unisonic technologies co., ltd upss1650 preliminary cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2013 unisonic technologies co., ltd qw-r502-947.d high precision cc/cv primary-side pwm power switch ? description the utc upss1650 is a primary control switch mode charger and adapter applications. the cont rolled variable is transferred by an auxiliary winding from the se condary to the primary side. the device integrates pwm controller to enhance the performance of discontinuous conduction mode (dcm) flyback converters. the utc upss1650 operates in primary-side sensing and regulation. opto-coupler and t l431 could be eliminated. it also provides off-time modulation to linearly decrease pwm frequency under light-load conditions so that low standby power can be achieved. the utc upss1650 achieves high precision cv/cc regulation and high power efficiency. it offers comprehensive protection coverage with auto-recovery features including cycle-by-cycle current limiting, v dd over voltage protection, v dd clamp, otp, leading edge blanking, v dd under voltage lockout, etc. ? features * built-in 600v power mosfet * 5% constant voltage regulation at universal ac input * high precision constant current r egulation at universal ac input * primary side control without tl431 and opto-coupler * programmable cv and cc regulation * programmable cable compensation in cv mode * flyback topology in dcm operation * frequency hopping to reduce system emi * built-in leading edge blanking dip-8 sop-8 * built-in primary winding inductance compensation * power on soft start * gate output maximum voltage clamped at 15v * cycle-by-cycle current limiting * over voltage protection * v dd under-voltage lockout ? ordering information ordering number package packing lead free halogen free UPSS1650L-D08-T upss1650g-d08-t dip-8 tube upss1650l-s08-r upss1650g-s08-r sop-8 tape reel UPSS1650L-D08-T (1)packing type (2)package type (1) t: tube, r: tape reel (2) d08: dip-8, s08: sop-8 (3) l: lead free, g: halogen free (3)halogen free
upss1650 preliminary cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-947.d ? pin configuration v dd comp inv cs gnd gnd drain drain 1 2 3 4 8 7 6 5 ? pin description pin no. pin name description 1 v dd power supply 2 comp loop compensation 3 inv the voltage feedback from the auxiliary winding 4 cs current sense input 5/6 drain power mosfet drain pin 7/8 gnd ground ? block diagram
upss1650 preliminary cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-947.d ? absolute maximum rating parameter symbol ratings unit drain voltage (off state) b vdss -0.3~bvdss v v dd zener clamp continuous current i dd 10 ma comp voltage v comp -0.3~7 v cs input voltage v cs -0.3~7 v inv input voltage v inv -0.3~7 v operating junction temperature t j -20~150 c storage temperature t stg -55~150 c notes: 1. 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. 2. drain pin connected 100mm 2 pcb copper clad. ? thermal characteristics parameter symbol ratings unit junction to ambient dip-8 ja 75 c/w sop-8 90 c/w ? output power table parameter ratings unit adapter (note) 230vac15% 6 w 85-264vac 5 w note: maximum practical continuous power in an adapter desi gn with sufficient drain pattern as a heat sink, at 50c ambient.
upss1650 preliminary cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-947.d ? electrical characteristics (t a =25c, v dd =15v, unless otherwise specified) parameter symbol test conditions min typ max unit supply section turn-on threshold voltage v th ( on ) 13.5 14.5 15.5 v turn-off threshold voltage v th ( off ) 8.5 9 9.5 v v dd ovp protection v dd _ ovp 26 v startup current i dd-st 5 20 a operating current i dd-op 1.6 2 ma green-mode operating current i dd-green 1.3 ma oscillator section maximum frequency f osc 50 55 60 khz minimum frequency at ccm f osc-cm-min 18 khz minimum frequency at no-load f osc-n-min 370 hz frequency hopping range f/freq 5.0 % frequency hopping period t fhr 3 ms frequency variation vs. v dd deviation f dv v dd =10~25v 1 2 % frequency variation vs. temperature deviation f dt t a =-20c~+150c 15 % inv section reference voltage for ea v vr 1.94 2.00 2.03 v reference voltage for ccm v vr _ ccm 0.5 v max. cable compensation current i cable _ ma x 42 ua current sense section current sense threshold voltage v cs 740 760 780 mv ocp propagation delay t d _ oc 90 200 ns leading edge blank time t leb 540 ns soft start time t ss 10 ms power mosfet section mosfet ds breakdown voltage b vdss 600 v on resistance r ds ( on ) 17 20 ? otp section threshold temperature of otp (note) t otp +140 c note: when the over-temperature protecti on is activated, the power system en ters auto restart mode and output is disabled.
upss1650 preliminary cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-947.d ? operation description the utc upss1650 is a primary control switch mode charge r and adapter applications. it operates in primary-side sensing and regulation. opto-coupler and tl43 1 could be eliminated. proprietary built-in cv and cc control can achieve high precision cv /cc performance. the devic e integrates pwm controller to enhance the performance of discontinuous conduction mode (dcm) flyback converters. startup control the v dd pin of utc upss1650 is connected to the line input through a re sistor. a large value startup resistor can be used to minimize the power loss in ap plication because the start current of utc upss1650 is very low. when the v dd voltage reaches v th(on) , the internal startup circuit is disabled and the ic turns on. operating current the operating current of utc upss1650 is as low as 1.6ma. good efficienc y and very low standby power can be achieved. constant voltage operation the output voltage is defined by the transmission ratio between the secondary and auxiliary winding. the utc upss1650 captures the auxiliary winding feedback voltage at in v pin and operates in constant-voltage (cv) mode to regulate the output voltage. the auxiliary voltage reflects the output voltage is given by: v ? + v n n = v o s a aux (1) where v indicates the drop vo ltage of the output diode. figure 2. auxiliary voltage waveform via a resistor divider connected betwe en the auxiliary winding and inv, the v aux is sampled at the tsampling end and it is hold until the next sampling. the sampled voltage is compared with 2. 0v reference voltage and the error is amplified. the error amplifier output reflec ts the load condition and controls the t off time and the ipk to regulate the output voltage, thus constant output volt age can be achieved. constant current operation when the sampled voltage is below 2.0v reference volt age and the error amplifier output reaches its maximum, thus utc upss1650 operates in constant-current (cc) mode. the cc point and maximum output power can be externally adjusted by external current sense resistor r cs. the larger rcs, the sma ller cc point is, and the smaller output power becomes.
upss1650 preliminary cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-947.d ? operation description(cont.) iout vout large rcs small rcs figure 3. adjustable output power by changing rcs figure 4. secondary current waveform in cc operation, the cc loop control function of utc upss1650 will keep a fixed proportion between secondary inductance de-magnetization time (tdemag) and switch ing cycle time (tsw). the fixed proportion is 2 1 = tsw tdemag (2) thus the output current is given by: ipk n n 4 1 = tsw tdemag ipk n n 2 1 = iout s p s p (3) programmable cable drop compensation utc upss1650 has a built-in cable voltage drop compensation to achieve good load regulati on. an offset voltage is generated at inv pin by an internal current flowing into the resistor divider. the current is inversely proportional to the voltage of comp pin. as a resul t, it is inversely proportional to the output load current. the voltage drop across the cable is compensated by this offset voltage at inv pin. it can also be programmed by adjusting the resistance of the divider to compensate the drop for various cable lines used. current sensing and leading edge blanking cycle-by-cycle current limiting is offered in utc upss1650 . the switch current is detected by a sense resistor into the cs pin. when the power switch is turned on, a tu rn-on spike will occur on this resistor. a 500ns leading-edge blanking is built in to avoid false-termi nation of the switching puls e so that the external rc filtering is no longer needed.
upss1650 preliminary cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-947.d ? operation description(cont.) protection control good power supply system reliability is achieved with its comprehensive protecti on features including v dd over-voltage protection, v dd clamp, gate clamp, power on soft start, cycle-by-cycle current limiting, short circuit protection, leading edge blanking, otp and uvlo, etc. v dd is supplied by transformer auxiliary winding output. the output of utc upss1650 is shutdown when v dd drops below v th(off) and the power converter enters po wer on start-up sequence thereafter. ? typical application circuit drain cs gnd inv comp v dd utc upss1650 l n vo is d1 co n s io n p n a r cs 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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