technical data 2011, february, rev. 0 1 power factor controllers the re are active power factor controllers specifically designed for use as a preconverter in electronic b allast and in off - line power converter applications. these integrated circuits feature an internal startup timer for stand - alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction opera tion, t ransconductance error amplifier, q uick start circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power mosfet. also included are protective features cons isting of an overvoltage comparator to eliminate runaway output voltage due to load removal, input undervoltage lockout with hysteresis, cycle - by - cycle current limiting, multiplier output clamp that limits maximum peak switch current, an rs latch for singl e pulse metering, and a drive output high state clamp for mosfet gate protection. these devices are available in dual - in - line and surface mount plastic packages. ? overvoltage comparator eliminates runaway output voltage ? internal startup timer ? one quadrant multiplier ? zero current detector ? trimmed 2% internal bandgap reference ? totem pole output with high state clamp ? undervoltage lockout with 6.0 v of hysteresis ? low startup and operating current ? supersedes functionality of sg3561, td a4817 and mc34262 il34262 ordering information il 34262n plastic il 34262d soic t a = 0 to 85 c for all packages . pin connections
il34262 2011, february, rev. 0 1 maximum ratings rating symbol value unit total power supply and zener current (icc + iz) 30 ma output current, source or sink lo 500 ma current sense, multiplier, and voltage feedback inputs vin - 1.0 to +10 v zero current detect input high state forward current low state reverse current iin 50 - 10 ma power dissipation and thermal characteristics n suffix, plastic package maximum power dissipation @ t a = 70c thermal resistance, junction - to - air d suffix, plastic pac kage maximum power dissipation @ t a = 70c thermal resistance, junction - to - air p d r ja p d r ja 800 100 450 178 mw c/w mw 0 c/w operating junction temperature tj +150 c operating ambient temperature t a 0 to + 85 c storage temperature tstg - 65 to +150 c * stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other condi tions beyond those indicated under ?recommended operating conditions? is not implied. exposure to absolute - maximum - rated conditions for extended periods may affect device reliability. electrical characteristics ( \ /cc =12 v, for min/max values t a is the operating ambient temperature range that applies unless otherwise noted.) characteristic symbol min max unit error amplifier voltage feedback input threshold t a =25c t a = t low to t high (vcc = 12 v to 28 v) v fb 2.465 2.44 2.535 2.54 v line regulation (v cc = 12 v to 28 v, t a = 25c) reg line ? 10 mv input bias current (v fb = 0 v) i ib ? - 0.5 a transconductance (t a = 25c) g m 80 130 mho output current source (v fb = 2.3 v) sink (v fb = 2.7 v) lo ? ? ? ? a output voltage swing high state (v fb = 2.3 v) low state (v fb = 2.7 v) v oh (ea) v ol (ea) 5.8 ? ? 2.4 v
il34262 2011, february, rev. 0 1 characteristic symbol min max unit overvoltage comparator voltage feedback input threshol d v fb (ov) 1.065 v fb 1.095 v fb v multiplier input bias current, pin 3 ( vfb = 0 v) i ib ? - 0.5 a input threshold, pin 2 vth(m) 1.05 v ol(ea) ? v dynamic input voltage range multiplier input (pin 3) compensation (pin 2) vpin3 vpin2 0 to 2.5 vth(m) to (v th(m)+1.0) ? ? v multiplier gain (vpin 3 = 0.5 v, vpin 2 = vth(m) + 1.0 v) k 0.43 0.87 1/v zero current detector input threshold voltage (vjn increasing) vth 1.33 1.87 v hysteresis (vin decreasing) v h 100 300 mv input clamp voltage high state (i det = + 3.0 ma) low state (i det = - 3.0 ma) v ih v il 6.1 0.3 ? 1.0 v current sense comparator input bias current (vpin 4 = 0 v) i ib ? - 1.0 a input offset voltage (vpm 2 = 1.6 v, vpm 3 = 0 v) v io ? 25 mv maximum current sense input threshold (note 1) v th (max) 1.3 1.8 v delay to output t phl(in/out) ? 400 ns drive output output voltage (v cc = 12 v) low state (i sink = 20 ma) (i sink = 200 ma) high state (i source = 20 ma) (i source = 200 ma) v ol v oh ? ? 9.8 7.8 0 .8 3.3 0.8 3.3 v output voltage (v cc = 30 v) high state (i source = 20 ma, c l = 15 pf) v o(max) 14 18 v output voltage rise time (c l 1.0 nf) t r ? 120 ns output voltage fall time (c l 1.0 nf) t f ? 120 ns output voltage with uvlo activated (vcc = 7.0 v,l s ink = 1.0ma) v o(uvlo) ? 0.5 v restart timer restart time delay tdly 200 ? s note 1: this parameter is measured with v fb =0v, and v pin3 =3.0v
il34262 2011, february, rev. 0 1 characteristic symbol min max unit undervoltage lockout startup threshold ( v cc increasing) v th(on) 11.5 14. 5 v minimum operating voltage after turn - on (v cc decreasing) v shutdown 7.0 9.0 v hysteresis v h 3.8 6.2 v total device power supply current startup (vcc = 7.0 v) operating dynamic operating (50 khz, c l = 1.0 nf) i cc ? 0.4 12 20 ma power supply zener voltage (ice = 25 ma) v z 30 ? v
il34262 2011, february, rev. 0 1 < design equations > application information the application circuits shown in figures 1, 2 and 3 reveal that few external components are required for a complete power factor preconverter. each circuit i s a peak detecting current - mode boost converter that operates in critical conduction mode with a fixed on - time and variable off - time. a major benefit of critical conduction operation is that the current loop is inherently stable, thus elimination the need for ramp compensation. the application in figure 1 operates over an input voltage range if 90 vac to 138 vac and provides an output power of 80w (230v at 350ma) with an associated power factor of approximately 0.998 at nominal line. figures 2 and 3 are uni versal input preconverter examples that operate over a continuous input voltage range of 90 vac to 268vac. figure 2 provides an output power of 175w (400v at 440ma) while figure 3 provides 450w (400v at 1.125a). both circuits have an observed worst - case po wer factor of approximately 0.989.
il34262 2011, february, rev. 0 1 figure 1. 80w power factor controller
il34262 2011, february, rev. 0 1 figure 2. 175w universal input power factor controller
il34262 2011, february, rev. 0 1 figure 3. 450w universal input power factor controller
il34262 2011, february, rev. 0 1 n suffix plastic dip (ms ? 001ba) symbol min max a 8.51 10.16 b 6.1 7.11 c 5.33 d 0.36 0.56 f 1.14 1.78 g h j 0 10 k 2.92 3.81 no tes : l 7.62 8.26 1. dimensions ?a?, ?b? do not include mold flash or protrusions. m 0.2 0.36 maximum mold flash or protrusions 0.25 mm (0.010) per side. n 0.38 dimens ion, mm 2.54 7.62 l h m j a b f g d se ati ng plane n k 0.25 (0.010) m t -t- c 1 8 4 5
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