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200801173 this datasheet contains new product information. advanced power electronics corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. APE1705 150khz, 3a pwm buck dc/dc converter ? general description the APE1705 series are monolithic ic designed for a step-down dc/dc converter, and own the ability of driving a 3a load wi thout additional transistor. it saves board space. the external shutdown function can be controlled by logic level and then come into standby mode. the internal compens ation makes feedback control having good line and load regulation without external design. regarding protected function, thermal shutdown is to prevent over te mperature operating from damage, and current limit is against over current operating of the output switch. if cu rrent limit function occurs and v fb is down below 0.5v, the swit ching frequency will be reduced. the APE1705 series operates at a switching frequency of 150khz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators. other feat ures include a guaranteed ? 4% tolerance on output voltage under specified input voltage and output load conditions, and ? 15% on the oscillator frequency. the output version included fixed 3.3v, 5v, 12v, and an adjustable type. the chips are available in a 5-lead to-263 and 5-lead to-220 package. ? features - output voltage: 3.3v, 5v, 12v and adjustable output version. - adjustable version output vo ltage range, 1.23v to 38.5v. - 150khz ? 15% fixed switching frequency. - voltage mode non-synchronous pwm control. - thermal-shutdown and current-limit protection. - on/off shutdown control input. - short circuit protect (scp). - operating voltage can be up to 40v. - output load current: 3a. - 5-lead to-263 and to-220 pb-free packages. - low power standby mode. - built-in switching transistor on chip. adva nced power electronics corp. 1
2 APE1705 ? block diagram 15 0 k hz os c. star t up + + _ + _ th er m a l sh utd o w n co n t ro l + dr iv er co mp . co mp . vs s sw en fb 20 0 m v 22 0 m v 3a switch _ co mp . v cc cu r r e n t li m i t + _ am p com p . cur re nt s o ur ce bi a s 1. 2 35v r e fe re nc e 2.5v re g u l a t o r r2 r1 adj : r2=0 ? , r1= o pen ? pin assi gnment the package of APE1705 are to263-5l and to220-5l(r); t he pin assignment is given by: name description v cc operating voltage input sw switching output v ss gnd pin fb output voltage feedback control to263-5l ( top view ) 1 v cc 5 en 4 fb/out 3 v ss 2 sw metal tab gnd ( side view ) en on/off shutdown 1 v cc 4 fb/out 3 v ss 2 sw metal tab gnd ( top view ) ( side view ) to220-5l 5 en metal tab gnd ( top view ) ( side view ) to220-5lr 1 v cc 4 fb/out 3 v ss 2 sw 5 en 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp. out output voltage feedback control for adj version
3 APE1705 ? order informa t ion order information APE1705x -xx package type s: to263-5l p :to220-5l pr:to220-5l-r 33:3.3v 50:5.0v 12: 12v blank:adj output voltage ? marking informa t ion t op marking adj ywwsss 1705x id code : int e rnal ww : 01~52 y e a r : 6 = 2006 p a rt num be r f i x ywwsss 1705x output v o ltage id code : internal ww: 0 1 ~ 5 2 year : 6 = 2006 -50 part number 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
4 APE1705 ? absol u te maximum ratings c h a r a c t e r i s t i c s s y m b o l r a t i n g u n i t maximum supply voltage v cc + 4 5 v on/off pin input voltage v en -0.3 to 40 v feedback pin voltage (for adj version) v fb -0.3 to 20 v output voltage to ground (for fixed version) v out 0.7 to 45 v power diss ipation internally limited pd ( t j -t a ) /
operating temperature range t op -40 to +125
operating supply voltage v op +4.5 to +40 v thermal resistance from junction to case
thermal resistance from junction to ambient
not e : ja is measured with the pcb copper area(need conn ect to v ss pin s ) of approximately 3 in 2 (multi-lay er). ? electrical charact e ristics (unl ess otherwise sp ecified, t a =25c, v cc =12v for 3.3v , 5v , adjustable version and v cc =18v for the 12v version. iload = 0.2 a ) char a c te risti c s s y mbol c o n d i t i o n s m i n t y p m a x units qui e sc ent c u rr ent i ccq v fb =12v forc e driv er of f 4 8 ma -50 fee d b a ck bi as curre nt i fb v fb =1.3v (adj ust abl e v e r s io n o n ly) - 1 0 -100 na 20 0 shut do w n su p p ly c u rr ent i sd en p i n= 5v v cc =40v 1 0 0 30 0 ua oscil l at or freq u enc y f osc 1 2 7 15 0 17 3 k h z (adj ust abl e) w h e n v fb <0.5v 6 0 k h z oscilla t o r frequ en cy o f short circu i t pr otect f scp (fixed)when < v out *4 0 % 6 0 k h z max. duty cycle (on) v fb =0v force d r iver on 10 0 min. duty cycle (off) dc v fb =12v forc e driv er of f 0 % curr ent l i mit i cl pear current, no outside circuit v fb =0v forc e driv er o n 3 . 5 a lo ad re g u l a tio n ( v ? out /v out ) v ? out i out = 0.2 to 3a - 0.6 1.2 % 1.4 satur a ti on v o lt ag e v sa t i out =3a, no ou tsid e circ uit v fb =0v force d r iver on 1 . 3 1.5 v sw pi n=0v no outs i d e circ uit v fb =12v forc e driv er of f - 2 0 0 ua sw pi n=-0.8 v sw pin lea k age current i sw l v cc =40 v forc e driv er of f -5 ma v il low (regulat o r on) - 0.6 en pin l o g i c in put t h re sh ol d volt ag e v ih hig h (r eg ul ator off) 2.0 1.3 - v en p i n l o gic i n put c u rre nt i h v en =2.5v (off ) -0.1 -5 en p i n i n put c u rrent i l v en =0.5v (o n) -0.01 -1 ua thermal shutdown t e mp t s d 13 5
150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
5 APE1705 ? electrical characteristics (continued) ve r s i o n c h a r a c te risti c s sy mbol c o n d i t i o n s m i n t y p m a x u n i t s output feedback voltage v fb 4.5v < v cc < 4 0 v 0. 2a < i load < 3 a v out programmed for 3v 1.193 /1.180 1.2 3 1.267 /1.280 v APE1705-adj efficienc y ? v cc = 12 v, i load =3a 74 % output voltag e v ou t 4.75v < v cc < 40v 0.2a < i load < 3a 3.168 /3.135 3.3 3.432 /3.465 v APE1705-3.3v efficienc y ? v cc = 12 v, i load =3a 7 5 % output voltag e v ou t 7v < v cc < 40 v 0.2a < i load < 3a 4.80 /4.75 5.0 5.20 /5.25 v APE1705-5.0v efficienc y ? v cc = 12 v, i load =3a 80 % output voltag e v ou t 15v < v cc < 4 0 v 0.2a < i load < 3a 11.52 /11.40 12 12.48 /12.60 v APE1705-12v efficienc y ? v cc = 24 v, i load = 3a 8 9 % specific ations with boldface type are for fu ll operating temperature range, the other type are for tj=25oc. 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
6 APE1705 ? applicati on circuit (1) vin=12v c2 0. 1 u f d1 b 3 40a l1 33 uh 1 2 c3 470 uf c1 47 0uf u1 1 2 3 4 5 vc c sw fb en vs s vo ut =5. 0 v/ 3a vin = 1 2 v on / o f f c6 0 . 1uf r2 1. 5 k r1 4. 7 k (2) vin=24v c2 0. 1uf d1 b340 a l1 47 uh 1 2 c3 4 70u f c1 4 70u f u1 1 2 3 4 5 vcc sw fb en vss v out =5. 0 v / 3a v i n=24v c6 0. 1 u f r2 1.5 k r1 4.7 k v out = v fb
7 APE1705 ? functi on de scripti ons pin functions vcc this is the positive input supply for the ic switching regulator . a suitable input bypass capac itor must be pres ented at this pin to minimi ze voltage transients and to supply the switching currents needed by the regulator . vss circuit ground. sw internal switch. the voltage at this pin switches between (+v cc ? v sa t ) and approximately ? 0.5v , with a duty cycle of approximately v out / v cc . t o minimize coupling to sensitive circuitry , the pc board copper area connected to this pin should be minimized. feedback senses the regulated output voltage to complete the feedback loop. en allows the switching regulator circuit to be shutdown using logic lev e l signals thus dropping the total input supply current to approximately 100ua. pulling this pin below a threshold v o ltage of approximately 1.3v turns the regulator on, and pulling this pin above 1.3v (up to a maximum of vcc) shut s the regulator down. if this shutdown feature is not needed, the en pin can be wired to the ground pin. thermal considerations the to-263-5l package needs a heat sink under most conditions. the size of the heat sink depends on the i nput voltage, the output vol t age, the load current and the ambient temperature. the APE1705 junction temperature rises above ambient temperature for a 3a load and di f f erent input and output voltages. the data for these curves was taken with the APE1705 (to263-5l package) operating as a buck-switching regulator in an ambient te mperature of 25
(still air). these temperature increments are all approximate and are af fected by many factors. higher ambient temperatures requires more heat sinker . 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
8 APE1705 ? functi on de scripti ons (c ont inued) for the best thermal performance, wi de copper traces and gen erous amounts of printed circuit board copper (need connect to the v ss pins) should be used in the board layout, (one exception is the sw(swi tch) pin, which should not have large areas of copper .) large areas of copper pr ovide the best transfer of heat (lower thermal resistance) to the surrounding ai r , and moving air lowers the thermal resistance even further . package thermal resistance and juncti on temperature in crements are all approximate. the increm ents are af fected by a lot of fa ctors. some of these factors include board size, shape, thickness, posit ion, location, and even board temperature. other factors are, tr ace width, total printed circui t copper area, copper thickness, single or double-sided, mu lti-layer board and the amount of solder on the board. the ef fectiveness of the pc board to dissipate heat also depends on the size, quantity and spacing of other components on t he board, as well as whether the surrounding air is still or moving. furthermore, some of these com ponents such as the catch diode will add heat to the pc boar d and the he at can vary a s the input vo ltage changes. for the inductor, d epending on t he physica l size, type of cor e material and the dc resistance , it could eith er act as a h eat sink takin g heat a w ay f r om the board, or it could add hea t to the board. 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
9 APE1705 ? typical characteristics output ripple ( v in =12v , v out =5v , i out =3a) po w e r on te st w a v e (v in =12v , v ou t =5v , i out =3a ) load t r ansie n t re spons e ( v in =12v , v out =5v , i out =0. 2 ~3 a) en on tes t w a v e (v in =12v , v ou t =5v , i out =3a ) efficiency (v in =12v , v ou t =5. 0 v ) efficiency (v in =24v , v ou t =5. 0 v ) v i n= 12 v 0% 10 % 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 0. 0 0 . 5 1. 0 1 . 5 2. 0 2 . 5 3. 0 io u t ( a ) ef f i ci e n cy(% ) vi n = 1 2 v 0% 10 % 20 % 30 % 40 % 50 % 60 % 70 % 80 % 90 % 0 . 0 0 .5 1 . 0 1 .5 2 . 0 2 .5 3 . 0 io u t ( a ) ef f i ci e n cy( % ) v in v out i sw sw v out (a c ) i sw sw v out (a c ) i sw v out v in sw i sw sw 150khz, 3a pwm buck dc/dc converter adva nced power electronics corp.
package outline : to-263-5l millimeters min nom max a 4.40 4.60 4.80 b 0.66 0.79 0.91 l4 0.00 0.15 0.30 c 0.36 0.43 0.50 l1 2.29 2.54 2.79 e 9.80 10.10 10.40 e1 c2 1.25 1.35 1.45 l2 d 8.60 8.80 9.00 d1 e l 14.60 15.20 15.80 0 4 8 1.all dimensions are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : to-263-5l 1705s-xx ywwsss part numbe r ywwsss logo date code (ywwsss) y output voltage 10
package outline : to-220-5l millimeters min nom max a 4.07 4.45 4.82 b 0.76 0.89 1.02 c 0.36 0.50 0.64 d 14.22 14.86 15.50 e 9.78 10.16 10.54 e 1.57 1.71 1.85 e1 6.68 6.81 6.93 f 1.14 1.27 1.40 h1 5.46 6.16 6.86 j1 2.29 2.74 3.18 l 13.21 13.97 14.73 3.68 3.81 3.94 2.54 2.73 2.92 1.all dimensions are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : to-220-5l q p output voltage 1705p-xx date code (ywwsss) y package code 11
package outline : to-220-5lr millimeters min nom max a 4.40 4.6 4.70 b 0.70 0.80 0.90 d 8.40 8.70 8.90 d1 d2 e 9.91 10.16 10.41 e 1.60 1.70 1.80 f 1.20 1.25 1.30 h1 h2 20.8 21.60 22.4 h3 23.90 24.70 25.50 j1 3.7 4.50 5.3 j2 q 2.50 2.80 3.00 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : to-220-5lr advanced power electronics corp. symbols 8.40 1.00 6.30 6.40 part number 1705 pr - xx package code ywwsss date code (ywwsss) y ?last digit of the year ww ?week sss ?sequence output voltage logo 12

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