high clock frequency and data converter devices, and the performance of these devices is highly dependent on the quality of the system power rail. When using a noisy power supply, the clock or converter IC cannot achieve maximum performance. Just a small amount of power supply noise can have a significant negative impact on performance. This article will carefully study a basic LDO topology, find out its main noise source, and give some methods to minimize its output noise.
One of the key parameters that indicate power quality is its noise output. Its common reference is RMS noise measurement or spectral noise density. To achieve the lowest RMS noise or optimal spectral noise characteristics, linear voltage regulators (eg, low-dropout voltage regulators, LDOs) are always superior to switching regulators. This makes it a choice for noise sensitive applications.
Basic LDO Topology A simple linear voltage regulator consists of a basic control loop whose negative feedback is compared to an internal reference to provide a constant voltage—regardless of changes in input voltage, temperature, or load current or disturbance.
Figure 1 shows the basic block diagram of an LDO regulator. The red arrow indicates the negative feedback signal path. The output voltage VOUT is divided by feedback resistors R1 and R2 to provide a feedback voltage VFB. VFB is compared with the reference voltage VREF at the negative input of the error amplifier to provide a gate drive voltage of VGATE. Finally, the error signal drives the output transistor NFET to regulate VOUT. 
Figure 1 LDO negative feedback loop
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Cosmetic Instrument Vibration Motor
Cosmetic Instrument Vibration Motor Mainly used in cosmetic instrument, such as instrument, cleansing essence introducing vibration meter, wash a face, facial massage, hairdressing instrument, etc.
Operating temperature range:
Cosmetic Instrument Vibration Motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a Cosmetic Instrument Vibration Motoris used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
Cosmetic Instrument Vibration Motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
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