unisonic technologies co., ltd UPS1702 preliminary linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2013 unisonic technologies co., ltd qw-r911-020.c high performance current mode power switch ? description the utc UPS1702 is an integrated pwm controller and power mosfet specifically designed for current mode operation with minimal external components. the utc UPS1702 is designed to provide several special enhancements to satisfy the needs, for example, power-saving mode for low standby power (<0.3w), frequency hopping , cons tant output power limiting , over current protection (ocp), over voltage protection (ovp), under voltage lock out (uvlo), and over temperature protection (otp) etc. ic will be shutdown or can auto-restart in certain situations. ? feature * internal high voltage start-up circuit * internal 700v power mosfet * lower than 0.3w standby power design * gate output maximum voltage clamp(15v) * over temperature protection * over voltage protection * leading edge blanking * cycle-by-cycle current limiting * under voltage lock out dip-8 ? ordering information ordering number package packing lead free halogen free UPS1702l-d08-t UPS1702g-d08-t dip-8 tube (1) t: tube (2) d08: dip-8 (3) l: lead free, g: halogen free UPS1702l-d08-t (1) packing type (2) package type (3) lead free
UPS1702 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r911-020.c ? pin configuration 1 drain gnd drain v cc drain fb 2 3 4 5 6 7 8 drain gnd ? pin description pin no. pin name description 1 2 gnd ground 3 fb feedback 4 v cc supply voltage 5~8 drain power mosfet drain ? block diagram notes: otp (over temperature protection) ovp (over voltage protection) ocp (over current protection) uvlo (under voltage latch-out) leb (led edge blanking)
UPS1702 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r911-020.c ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit switching drain source voltage v ds ( sw ) 700 v supply voltage v cc 30 v feedback current i fb 3 ma 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 8.6 ~ 22 v ? electrical characteristics (t a 25c, v cc =15v, unless otherwise specified) parameter symbol test conditions min typ max unit supply section start up charge current i ch v ds =100v, v cc =0~v ccon 1 ma start up current i st v cc = v ccon -0.2v 6 45 a supply current with switch i op i fb =0.5ma, i d =50ma 2 6.5 ma under-voltage lockout section start threshold voltage v ccon 13.5 15 16.5 v min. operating voltage v ccoff 8 9 10 v internal voltage reference control section i fb to i d current gain g fb-d 560 feedback source shutdown current i fbsd 900 a fb pin input impedance r fb 1200 ? burst-mode out fb voltage v fb ( out ) 0.94 v burst-mode enter fb voltage v fb ( in ) 1.05 v normal initial switching frequency f ( sw ) 54 60 66 khz frequency deviation vs v cc f dv v cc =10 to 22v 5 % frequency deviation vs temperature f dt t a =-40 to 105c 5 % protection section ovp threshold v ovp 23 v otp threshold t ( thr ) 130 150 170 c current limiting section peak current limitation i lim v fb =0v 0.56 0.7 0.84 a minmum turn on time t on ( min ) 680 ns power mosfet section drain-source breakdown voltage v dss v fb =2v, i d =250 a 700 v turn-on voltage between gate and source v th v ds =v gs , i d =250 a 2 4 v off state drain current i dss v ds =500v, v fb =2v 100 ua static drain-source on-state resistance r ds ( on ) v gs =10v,i d =0.4a 5 ? rise time t r v dd =300v, i d =4.0a rg=25 ? (note 1, 2) 45 100 ns fall time t f 35 80 ns drain capacitance c oss v ds =25v 40 pf note: 1. pulse test: pulse width 300 s, duty cycle 2% 2. essentially independent of operating temperature
UPS1702 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r911-020.c ? functional description the internal reference voltages and bias circuit work at v cc > v thd(on) , and shutdown at v cc < v cc(min) . (1) high voltage start up switch circuit at startup, an internal high-voltage curre nt source supplies the internal bi as and charges the external capacitor connected to the v cc pin. when v cc reaches v thd (on) , the ic begins switching and the internal high-voltage current source is disabled. the ic continues its normal switching operation and the power is supplied from the auxiliary transformer winding unless v cc goes below the stop voltage of v cc(min) . (2) switching frequency limit the utc UPS1702 have a constant switch ing frequency of 60khz. (3) protection section the ic takes on more protection functions such as ov p 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. ovp ovp will shutdown the switching of the power mosfet whenever v cc > v ovp . the ovp case as followed fig. 1 the test circuit as followed fig. 2. utc UPS1702 470u 2 1 3 4 7 8 6 5 33n ic3 v cc 15v v cc drain v ovp 470u 33n v dd 15v 500 fig.1 ovp case fig.2 ovp test circuit otp otp will shut down driver and latch-off when junction temperature t j > t (thr) , and ic will be release on when temperature decreasing under t (thr) -30 and powering on again. (4) the gain of fb pin to drain current limiting i lim =g fb-d 0.23v(r2||r1) (5) 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 edg e at the driver?s output. the output driver is clamped by an internal 15v zener diode in order to protect power mosfet transisto rs against undesirable gate over voltage. (6) inside power mosfet specific power mosfet parameter is as ?power mo sfet section? in electrical characteristics table.
UPS1702 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r911-020.c ? typical application circuit 5v/1.6a gnd c12 c5 l2 r7 c9 d3 c4 10 yc1 7 1 4 3 1 2 ic3 ic2 r9 r8 r12 5 d1 r1 c8 c2 l1 2 3 1 4 c1 bd1 b6s f1 line neut c11 r11 r10 v cc drain drain drain drain source source fb utc UPS1702 5 6 7 8 c6 r5 2 1 3 4 ic1 c3 d2 2 3 t1 fig. 3 utc UPS1702 typical application circuit table1. components reference description for utc UPS1702 application circuit designator part type designator part type designator part type c1 10 f/400v r1 100k ? d1 fr107 c2 10 f/400v r5 6.8k ? d2 rs1d c3 10 f/50v r7 30 ? d3 sr39 c4 470 f/16v r8 2.2k ? ic1 UPS1702 c5 220 f/16v r9 510 ? ic2 pc-817 c6 103pf r10 5.1k ? ic3 tl431 c8 102pf/1kv r11 5.1k ? yc1 102pf/400v c9 102pf/100v r12 15k ? t1 ee-19 c11 103pf l1 1mh c12 103pf l2 2 h f1 1a/250v bd1 b6s 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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