universal-input/15 w 67 khz flyback switching regulator data sheet 28103.43b str-a6251m sanken power devices from allegro microsystems switching regulators absolute maximum ratings at t a = +25c control supply voltage, v cc . . . . 36 v drain-source voltage, v dss . . . . . . 650 v drain switching current, i d . . . . 2.5 a* peak drain switching current, i dm . . . . . . . . . . . . . . . . . . . . . . 2.5 a single-pulse avalanche energy, e as . . . . . . . . . . . . . . . . . . . . 72 mj s/ocp voltage range, v ocp . . . . . . . . . . . . ?0.3 v to +6 v fb/cc/olp voltage range, v fb/olp . . . . . . . . . . ?0.3 v to +12 v fm voltage range, v fm . . . . . . . . . . . . . ?0.3 v to +6 v package power dissipation, p d control (v cc i cc(on) ) . . . . . 0.15 w mosfet (v dss i d ) . . . . . . 1.35 w total . . . . . . . . . . . . . . . . . . . . 1.5 w mosfet channel temp., t j . +150c internal frame temp., t f . . . . +125c storage temperature range, t s . . . . . . . . . . . . -40c to +125c * drain switching current is limited by tem- perature (page 2) and safe operating area (page 4). the str-a6251m is a 67 khz pwm topology (with 5% fre- quency jittering for minimum emi) regulator specifically designed to satisfy the requirements for increased integration and reliability in flyback converters. it incorporates a primary control and drive circuit with an avalanche-rated power mosfet. this is a higher-frequency version of the str-a6251. covering the power range from below 21 watts for a 230 vac input, or to 15 watts for a universal (85 to 264 vac) input, this device can be used in a wide range of applications, from dvd players and vcr player/recorders to ac adapters for cellular phones and digital cameras. an auto-burst standby function reduces power consumption at light load, while multiple protections, including the avalanche-energy guaranteed mosfet, provide high reliability of system design. cycle-by-cycle current limiting, undervoltage lockout with hyster- esis, overvoltage protection, and thermal shutdown protect the power supply during the normal overload and fault conditions. overvoltage protection and thermal shutdown are 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. it is provided in an 8-pin mini-dip plastic package with pin 6 removed. features and benefits 67 khz pwm with 5% frequency jittering cost reduction of emi noise filtering rugged 650 v avalanche-rated mosfet simplified surge absorption no v dss derating required low r ds(on) (3.95 maximum) auto-burst mode for stand-by operation or light loads less transformer audible noise built-in leading edge blanking soft start and low start-up current start-up circuit disabled in operation low operating current (4 ma max) automatic burst stand-by (intermittent operation) input power <0.1 w at no load continued always order by complete part number, e.g., str-a6251m .
str-a6251m universal-input/15 w 67 khz 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/constant current multiple protections: pulse-by-pulse overcurrent protection (ocp) overload protection (olp) with auto restart latching overvoltage protection (ovp) undervoltage lockout (uvlo) with hysteresis latching thermal shutdown (tsd) molded small-size 8-pin package for low-height smps this data sheet is based on sanken data sheet sse-23420.
str-a6251m universal-input/13 w 67 khz flyback switching regulator www.allegromicro.com 3 switching regulators electrical characteristics at t a = 25c, v cc = 18 v (unless otherwise specified). pin ratings characteristic no. symbol test conditions min typ max units drain-to-source breakdown volt. 8 - 1 v (br)dss i d = 300 a, 650 - - v v 1 ? v 3 = 0 v (short) drain leakage current 8 i dss v ds = 650 v, - - 300 a v 1 ? v 3 = 0 v (short) on-state resistance 8 - 1 r ds(on) i d = 0.4 a - - 3.95 mosfet switching time 8 - 3 t f - - - 250 ns operation-start voltage 5 - 3 v cc(on) v cc = 0 t 15.7 v 12.9 14.3 15.7 v operation-stop voltage 5 - 3 v cc(off) v cc = 15.7 t 9 v 9.0 10 11 v maximum switching frequency 8 - 3 f osc(max) - 606774khz frequency-jitter deviation 8 - 3 f osc - 4.0 6.7 9.4 khz maximum on duty cycle 8 - 3 d max - 70 76 82 % circuit current in operation 5 i cc(on) - - - 4.0 ma circuit current in non-operation 5 i cc(off) v cc = 12 v - 14 25 a fm voltage 2 - 3 v fmh fosc = f osc(max) 4.0 4.5 5.0 v v fml fosc < f osc(max) 3.2 3.6 4.0 v fm current 2 i fmh -7.7 -11.0 -15.4 a i fml 7.7 11.0 15.4 a ocp threshold voltage 1 - 3 v ocp - 0.67 0.74 0.81 v leading edge blanking time 8 - 3 t bw - 240 350 460 ns burst threshold voltage 4 - 3 v burst - 1.00 1.12 1.24 v olp threshold voltage 4 - 3 v olp - 7.3 8.6 9.9 v current at olp operation 4 i olp - -12 -18 -25 a olp delay time 4 - 3 t olp - 0.84 1.20 1.56 s maximum fb current 4 i fb(max) - 220 310 430 a cc set voltage 4 - 3 v set(cc) - 4.9 5.8 6.7 v cc reset voltage 4 - 3 v res(cc) v cc = 25 v 3.5 3.9 4.3 v start-up current 5 i startup v cc = 13 v 0.84 1.20 1.56 ma ovp operation voltage 5 - 3 v cc(ovp) v cc = 18 t 35.2 v 28.8 32.0 35.2 v ovp/tsd latch sustaining current 5i cc(h) v cc =35.2 t 8.6 v - - 270 a ovp/tsd latch release voltage 5 - 3 v cc v cc =35.2 t 5.9 v 5.9 7.2 8.6 v thermal shutdown - t j - 125 140 - c thermal resistance - r jf - - - 52 c/w typical values are given for circuit design information only. negative current is defined as coming out of (sourcing) the specified terminal.
str-a6251m universal-input/15 w 67 khz flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 4 switching regulators avalanche energy is measured at v dd = 99 v, l = 20 mh, i l = 2.5 a. mosfet typical characteristics recommended operating conditions operating ambient temperature ....... -20c to +100c operating junction temperature ....... -20c to +125c maximum frame temperature ........................ +115c for the availability of parts meeting -40c requirements, contact allegro?s sales representative.
str-a6251m universal-input/13 w 67 khz flyback switching regulator www.allegromicro.com 5 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-a6251m universal-input/15 w 67 khz flyback switching regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 6 switching regulators complete product description and applications information is provided in application note 28103.40, series str- a6200 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. note: the start-up performance of the ic can only be guaranteed for values of c2 greater than 22 f. this value is required to keep the internal supply voltage within regulation during ic initialization.
str-a6251m universal-input/13 w 67 khz flyback switching regulator www.allegromicro.com 7 switching regulators package dimensions dimensions in inches (for reference only) dimensions in millimeters (controlling dimensions) terminal finish: pure sn, 2 nd level interconnect category (e3). product weight: approx. 0.51 g. frame temperature, t f , is measured at the root of pin 3. for more efficient heat radiation, connect a broad pcb pattern at pins 7 and 8. ei 26ei
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