unisonic technologies co., ltd ucs1603s preliminary linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2016 unisonic technologies co., ltd qw-r103-116.a high performance current mode power switch ? description the utc ucs1603s is an integrated pwm controller and power mosfet specifically designed for switching operation with minimal external components. the utc ucs1603s is designed to provide several special enhancements to satisfy the needs, for example, power-saving mode for low standby power, frequency hopping , constant output power limiting , slope compensation ,over current protection (ocp), over voltag e protection (ovp), over load protection (olp), under voltage lock out (uvlo), over temperature protection (otp), etc. ic will be shutdown or can auto-restart in situations. ? feature dip-8 * internal power mosfet (600v) * programming gate driver capability * frequency hopping for improved emi performance. * lower than 30mw standby power design * linearly decreasing frequency to 20~35khz during light load * internal soft start * internal slope compensation * constant power limiting for universal ac input range * gate output maximum voltage clamp(16v) * over temperature protection * over load protection * over voltage protection * leading edge blanking * cycle-by-cycle current limiting * under voltage lock out ? ordering information ordering number lead free halogen free package packing UCS1603SL-D08-T ucs1603sg-d08-t dip-8 tube ? marking
ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r103-116.a ? pin configuration ? pin description pin no. pin name description 1 v cc -g supply voltage 2 v cc supply voltage 3 fb feedback 4 cs current sense input 5 drain power mosfet drain 6 drain power mosfet drain 7 gnd ground 8 gnd ground ? block diagram notes: olp (over load protection) ovp (over voltage protection) otp (over temperature protection) ocp (over current protection) uvlo (under voltage latch-out) leb (led edge blanking)
ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r103-116.a ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 32 v input voltage to fb pin v fb -0.3 ~ 6.5 v input voltage to cs pin v cs -0.3 ~ 6.5 v junction temperature t j +150 c operating temperature t opr -40 ~ +125 c storage temperature t stg -50 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? operating range parameter symbol ratings unit supply voltage v cc 10 ~ 24 v v cc-g pin series resistor v cc_gr 51 ~ 510 ? open frame output power for 85~264vac p in_max 18 w ? electrical characteristics (t a =25c, v cc =15v, unless otherwise specified) parameter symbol test conditions min typ max unit supply section start up current i st v cc =v thd(on) -1v 2 15 a supply current with switch i op v fb =3.5v 3 5.5 ma v dd zener clamp current v clamp i vdd =20ma 28 30 32 v under-voltage lockout section start threshold voltage v thd(on) 18 20 22 v min. operating voltage v cc(min) 6.5 8 9.5 v control section feedback source current i fb v fb =0 240 a v fb open loop voltage level v fb_open 5.4 v burst-mode out fb voltage v fb(out) v cs =0 1.8 v burst-mode enter fb voltage v fb(in) v cs =0 1.6 v normal initial v fb =3.5v 60 65 70 khz switching frequency burst mode base frequency f (sw) 20 khz duty cycle d max v fb =3.5v, v cs =0 70 80 90 % frequency hopping f j(sw) -9 +9 % frequency variation vs. v cc deviation f dv v cc =10 ~ 20v 10 % frequency variation vs. temperature deviation f dt t=-40 ~ 110c 10 % soft-start time t softs 5 ms protection section ovp threshold v ovp v fb =3.5v 25 27 29 v olp threshold v fb(olp) v cs =0 4.2 v delay time of olp t d-olp 60 88 120 ms otp threshold t (thr) 140 c current limiting section leading edge blanking time t leb 200 350 550 ns peak current limitation v sense-h v fb =3.9v 0.92 v threshold voltage for valley v sense-l v fb =3.9v 0.68 0.74 0.8 v power mos-transistor section drain-source breakdown voltage v dss v gs =0v, i d =250 a 600 v drain-source diode continuous source current i s 5.5 a static drain-source on-state resistance r ds(on) v gs =10v, i d =1.1a 2 ? notes: 1. pulse test: pulse width 300 s, duty cycle 2%. 2. essentially independent of operating temperature.
ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r103-116.a ? functional description the internal reference voltages and bias circuit work at v cc > v thd(on) , and shutdown at v cc ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r103-116.a ? functional description (cont.) (4) constant output power limit when the primary current, across the primary wind of tran sformer, reaches the limit current, the output gate driver will be turned off after a small propagation delay t d . this propagation delay will introduce an additional current proportional to t d v in /lp. since the propagation dela y is nearly constant regardle ss of the input line voltage v in . higher input line voltage will result in a larger additional cu rrent and hence the output power lim it is also higher than that under low input line voltage. to co mpensate for this output power limit variation across a wide ac input range, the threshold voltage is adjusted by adding a positive ramp. this ramp signal rises from v sense-l to v sense_h , and then flattens out at v sense_h . a smaller threshold voltage forces the out put gate drive to terminate earlier. this reduces the total pwm turn-on time and makes the output po wer equal to that of low line input. this proprietary internal compensation ensures a constant output power limit for a wide ac input voltage range (90vac to 264vac). (5) protection section the ic takes on more protection functions such as olp, ovp and otp etc. in case of those failure modes for continual blanking time, the driv er is shut down. at the same time, ic enters auto-restart, v cc power on and driver is reset after v cc power on again. olp after power on, ic will shutdown driver if over load state occurs for continual t d-olp . olp case as followed fig.5. ovp ovp will shutdown the switching of the power mosfet whenever v cc > v ovp . the ovp case as followed fig.6. fig.5 olp case fig.6 ovp case otp otp will shut down driver when junction temperature t j >t (thr) for continual a blanking time.
ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r103-116.a ? functional description (cont.) (6) driver output section the driver-stage drives the gate of the mosfet and is optimized to minimize emi and to provide high circuit efficiency. this is done by reducing the switch on slope when reaching the mosfet threshold. this is achieved by a slope control of the rising edge at the dr iver?s output. the output driver is clam ped by an internal 16v zener diode in order to protect power mosfet transistors against undesirable gate over voltage. in addition to the gate drive contro l scheme mentioned, the gat e drive strength can also be adjusted externally by a resistor connected between v dd and v ddg , the falling edge of the dr ain output can be well controlled. it provides great flexibility for system emi design. (7) inside power switch mos transistor specific power mos transistor parameter is as ?power mos transistor section? in electrical characteristics table.
ucs1603s preliminary linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r103-116.a ? typical application circuit f1 line neut 8 9 10 1 2 3 4 l2 12v/1.33a gnd 7 3 5 ic1 6 7 4 3 1 2 l1 1 2 3 4 t1 ic3 ic2 bd1 znr1 1 2 3 4 16w gnd drain drain fb 6 2 v cc xc1 r1 r2 c1 r3 d1 c2 cy1 r6 c8 c4 d2 c10 c7 d3 c3 r17 c9 r14 r8 r9 r10 gnd 8 v cc-g 1 r g cs r cs 4 r7 fig.7 utc ucs1603s typical application circuit utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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