? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 1 ?\? ? description features the AP8012 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) 8w 13w us (85-265 vac) 5 w 8w the AP8012 is available in sop8 and dip8 package. ordering information package type part number sop8 m8 a p8012m8u a p8012m8r a p8012m8vu a p8012m8vr dip8 p8 a p8012p8u a p8012p8vu note r: tape & reel v: green package a it provides all pb free products suffix v means green package z 85v to 265v wide range ac voltage input z a 700v mosfet on the same silicon chip z auto start up with high voltage current source z pwm with current mode control z 9v to 38v wide range vcc voltage z fixed 60khz switching frequency z automatic skip cycle mode in low load condition. z over temperature, over current and over voltage protection z auxiliary under v oltage lockout with hysteresis z available in sop8 and dip8 package application z power ac/dc adapters for chargers z dvd/vcd power supplies z electromagnetic oven power supplies z air conditioner power supplies z stb power supplies z ac/dc led driver applications typical application http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 2 ?\? ? pin description top view top view pin # symbol function 1,2 gnd sense fet source termin al on primary side and internal control ground. 3 comp feedback input defines the peak drain mosfet current. 4 vcc positive supply voltage inpu t. although connected to an auxilia ry transformer winding, current is supplied from sw via an internal switch dur ing startup (see internal block diagram section). it is not until vcc reaches th em uvlo upper threshold (14.5v) that the inter nal start-up switch opens and d evice power is supplied via the auxilia ry transformer winding. 5,6,7,8 sw the sw pin is designed to connec t directly to the primary lead of the transformer and is capable of switching a maximum of 700v. http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 3 ?\? ? absolute maximum ratings (t a =25c, unless other wise 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. these are stress ratings only and func tional operation of the device at these or any other conditions bey ond those indicated in the ele ctrical characteristics are not i mplied. exposure to absolute m aximum rating conditions for extended peri ods may affect device reliab ility. electrical 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; 27 30 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 http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher 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 voltage v comp =0v 13 14.5 16 v v stop vcc stop threshold voltage v comp =0v 7 8 9 v v hys vcc threshold hysteresis 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 320 i lim peak current limit t j = 25c 0.32 0.40 0.48 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 choff start up charging current in thermal shutdown 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 op1 operating supply current (control part only) not switching v comp = 2v 3 5 ma http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 5 ?\? ? block diagram http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 6 ?\? ? detailed information startup this device includes a high vo ltage start up current source con nected 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 capacitor as long as vc c is lower than vstart. when re aching vstart, the start up curre nt 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, th e device operates at full current capacity and the output voltage rises until r eaching the regulation point wh ere the secondary loop begins to send a current in the opto-coupler. at this point, the converter enters a regu lated operation where the comp pin receives the amount of current needed to deliv er the right power on secondar y side. fig 1. startup circuit feedback a feedback pin controls the operat ion of the device. unlike con ventional pwm control circuits which use a voltage input, the comp pin is sensitive to current. the fig 2. presents the internal c urrent mode structure. fig 2. feedback circuit http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher 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 fr om the comp pin. the voltage a cross r2 vr2 is then compared to a fixed reference voltage. the mosfet is switched off when vr2 equals t he reference voltage. leading edge blanking (leb) at the instant the internal sense fet is turned on, there usual ly exists a high 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 counter this effect, the device employs a leading e dge blanking (leb) circuit. this circuit inhibits the pwm comparator for a short ti me (typically 500ns) after the sense fet is turned on. under voltage lock out once fault condition occurs, switching is terminated and the se nse fet remains off. this causes vcc to fall. when vcc reaches the uvlo stop voltage, 8v, the protection is r eset and the internal high voltage current source charges the vcc capacito r. when vcc reaches the uvlo sta rt voltage, 14.5v, the device resumes its normal operation. in this m anner, the auto-restart can alte rnately enable and disabl e the switching of the power sense fet until the fault condition is eliminated. thermal shutdown (tsd) the sense fet and the control ic are integrated in the same chi p, 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 vo ltage current source to charge vcc. the device will go back to work when the lowe r 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 v oltage may exceed the rated voltage, resulting in the breakdown of the devices in the secondary side. in order to prevent this situati on, an over voltage protection (ovp) circuit is employed. if vcc exceeds 42v, ovp circuit is activated resultin g in termination of the switching operation. in order to avoid undesired activation of ovp during normal operat ion, vcc should be properly designed to be below 42v. http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher 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 http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher 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 0.25 - 0.31 c1 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 http://www..net/ datasheet pdf - http://www..net/
? ? ? ait ? semiconductor ? inc. ? www.ait \ ic.com ? AP8012 off ? line ? smps ? primary ? switcher green ? power ? ? rev1.0 ?????\ nov2008 ? released ?\????? ????\? 10 ?\? ? important notice ait semiconductor inc. (ait) reserves the right to make changes to any its product, specifications, to discontinue any integrated circu it product or service without n otice, and advises its customers to obtain the latest version of relevant information to verify, before placin g orders, that the information being relied on is current. ait semiconductor inc.'s integrat ed circuit products are not de signed, intended, authorized, or warranted to be suitable for use in life support applications, devices or sy stems 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 p roperty, or environmental damage. in order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. ait semiconductor inc. assumes to no liability to customer prod uct design or application support. ait warrants the performance of its products of the specifications applicable at the time of sale. http://www..net/ datasheet pdf - http://www..net/
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