primary side cc/cv regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 1 PT2203_dsb rev en0.1 PT2203 general description the PT2203 is a primary side constant current/current voltage regulator, targeted to applications in less than 5w ac-dc power suppliers. it is designed for the flyback topology, and regulates output current/voltage without the secondary feedback loop. in addition to providing the tight output regulation, the excellent low power control allows the PT2203 to meet all the global energy efficiency and st andby power requirements. the PT2203 provides accurate cv/cc regulation with built in compensation circuitry. integrated line and primary inductance compensation ensures output current free of lin e voltage and primary inductance variations. more over, the integrated output cord resistance compensation fu rther enhances output voltage accuracy. a complete set of integrated protection functions allows the PT2203 to protect against all fault conditions including output short circuit, line under-voltage, and over temperature shut down. the PT2203 is available in a sop-8 package. features z cc and cv control without secondary feed back z eliminates compensation network z built in 650v power mosfet z compensates line voltage variation z compensates inductor variation in cc mode z compensates output cord resistance z vaux over voltage protection z short circuit protection z line under voltage protection z cycle by cycle current limit z over temperature protection applications z led power suppliers z power adapters and battery chargers z standby and auxiliary suppliers ordering information package temperature range ordering part number transport media marking sop-8 -40 to 85 PT2203esoh tape and reel PT2203 xxxxxx note: typical application circuit xxxxxx assembly factory code lot number
primary side cc/cv regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 2 PT2203_dsb rev en0.1 PT2203 pin assignment 1 2 3 8 6 5 sop-8 vaux drain vdd gnd fb drain gnd start 4 7 pin descriptions pin no. pin names description 1 vaux auxiliary winding input, PT2203 is supplied by an auxiliary winding. 2 start start up control pin, connects to the base of the start up transistor 3 vdd dc power supply pin. 4 fb feedback winding voltage sense input 5,6 drain internal mosfet drain output, connect to the transformer primary winding 7,8 gnd ground absolute maximum ratings (note1) sym parameter value unit v vaux vaux dc supply voltage 40 v v start start input voltage -0.3-40 v v dd vdd supply voltage 5 v v fb sense input voltage -0.3-5 v v drain drain output voltage -0.3-650 v topt operating junction temp. range -40 to 150 tstg storage temp. range -55 to 150 hbm esd capability, hbm 3000 v r ja sop-8 100 /w note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. recommended operating range indicates conditions for which the device is functional, but do not guarantee specific performance limits. electrical characteristics state dc and ac electrical specifications und er particular test conditions which guarantee specific performance limits. this assumes that the device is within the operatin g range. specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.
primary side cc/cv regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 3 PT2203_dsb rev en0.1 PT2203 electrical characteristics ( t a =25 , vaux=10v unless specified otherwise ) symbol parameter test condition min typ max unit supply (vaux) v start v aux start-up voltage v aux rising 14 15 16 v v uvlo v aux minimum level v aux falling 6.5 7.5 8.5 v i start v aux start-up current v aux =13.5v measuring current into v aux 3 10 ua i vdd_oper v dd operating current fosc=65khz 1 1.5 ma v auxov v aux over voltage threshold v aux rising 28 30 32 v start and vdd i start start pin current sink ability vstart=5v 10 ma v vdd regulated voltage on vdd 4.5 5 5.5 v i vdd maximum vdd output current vdd=0, measure current flow out from vdd 10 ma feed back voltage sense pin (fb) v ref vs reference voltage v dd =10v 1.975 2.0 2.025 v c fb output cord resistance compensation maximum output power 5 % v smin vs minimum voltage 0.50 v i vs_open vs open loop current -100 ua t smp_dly vs sample delay time 2.25 2.5 2.75 us oscillator (osc) f osc oscillator frequency vs=v ref , i fb ton=2ma*us 60 65 70 khz r atio_cc cc mode frequency ratio fosc at v fb =1.5v /fosc at vcs=1.0v 1.5 r atio_ind inductor correction ratio i fb ton between 1.5ma*us and 2ma*us 1.3 d max maximum duty cycle 60 % t on_min minimum turn on time 1 us drain output i limit current limit di/dt=70ma/us 288 310 332 v bv dss drain breakdown voltage 650 v i dss leakage current v ds =560 10 ua r dson on state resistance 12.5 ? protection t blk current sense leading edge blanking time 200 ns t sd thermal shut down threshold 150
primary side cc/cv regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 4 PT2203_dsb rev en0.1 PT2203 simplified block diagram uvlo drain internal supply pg aux fb driver s&h leb control oscillator inductance correction protection ilimit cv control gnd vdd start pg gnd
primary side cc/cv regulator china resources powtech (shanghai) co. ltd www.crpowtech.com page 5 PT2203_dsb rev en0.1 PT2203 package information sop8 l dimensions in millimeters dimensions in inch symbol min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270(bsc) 0.050(bsc) l 0.400 1.270 0.016 0.050 0 8 0 8
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