unisonic technologies co., ltd ups4602 linear integrated circuit www.unisonic.com.tw 1 of 10 copyright ? 2011 unisonic technologies co., ltd qw-r119-019.a high performance current mode power switch with zero current detection ? description the utc ups4602 is an integrated pwm controller and powermosfet specifically design ed for switching operation with minimal external components. the utc ups4602 is designed to provide several special enhancements to satisfy the needs, for example, power-saving mode for low standby power ( < 0.3w), frequency hopping , constant output power limiting , slope compensation ,over current protecti on (ocp), over voltage protection (ovp), over load protection (olp), under voltage lock out (uvlo), short circuit protection (scp) , ov er temperature protection (otp), etc. ic will be shutdown or ca n auto-restart in situations. ? feature * internal powermosfet (650v) * programming gate driver capability * frequency hopping for improved emi performance. * lower than 0.3w standby power design * linearly decreasing frequency to 26khz during light load * internal soft start * internal slope compensation * constant power limiting for universal ac input range * gate output maximum voltage clamp(15v) * over temperature protection * overload protection * over voltage protection * leading edge blanking * cycle-by-cycle current limiting * under voltage lock out * short circuit protection dip-8 ? ordering information ordering number lead free halogen free package packing UPS4602L-D08-T ups4602g-d08-t dip-8 tube UPS4602L-D08-T (1)packing type (2)package type (1) t: tube (2) d08: dip-8 (3) g: halogen free, l: lead free (3)lead free
ups4602 linear integrated circuit unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r119-019.a ? pin configuration 1 gnd vcc-g drain vcc drain fb 2 3 4 5 6 7 8 cs gnd ? pin description pin no. pin name description 1 vcc-g supply voltage 2 vcc 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
ups4602 linear integrated circuit unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r119-019.a ? 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)
ups4602 linear integrated circuit unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r119-019.a ? absolute maximum rating (ta=25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 30 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 8.6 ~ 22 v
ups4602 linear integrated circuit unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r119-019.a ? electrical characteristics (ta 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 22 45 a supply current with switch i op v fb = 4v 8 10 ma under-voltage lockout section start threshold voltage v thd(on) 13.5 14.2 15 v min. operating voltage v cc(min) 7.5 8.2 9 v hysteresis v cc(hy) 6 v internal voltage reference reference voltage v ref guarantee by des ign 6.3 6.5 6.7 v control section feedback source current i fb v fb =0 1.1 ma v fb operating level v fbmax 3.5 v burst-mode out fb voltage v fb(out) v cs =0 1.1 v reduce-frequency end fb voltage v fb(end) v cs =0 1.2 v burst-mode enter fb voltage v fb(in) v cs =0 0.9 v normal initial v fb = 4v 45 50 55 khz switching frequency power-saving f (sw) before enter burst mode 20 30 khz duty cycle d max v fb =4v, v cs =0 64 72 80 % frequency hopping f j(sw) 2.5 4 5.5 khz frequency variation vs v cc deviation f dv v cc =10 to 20v 5 % frequency variation vs temperature deviation f dt t=-25 to 105c 5 % soft-start time t softs 2 4 6 ms protection section ovp threshold v ovp v fb =4v 23 v olp threshold v fb(olp) v cs =0 3.7 v delay time of olp t d-olp c fb =47nf(from v fb =3.7v to drain off) 35 65 95 ms otp threshold t (thr) 120 135 155 c current limiting section leading edge blanking time t leb 270 350 450 ns peak current limitation v cs v fb =4v 0.88 0.95 1.03 v threshold voltage for valley v sense-l v fb =4v 0.75 v power mos-transistor section drain-source breakdown voltage v dss v gs =0v, i d =250 a 650 v turn-on voltage between gate and source v th v ds =v gs , i d =250 a 2 4 v drain-source diode continuous source current i s 2 a static drain-source on-state resistance r ds(on) v gs =10v,i d =2.25a 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 notes: 1. pulse test: pulse width 300 s, duty cycle 2% 2. essentially independent of operating temperature
ups4602 linear integrated circuit unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r119-019.a ? functional description the internal reference voltages and bias circuit work at v cc > v thd(on) , and shutdown at v cc ups4602 linear integrated circuit unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r119-019.a ? functional description(cont.) (3) internal synchronized slope compensation built-in slope compensation circuit adds voltage ra mp onto the current sens e input voltage for pwm generation, this greatly improves t he close loop stability at ccm and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage. (4) frequency hopping for emi improvement the frequency hopping is implemented in the ic; there are two oscillators built-in the ic. the first oscillator is to set the normal switching frequency; the switching frequ ency is modulated with a period signal generated by the 2nd oscillator. the relation betwe en the first oscillator and t he 2nd oscillator as followed fig.5. so the tone energy is evenly spread out, the spread spectrum minimizes the conduction band emi and therefor e eases the system design in meeting stringent emi requirement. fig.5 frequency hopping (5) constant output power limit when the primary current, across the pr imary wind of transfer, reaches the limit current, around 1.2a, the output gate drive 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 delay is nearly co nstant regardless of the input line voltage v in . higher input line voltage will result in a larger additional current and hence the output power limit is also higher than that under low input line voltage. to compensate for this output pow er limit variation across a wide ac input range, the threshold voltage is adjust ed by adding a positive ramp. this ramp signal rises from 0.75v to 0.95v, and then flattens out at 0.95v. a smaller threshold voltage forces the outpu t 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). (6) 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.6. the test circuit as followed fig.8. t d-olp 2c fb /1.4 . ovp ovp will shutdown the switching of the power mosfet whenever v cc > v ovp . the ovp case as followed fig.7. the test circuit as followed fig.9.
ups4602 linear integrated circuit unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r119-019.a ? functional description(cont.) fig.6 olp case fig.7 ovp case ups4602 470u 2 1 3 4 7 8 6 5 33n ic3 v cc 15v v fb 3v 47nf v cc v thd(on) 5.6v 0 0 t d-olp t t t v drain 500 ? /1w fig.8 olp test circuit fig.9 ovp test circuit otp otp will shut down driver when junction temperature t j >t (thr) for continual a blanking time. (7) 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. (8) inside power switch mos transistor specific power mos transistor parameter is as ?power mos transistor section? in electrical characteristics table.
ups4602 linear integrated circuit unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r119-019.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 r5 r3 d1 c2 yc1 r6 c8 c4 d2 c10 c7 d3 c3 r17 c9 r14 r8 r9 r10 gnd 8 vcc-g 1 r g cs r cs 4 r7 fig.10 utc ups4602 typical application circuit table1. components reference description for utc ups4602 application circuit designator part type designator part type designator part type c1 33 f r1 2.2m ? d1 rs1m c2 0.001 f r2 2.2m ? d2 sr39 c3 22 f r3 100k ? d3 rs1d c4 470 f r5 2m ? ic1 ups4602 c7 0.01 f r6 30 ? ic2 pc-817 c8 0.001 f r7 15 ? ic3 tl431 c9 0.1 f r8 4.7k ? yc1 102p/400v c10 470 f r9 3.92k ? t1 ee22 r10 15k ? l1 uu9.8 r14 1.8k ? l2 2 h r17 510 ? f1 1a/250v r g 0 ? znr1 7d471k r cs 1 ? xc1 0.1 f/250v bd1 kbp205
ups4602 linear integrated circuit unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r119-019.a ? typical characteristics input power (mw) frequency(khz) 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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