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1 revision 1.2 , 2015 - 05 - 12 about this document scope and purpose this document is a 12w 5.0v , universal input off - line flyback converter evaluation board using infineon coolset? f3r80 family, ice3ar4780vjz . intended audience this document is intended for users of the ice3ar4780vjz who wish to design low cost and high reliable system of off - line smps for enclosed adapter or open frame auxiliary po w er supply of white goods, pc, server, dvd, tv, set - top box, etc. table of contents about this document ................................ ................................ ................................ ................... 1 table of contents ................................ ................................ ................................ ........................ 1 1 abstract ................................ ................................ ................................ ..................... 3 2 evaluation board ................................ ................................ ................................ ........ 3 3 evaluation board specifications ................................ ................................ .................... 4 4 list of features (ice3ar4780vjz) ................................ ................................ .................. 4 5 circuit description ................................ ................................ ................................ ....... 5 5.1 introduction ................................ ................................ ................................ ................................ ............... 5 5.2 line input ................................ ................................ ................................ ................................ ................... 5 5.3 line input over voltage protection ................................ ................................ ................................ .......... 5 5.4 start up ................................ ................................ ................................ ................................ ....................... 5 5.5 operation mode ................................ ................................ ................................ ................................ ........ 5 5.6 soft start ................................ ................................ ................................ ................................ ..................... 5 5.7 r cd clamper circuit ................................ ................................ ................................ ................................ ... 5 5.8 peak current control of primary current ................................ ................................ ................................ . 6 5.9 output stage ................................ ................................ ................................ ................................ .............. 6 an - eval - 3 ar4 7 80 vjz 1 2 w 5 v smps e va luati on board wi th ic e3 ar4 7 8 0 vjz application note
12w 5v smps evaluation board with ice3ar4780vjz abstract application note 2 revision 1.2 , 2015 - 05 - 12 6 circuit diagram ................................ ................................ ................................ ........... 7 7 pcb layout ................................ ................................ ................................ ................. 8 7.1 top side ................................ ................................ ................................ ................................ ...................... 8 7.2 bottom side ................................ ................................ ................................ ................................ ................ 8 8 component list ................................ ................................ ................................ ........... 9 9 transformer construction ................................ ................................ .......................... 10 10 test results ................................ ................................ ................................ .............. 11 10.1 efficiency ................................ ................................ ................................ ................................ .................. 11 10.2 standby power ................................ ................................ ................................ ................................ ........ 12 10.3 line regulation ................................ ................................ ................................ ................................ ......... 13 10.4 load regulation ................................ ................................ ................................ ................................ ....... 13 10.5 maximum power ................................ ................................ ................................ ................................ ...... 14 10.6 esd immunity (en61000 - 4 - 2) ................................ ................................ ................................ ................. 1 4 10.7 surge immunity (en61000 - 4 - 5) ................................ ................................ ................................ .............. 14 10.8 conducted emissions ( en55022 class b) ................................ ................................ .............................. 15 10.9 thermal measurement ................................ ................................ ................................ ........................... 17 11 waveforms and scope plots ................................ ................................ ........................ 18 11.1 start up at low/high ac line input voltage with maximum load ................................ ........................ 18 11.2 soft start ................................ ................................ ................................ ................................ ................... 18 11.3 freq uency jittering ................................ ................................ ................................ ................................ .. 19 11.4 drain voltage and current at maximum load ................................ ................................ ....................... 19 11.5 load transient response (dynamic load from 10% to 100%) ................................ ............................. 20 11.6 output ripple voltage at maximum load ................................ ................................ .............................. 20 11.7 output ripple voltage during burst mode at 1 w load ................................ ................................ ........ 21 11.8 active burst mode operation ................................ ................................ ................................ ................. 21 11.9 vcc over voltage protection (odd skip auto restart mode) ................................ ................................ 22 11.10 over load protection (auto restart mode) ................................ ................................ ............................ 22 11.11 v cc under voltage/short optocoupler protection (normal auto restart mode) ................................ 23 11.12 ac line input ovp mode ................................ ................................ ................................ ......................... 23 12 references ................................ ................................ ................................ ............... 24 revision history ................................ ................................ ................................ ........................ 24
12w 5v smps evaluation board with ice3ar4780vjz abstract application note 3 revision 1.2 , 2015 - 05 - 12 1 abstract this document is an engineering r eport of a universal input 12w 5v off - line flyback conv erter power supply utilizing f3r 80 coolset? ice3ar4780vjz . the application evaluation board is operate d in discontinuous conduction mode (dcm) and is running at 100 khz switching frequency. it has a single output voltage with secondary side control regulation. it is especially suitable for small power supply such as dvd player , set - top box, game console, charger and auxiliary power of white goods, server, pc and high power system, etc . the ice3ar4780v jz is the latest version of the coolset?. besides having the basic features of the f3 r coolset? such as active burst mode, propagation delay compensation, soft gate drive, auto restart protection for major fault (vcc over voltage, vcc under voltage, a djust able input ovp, over temperature, over - load, open loop and short opto - coupler), it also has the bicmos technology design, selectable entry and exit burst mode level, adjustable ac line input over voltage protection feature, built - in soft start time, built - in and extendable blanking time and frequency jitter feature, etc. the particular features are the best - in - class low standby power and the good emi performance. 2 evaluation board this document contains the list of features, the power supply specification, schematic, bill of material and the transformer construction documentation. typical operating characteristics such as performance curve and scope waveforms are showed at the rear of the report . figure 1 eval - 3ar4780vjz [dimensions l x w x h: 95mm x 41mm x 24mm (3.74" x 1.61" x 0.94")]
12w 5v smps evaluation board with ice3ar4780vjz evaluation board specifications application note 4 revision 1.2 , 2015 - 05 - 12 3 evaluation board s pecifications input voltage 85 vac~265vac input frequency 50~60hz output voltage 5v output current 2. 4 a output power 12 w steady state output ripple voltage (1% of norminal output voltage) v ripple_p_p < 5 0 mv dynamic load response undershoot & overshoot (3% of norminal output voltage) v ripple_p_p < 2 5 0 mv active mode four point average efficiency (25%,50%,75% & 100%load) ( eu coc version 5, tier 1) active mode at 10 % load efficiency ( eu coc version 5, tier 1) > 8 0 % at 115vac and > 79 % at 230vac > 7 3 % no - load power consumption (eu coc version 5, tier 2 ) < 75 mw maximum input power(peak power) for universal input range ( < 5 % of average maximum input power ) < 3 % of average maximum input power form factor case size (l x w x h) 95mm x 41mm x 24mm (3.74" x 1.61" x 0.94") 4 list of feature s ( ice3ar4780vjz ) 800v avalanche rugged coolset? with startup cell active burst mode for lowest standby power selectable entry and exit burst mode level 100khz internally fixed switching frequency with jittering feature auto restart protection for over load, open loop, vcc under voltage & over voltage and over temperature over temperature protection with 50c hysteresis built - in 10ms soft start built - in 20ms and extendable blanking time for short duration peak power propagation delay compensation for both maximum load and burst mode adjustable input ovp overall tolerance of current limiting < 5% bicmos technology for low power consumption and wide vcc voltage range soft gate drive with 50
12w 5v smps evaluation board with ice3ar4780vjz circ uit description application note 5 revision 1.2 , 2015 - 05 - 12 5 circuit description 5.1 introduction the eval - 3ar4780vjz evaluation board is a low cost off - line flyback switch mode power supply (smps) using the ice3ar4780vjz integrated power ic from the coolset? - f3r80 family. the circuit shown in figure 3, details a 5v, 12w power supply that operates from an ac line input voltage range of 85vac to 265vac and line input o vp detect/reset voltage is 300/282vac, suitable for applications in enclosed adapter or open frame auxiliary power supply for different system such as white goods, pc, server, dvd, led tv, set - top box, etc. 5.2 line i nput the ac line input side comprises the i nput fuse f1 as over - current protection. the c hoke l11, x - capacitors c11, c14 and y - capacitor c12 act as emi suppressors. optional spark gap device sg1, sg 2 and varistor var can absorb high voltage stress during lightning surge test. after the bridge recti fier br1 and the input bulk c apacitor c13 , a voltage of 90 to 424 v dc is present which depend s on input line voltage. 5.3 line input over v oltage p rotection the ac line i nput ovp mode is detected by sensing the voltage level at bv pin through the resistors divider from the bulk capacitor . once the voltage level at bv pin hits above 1.98v, the controller stops switching and enters into inpu t ovp mode. when the bv voltage dr ops to 1.91v and the vcc hits 17v, the input ovp mode is released. 5.4 start up since there is a built - in startup cell in the ice3ar4780vjz, no external start up resistor is required. the startup cell is connecting the drain pin of the ic. once the voltage is built up at the drain pin of the ice3ar4780vjz, the startup cell will charge up the vcc capacitor c16 and c17. when the vcc voltage exceeds the uvlo at 17v, the ic starts up. then the vcc voltage is bootstrapped by the auxiliary winding to sustain the operation. 5.5 operation mode during operation, the v cc pin is supplied via a separ ate transformer winding with associated rectification d 1 2 and buffering c 16 , c 17 . in order not to exceed the maximum voltage at v cc pin due to poor coupling of transformer winding, an external zener diode z d 11 and resistor r13 can be added . 5.6 soft start the soft - start is a built - in function and is set at 10ms. 5.7 rcd clamper circuit while turns off the coolmos? , t he clamper circuit r1 1 , c 15 and d 11 absorbs the current caused by transformer leakage inductance once the voltage exceeds clamp capacitor voltage. fin ally drain to source voltage of coolmos? is lower than maximum break down voltage (v (b r )dss = 80 0v ) of coolmos?.
12w 5v smps evaluation board with ice3ar4780vjz circuit description application note 6 revision 1.2 , 2015 - 05 - 12 5.8 peak current control of primary c urrent the coolmos? drain source current is sensed via external shunt resistors r14 and r14a which determine the tolerance of the current limit control. since ice3ar4780vjz is a current mode controller, it would have a cycle - by - cycle primary current and feedback voltage control which can make sure the max imum power of the converter is controlled in every switching cycle. besides, the patented propagation delay compensation is implemented to ensure the maximum input power can be controlled in an even tighter manner. the evaluation board shows approximately 2.2 % of average maximum input power (refer to figure 11) . 5.9 output s tage on the secondary side the power is coupled out by a schottky diode d21. the capacitor c22 & c23 provide s energy bufferi ng following with the lc filter l21 and c24 to reduce the output voltage ripple co nsiderably. storage capacitors c22 & c23 are selected to have a very small internal resista nce (esr) to minimize the output voltage ripple .
12w 5v smps evaluation board with ice3ar4780vjz circuit diagram application note 7 revision 1.2 , 2015 - 05 - 12 6 circuit diagram figure 2 schematic of eval - 3ar4780vjz
12w 5v smps evaluation board with ice3ar4780vjz pcb layout application note 8 revision 1.2 , 2015 - 05 - 12 n.b. : in order to get the optimized performance of the coolset?, the grounding of the pcb layout must be connected very carefully. from the circuit diagram above, it indicates that the grounding for the coolset? can be split into several groups; signal ground, vcc ground, current sense resistor ground and emi return ground. all the split grounds should be connected to the bulk capacitor ground separately. signal ground includes all small signal grounds connecting to the coolset? gnd pin such as filter capacitor ground, c17, c18, c19 and opto - coupler ground. vcc ground includes the vcc capacitor ground, c16 and the auxiliary winding ground, pin 2 of the power transformer. current sense resistor ground includes current sense resistor r14 and r14a. emi return ground includes y capacitor, c12. 7 pcb layout 7.1 top side figure 3 top side component legend 7.2 bottom side figure 4 bottom side copper and component legend
12w 5v smps evaluation board with ice3ar4780vjz component list application note 9 revision 1.2 , 2015 - 05 - 12 8 c omponent l ist no. designator component description footprint part number manufacturer quantity 1 +5v com, l n 12v test point connector 691102710002 wurth electronics 2 2 br1 600v/1a 1v s1vba60 shindengen 1 3 c11 100nf/305v mkt5/18/15 b329221c3104k epcos 1 4 c12 2.2nf/250v mkt2/13/10 DE1E3KX222MA4BN01F murata 1 5 c13 33uf/450v rb16x25 450bxc33mefc16x25 rubycon 1 6 c15 1nf/630v 1206 grm31a7u2j102jw31d murata 1 7 c16 22uf/50v rb5.5 50px22mefc5x11 rubycon 1 8 c17,c19 100nf/50v 0603 grm188r71h104ka93d murata 2 9 c18 330pf/50v 0603 grm1885c1h331ga01d murata 1 10 c22 1000uf/10v rb10 10zlh1000mefc10x12.5 rubycon 1 11 c24 680uf/10v rb8 10zlh680mefc8x11.5 rubycon 1 12 c25 220nf/50v 0603 grm188r71h224kac4d murata 1 13 c26 2.7nf/50v 0603 grm188r71h272ka01d murata 1 14 d11 600v/0.8a diode0.4 d1nk60 shindengen 1 15 d12 200v/0.5a 1206d gl34d 1 16 d21 45v/30a to-220fpab stps30l45cfp 1 17 f1 300v/1.6a mkt4.3/8.4/5 36911600000 1 18 hs1 to220 heat sink hs to220 577202b00000g 1 19 ic11 ice3ar4780vjz dip7 ice3ar4780vjz infineon 1 20 ic12 sfh617 a3 dip4 1 21 ic21 tl431 to92-tl431- 1 22 j1,j2,j3,j4,r15c jumper axial 0.4 5 23 l11 39mh/0.6a emi_c_u21 b82731m2601a030 epcos 1 24 l21 2.2 h/4.3a ch6 2.5 7447462022 wurth electronics 1 25 r11 150k/2w axial0.4_v 4mm 1 26 r12 18r 0603 1 27 r14,r14a 2r7/0.33w/1% 1206 erj8bqf2r7v 2 28 r15 3m/1% axial0.4_15 1 29 r15a,r15b 3m/1% 1206 2 30 r16 43.2k/1% 0603 1 31 r22 130r 0603 1 32 r23 1.2k 0603 1 33 r24 150k 0603 1 34 r25 20k axial0.3 1 35 r26 20k 0603 1 36 tr1 571h(54:4:13) tr_ef20_h 750342411 wurth electronics midcom 1 37 var 275v/0.25w mkt3.5/7.5/5 b72207s2271k101 epcos 1
12w 5v smps evaluation board with ice3ar4780vjz tr ansformer construction application note 10 revision 1.2 , 2015 - 05 - 12 9 transformer construction core and material: ee20/10/6(ef20), tp4a (tdg) bobbin: 070 - 4989(10 - pins, th - h, horizontal version) primary inductance, lp=571 h (10%), measured between pin 4 and pin 5 manufacturer and part number: wurth electronics midcom ( 750342411 ) figure 5 transformer structure
12w 5v smps evaluation board with ice3ar4780vjz test results application note 11 revision 1.2 , 2015 - 05 - 12 10 test results 10.1 efficiency figure 6 efficiency vs ac line i nput voltage vin(vac) pin(w) vo(vdc) io(a) v out_ripple_pk_pk (mv) po(w) (%) average (%) olp p in (w) olp i out (a) 0.0288 5.23 0.00 14.10 1.6200 5.21 0.24 25.70 1.25 77.19 3.8500 5.19 0.600 10.70 3.11 80.88 7.6200 5.15 1.200 13.80 6.18 81.10 11.5600 5.11 1.800 15.50 9.20 79.57 15.6200 5.06 2.400 18.40 12.14 77.75 0.0306 5.23 0.00 14.40 1.6300 5.21 0.24 26.50 1.25 76.71 3.8300 5.19 0.600 10.70 3.11 81.31 7.5700 5.15 1.200 13.40 6.18 81.64 11.3700 5.11 1.800 15.60 9.20 80.90 15.2500 5.06 2.400 17.10 12.14 79.63 0.0425 5.23 0.00 15.40 1.6800 5.21 0.24 24.40 1.25 74.43 4.0000 5.19 0.600 10.60 3.11 77.85 7.6800 5.15 1.200 13.70 6.18 80.47 11.3700 5.11 1.800 16.10 9.20 80.90 15.0700 5.06 2.400 17.20 12.14 80.58 0.0494 5.23 0.00 15.10 1.7100 5.21 0.24 24.90 1.25 73.12 4.1000 5.19 0.600 10.00 3.11 75.95 7.7500 5.15 1.200 13.20 6.18 79.74 11.4300 5.11 1.800 16.00 9.20 80.47 15.1000 5.06 2.400 17.30 12.14 80.42 230 17.92 2.85 85 17.85 2.72 79.82 115 17.54 2.75 79.95 80.87 79.15 265 18.33 2.89
12w 5v smps evaluation board with ice3ar4780vjz test results application note 12 revision 1.2 , 2015 - 05 - 12 figure 7 efficiency vs output power @ 115vac and 230v line 10.2 s tandby power figure 8 standby power @ no load vs ac line input voltage (measured by yokogawa wt210 power meter - integ ration mode)
12w 5v smps evaluation board with ice3ar4780vjz test results application note 13 revision 1.2 , 2015 - 05 - 12 10.3 line regulation figure 9 line r egulation vo @ full load vs ac l ine input voltage 10.4 load regulation figure 10 load regulation vo vs output power
12w 5v smps evaluation board with ice3ar4780vjz test results application note 14 revision 1.2 , 2015 - 05 - 12 10.5 maximum power figure 11 maximum input power (before over - load protection) vs ac line input voltage 10.6 esd immunity (en61000 - 4 - 2) pass [ special level (18 kv) for contact discharge ] . 10.7 surge immunity (en61000 - 4 - 5) pass [ installation class 3 , 2 kv (line to earth) and 1kv (line to line ) ].
12w 5v smps evaluation board with ice3ar4780vjz test results application note 15 revision 1.2 , 2015 - 05 - 12 10.8 conducted emissions ( en55022 class b) the conducted emi was measured by schaffner (smr25503) and followed the test standard of en55022 (cispr 22) class b. the evaluation board was set up at maximum load ( 12w ) with input voltage of 115vac and 230vac. figure 12 conducted emissions (line) at 115vac and maximum load figure 13 conducted emissions ( neutral) at 115vac and maximum load
12w 5v smps evaluation board with ice3ar4780vjz test results application note 16 revision 1.2 , 2015 - 05 - 12 figure 14 conducted emissions (line) at 230vac and maximum load figure 15 conducted emissions (neutral) at 230vac and maximum load pass conducted emi en55022 (cispr 22) class b with > 7 db margin for qp.
12w 5v smps evaluation board with ice3ar4780vjz test results application note 17 revision 1.2 , 2015 - 05 - 12 10.9 thermal measurement the thermal test of open frame evaluation board was done using an infrared thermography camera (tvs - 500ex) at ambient temperature 25?c. the measurements were taken after tw o hours running at full load ( 12w ). no. major component 85vac ( c ) 115vac ( c ) 230vac ( c ) 265vac ( c ) 1 ic11 (ice3ar4780vjz ) 57.5 50.7 49.9 50.7 2 br1 46.9 40.2 33.6 33.1 3 l11 44.0 39.1 32.3 31.6 4 tr1 51.5 51.4 53.3 53.9 5 d21 54.2 54 54.5 54.9 85vac, 12w load, 25 ? c ambient 115vac, 12w load, 25 ? c ambient 230vac, 12w load, 25 ? c ambient 265vac, 12w load, 25 ? c ambient figure 16 infrared thermal image of eval - ice3ar4780vjz
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 18 revision 1.2 , 2015 - 05 - 12 11 waveforms and scope plots all waveforms and scope plots were recorded with a lecroy 6050 oscilloscope 11.1 start up at low/high ac line input voltage with maximum load channel 1; c1 : drain voltage (v drain ) channel 2; c2 : supply v oltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) channel 1; c1 : drain voltage (v drain ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) startup time = 377ms startup time = 377ms figure 17 startup @ 85vac & max. load figure 18 startup @ 265vac & max. load 11.2 soft start channel 1; c1 : current s ense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) soft star time = 9.8ms figure 19 soft s tart @ 85vac & max. load 377ms entry/exit burst selection entry/exit burst selection 377ms 9.8ms
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 19 revision 1.2 , 2015 - 05 - 12 11.3 frequency jittering channel 2; c2 : drain voltage ( v d rain ) channel f2 : frequency track of c2 frequency jittering from 92 khz ~ 100 khz, jitter period is set at 4ms internally figure 20 frequency jittering@ 85 vac and max. load 11.4 drain voltage and current at maximum load channel 1; c1 : drain voltage (v drain ) channel 2; c2 : current sense voltage (v cs ) channel 1; c1 : drain voltage (v drain ) channel 2; c2 : current sense voltage (v cs ) v drain_peak = 284v v drain_peak = 573v figure 21 operation @ 85vac and max. load figure 22 operation @ 265vac and max. load
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 20 revision 1.2 , 2015 - 05 - 12 11.5 load transient response (dynamic load from 10% to 100%) channel 1; c1 : output ripple voltage (vo) channel 2; c2 : output current (io) channel 1; c1 : output ripple voltage (vo) channel 2; c2 : output current (io) v ripple_pk_pk = 220 mv (load change from10% to 100%,100hz,0.4a/ s slew rate) probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrolytic), 20mhz filter v ripple_pk_pk =220 mv (load change from10% to 100%,100hz,0.4a/ s slew rate) probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrolytic), 20mhz filter figure 23 C load transient response @ 85vac figure 24 load transient response @ 265vac 11.6 output ripple voltage at maximum load channel 1; c1 : output ripple voltage (vo) channel 2; c2 : output current (io) channel 1; c1 : output ripple voltage (vo) channel 2; c2 : output current (io) v ripple_pk_pk =16mv probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrol ytic), 20mhz filter v ripple_pk_pk = 16mv probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrolytic), 20mhz filter figure 25 ac output ripple @ 85vac and max. load figure 26 ac outpu t ripple @ 265vac and max. load
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 21 revision 1.2 , 2015 - 05 - 12 11.7 output ripple voltage during burst mode at 1 w load channel 1; c1 : output r ipple v oltage (vo) channel 2; c2 : output current (io) channel 1; c1 : output r ipple v oltage (vo) channel 2; c2 : output current (io) v ripple_pk_pk =25mv probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrolytic), 20mhz filter v ripple_pk_pk = 18 mv probe terminal end with decoupling capacitor of 0.1 f(ceramic) & 1 f(electrolytic), 20mhz filter figure 27 ac output ripple @ 85vac and 1w loa d figure 28 ac output ripple @ 265vac and 1w load 11.8 active burst mode operation channel 1; c1 : current s ense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) channel 1; c1 : current s ense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) condition: v f b <1.27v & last for 20 ms (load change form full load to 0.5w load) condition: v f b >4.5v (load change form 0.5w load to full load) figure 29 entering active burst mode @ 85vac figure 30 leaving active burst mode @ 85vac
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 22 revision 1.2 , 2015 - 05 - 12 11.9 vcc over voltage protection (odd skip auto restart mode) channel 1; c1 : current sense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) condition: v cc >20.5 & last for 150s v cc >20.5 & v fb >4.5v & during soft start & last for 30s (j4 disconnected during system operating at no loa d) figure 31 vcc overvoltage protection @ 85 vac 11.10 over load protection (auto restart mode) channel 1; c1 : current sense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) condition: v fb >4.5v & last for 20ms & v bv >4.5v & last for 30s ( output load change from 2.4 to 3a) figure 32 over load protection with built - in+extended blanking time @ 85 vac v cc ovp2 v cc ovp1 b uilt - in 20ms blanking extended blanking
12w 5v smps evaluation board with ice3ar4780vjz waveforms and scope plots application note 23 revision 1.2 , 2015 - 05 - 12 11.11 v cc under voltage/short optocoupler protection (normal auto restart mode) channel 1; c1 : current sense voltage (v cs ) channel 2; c2 : supply voltage (v cc ) channel 3; c3 : feedback voltage (v fbb ) channel 4; c4 : bv voltage (v bv ) condition: v cc <10.5v (short the transistor of optocoupler during system operating @ full load and release) figure 33 v cc under voltage/short optocoupler protection @ 85 vac 11.12 ac line input ovp mode channel 1; c1 : bulk voltage(v bulk ) channel 2; c2 : supply v oltage (v cc ) channel 3; c3 : current s ense voltage (v cs ) channel 4; c4 : bv voltage (v bv ) channel 1; c1 : bulk voltage(v bulk ) channel 2; c2 : supply v oltage (v cc ) channel 3; c3 : current s ense voltage (v cs ) channel 4; c4 : bv voltage (v bv ) condition: v bv >1.98v & last for 400s (ovp detect) v bv <1.91v & last for 5s (ovp reset) (graduall y increase ac line voltage until ovp detect and decrease ac line until ovp reset) condition: v bv >1.98v & last for 400s (ovp detect) v bv <1.91v & last for 5s (ovp reset) (gradually increase ac line voltage until ovp detect and decrease ac line until ovp reset) figure 34 input ovp mode at max. load condition figure 35 input ovp mode at no load condition enter autorestart exit autorestart 421 vdc (298vac) enter input ovp 403 vdc (285vac) exit input ovp 421 vdc (298vac) enter input ovp 401 vdc (283vac) exit input ovp
12w 5v smps evaluation board with ice3ar4780vjz references application note 24 revision 1.2 , 2015 - 05 - 12 12 references [1] infineon technologi es, datasheet coolset? - f3 r80 ice3ar4780vjz off - line smps current mode controller with integrated 800v coolmos?and startup cell( input ovp & frequency jitter) in dip - 7 [2] infineon technologi es, an - ps0044 - coolset f3r80 dip - 7 browno ut/ input ovp & frequency jitter versi on design guide - v1.5 revision history major changes since the last revision page or reference description of change 5 add section 5.3 under circuit description
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