The lowside gatetrivet output can be configured to automatically switch on during the pwm off time, thereby acting as a synchronous rectifier. Ncp4303 secondary side synchronous rectification driver for. Infineons synchronous rectification sr controller family ir1161l and ir11688s for switch mode power supply smps meets the new 2016 standards set forth by the u. The combination of controller and mosfet emulates a nearideal diode rectifier. It provides two high current gate drive outputs, each capable of driving one or more nchannel lowside power mosfets. Regulation output ensures fast turn off speed and avoids secondary fet still being turned on when primary fet is turned on, making it possible to be used in ccm mode. Stsr2cdtr datasheet forward synchronous rectifiers. The tea2095tte is a new synchronous rectifier sr controller ic for switchedmode power supplies. The controller enables high efficiency designs for flyback, quasi resonant flyback and llc topologies. Whereas normal semiconductor diodes have a roughly fixed voltage drop of around 0. Synchronous rectifier controller replaces schottky diode.
Synchronous rectifier smart driver for llc resonant converters. Highly integration usb pd controller with synchronous. Stsr2cdtr datasheet forward synchronous rectifiers smart. Synchronous rectifiers llc topology 8 mps has the leading secondary synchronous rectifier technology.
A significant power saving can be achieved with the elaborate scheme especially for high current output converter, mosfet will generates less heat and surface mounted mosfet can be used instead of through hole component. The highly integrated nature of this secondaryside mosfet driver means that engineers will need few additional. The csd43301q5m nexfet smart synchronous rectifier is a highly optimized design for secondary synchronous rectification in a high power high density dcdc converter. In view of the rather high voltage levels at the output of the pulse transformer, a special highvoltage smartpower ic technology is needed. The sip11203 synchronous rectifier driver works with the si9222 primary. Thanks to its versatility, it can be used in various topologies such as flyback, forward and half bridge resonant llc. Rectifier is a highly optimized design for secondary integrated fet driver synchronous rectification in a high power high density max rated current 80a dcdc converter. The apr348 is capable of driving the external mosfet in both highside and lowside secondaryside synchronousrectifier configurations. Synchronous rectifier smart driver for flyback, stsr30 datasheet, stsr30 circuit, stsr30 data sheet. The controller enables high efficiency designs for flyback, quasiresonant flyback, and llc topologies. The ic turns the mosfets off before the switching current goes negative. Synchronous rectifier sr is widely used in llc resonant converter to reduce the conduction loss. The srk2000a smart driver implements a control scheme specific to secondary side synchronous rectification in llc resonant converters that use a transformer with center tap secondary winding for full wave rectification.
From a synchronizing clock input, withdrawn on the secondary side of the isolation transformer, the ic generates a driving signal with set dead times with. The ncp4303ab is a full featured controller and driver tailored to control synchronous rectifier circuitry in switch mode power supplies. It provides two high current gate drive outputs, each capable of driving one or more nchannel power mosfets. Ucc24610 secondary side synchronous rectifier controller. A synchronous rectifier for isolated forward dcdc converters. Synchronous rectifiers smart driver for flyback, stsr3 datasheet, stsr3 circuit, stsr3 data sheet. Nexfet smart synchronous rectifier 1features description the csd43301q5m nexfet smart synchronous 2 typical ron of 0. Diodes incorporated announced the introduction of the apr348 secondaryside, multimode synchronous rectification mosfet driver, designed for acdc rectification circuits in general consumer applications, notebooks, and usb adapters. The iw671 secondaryside synchronous rectifier controller complements several of dialogs primaryside controllers to deliver the high efficiency needed for high power density power supplies and power adapters. Sp6039 high performance synchronous rectifier driver 20171106 v1 page 2 typical applcation circuit pin description pin symbol description 1 pred by connecting a resistor to ground to set the dead time. Mosfet driver for synchronous rectification supports.
Drain voltage threshold setting for synchronous rectifier mosfet turnoff. Both ics also allow control of the discharge rate of the synchronous rectifier driver outputs during. The ic can control one or more paralleled n mosfets to emulate the behavior of schottky diode rectifiers. This solution directly reduces power dissipation of the rectifier. Synchronous rectifier article about synchronous rectifier.
Ir1161l and ir11688s synchronous rectification controller for smps infineons synchronous rectification sr controller family ir1161l and ir11688s for switch mode power supply smps meets the new 2016 standards set forth by the u. Stmicroelectronics stsr2 smart driver ic for synchronous rectifiers contains specialized control circuitry to let designers take advantage of the lower conduction losses offered by mosfets and boost the efficiency of their power c. The unit features a 26 ns turnoff propagation delay. Select a syncronous rectifier controller or driver using a variety of parameters and specifications. Ncp4303 secondary side synchronous rectification driver. Synchronous rectifier reduces conduction loss in llc. This is information on a product in full production. This product integrates the driver high density son 5mm.
On semiconductors ncp43080 is a synchronous rectifier controller for switch mode power supplies. Secondary side synchronous rectification driver for high efficiency smps topologies the ncp4303ab is a full featured controller and driver tailored to control synchronous rectification circuitry in switch mode power supplies. Texas instruments ucc24630 synchronous rectifier controller is a highperformance controller and driver for nchannel mosfet power devices used for secondaryside synchronous rectification sr. The mp6925a from monolithic power systems is a dual, fast turnoff, intelligent rectifier for synchronous rectification in llc resonant converters.
The circuit has a novel way of operation, which ensures fast turnoff of the synchronous rectifier switch. Synchronous rectifier driver with power updown control. The semiconductor diodes are replaced with active switching elements. Flyback synchronous rectifier driver delivers 10a output. Smart secondary side driver ic designed to drive nchannel mosfets used as synchronous rectifiers in isolated flyback converters. Based on precise system requirements and constraints, we chose the i3t80 smartpower technology from on semiconductor, which is an. Externally adjustable minimum offtime and ontime blanking periods provide flexibility to drive various mosfet package types and pcb layout. This green rectifier controller is a highperformance controller and driver for standard and logiclevel nchannel mosfet power devices used for lowvoltage secondaryside synchronous rectification.
Based on precise system requirements and constraints, we chose the i3t80 smart power technology from on semiconductor, which is an. Builtin synchronous rectifier controller and driver. The greenchip sr is a synchronous rectifier controller ic. International rectifier ir1167aspbf smart secondary. Synchronous rectifier smart driver for llc and resonant converters. Doe and eu coc demanding higher efficiency from external power supplies. V in would be the voltage from the transformers output. The stprdc01 smart driver implements a control scheme specific to secondaryside synchronous rectification in stvcotbased resonant nonresonant converters. Replacement of a schottky diode output rectifier with the ir11688 combined with a pair of correctly selected high performance mosfets, provides significantly lower power dissipation and efficiency improvement. May 2017docid17811 rev 4119srk2000synchronous rectifier smart driver for llc resonant convertersdatasheet production datafeatures secondaryside synchronous rectifier datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. Power mosfets application note 833 switching analysis of synchronous rectifier mosfets with phaseshifted fullbridge converter and current doubler application note document number. Mosfet driver for synchronous rectification supports ccm, dcm, and qr operation february 7, 2020 christa paul diodes announced the introduction of the apr348 secondaryside, multimode synchronous rectification mosfet driver, designed for acdc rectification circuits in general consumer applications, notebooks, and usb adapters.
Ir1167aspbf smart secondary side driver ic designed to drive nchannel mosfets used as synchronous rectifiers in isolated flyback converters. We support our customers to meet design and performance goals through a wide portfolio of power devices including. The strg02 smart driver implements a control scheme specific to secondaryside synchronous rectification in stvcot based resonant converters. Stmicroelectronics, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Synchronous rectifiers are also known as active rectifiers and they are used to improve the efficiency of diode rectifier circuits. On semiconductor offers the ncp81178, a secondaryside synchronous rectifier driver. The ic drives two nchannel mosfets and regulates their forward voltage drop to vfwd about 45mv. A feature of the a3946 is the flexibility of the two input these can either be tied together to allow for a single pwm input signal, or they can be driven independently to provide direct control over the highside and lowside gate drive outputs. Apr 18, 2020 diodes incorporated announced the introduction of the apr348 secondaryside, multimode synchronous rectification mosfet driver, designed for acdc rectification circuits in general consumer applications, notebooks, and usb adapters. Linear technologys lt3809 flyback secondaryside synchronous rectifier driver replaces the output diode forwardvoltage drop with the rdson of an external nchannel mosfet, thus reducing the. In addition, the pcb footprint has been optimized to help reduce design time and simplify the completion of the overall system design. The smart driver as set forth in claim 17, wherein a parasitic diode is coupled between the source of the synchronous rectifier fet and the drain of the synchronous rectifier fet, when the parasitic diode is on, the drain signal is negative.
The combination of a controller and mosfet emulates a nearideal diode rectifier. Builtin synchronous rectifier controller and driver builtin charge pump for a wide v dd operation range of 3v to 21v builtin shunt regulators for programmable constantvoltage and constantcurrent control builtin 10bit analogtodigital converter adc programmable cable compensation bld pin for quick discharge of output. Possibility to operate in discontinuous mode description stsr2p smart driver ic provides two complementary high current outputs to drive power mosfets. Ucc24630 synchronous rectifier controller ti mouser. Synchronous rectifier smart driver stmicroelectronics. Us8067973b2 driver for a flyback converter using a. The basic concept behind the synchronous rectifier driver is shown in figure 2. Stsr30 smart driver ic provides a high current outputs to properly drive secondary power mosfets used as synchronous rectifier in low output voltage, high efficiency flyback converters.
This product integrates the driver ic and an ultra low r on power mosfet to complete the synchronous rectification function. In view of the rather high voltage levels at the output of the pulse transformer, a special highvoltage smart power ic technology is needed. Battery management ics 469 battery authentication ics 5 battery charger ics 267 battery fuel gauges 114. The ir11688 based smart synchronous rectifier offers significant efficiency improvement in resonant converters over the full load range. Fast turnoff, ccmdcm compatible dualllc synchronous. It is applicable to both highside and lowside implementations. Synchronous rectifier sr controllers products power. Ir11682 is a dual smart secondaryside rectifier driver ic designed to drive two nchannel power mosfets used as synchronous rectifiers in resonant converter applications. Smalloutline synchronous rectification mosfet driver for offline power adapters from diodes incorporated. Because of its versatility, it can be used in various topologies such as flyback, forward and half bridge resonant llc. Power mosfets application note 833 switching analysis of. Both gate drivers are controlled by the combination of the start input.
During the softstart interval, a gradual rampup of the synchronous rectifier conduction time is provided. Research on key application issues of smart synchronous. However, its difficult to generate the correct drive signals for the synchronous mosfets since it requires knowledge of when the primaryside mosfets will turn on or off. The chip also provides prebias protection, overvoltage protection, soft start and soft stop for the secondaryside mosfets. Increasing demands for higher power density, smaller size, more portability and more flexible systems spur the smps industry to continuously design new generations of acdc power supplies.
The apr348 from diodes incorporated is designed to drive external mosfets in a wide range of secondaryside synchronousrectifier applications. Synchronous rectifier smart driver for llc resonant converters datasheet production data features secondary side synchro nous rectifier controller optimized for llc resonant converters protection against current reversal safe management of load transient, light load and startup condition matched turnoff thresholds. Synchronous rectification ics infineon technologies. Build your own lowcost driver for a synchronous rectifier. Diodes incorporated releases new mosfet driver for. Switching to synchronous rectification delivers efficiency gains in offline power converters. Ir1161l and ir11688s synchronous rectification controller for smps. Synchronous rectification can improve the efficiency of halfbridge converters like those used in eighth brick and sixteenth brick dcdc converters. Using smart synchronous rectifier driver integrated circuits ics is another option that can be employed to reduce the conduction losses of llc resonant converters 12. The ic is dedicated to properly drive secondary synchronous rectifiers in medium power, low output voltage, high efficiency forward converters. Synchronous rectifier reduces conduction loss in llc resonant. It is capable of driving a synchronous rectifier switch in a switched mode power supply smps. The apr348 is capable of driving the external mosfet in both highside and lowside secondaryside synchronous rectifier configurations.
The sip11203 synchronous rectifier driver works with the si9222 primaryside halfbridge controller to coordinate turnon and off of the secondaryside synchronous mosfets with that of the primaryside mosfets. Synchronous rectification mosfet driver supports ccm, dcm. Analysis and design of sr driver circuit for llc dcdc. Active rectification, or synchronous rectification, is a technique for improving the efficiency of rectification by replacing diodes with actively controlled switches, usually power mosfets or power bjts.
1412 309 486 658 768 1267 1412 270 1066 836 1357 374 509 545 450 1233 385 1208 1123 876 1171 1276 1307 107 450 907 1512 1302 714 835 1120 1101 230 1065 1394 1227 652 287 1141 715 401 895 419 523 761 11 522