universal-input/100 w off-line quasi- resonant flyback switching regulator data sheet 28103.32 STR-W6754 sanken power devices from allegro microsystems switching regulators absolute maximum ratings at t a = +25c control supply voltage, v cc . . . . 35 v drain-source voltage, v dss . . . . . . 650 v drain switching current, i d . . . . . 15 a* peak drain switching current, i dm . . . . . . . . . . . . . . . . . . . . . . 15 a single-pulse avalanche energy, e as . . . . . . . . . . . . . . . . . . . 292 mj ocp/bd voltage range, v ocp . . . . . . . . . . . . ?1.5 v to +5 v fb input current, i fb . . . . . . . . 10 ma fb voltage range, v fp ?0.5 v to +9 v package power dissipation, p d control (v cc i cc(on) ) . . . . . . 0.8 w mosfet (v dss i d ) . . . see graph mosfet channel temp., t j . +150c internal frame temp., t f . . . . +115c operating temperature range, t a . . . . . . . . . . . . -20c to +115c storage temperature range, t s . . . . . . . . . . . . -40c to +125c * drain switching current is limited by tem- perature (page 2) and safe operating area (page 5). the STR-W6754 is a quasi-resonant regulator specifically designed to satisfy the requirements for increased integration and reliability in switch-mode power supplies. it incorporates a primary control and drive circuit with an avalanche-rated power mosfet. the regulator exhibits only low-level high-frequency emi noise because of soft switching of the mosfet close to ground (bottom point). a bottom-skip function minimizes an increase of operational frequency during light loads to improve system efficiency over the entire load range. covering the power range from below 160 watts for a 230 vac input, or 100 watts for a universal input (85 to 264 vac), this device can be used in a range of applications, from dvd and vcr players to ac adapters for cellular phones and digital cameras. an auto-standby function, which is internally triggered by sensing on time, reduces power consumption at light load. an externally triggered standby mode reduces the input power further. multiple protections, including the avalanche-energy-guaranteed mosfet, provide high reliability of system design. devices with an increased output power rating are the str-w6756. cycle-by-cycle current limiting, undervoltage lockout with hyster- esis, and overvoltage protection protect the power supply during the normal overload and fault conditions. overvoltage protection is latched after a short delay. the latch may be reset by cycling the input supply. low start-up current and a low-power standby mode selected from the secondary circuit completes a comprehensive suite of features. the STR-W6754 is provided in a fully molded to-220-style flange- mounted, high power, isolated plastic package. features and benefits rugged 650 v avalanche-rated mosfet simplified surge absorption no v dss derating required 0.96 ? maximum r ds(on) two operational modes by automatic switching: quasi-resonant mode for normal operation burst mode for standby operation or light loads automatic or manually triggered burst standby input power <0.1 w at no load low operating current (6 ma typ) ? continued always order by complete part number, e.g., STR-W6754 .
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 2 switching regulators copyright ? 2005 allegro microsystems, inc. functional block diagram features and benefits (cont?d) auto-bias function stable burst operation without generating interference internal off-timer circuit built-in constant-voltage drive multiple protections: pulse-by-pulse overcurrent protection overload protection with auto recovery latching overvoltage protection undervoltage lockout with hysteresis rohs compliant
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator www.allegromicro.com 3 switching regulators electrical characteristics at t a = +25c, v cc = 20 v, voltage measurements are referenced to s/gnd terminal (unless otherwise specified). limits characteristic symbol test conditions min. typ. max. units start-up operation operation start voltage v cc(on) turn-on, v cc = 0 19.9 v 16.3 18.2 19.9 v soft-start operation stop voltage v ss/olp 1.1 1.2 1.4 v soft-start oper. charging current i ss/olp -390 -550 -710 a operation stop voltage v cc(off) turn-off, v cc = 19.9 8.8 v 8.8 9.7 10.6 v circuit current in non-operation i cc(off) v cc = 15 v ? ? 100 a normal operation drain-source breakdown voltage v (br)dss i d = 300 a 650 ? ? v drain leakage current i dss v ds = 650 v ? ? 300 a on-state resistance r ds(on) i d = 1.9 a, t j = +25c ? ? 0.96 ? switching time t f ? ? 400 ns circuit current i cc(on) ? ? 6.0 ma oscillation frequency f osc 19 22 25 khz bottom-skip oper. threshold volt. v ocpbd(bs1) -605 -665 -720 mv v ocpbd(bs2) -385 -435 -485 mv quasi-resonant oper. threshold v ocpbd(th1) 280 400 520 mv v ocpbd(th2) 670 800 930 mv feedback-pin threshold voltage v fb(off) 1.32 1.45 1.58 v feedback-pin current i fb(on) 600 1000 1400 a standby operation standby operation start voltage v cc(s) v cc = 0 12.2 v 10.3 11.1 12.1 v standby oper. start volt. interval v cc 1.10 1.35 1.65 v standby non-operation current i cc(s) v cc = 10.2 v ? 20 56 a feedback-pin current i fb(on) v cc = 10.2 v ? 4.0 14 a feedback-pin threshold voltage v fb(s) v cc = 12.2 v 0.55 1.10 1.50 v minimum on time t on(min) 0.5 0.8 1.2 s continued next page ...
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 4 switching regulators protection operation ovp operation voltage v cc(ovp) turn-off, v cc = 0 29.9 v 25.5 27.7 29.9 v maximum on time t on(max) 27.5 32.5 39.0 s olp operation voltage v ssolp 4.0 4.9 5.8 v olp operation current i ssolp -6.0 -11 -16 a overcurrent detect. threshold volt. v ocpbd(lim) -0.895 -0.940 -0.995 v ocp/bd-pin current i ocpbd -40 -100 -250 a latch holding current i cc(h) v cc = 29.9 v cc(off) ? 0.3 v ? 45 140 ma latch release voltage v cc(l) v cc = 29.9 6 v 6.0 7.2 8.5 v other thermal resistance r jf output junction-to-frame ? ? 1.6 c/w notes: 1. typical data is for design information only. 2. negative current is defined as coming out of (sourcing) the specified device termninal. electrical characteristics at t a = +25c, v cc = 20 v, voltage measurements are referenced to s/gnd terminal (unless otherwise specified). limits characteristic symbol test conditions min. typ. max. units
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator www.allegromicro.com 5 switching regulators avalanche energy is measured at v dd = 99 v, l = 20 mh, i l = 5.1 a. mosfet typical characteristics
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 6 switching regulators mosfet typical characteristics (cont?d) warning ? these devices are designed to be operated at lethal voltages and energy levels. circuit designs that embody these components must conform with applicable safety requirements. precautions must be taken to prevent accidental contact with power-line potentials. do not connect grounded test equipment. the use of an isolation transformer is recommended during circuit development and breadboarding.
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator www.allegromicro.com 7 switching regulators complete product description and applications information is provided in application note 28103.30, series str- w6750 off-line quasi-resonant flyback switching regulators . typical application applications information the products described herein are manufactured in japan by sanken electric co., ltd. for sale by allegro microsystems, inc. sanken and allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. therefore, the user is cautioned to verify that the information in this publication is current before placing any order. when using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users responsibility. although sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. users of sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). their use in any application requiring radiation hardness assurance (e.g., aerospace equipment) is not supported. when considering the use of sanken products in applications where higher reliability is required (transportation equipment and its control systems or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written confirmation of your specifications. the use of sanken products without the written consent of sanken in applications where extremely high reliability is required (aerospace equipment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. the information included herein is believed to be accurate and reliable. application and operation examples described in this publica- tion are given for reference only and sanken and allegro assume no responsibility for any infringement of industrial property rights, intellectual property rights, or any other rights of sanken or allegro or any third party that may result from its use.
STR-W6754 universal-input/100 w off-line quasi- resonant flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 8 switching regulators package dimensions in millimeters product weight: approx. 2.3 g. recommended mounting hardware torque: 0.588 ~ 0.785 nm, 6 ~ 8 kgf cm. recommended silicon grease: dow corning sc102, toshiba yg6260, shin-etsu g746, or equivalent.
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