Exclusive business features for creative cloud for teams centralized administration tools manage and track both all apps and single app seats from the handy webbased admin console. Shutdown of the uc3842 can be accomplished by two methods. Uc3842 datasheetpdf download fairchild semiconductor. Uc3845b stmicroelectronics high performance current mode. An important notice at the end of this data sheet addresses availability, warranty, changes, use in safetycritical applications, intellectual property matters and other important disclaimers. Uc3842a, uc3843a, uc2842a, uc2843a high performance on. Despite the fact that the uc3842 and the ucc3802 pwm controllers are pinforpin compatible, they are not dropin replacements for each other. Customize layouts and templates with a powerful css and skin editor. The uc3842uc3843uc3844uc3845 are fixed frequencycurrentmode pwm controller.
Refer the datasheet at the end of the page to know more about this ic. Uc3842uc3843uc3844uc3845 smps controller solo electronica. Part ecad model manufacturer description datasheet download buy part. Uc3842 datasheet, uc3842 pdf, uc3842 data sheet, uc3842 manual, uc3842 pdf, uc3842, datenblatt, electronics uc3842, alldatasheet, free, datasheet, datasheets, data. Uc3842 345 provides lowcost currentmode control introduction currentmode control the fundamental challenge of power supply design is to simultaneously realize two conflicting objectives. Uc3842 datasheet, uc3842 pdf, uc3842 data sheet, uc3842 manual, uc3842 pdf.
Current mode pwm controller, uc3842 datasheet, uc3842 circuit, uc3842 data sheet. Unless otherwise stated, these specifications apply for 55c. Uc3842 test circuit electronics repair and technology news. Adobe creative cloud for enterprise to be successful, companies need content velocity. Uc3842b datasheet, uc3842b pdf, uc3842b data sheet, uc3842b manual, uc3842b pdf. Features optimized for offline and to dc converters low start up current download tl3842d8 datasheet pdf texas instruments document. Adobe acrobat reader dc download free pdf viewer for. Also check out the layout diagram at the bottom of the datasheet for a quick start. Uc3842 datasheet, uc3842 pdf, uc3842 data sheet, datasheet, data sheet, pdf.
The uc3842 345 is an integrated pulse width modulator pwm designed with both these objectives in mind. This technique results in improved line regulation, enhanced load response characteristics. Lowstartup current uc3842 and uc3843 can operate to duty cycles approaching 100%. Stmicroelectronics high performance current mode pwm controller,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated. Nxp semiconductors, uc3842, currentmode pwm controller. Adobe robohelp 2019 releasean allnew way to create content. Comparison of the data sheet and simulation performance for the uc384xb series of aei models. The uc2842b and uc2844b have uvlo thresholds of 16v on and 10v off, ideally suited offline applications the corresponding thresholds for the uc2843b and uc2845b are 8. Normally whenever the power fet shorted, chances are very high that the uc3842 pulse width modulation pwm ic may shorted too. The uc3844 and uc3845 can operate with 50% duty cycle. Stmicroelectronics currentmode pwm controller,alldatasheet, datasheet, datasheet search site for. Bipolar power devices require high sustained base current for low vce saturation, and minimum deviation. Smps controller, uc3842 pdf download, uc3842 download, uc3842 down, uc3842 pdf down, uc3842 pdf download, uc3842 datasheets, uc3842 pdf, uc3842 circuit.
Even at 1 khz a cycle is 1 ms or 50 x shorter that the vfb time constant. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference. Smart highside power switch features load dump and reverse battery protection1 clamp of negative voltage at output shortcircuit protection current limitation thermal shutdown diagnostic feedback open load detection in onstate cmos compatible input electrostatic discharge esd protection. Uc3842 mosfet driver uc3842 uc3844 smps power supply uc3844 reference smps uc3845 smps smps circuit diagram uc3842.
Current mode pwm controller july 1995 revised july 2002 2 inv59 electrical characteristics vcc15v, rt10k. Wing shing computer components ka3842amm datasheet pdf. Deliver exceptional help, policy and knowledgebase content with the 2019 release of adobe robohelp. Currentmode pwm controller, uc3842 datasheet, uc3842 circuit, uc3842 data sheet. Fairchild smps controller,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other.
Uc3842 datasheet, uc3842 fairchild semiconductor current mode pwm controller datasheet, buy uc3842. Uc3842 mosfet driver uc3842 uc3844 smps power supply uc3844 reference smps uc3845 smps smps. Uc3842 application note an1272 1991 dec 5 v7 10v v6 sl01096 figure 9. Since you have to rewind your transformer anyway you can choose the feedback winding to have the same output voltage, so you probably will not need to change the comparator input values. When the power switch is turned on, the input voltage is directly connected to the input of the l. Oscillator timing capacitorct ischarged fromvref 5 v throughrt, and discharged by an internalcurrent source.
Dc converter applications offering the designer a cost. An832 application note l4981a synchronization by c. The uc3842 uses cycle by cycle current limiting for end of cycle control here from q1s via r3 to. Full datasheet uc3845b manufactirer stmicroelectronics, pwm power supply archive 1. Dc converter applications with minimal external components. Uc3845 throughout the text, the uc3842 part number. Parameter symbol uf4001 uf4002 uf4003 uf4004 uf4005 uf4006 uf4007 unit maximum repetitive peak reverse voltage. The datasheet recommends a value of between 470pf to 4.
Full datasheet uc1843 manufactirer ti, pwm controllers archive 1. The unloaded ringdown will be around 200pf from q6 coss and reflected equivalent d12d14 cjo and 2. They are specially designed for offline and dc to dc converter. Onchip memory in the mc9s08fl16 series of mcus consists of ram, flash program memory for nonvolatile data storage, plus io and controlstatus registers. Philips, alldatasheet, datasheet, datasheet search site for electronic components. Creative business solutions adobe creative cloud for teams. Acrobat pro is the complete pdf solution for working anywhere. Therefore, an external driver is required for high current bipolar power devices.
Adobe acrobat pro dc makes your job easier every day with the trusted pdf converter. Your team can share assets across apps and devices with creative cloud libraries. Currentmode pwm controller uc3842 august 31, 1994 1100 8530614 721 description the uc3842 is available in an 8pin minidip the necessary features to implement offline, fixedfrequency currentmode control schemes with a minimal external parts count. Ti, alldatasheet, datasheet, datasheet search site for electronic components and. For isense you can adapt the current measuring resistor if necessary. For free without registration news articles biblio circuits datasheets. How to easily make your own uc3842 pwm ic tester if you have been repairing switch mode power supplies smps, im sure you have definitely come across the famous uc3842 pulse width. The ucx84x series of control integrated circuits provide the features that are necessary to implement offline or dctodc fixedfrequency currentmode control schemes, with a minimum number of external components. No change to the reference voltage components r and c at pin 8. The uc3842 and uc3843 can operate within 100% duty cycle. Uc1843 ti current mode pwm controller, pwm controllers. Uc3842 datasheet, uc3842 datasheets, uc3842 pdf, uc3842 circuit. High performance current mode controllers the uc3842b, uc3843b series are high performance fixed frequency current mode controllers. Differences between members of this family are the undervoltage lockout thresholds and maximum duty cycle ranges.
Uc3842345 current mode pwm controller features optimized for offline and dc to dc converters low start up current uc3842 datasheet for more info regarding design. The ka3842a are fixe frequency currentmode pwm controller. Uc3842b datasheet, uc3842b pdf, uc3842b data sheet, uc3842b manual, uc3842b pdf, uc3842b, datenblatt, electronics uc3842b, alldatasheet, free, datasheet, datasheets. Uc3842 345b model performance comparison parameter condition data sheet uc184243 uc184445 reference output voltage 1ma 5v 4. Electronic manufacturer, part no, datasheet, electronics description. Uc3845 12v 24v 3a electronics forum circuits, projects. Aug 27, 2007 uc3842 ic can be easily found in most of the electronic equipment switching power supply. Adobe extension manager cc easily install and manage extensions. Stmicroelectronics high performance current mode pwm controller,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Oscillator theuc3842 oscillator is programmedas shown in figure7a. Uc3842 provides lowcost currentmode control the fundamental challenge of power supply design is to simultaneously realize two conflicting objectives. With adobe s lws, you can run reports, track order history, access serial numbers, and download. Uc3843 pwm controller ic pinout, features, equivalent.
The transformer should have a primary inductance of l vin 2ipkfosc, or about 2. The uc3842 and uc3844 have uvlo thresholds of 16v on and 10v off. Select the part name and then you can download the datasheet in. The uc3842 is an integrated pulse width modulator pwm designed with both these objectives in mind. Either method causes the output of the pwm comparator to be high refer to block diagram. Extendscript toolkit cc add script to your creative apps. Adragna devices description in most of, provided with io sync. Uc3842 single ended 500khz current mode pwm controller. Single ended 500khz current mode pwm controller with 16v10v uvlo 100% duty cycle, 0c to 70c datasheet. Aac142, aac143, aac242, aac243, aac1042, aac1043, aac1042 and aac2043 current mode pwm controller charlie coleman asic advantage august, 2008 document aaan0004 aai, sept.
Features optimized for offline and to dc converters low start up current uc3842 is probably running at the 10 khz frequency. Select the part name and then you can download the datasheet. Download free adobe acrobat reader dc software for your windows, mac os and android devices to view, print, and comment on pdf documents. Archived desktop apps available for download but no longer developed or updated by adobe. Publish content as responsive html5, pdf, mobile app and much more to serve customers across all touchpoints. Uc3842 pdf, uc3842 description, uc3842 datasheets, uc3842. Mode pwm controller the ka3842a are fixe frequency currentmode pwm controller.