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TI introduces the device of power level of digital audio amplifier exceeding 300W power-handling capability in the first batch of every passways

A few days ago, Dezhou instrument claimed to put out two sections of new PurePath Digital

#Power technology #analogue technique #simulation IC #power

C amp; D puts out for the distributed small-scale 48V forward end power

C&DTechnologies has added the products that 1600W48V exported while plugging the power series D1U of forward end at its leading 1U height, redundancy, heat. D1U-W-1600-48-H has adopted and combined the topology proved and structural technology of the power of year of high-density board, maximum to raise space efficiency and make and output collinear power density to reach 70W / cubic inch. The efficiency of D1U-W-1600-48-H is up to 90.6%, the ultimateoutput of 48V primary output is 1600W( 220VAC) ,1200W( 110VAC) . The new D1U products have offered the extremely good space efficiency scheme to 48V distributed power artificer, power density 17.5W / cubic inch. Three D1U-1600-48s can be 19 high in 1U " Form the power system of 4800W in the wide power chassis. Typical application includes the server, stores facility and data Communication / infrastructure such as telecommunications. Except primary output, D1U-W-1600-48-H which accords with RoHS also includes 3.3V or 5V to assist and export. In order to meet the latest application requirement, this power improves reliability and processing control by latest magnetic device technology of plateform. Its function includes N +1 redundancy, flowing, I2C bus line status indication, overvoltage, excessive load of primary output it is protected etc. and too warm. Size of the new power has only 304.8mmx120.7mmx40.6mm, his Built-in: fan has overcome the need of adding external hot management, thus make the customer's application be simplified. Three D1U-W-1600-48-Hs are 19 high in 1U " Receive the systematic power of the total power 4800W in the wide power chassis in parallel. 0& ordm of operating temperature range; C~+50º C. The manager WalterWong of C&DTechnologies product market says: "Except a great deal of characteristic display and overall parameter, D1U-W-1600-48-H it gives 48V to be one piece canonial from the posture scheme in distributed artificer of power. Thus development and verification time to help to be shortened, and and the power on some markets customized the scheme to save the cost at present. "

#Measure #test #simulation IC #power

ADI serial digital power monitors reduce the cost of power effectively

U.S.A. simulation device Company (AnalogDevices, Inc., ADI) Released a series of power a few days ago " >Digital power monitor, they reducible knife-blade (blade) Server, knife-blade PC and advanced telecommunication calculate the architecture (ATCA) Power requirement and cost for the card, have and solved the heat-dissipating problem. The intersection of ADM1175/6/7/8 and through monitor each the intersection of power and utilization factor of circuit board in the knife-blade structural system in order to meet the intersection of system pair and demand that power raise constantly the series - -Among them part of the reason comes from the increase of the number of internal electrical power supply of the processor. As the increase of processor density in computer and telecommunication equipment certainly will produce the relevant multiple power supply problem. First of all, new device design closely capsulates the single knife-blade structure together, thus increase spent heat and need more heat removal systems, certainly will consume more power electric current. In addition, the new developing knife-blade system needs to increase the power consumption, and the Off-The-Shelf standard is exchanged (AC) The current source can't meet all demands of its. Because of the above-mentioned two respect reasons, the system design engineer needs monitoring effectively and effective control power supply utilization ratio. However, Er early idea machine and telecommunication system can't monitor the power effectively, and can only be expensive to make the discrete solution up, including adopting discrete electric current detector amplifier, analog-digital converter (ADC) And the digital heat plugs the control device. The ADM1175/6/7/8 series products of ADI Company plug control device and electric current detector amplifier in a form on-chip integrated 12bitADC, heat, thus has offered an Integrated high-performance method to design engineer and monitored the power consumption. Compared with available traditional solution, these chips have reduced the system cost by 33% and brought sampling rate up to 10,000 times per second to sample at the same time, and the traditional solution only offers 100 times per second to sample. "Current computer and telecommunication employ required innovative solution in order to meet demand that raise constantly the power, "Product line director PatMeehan of management department speaks the power system of ADI Company. "ADI Company realizes this kind of demand, relies on the expertise of its power management and mastering and developing a series of product to PC and server market, thus can relieve a lot of difficult problems that the knife-blade structure faces. In this case, the design engineer can use these solutions to solve the great inherent power consumption problem in the above-mentioned application now, thus does not need to increase the cost or sacrifice the characteristic to keep the reliability of the system. " About ADM1175/6/7/8 power" >Digital power monitoring device ADM1175, ADM1176, ADM1177 and ADM1178 power " >The digital power monitor includes one and is used for measuring integrated direct current (DC) The power can offer 12bitADC of highest redolution on the current market, heat plugs the control device and electric current detector amplifier to monitor knife-blade server, new developing knife-blade PC and ATCA card. The sampling rate of these chips can be up to for 10,000 times per second, thus have intellectual power management characteristics, clock rate of the control processor that for example can be dynamic. The amplifier can measure the voltage of both ends of the series resistor and pass the outside n channel fet (FET) in the control power supply route Door terminal voltage about limit electric current. This serial devices also include changing and beginning the pin, thus allow a plurality of ADC in the system to sample synchronously, thus can measure all power in order to totally read out the general power utilization ratio immediately. This serial chips can control the mains voltage of 3.3V- 14V. Offer the industrial standard I2C interface to allow the control device to read electric current and voltage data after ADC change. ADM1175, ADM1177 and ADM1178 can offer 4 I2C addresses, and ADM1176 can offer 16 addresses.

#Digital power #consume the electron #simulation IC #power

Reduce the component cost in the high-performance CPU power

The requirements for power of the new processor are higher and higher, fast load step response, rigorous output resistance are limited and the fast output variation is essential. So, it is essential to choose the appropriate control device.

The same control device, different inductance and electric capacity

See the Off-The-Shelf control device at first. To desk calculating machine and some greater notebook computers, the control device of quad-phase with minimum ripple current offers the fastest response for step of load. However, must have enough high switching frequency responds to supporting wink to change with required conversion rate, also need MOSFET to guarantee the low on resistance RDSON and make the high-frequency switching loss minimum.

If need to improve switching frequency, need to increase the bandwidth of the feedback loop of control device in order to offer the quick response enough, but the control device of the large bandwidth may not be steady. If reduce the bandwidth to the existing control device, does not have any meaning when improving switching frequency, because reducing the bandwidth will always limit the cycle and respond to.

The inductance is unable to offer large electric current step, so need large volume capacitor, have raised the cost and strengthened the printed circuit board area like this. And capacitive capacity have upgrade too, use too much electric capacity will enable unable voltage step that response dynamics exported in time of power.

Solve the new control device of the new problem

The new heterogeneous synchronous step-down type control device has solved the above-mentioned problem. Its design size of decrease while the stable feedback loop can be lowering costs under the high-speed condition.

Through compensate properly, a wideband controller may punish the intersection of load and step of maximum, and not shaken. This kind of control device can obtain more electric current from the inductance, very fast to the transient response of the electric current, it can open a plurality of phase places at the same time, increased and can use the electric current and needn't have the additional large capacity in this way.

There is control device which deals with step of large load, the choices of inductance, electric capacity and MOSFET are very simple. Consider the choice of the component first, and then investigate the control device. Choose four phase place in order to meet high the intersection of electric current and demand, every phase place switching loss, ripple, the intersection of output filter and compromising well among the size in switching frequency of 330kHz, but may be a little higher to some control devices.

Pay the utmost attention to the inductance

The choice of the inductance depends on the requirement for exporting the ripple. Caused by ripple current of inductance ripple voltage VRIPPLE, as follows, then

(1)

Choose a inductance, the peak-to-peak value of its ripple current is lower than inductance half of maximum DC current. The ripple current of 11A will produce the output resistance as 7mVPP ripple voltage of 1.0mW; As to the quad-phase VRD power, FSW =330kHz, adopts formula ( 1) Calculate so that L is greater than or equal to 320nH.

It is smaller in line Bob's design if in reality, can adopt smaller inductance. In a lot of control device designs, the inductive D.C. resistance will influence the electric current to measure. The good choice is that DCR is about 1/2- 3/2 of Ro, this will depend on the control device.

Ask the minimum output capacitance

It is useless to only use a pile of large capacity for the output filter of low frequency, need to change VVID dynamically, there must be upper value - power in this way must offer and stipulate the error in time tV as voltage step VV of VERR; Output, need one minimum electric capacity used in the intersection of load and the intersection of step and DIo and maximum of maximum, allow smooth unloading voltage of overshoot under the terms, there must be lower limiting value in this.

Equivalent series resistance (ESR) of the large capacity group Should be smaller than twice of the resistance Ro of pressure drop. If Cxmin ( Minimum) Greater than Cxmax ' Maximum value) ,last VVID step index phase place on it is should minor without being adopted or it is more inductance. In order to have the same output ripple while guaranteeing to adopt the minor inductance, must improve switching frequency.

Suppose Cz =180μ F, finishes 450mV step with 230μ s, overshoot is restricted to 50mV, sets up time error 2.5mV, the range that can obtain large capacitance value Cx is 3.92- 43mF.

Series connection inductance of result (ESL) such as large capacity of final inspection ,In order to guarantee it is low enough in order to limit the high frequency oscillation during the step of load. It must be satisfied:

ESL is less than or equal to Cz

#MOSFET #power technology #industrial control #analogue technique #simulation IC #power

Reduce the component cost in the high-performance CPU power

The same control device, different inductance and electric capacity

Solve the new control device of the new problem

Pay the utmost attention to the inductance

The choice of the inductance depends on the requirement for exporting the ripple. Caused by ripple current of inductance ripple voltage VRIPPLE, as follows, then

(1)

Ask the minimum output capacitance

Suppose Cz =180μ F, finishes 450mV step with 230μ s, overshoot is restricted to 50mV, sets up time error 2.5mV, the range that can obtain large capacitance value Cx is 3.92- 43mF.

ESL is less than or equal to Cz

#MOSFET #power technology #industrial control #analogue technique #simulation IC #power

C amp; D is miniature to sample the dwarf signal tape of hold amplifier to range broadly from 70MHz

C&DTechnologies introduced one a few days ago high-speed, high-performance miniaturely and sampled the hold amplifier. In extensive analog signal processing is employed, the Apparatus dealt with high speed, multiple channel, many things, SHM-50 designed newly offers fast signal and pulse sample-and-hold of high precision.

It is introduced, the bandwidth of SHM-50 dwarf signal is 70MHz, 8 pins miniature DIP offering the hole or surface mounted are capsulated. This product is to include rigorous MOS and keep electric capacity and MOSFET switch configuration on the inner and intact sample hold circuit. Thus have more quick switch speed and extremely good one - 78dB presents Communication number and decays. This product also has interface of one TTL. Use the design of the input amplifier of field effect tube to make 2V one step reach in 40 periods of sampling time

#The amplifier #consume the electron #the new product #simulation IC #power #consume the electron

Maxim introduces amplifier frequently of amplifier 3W stereoscopic sound of earphones

Maxim introduces the audio amplifier MAX9777/MAX9778 of high integration density, the device built-in stereosound 3W is bridged and supported (BTL) Audio amplifier, amplifier of the stereophone, detection circuit of the earphone and inputting the multiplexer at 2:1. MAX9777 adopts I2C interface, and MAX9778 adopts and runs side by side the control interface. Two devices offer miniature, 28 pins (5mmx5mmx0.8mm) TQFN capsulates. MAX9777/MAX9778 employs and optimizes to portable products and low power such as notebook computer, multimedia monitor and DVD player. MAX9777/MAX9778 adopts to supply power from 4.5V to 5.5V form power, offers the industry leading 100dBPSRR, so allow to work in the noisy power, do not need extra linear voltage regulator. 0.002% ultralow THD +N guarantees to amplify the voice signal clean, low and distortedly. There is noise of the patent that has inhibited technology from dispelling power up and shutting off the audible transient jar in the course. The electricity-saving characteristic includes: 10mV low offset voltage (can reduce the direct-flow leakage current of passing the loudspeaker greatly) ,13mA low power electric current and 10μ A shut off the mode. The quite function can be opened or closed and exported rapidly. The earphone measures the state of the automatic detection earphone jack of input, and configure the amplifier correspondingly to the loudspeaker or earphone mode, offer greater design flexibility. For compensate Frequency Response FR of high pitch loudspeaker, limit, Integrated to 2:1 input multiplexer to be easy to choose many kinds of source of sound or the intersection of outside and equalization network. Every function of interface control runs side by side through I2C compatible interface or simple one. MAX9777/MAX9778 adopts high thermal effect, 28 pins QFN to capsulate. Hot to protect until year to offer by complete one two section device, work amount until - last grades of temperature range 40 ℃ to +85 ℃. The trigger price of the device is $1.25 (1000 sheets arise, American F.O.B.) .

#The amplifier #consume the electron #the new product #simulation IC #power #consume the electron

New notebook computer power ME

Traditional notebook computer power framework

The power supply unit of the notebook computer can be divided into two major parts: Lithium ion battery and charging circuit and system feed circuit. Because the notebook computer can't use the alternating current directly, the outside also needs a power adapter, turn the alternating current into the stable direct current through it. After the direct current enters the notebook computer, know to a soldier and divide two-wayly, deliver to the Built-in: DC/DC transducer of the system directly all the way, deal with through voltage transformation, supply power for every unit; Will enter lithium ion battery charge circuit all the way another, to the battery charge of lithium ion. Lithium ion battery adopt four two and or the intersection of 3 bunches and 2 structure combined generally, the voltage needed by it is 9- 16.8V, the voltage that and the power adapter outputs is mostly 19V, in order to give consideration to these two partial different requirements, artificers of the power will limit the input voltage of the notebook computer in 7- 21V soon.

In this way, will produce two questions: The first is that a range of the input voltage is too wide, very apt to reduce efficiency, and increase the systematic calorific power, give and bring the hidden danger systematically. The second is that the required voltage of sub battery of lithium is different from system voltage, while making the designer design the power adapter, want on the peaking generation of the system in addition, charge the power, the systematic power consumption will be promoted.

New power management " >Power management framework

Should solve the problem above, it is unhelpful to only depend on patching up, must have major operation on the structure. For this reason, a lot of companies develop the new power framework. Here, we take OZ875x of O2Micro Company as examples to explain. This serial chips have adopted one kind and is called Cool Charge Topology (CCT) Topological structure. The output voltage that such structural maximum characteristic is the adapter will keep unanimity with the voltage of the lithium ion battery, the framework of its principle is shown as in Fig. 1.

Fig. 1 OZ875x schematic diagram

Key that realize whether battery it manages chips to be can proactive to regulate output voltage of adapter, make same the intersection of output and voltage of 9- 12.6V its, in this way can reduce computer range of input voltage (concrete and topological to meet picture 2) . Certainly, this framework still makes the area of the systematic circuit board be reduced, has reduced the systematic cost. Can be found out from Fig. 2, because of adopting the new design, OZ875x chip can be in order to save two pieces of outside MOSFET systematically. Meanwhile, the reducing that the specifications of external input capacitance and MOSFET are corresponding. Because if the input voltage of the notebook computer is 21V, the input capacitance should have 25V, and MOSFET will have 30V soon. And the new technology has reduced the input voltage of maximum to 12.6V, the requirements for electric capacity and MOSFET have been just reduced correspondingly. The last advantage of this kind of framework is to expand the range of choice to the adapter, managed the chip by the battery to regulate the input voltage of the adapter, we can no longer consider the kind of the adapter.

Fig. 2 OZ875x structure chart

The miscellaneous power chip company is putting out one's own new product too, for example, bq24060 of MAX1533A/MAX1537A of LTC4062 of Linear, MAXIM, TI,etc., because space is limited, are not introduced one by one here.

The energy density of adding the lithium battery of a layer of shelter is very high, this has already brought plentiful vigor systematically, have caused the potential safety hazard systematically again. The notebook computer battery explosive incident that happened not long ago is a very good evidence.

To lithium battery, this link of charging and discharging happens more in the problem, besides excessively charging and excessively discharging, excess current charge, charge and over voltage charge injury in battery too greatly. In the past, the outdated chip paid attention to the control to the temperature, but the change of the temperature was only a image, electric current and master reason of abnormal state of the voltage. Can make sure to genuine provide for a rainy day to the accurate control of the voltage and electric current in the course of charging. Now, the new-type chip has already possessed the electric current and charged function of over voltage of keeping a lookout. Take OZ875x as examples, when the charging voltage is higher than this voltage, it will control external MOSFET to shut off, stop the charging activity of the battery; It also has one to monitor resistance, for the charging current of detect. When the voltage on it exceeds a marginal value, the chip will stop the charging behavior to the battery too too.

Have charger chip which protects the function, in addition, lithium battery autogenous shelter circuit, in this way, can add the dual fail-safe for the notebook computer.

New role of the battery

To power supply circuit of the traditional typological note-book, the choice of the adapter is very rigorous, the power minor adapter will often refuse to charge notebook computer because of undercapacity. But the appearance of the new charger chip solves this problem, take OZ875x as examples (see Fig. 2) ,Because the voltage of the battery and output voltage of the adapter are equal, when the notebook computer needs instantaneous high-power and the adapter can not be satisfied, the battery is known to mains supply automatically; And when the computer no longer needs the electric energy, the adapter will be charged to the battery again. According to this respect, the new charger chip makes the lithium ion battery act a " fire fighter " Role.

Conclusion

To notebook computer, it is very important that the safe and efficient electric energy is supplied, compare processor and chip set developed at full speed, the step of the chip of the power seems to walk haltingly a bit. However, we have already seen the omen of the change, have believed in the near future, the power chip technology will have a qualitative leap too.

#Power management #power technology #analogue technique #simulation IC #power