unisonic technologies co., ltd ua7527 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r114-003.b power factor controller ? description the utc ua7527 is a simple and high performance active power factor corrective controller for boost pfc application which operates in the critical conduction mode. the utc ua7527 is optimized for electronic ballasts, low power and high density power supplies which require minimum board area reduced component count and low power di ssipation. internal r/c filter eliminates the need for an external r/c filter. special circuitry has also been added to prevent no load runaway conditions. the output drive clamping circuit lim its the overshoot of the power mosfet gate drive despite the su pply voltage. this greatly enhances the system reliability. ? features * internal start-up timer * very precise adjustable output over voltage protection * zero current detector * quadrant multiplier * internal r/c filter eliminates the need for an external r/c filter * trimmed 1.5% internal band gap reference * under voltage lockout with 3v of hysteresis * totem pole output with high state clamp * low start-up and operating current sop-8 ? ordering information ordering number package packing lead free halogen free UA7527L-S08-R ua7527g-s08-r sop-8 tape reel ua7527l-s08-t ua7527g-s08-t sop-8 tube
ua7527 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r114-003.b ? pin configuration ? pin description pin no. pin name description 1 inv the inverting input of the error amplifier. the output of the boost converter should be resistively divided to 2.5v an d connected to this pin. 2 ea_out the error amplifier output. a feedback compensation network is placed between this pin and the inv pin. 3 mult input to the multiplier stage. full-wave rectified ac voltage is divided into a voltage less than 2v and is connected to this pin. 4 cs input of the pulse-width modul ation comparator. current is sensed in the boost stage mosfet by a resistor in the source lead. an internal r / c filter can filter out any high frequency noise. 5 i det input to zero current detection. 6 gnd the ic ground. 7 out gate driver output. this pin provides an output to an external power mosfet with peak current of 500ma. 8 v cc the positive supply of the device.
ua7527 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r114-003.b ? block diagram
ua7527 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r114-003.b ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc 30 v multiplier, error amp and comparator input voltages v in -0.3 ~ 6 v peak drive output current i oh , i ol 500 ma output clamping diodes current v o > v cc or v o < -0.3v l clamp 10 ma detect clamping diodes current l det 10 ma power dissipation p d 0.8 w junction temperature t j 150 c operating temperature t opr -25 ~ 125 c storage temperature t stg -65 ~ 150 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? temperature characteristics (-25c t a 125c) parameter symbol ratings unit temperature stability for reference voltage (v ref ) ? v ref 20 mv temperature stability for multiplier gain (k) ? k/ ? t -0.2 %/c ? electrical characteristics ( v cc = 14v, -25c t a 125c, unless otherwise specified. ) parameter symbol test conditions min typ max unit under voltage lockout section start threshold voltage v th ( st ) v cc increasing 10.5 11.5 12.5 v uv lockout hysteresis hy ( st ) 2 3 4 v supply current section start-up supply current i st v cc = v th ( st ) -0.2v 10 60 100 ua operating supply current i cc output not switching 3 6 ma operating current at ovp i cc ( ovp ) v inv = 3v 1.7 4 ma dynamic operating supply current i dcc 50khz, ci = 1nf 4 8 ma error amplifier section voltage feedback input threshold v ref i ref = 0ma, t a = 25c 2.465 2.5 2.535 v -25 t a 125c 2.44 2.5 2.56 v line regulation ? v ref1 14v v cc 25v 0.1 10 mv temperature stability of v ref (note 1) ? v ref3 -25 t a 125c 20 mv input bias current i b ( ea ) -0.5 0.5 ua output current i source v m2 = 4v -2 -4 ma i sink v m2 = 4v 2 4 ma output upper clamp voltage (note 2) v eao ( h ) i source = 0.1ma 6 v output lower clamp voltage (note 3) v eao ( l ) i sink = 0.1ma 2.25 v large signal open loop gain (note 4) g v 60 80 db power supply rejection ratio (note 5) psrr 14v v cc 25v 60 80 db unity gain bandwidth (note 6) gbw 1 mhz slew rate (note7) sr 0.6 v/us multiplier section input bias current (pin3) i b ( m ) -0.5 0.5 ua m1 input voltage range (pin3) ? v m1 0 3.8 v m2 input voltage range (pin2) ? v m2 v ref v ref +2.5 v multiplier gain (note8) k v m1 = 1v, v m2 = 3.5v 0.36 0.44 0.52 1/v maximum multiplier output voltage v oma x ( m ) v inv =0v, v m1 = 4v 1.65 1.8 1.95 v multiplier gain stability (note 9) ? k/ ? t -25 t a 125c -0.2 %/c
ua7527 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r114-003.b ? electrical characteristics(cont.) parameter symbol test conditions min typ max unit current sense section input offset voltage (note 8) v io ( cs ) v m1 =0v, v m2 = 2.2v -10 3 10 mv input bias current i b ( cs ) 0v v cs 1.7v -1 -0.1 1 ua current sense delay to output t d ( cs ) (note 11) 200 500 ns zero current detect section input voltage threshold v th ( det ) v det increasing 1.7 2 2.3 v detect hysteresis hy ( det ) 0.2 0.5 0.8 v input low clamp voltage v clamp i det = -100ua 0.45 0.75 1 v input high clamp voltage v clamp ) i det = 3ma 6.5 7.2 7.9 v input bias current i b ( det ) 1v v det 5v -1 -0.1 1 ua input high/low clamp diode current i clamp ( d ) (note 12) 3 ma output section output voltage high v oh i o = -10ma 10.5 11 v low v ol i o = 10ma 0.8 1 v rising time (note 13) t r c i = 1nf 130 200 ns falling time (note 14) t f c i = 1nf 50 120 ns maximum output voltage v oma x ( o ) v cc = 20v, i o = 100ua 12 14 16 v output voltage with uvlo activated v omin ( o ) v cc = 5v , i o = 100ua 1 v restart timer section restart time delay t d ( rst ) v m1 = 1v, v m2 = 3.5v 150 us over voltage protection section soft ovp detecting current i sovp 25 30 35 ua dynamic ovp detecting current i dovp 35 40 45 ua static ovp threshold voltage v ovp v inv = 2.7v 2.1 2.25 2.4 v notes: 1~14. these parameters, although guaranteed, are not 100% tested in production. multiplier gain: k= () ref m2 m1 v v v hold pin4_thres ? (v m1 =vpin3, v m2 =vpin2)
ua7527 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r114-003.b ? 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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