ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 1 - description features the ap802 2 combines a dedicated current mode pwm controller with a high voltage power mosfet on the same silicon chip. typical power capability: type sop8 dip8 european (195 - 265 vac) 12 w 20 w us (85 - 265 v ac ) 7 w 12 w the a p 802 2 is available in sop8 and dip8 package. ordering information package type part number sop8 m8 ap 802 2m8u a p802 2m8r ap802 2m8vu ap802 2m8vr dip8 p8 ap802 2p8u ap802 2p8vu note u: tube r: tape & reel v: green package ait provides all pb free produ cts suffix v means green package ? 85v to 265v wide range ac voltage input ? a 700v mosfet on the same silicon chip ? auto start up with high voltage current source ? pwm with current mode control ? 9v to 38v wide range vcc voltage ? fixed 60 kh z switching frequen cy ? automatic skip cycle mode in low load condition. ? over temperature, over current and over voltage protection ? auxiliary under voltage lockout with hysteresis ? available in sop8 and dip8 package application ? power ac/dc adapters for chargers ? dvd/vcd powe r supplies ? electromagnetic oven power supplies ? air conditioner power supplies ? stb power supplies ? ac/dc led driver applications typical application free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 2 - pin description top view top view pin # symb ol function 1,2 gnd sense fet source terminal on primary side and internal control ground. 3 comp feedback input defines the peak drain mosfet current. 4 vcc positive supply voltage input. although connected to an auxiliary transformer winding, current is supplied from sw via an internal switch during startup (see internal block diagram section). it is not until vcc reaches them uvlo upper threshold (14.5v) that the internal start - up switch opens and device power is supplied via the auxiliary transforme r winding. 5,6,7,8 sw the sw pin is designed to connect directly to the primary lead of the transformer and is capable of switching a maximum of 700v. free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 3 - absolute maximum ratings (t a =25c, unless otherwise specified) v sw sw to gnd voltage (t j = 25 - 125c) - 0.3 to 730 v i d continuous vdmos drain current internally limited a vcc supply voltage 0 to 50 v i comp feedback current 3 ma v esdmm electrostatic discharge: machine model ((r=0; c=200pf) 200 v v esdhbm electrostatic discharge: hbm 2000 v t j junction operating temperature internally limited c t c case operating temperature - 40 to 150 c t stg storage temperature - 55 to 150 c stresses above may cause permanent damage to the device. t hese are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the electrical characteristics are not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. e lectrical characteristics power symbol parameter condition min. typ. max. unit bv dss vdmos breakdown voltage i d =1ma; v comp =2v 730 v i dss zero gate voltage drain current v ds =500v; v comp =2v; 100 a r dson static drain - source on resistance v gs =10v i d =0.4a; 15 17 t r rise time i d =0.1a; v in =300v 50 ns t f fall time i d =0.2a; v in =300v 100 c oss vdmos drain capacitance v ds =25v 40 pf free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 4 - control (t a =25c, vcc=18v, unless otherwise specified) symbol parameter condition min. typ. max. unit uvlo section v start vcc start threshold vol tage v comp =0v 13 14.5 16 v v stop vcc stop threshold voltage v comp =0v 7 8 9 v v vcc threshold hysteresis hys 5.8 6.5 7.2 v oscillator section f osc initial accuracy v stop vcc35v; 0t j 100c 54 60 66 khz f/t frequency change with temperature - 25c t j +85c 5 10 % feedback section i comp feedback shutdown current tj=25c, v comp = 0v 0.9 ma r comp comp pin input impedance id=0ma 1.2 k current limit( self - protection)section g id i comp to i d current gain 560 i lim peak current limit t j = 25c 0.56 0.70 0.84 a t d current sense delay to turn - off i d =0.2a 200 ns t b blanking time 500 ns t onmin minimum turn on time 700 ns protection section t sd thermal shutdown temperature 140 170 - c t hyst thermal shutdown hysteresis 40 c v ovp over voltage protection 38 42 46 v supply current section i ch startup charging current 1 ma i start up charging current in thermal shutdown choff vcc=5v; v ds =100v t j > t sd 0.2 ma i op0 operating supply current (control part only) switching v comp = 0v 4.5 ma i operating supply current (control part only) not switching op1 v comp = 2v 3 5 ma free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 5 - block diagram free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 6 - detai led information startup this device includes a high voltage start up current source connected on the sw of the device. as soon as a voltage is applied on the input of the converter, this start up current source is activated and to charge the vcc capacito r as long as vc c is lower than vstart. when reaching vstart, the start up current source is cut off by uvlo&tsd and the device begins to operate by turning on and off its main power mosfet. as the comp pin does not receive any current from the opto - coupler , the device operates at full current capacity and the output voltage rises until reaching the regulation point where the secondary loop begins to send a current in the opto - coupler. at this point, the converter enters a regulated operation where the comp pin receives the amount of current needed to deliver the right power on secondary side. fi g 1. startup circuit feedback a feedback pin controls the operation of the device. unlike conventional pwm control circuits which use a voltage input, the comp pin is sensitive to curre nt. the fig 2. presents the internal current mode structure. fig 2. feedback circuit free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 7 - the power mosfet delivers a sense current which is proportional to the main current. r2 receives this current and the current coming from the comp pin. the voltage across r2 vr2 is then compared to a fixed reference voltage. the mosfet is switched off when vr2 equals the reference voltage. leading edge blanking (leb) at the instant the internal sense fet is turned on, there usually exists a hi gh current spike through the sense fet, caused by the primary side capacitance and secondary side rectifier diode reverse recovery. excessive voltage across the sense resistor would lead to false feedback operation in the current mode pwm control. to coun ter this effect, the device employs a leading edge blanking (leb) circuit. this circuit inhibits the pwm comparator for a short time (typically 500ns) after the sense fet is turned on. under voltage lock out once fault condition occurs, switching is termi nated and the sense fet remains off. this causes vcc to fall. when vcc reaches the uvlo stop voltage, 8v, the protection is reset and the internal high voltage current source charges the vcc capacitor. when vcc reaches the uvlo start voltage, 14.5v, the de vice resumes its normal operation. in this manner, the auto - restart can alternately enable and disable the switching of the power sense fet until the fault condition is eliminated. thermal shutdown (tsd) t he sense fet and the control ic are integrated in the same chip, making it easier for the control ic to detect the temperature of the sense fet. when the temperature exceeds approximately 170c, thermal shutdown is activated, the device turn off the sense fet and the high voltage current source to charge vcc. the device will go back to work when the lower threshold temperature about 140c is reached. over voltage protection (ovp) in case of malfunction in the secondary side feedback circuit, or feedback loop open caused by a defect of solder, the current through the opto - coupler transistor becomes almost zero. because excess energy is provided to the output, the output voltage may exceed the rated voltage, resulting in the breakdown of the devices in the secondary side. in order to prevent this situation, an over voltage protection (ovp) circuit is employed. if vcc exceeds 42v, ovp circuit is activated resulting in termination of the switching operation. in order to avoid undesired activation of ovp during normal operation, vcc should be properly designed to be below 42v. free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 8 - package information dimension in sop8 package (unit: mm) top view end view symbol min nom max a - - 1.77 a1 0.08 0.18 0.28 b 0.44 - 0.53 c 0.21 - 0.26 d 4.70 4.90 5.10 e 5.80 6.00 6.20 e1 3.70 3.90 4.10 e 1.27bsc 0 - 8 o side view free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 9 - dimension in dip8 package (unit: mm) top view end view symbol min nom max a 3.60 3.80 4.00 a2 3.10 3.30 3.50 b 0.44 - 0.53 b1 1.52bsc c 0.2 5 - 0.31 c 1 0.24 0.25 0.26 d 9.05 9.25 9.45 e1 6.15 6.35 6.55 e 2.54bsc ea 7.62bsc l 3.00 - - side view free datasheet http://www.datasheet-pdf.com/
ait s emiconductor inc. www.ait - ic.com a p802 2 off line smps primary switch er green power rev1.0 - nov2008 released - - 10 - important notice ait semiconductor inc. (ait) reserves the right to make changes to any its pr oduct, specifications, to dis co ntinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. ait semiconductor inc. 's integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or systems or other critical applications. use of ait products in such applications is understood to be fully at the risk of the customer. as used herein may involve potential risks of death, personal injury, or servere property, or environmental damage. in order to minimize risks associated with the customer's applications, the customer should provide adequat e design and operating safeguards. ait semiconductor inc . assumes to no liability to customer product design or application support. ait warrants the performance of its products of the specifications applicable at the time of sale. free datasheet http://www.datasheet-pdf.com/
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