Smps Ic

[kiran]

hi,
any one please know me N70 SMPS ic , 6600 SMPS ic both are same ?

[meo786pk]

Can any member give me the information about What is SMPS standard for? What is their function?

Thanks in advance.

Muhammad Afzal Meo

[linekbp]

nice thread , good start , let masters help us out, ar smps ics all same as key pad and display ones?

[reji]

SMPS stands for "Switch Mode Power Supply".only difference between 6600 SMPS IC and N70 SMPS IC is the Output voltages,

N70 IC -1.4v
6600 IC -1.8v.

[abu osama]

Originally Posted by reji

SMPS stands for "Switch Mode Power Supply".only difference between 6600 SMPS IC and N70 SMPS IC is the Output voltages,

N70 IC -1.4v
6600 IC -1.8v.

yes this good help from reji ....smps 6600 not same for n70
n70+6680+6630+n90 both same
6600+7610+6670 both same


abu osama
ALFAL

[HUM]

nice sharing....! very useful info.

[meo786pk]

Thanks man, but sir what is the function of Switch mode power supply.



Muhammad Afzal Meo

Originally Posted by reji

SMPS stands for "Switch Mode Power Supply".only difference between 6600 SMPS IC and N70 SMPS IC is the Output voltages,

N70 IC -1.4v
6600 IC -1.8v.

[reji]

Originally Posted by meo786pk

Thanks man, but sir what is the function of Switch mode power supply.



Muhammad Afzal Meo

http://en.wikipedia.org/wiki/Switched_mode_power_supply

[xtremeburaq]

see the pin configuration between the two .

[garson_123]

thank you very much and we want more

[rez7am]

plz explain what is smps ic? what is its function in phone?

[reji]

Originally Posted by rez7am

plz explain what is smps ic? what is its function in phone?

CPU core needs a very stable, constant voltage. as u know the battery voltage may vary from 3.5v to 4v so the core voltage supplies by this SMPS IC.

[..::Mr_Fone::..]

Switched-mode power supply
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(Redirected from Switched mode power supply)
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A switched-mode power supply, switch-mode power supply, or SMPS, is an electronic power supply unit (PSU) that incorporates a switching regulator — an internal control circuit that switches power transistors (such as MOSFETs) rapidly on and off in order to stabilize the output voltage or current. Switching regulators are used as replacements for the linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated and their switching currents can cause noise problems if not carefully suppressed. As with any offline electronic systems employing peak-hold AC-DC conversion, simple SMPS designs may have a poor power factor. The power output to cost crossover point between SMPS and linear regulating alternatives has been falling since the early 1980s as SMPS technology was developed and integrated into dedicated silicon chips. In early 2006 even very low power linear regulators became more expensive than SMPS when the cost of copper and iron used in the transformers increased abruptly on world markets.

SMPS can also be classified into four types according to the input and output waveforms, as follows.

* AC in, DC out: rectifier, off-line converter
* DC in, DC out: voltage converter, or current converter, or DC to DC converter
* AC in, AC out: frequency changer, cycloconverter
* DC in, AC out: inverter

AC and DC are abbreviations for alternating current and direct current.


Contents
[hide]

* 1 SMPS and linear power supply comparison
* 2 How an SMPS works
o 2.1 Input rectifier stage
o 2.2 Inverter stage
o 2.3 Voltage converter and output rectifier
o 2.4 Regulation
* 3 Power factor
* 4 Types
* 5 Applications
* 6 See also
* 7 External articles
* 8 Book References

[..::Mr_Fone::..]

SMPS and linear power supply comparison
There are two main types of regulated power supplies available: SMPS and Linear. The reasons for choosing one type or the other can be summarized as follows.

* Size and weight — Linear power supplies use a transformer operating at the mains frequency of 50/60 Hz. This low-frequency transformer is several times larger and heavier than a corresponding transformer in an SMPS, which runs at typical frequencies of 50 kHz to 1 MHz.
* Output voltage — Linear power supplies regulate the output by using a higher voltage in the initial stages and then expending some of it as heat to produce a lower, regulated voltage. This voltage drop is necessary and can not be eliminated by improving the design, even in theory. SMPSs can produce output voltages which are lower than the input voltage, higher than the input voltage and even negative to the input voltage, making them versatile and better suited for widely variable input voltages.
* Efficiency, heat, and power dissipation — A linear supply regulates the output voltage or current by expending excess power as heat, which is inefficient. A regulated SMPS will regulate the output using duty cycle control, which draws only the power required by the load. In all SMPS topologies, the transistors are always switched fully on or fully off. Thus, ideally, an SMPS is 100% efficient. The only heat generated is in the non-ideal aspects of the components. Switching losses in the transistors, on-resistance of the switching transistors, equivalent series resistance in the inductor and capacitors, and rectifier voltage drop will lower the SMPS efficiency. However, by optimizing SMPS design, the amount of power loss and heat can be minimized. A good design can have an efficiency of 95%.
* Complexity — A linear regulator ultimately consists of a power transistor, voltage regulating IC and a noise filtering capacitor. An SMPS typically contains a controller IC, one or several power transistors and diodes as well as power transformer, inductor and filter capacitors. Multiple voltages can be generated by one transformer core. For this an SMPS has to use duty cycle control. Both need a careful selection of their transformers. Due to the high operating frequencies in SMPS, the stray inductance and capacitance of the printed circuit board traces become important.
* Radio frequency interference — The current in a SMPS is switched on and off sharply, and contains high frequency spectral components. Long wires between the components may reduce the high frequency filter efficiency provided by the capacitors at the inlet and outlet. This high-frequency current can generate undesirable electromagnetic interference. EMI filters and RF shielding are needed to reduce the disruptive interference. Linear PSUs generally do not produce interference, and are used to supply power where radio interference must not occur.
* Electronic noise at the output terminals — Inexpensive linear PSUs with poor regulation may experience a small AC voltage "riding on" the DC output at twice mains frequency (100/120 Hz). These "ripples" are usually on the order of millivolts, and can be suppressed with larger filter capacitors or better voltage regulators. This small AC voltage can cause problems or interference in some circuits; for example, analog security cameras powered by switching power supplies may have unexpected brightness ripples or other banded distortions in the video they produce. Quality linear PSUs will suppress ripples much better. SMPS usually do not exhibit ripple at the power-line frequency, but do have generally noisier outputs than linear PSUs. The noise is usually correlated with the SMPS switching frequency.
* Acoustic noise — Linear PSUs typically give off a faint, low frequency hum at mains frequency, but this is seldom audible (vibration of windings in the transformer is responsible). SMPSs, with their much higher operating frequencies, are not usually audible to humans (unless they have a fan, in the case of most computer SMPSs). A malfunctioning SMPS may generate high-pitched sounds, since they do in fact generate acoustic noise at the oscillator frequency.
* Power factor — Linear PSUs have low power factors because current is drawn from the mains at the peaks of the voltage sinusoid. The current drawn by simple SMPS is uncorrelated to the the supply's input voltage waveform, so the early SMPS designs have a mediocre power factor as well and their use in personal computers and compact fluorescent lamps present a growing problem for power distribution. A SMPS with Power factor correction (PFC) can reduce this problem greatly, and are required by some electric regulation authorities(European in particular).
* Electronic noise at the input terminals — In a similar fashion, very low cost SMPS may couple electrical switching noise back onto the mains power line. Linear PSUs rarely do this.

[..::Mr_Fone::..]

Input rectifier stage


If the SMPS has an AC input, then its first job is to convert the input to DC. This is called rectification. The rectifier circuit can be configured as a voltage doubler by the addition of a switch operated either manually or automatically. This is a feature of larger supplies to permit operation from nominally 120 volt or 240 volt supplies. The rectifier produces an unregulated DC voltage which is then sent to a large filter capacitor. The current drawn from the mains supply by this rectifier circuit occurs in short pulses around the AC voltage peaks. These pulses have significant high frequency energy which reduces the power factor. Special control techniques can be employed by the following SMPS to force the average input current to follow the sinusoidal shape of the AC input voltage thus the designer should try correcting the power factor. A SMPS with a DC input does not require this stage. A SMPS designed for AC input can often be run from a DC supply, as the DC passes through the rectifier stage unchanged. (The user should check the manual before trying this, though most supplies are quite capable of such operation even though no clue is provided in the manual!)
If an input range switch is used, the rectifier stage is usually configured to operate as a voltage doubler when operating on the low voltage (~120 VAC) range and as a straight rectifier when operating on the high voltage (~240 VAC) range. If an input range switch is not used, then a full-wave rectifier is usually used and the downstream inverter stage is simply designed to be flexible enough to accept the wide range of dc voltages that will be produced by the rectifier stage. In higher-power SMPSs, some form of automatic range switching may be used.