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to our customers, old company name in catalogs and other documents on april 1 st , 2010, nec electronics corporation merged with renesas technology corporation, and renesas electronics corporation took over all the business of both companies. therefore, although the old company name remains in this document, it is a valid renesas electronics document. we appreciate your understanding. renesas electronics website: http://www.renesas.com april 1 st , 2010 renesas electronics corporation issued by: renesas electronics corporation (http://www.renesas.com) send any inquiries to http://www.renesas.com/inquiry.
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the information in this document is subject to change without notice. before using this document, please confirm that this is the latest version. not all products and/or types are available in every country. please check with an nec electronics sales representative for availability and additional information. bipolar analog integrated circuit pc494 switching regulator control circuit data sheet document no. g12649ej5v0ds00 (5th edition) date published august 2008 ns printed in japan 1988, 2000, 2008 the mark shows major revised points. the revised points can be easily searched by copying an "" in the pdf file and specifying it in the "find what:" field. description the pc494 is a pwm type switching regulator control circuit. included in this device are a 5 v voltage reference, dual error amplifiers, a variable frequency sawtooth-wave generating oscillator, a comparator for de ad-time control, a flip flop, dual alte rnating output switches, and a buffer to output source and sink currents. error amplifiers have wide common mode input voltage capability, and circuits for voltage feedback and over current protection are easy to configure. the pc494 can be applied to all types of sw itching regulators, including chopper type regulators. features ? 250 ma output buffer to output sink and source currents ? switchable operation mode between a single-end mode and a push-pull mode ? no double pulsing during transient condition ? adjustable dead-time (0 to 100%) ? internal 5 v output voltage reference circuit ? error amplifiers with phase-compensating function ? providing master-slave operation (synchronizing multiple ics) ? with malfunction prevention circuit for low level supply voltage ? package variations available for different applications
data sheet g12649ej5v0ds00 2 pc494 ordering information part number package package type pc494c 16-pin plastic dip (7.62 mm (300)) ? plastic magazine pc494gs 16-pin plastic sop (7.62 mm (300)) ? plastic magazine pc494gs-e1 16-pin plastic sop (7.62 mm (300)) ? embossed taping ? pin 1 on draw-out side ? 2500 pcs/reel pc494gs-e2 16-pin plastic sop (7.62 mm (300)) ? embossed taping ? pin 1 at take-up side ? 2500 pcs/reel pc494gt-a note 16-pin plastic sop (9.53 mm (375)) ? plastic magazine pc494gt-e1-a note 16-pin plastic sop (9.53 mm (375)) ? embossed taping ? pin 1 on draw-out side ? 1500 pcs/reel pc494gt-e2-a note 16-pin plastic sop (9.53 mm (375)) ? embossed taping ? pin 1 at take-up side ? 1500 pcs/reel pc494gs-a note 16-pin plastic sop (7.62 mm (300)) ? plastic magazine pc494gs-e1-a note 16-pin plastic sop (7.62 mm (300)) ? embossed taping ? pin 1 on draw-out side ? 2500 pcs/reel pc494gs-e2-a note 16-pin plastic sop (7.62 mm (300)) ? embossed taping ? pin 1 at take-up side ? 2500 pcs/reel note pb-free (this product does not contain pb in the external electrode and other parts.)
data sheet g12649ej5v0ds00 3 pc494 block diagram 12 v cc 8c 1 9e 1 11 c 2 10 e 2 14 ref out 7 gnd 6 r t 5 13 c t 4 dead-time control 1 non-inv. input 2 inv. input 16 non-inv. input 15 inv. input 3 feed-back + reference regulator low voltage stop oscillator dead-time comparator ea i ea ii pwm comparator output control f / f t + + + ? ? ? ? pin configuration (top view) ? pc494c, 494gs, 494gt-a, 494gs-a 1 2 3 4 5 6 7 8 non-inv. input inv. input feed-back c t r t gnd c 1 non-inv. input inv. input ref out output control v cc c 2 e 2 e 1 16 15 14 13 12 11 10 9 dead-time control
data sheet g12649ej5v0ds00 4 pc494 absolute maximum ratings (t a = 25 c, unless otherwise noted) characteristics symbol pc494c pc494gs pc494gt-a pc494gs-a unit supply voltage v cc ? 0.3 to +41 v error amplifier input voltage v icm ? 0.3 to v cc +0.3 v dead-time comparator input voltage v dtc ? 0.3 to +5.25 v output voltage v cer ? 0.3 to +41 v output current i c 250 ma total power dissipation p t 1000 650 note 780 note 650 note mw operating ambient temperature t a ? 20 to +85 c storage temperature t stg ? 65 to +150 c note with 5 cm x 5 cm x 1.6 mmt glass-epoxy substrate. caution product quality may suffer if the absolute maximum rating is exceeded even momentarily for any parameter. that is, the absolute maximum ratings are rated value s at which the product is on the verge of suffering physical damage , and therefore the product must be used under conditions that ensure that the absolute m aximum ratings are not exceeded. recommended operating conditions characteristics symbol min. typ. max. unit supply voltage v cc 7 40 v output voltage v cer ? 0.3 +40 v output current (per output stage) i c 200 ma error amplifier sink current i oamp ? 0.3 ma timing capacitor c t 0.47 10000 nf timing resistance r t 1.8 500 k oscillation frequency f osc 1 300 khz operating ambient temperature t a ? 20 +70 c caution the recommended operating range may be exceeded without causing any problems provided that the absolute maximum ratings are not exceeded. however, if the d evice is operated in a way that exceeds the recomm ended operating conditions, the margin between the actual conditions of use and the absolute maximum ratings is small, and therefore thorou gh evaluation is necessary. the recommended operating conditions do not imply that the device can be used with all values at their maximum values.
data sheet g12649ej5v0ds00 5 pc494 electrical specifications (v cc = 15 v, f = 10 khz, ? 20 c t a +70 c, unless otherwise noted) (1/2) block characteristics symbol conditions min. typ. note1 max. unit output voltage v ref i ref = 1 ma, t a = 25 c 4.75 5 5.25 v line regulation reg in 7 v v cc 40 v, i ref = 1 ma, t a = 25 c 8 25 mv load regulation reg l 1 ma i ref 10 ma, t a = 25 c 1 15 mv temperature coefficient v ref / t ? 20 c t a +85 c, i ref = 1 ma 0.01 0.03 %/ c reference section short circuit output current note2 i short v ref = 0 v 50 ma frequency f osc c t = 0.01 f, r t = 12 k 10 khz standard deviation of frequency note3 7 v v cc 40 v, t a = 25 c, under recommended operating conditions of c t and r t constants. 10 % frequency change with voltage 7 v v cc 40 v, t a = 25 c, c t = 0.01 f, r t = 12 k 1 % oscillator section frequency change with temperature 0 c t a 70 c, c t = 0.01 f, r t = 12 k 1 2 % input bias current 0 v v dtc 5.25 v ? 2 ? 10 a maximum duty cycle (each output) v dtc = 0 v 45 49 % input threshold voltage 1 v th1 output pulse 0% duty cycle 3 3.3 v dead- time control section input threshold voltage 2 v th2 output pulse maximum duty cycle 0 v input offset voltage v io v oamp = 2.5 v 2 10 mv input offset current i io v oamp = 2.5 v 25 250 na input bias current v oamp = 2.5 v 0.2 1 a low level ? 0.3 common mode input voltage high level v icm 7 v v cc 40 v v cc ? 2 v open loop voltage gain a v v oamp = 0.5 to 3.5 v, t a = 25 c 60 80 db unity gain bandwidth t a = 25 c 500 830 khz common mode rejection ratio cmr v cc = 40 v, t a = 25 c 65 80 db output sink current v oamp = 0.7 v 0.3 0.7 ma error amplifier 1, 2 section output source current v oamp = 3.5 v ? 2 ? 10 ma input threshold voltage (pin 3) output pulse 0% duty cycle, see figure 1 . 4 4.5 v pwm section input sink current v (pin 3) = 0.7 v 0.3 0.7 ma notes 1. the typ. values are values at t a = 25 c, except for the characteristics of temperature. 2. the short circuit output current flow must be terminated within 1 second. repeated operations are allowed while internal heat accumulation is within a safe range. 3. standard deviation is a measure of t he statistical distribution about the mean as derived from the formula; calculation expression of frequency f osc is as follows ; = n ? 1 n (x n ? x) 2 n = 1 f osc (hz) [r t ] = , [c t ] = f 0.817 r t ? c t + 1.42 ? 10 ? 6 1
data sheet g12649ej5v0ds00 6 pc494 (2/2) block characteristics symbol conditions min. typ. note max. unit collector cut-off current i cer v ce = 40 v, v cc = 40 v, common emitter 100 a emitter cut-off current v cc = v c = 40 v, v e = 0 v, emitter follower ? 100 a common emitter v ce(sat) i c = 200 ma, v e = 0 v 0.95 1.3 v collector saturation voltage emitter follower v ce(on) i e = ? 200 ma, v c = 15 v 1.6 2.5 v output voltage rise time t r1 100 200 ns output voltage fall time common emitter t f1 v cc = 15 v, r l = 150 , i c 100 ma, t a = 25 c, see figure 1 . 70 200 ns output voltage rise time t r2 100 200 ns output section output voltage fall time emitter follower t f2 v c = 15 v, r l = 150 , i e 100 ma, t a = 25 c, see figure 1 . 70 200 ns standby current i cc(s.b) v cc = 15 v, all other pins open. 8 12.5 ma total device bias current i cc(bi) v (pin 4) = 2 v, see figure 1 . 10 ma note the typ. values are values at t a = 25 c, except for the characte ristics of temperature.
data sheet g12649ej5v0ds00 7 pc494 test circuit and waveform characteristics figure1. test circuit test input 12 k 50 k 0.01 f (4) c 1 e 1 c 2 e 2 ref out dead-time control feed-back r t c t non-inv. input inv. input non-inv. input inv. input output control v cc = 15 v r l 150 2 w r l 150 2 w output 1 output 2 v cc gnd note (3) (6) (5) (1) (2) (16) (15) (13) (7) (14) (12) (8) (9) (11) (10) note recommend film capacitor. caution when the emitter follower is output, connect c 1 and c 2 to v cc and e 1 and e 2 to gnd via r l . figure2. voltage waveform c 1 output voltage c 2 output voltage c t voltage sawtooth-wave oscillation output dead-time control input voltage feed-back input (e.a. output) 0.7 v threshold voltage 0% max. threshold voltage 0% v cc 0 v v cc 0 v connection of output control pin (pin 13) output control input (pin 13) operation mode ref out push-pull gnd single-ended operation (common-mode output of c1, c2)
data sheet g12649ej5v0ds00 8 pc494 typical performance characteristics (unless otherwise specified, t a = 25c, v cc = 15 v, reference) 1.2 1.0 0.8 0.6 0.4 0.2 0 25 50 75 t a - operating ambient temperature - c reference voltage vs. supply voltage v cc - supply voltage - v frequency vs. r t and c t r t - timing resistance - k 5 2 500 200 100 50 20 10 5 10 15 20 25 30 35 40 v ref - reference voltage - v f osc - frequency - khz 100 125 p t - total power dissipation - w 6 5 4 3 2 1 0 40 20 0 ?20 ?40 ?60 4 2 0 ?2 ?4 ?6 4 ?25 0 25 50 75 100 567 v cc - supply voltage - v frequency vs. operating ambient temperature ?25 0 25 50 75 100 miss-operation prevention circuit characteristics v ce - output voltage - v pc494gs, 494gs-a note 160 c/w 192 c/w thermal resistance r th(j-a) 125 c/w note with 5 cm x 5 cm x 1.6 mmt glass-epoxy substrate maximum power dissipation test circuit 5 v 430 v ce 8 9 6 5 4 3 2 1 0 500 200 100 50 20 10 5 2 1 v cc = 15 v i ref = 1 ma v cc = 15 v r t = 12 k c t = 0.01 f v cc = 15 v c t = 470 pf 1000 pf 0.01 f 0.047 f reference voltage vs. operating ambient temperature t a - operating ambient temperature - c v ref - reference voltage change - mv f/f osc - frequency change - % t a - operating ambient temperature - c pc494gt-a note pc494c
data sheet g12649ej5v0ds00 9 pc494 collector saturation voltage vs. output current i c , i e - output current - ma 0 40 80 120 160 200 v ce (sat) - collector saturation voltage (common emitter) - v v ce (on) - collector saturation voltage (emitter follower) - v 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 v ce (on) v ce (sat) standby and bias current vs. supply voltage v cc - supply voltage - v 10 20 30 40 12 10 8 6 4 2 0 i cc (s.b) v cc terminal biased. other terminal open. i cc (bi) v dtc = 2 v (pin 4) i cc (bi) i cc (s.b) i cc (s.b) - standby current - ma i cc (bi) - bias current - ma duty cycle vs. dead-time control input voltage v dtc - dead-time control input voltage - v 0123 duty cycle - % 120 100 80 60 40 20 0 1 10 100 1 k 10 k 100 k 1 m 10 m f - frequency - hz a v - open-loop voltage gain - db 0 10 20 30 40 50 85 c 25 c t a = ?20 c v cc = 15 v r t = 12 k c t = 0.01 f open-loop voltage gain vs. frequency
data sheet g12649ej5v0ds00 10 pc494 basic application circuit r sense gnd v out switching regulator output pin 100 r 14 r 15 r 13 v cc c 2 c 7 c 4 c 5 c 1 c 3 0.01 f c 6 47 f 100 7.5 k 3.9 k 7.5 k 110 240 k 2 k 5.1 k 5.1 k 5 k vr 3 ?i osense v osense 0.01 f jp 1 jp 2 r 1 r 5 r 2 r 8 24 k r 7 r 12 c 2 e 2 e 1 c 1 r 4 vr 1 r 17 r 3 5.1 k r 16 100 k r 6 24 k r 10 110 r 9 110 r 11 110 2 k + 10 f +5 v (v ref ) 16 15 14 13 12 11 10 9 12345678 +? error amp 2 error amp 1 reference regulator f/f oscillator 0.1 v 12 v + vr 2 +i osense + ? remark f osc 40 khz, c 5 = 1000 pf (recommend film capacitor)
data sheet g12649ej5v0ds00 11 pc494 connection diagram operation mode output control input (pin 13) output mode output voltage waveform sink (r 9 , r 10 short) c 1 c 2 push-pull ref out (pin 14) (jp1 wired) source (r 11 , r 12 short) e 1 e 2 sink (r 9 , r 10 short) c 1 , c 2 single-ended operation gnd (pin 7) (jp2 wired) source (r 11 , r 12 short) e 1 , e 2
data sheet g12649ej5v0ds00 12 pc494 typical example of application circuits 1) forward type + ? v out to ea ii (over current protection ) gnd +v cc +12 v v cc (12) (8) (9) (13) (14) (7) output control ref out gnd e 1 c 1 to ea i (v osense ) + 2) push-pull type v out + v cc c 2 e 2 e 1 c 1 gnd output control ref out v out ? gnd gnd v cc output control ref out c 1 e 2 c 2 e 1 (isolated) +v cc gnd +12 v to ea ii (12) (11) (9) (8) to ea i (10) (7) (13) (14) ? + (non isolated) +v cc to ea ii to ea i + + (40 v max.) (11) (9) (8) (10) (7) (13) (14) (12)
data sheet g12649ej5v0ds00 13 pc494 3) step-down chopper v out v cc output control gnd e 2 e 1 c 1 c 2 ? +v cc to ea ii (over current protection) to ea i + + (40 v max.) (11) (9) (8) (10) (7) (13) (12) remark the dotted line indicates the connection in case of large current. example of master-slave connection to synchronize pc494 ics, connect the pin 6 (r t ) of a slave ic to pin 14 (ref out) of the same ic, and connect both c t pins of master and slave ics after confi rming oscillator of slave ic is stopped. +v cc (m) v cc gnd ref out r t c t (s) v cc gnd ref out r t c t r t c t (m) : master (s) : slave (12) (5) (6) (7) (14) (12) (5) (6) (7) (14)
data sheet g12649ej5v0ds00 14 pc494 package drawings (unit : mm) pc494c item millimeters a b c f g h i j k 20.32 max. 2.54 (t.p.) 3.5 0.3 0.51 min. 4.31 max. 1.27 max. l 0.25 7.62 (t.p.) 5.08 max. 6.5 n 1.1 min. p 1.1 min. p16c-100-300b-2 d 0.50 0.10 m 0.25 + 0.10 ? 0.05 r0 15 notes each lead centerline is located within 0.25 mm of its true position (t.p.) at maximum material condition. item "k" to center of leads when formed parallel. 1. 2. m 1 8 16 9 b i j g h c n f d m r k p 16-pin plastic dip (7.62mm(300)) a l
data sheet g12649ej5v0ds00 15 pc494 pc494gt-a note each lead centerline is located within 0.12 mm of its true position (t.p.) at maximum material condition. a b n e detail of lead end k l p h g f i d 18 16 9 m s s c m j 16-pin plastic sop (9.53 mm (375)) item b c i a d e f g h j m millimeters 1.27 (t.p.) 0.805 max. 7.2 0.2 10.2 0.26 0.125 0.075 0.42 2.9 max. 10.3 0.3 2.50 0.2 + 0.08 ? 0.07 1.6 0.2 0.12 0.10 n k l 0.17 + 0.08 ? 0.07 0.8 0.2 p 3 + 7 ? 3 p16gt-50-375b-2
data sheet g12649ej5v0ds00 16 pc494 pc494gs, 494gs-a detail of lead end m 18 9 16 s s a b h k m l p j i g c e f n d item b c i 16-pin plastic sop (7.62 mm (300)) a d e f g h j p millimeters 1.27 (t.p.) 0.78 max. 5.6 0.2 10.2 0.2 0.1 0.1 0.42 1.65 0.15 7.7 0.3 1.55 + 0.08 ? 0.07 1.1 0.2 3 + 7 ? 3 note each lead centerline is located within 0.12 mm of its true position (t.p.) at maximum material condition. m l n 0.12 0.6 0.2 0.10 k 0.22 + 0.08 ? 0.07 p16gm-50-300b-6
data sheet g12649ej5v0ds00 17 pc494 recommended soldering conditions the pc494 should be soldered and mounted under the following recommended conditions. for soldering methods and conditions other than thos e recommended below, contact an nec electronics sales representative. for technical information, see the following website. semiconductor device mount manual (http: //www.necel.com/pkg/e n/mount/index.html) type of through-hole device pc494c: 16-pin plastic dip (7.62 mm (300)) process conditions symbol wave soldering (only to leads) solder temperature: 260 c or below, flow time: 10 seconds or less ws60-00 partial heating method pin temperature: 300 c or below, heat time: 3 seconds or less (per each side of the device) p300 caution for through-hole device, th e wave soldering process must be appl ied only to leads, and make sure that the package body do es not get jet soldered. type of surface mount device pc494gs: 16-pin plastic sop (7.62 mm (300)) process conditions symbol infrared ray reflow maximum temperature (package?s surface temperature): 235 c or below, time at maximum temperature: 10 seconds or less, time at temperature higher than 210 c: 30 seconds or less, preheating time at 100 to 160 c: 30 to 60 seconds, times: 3 times, flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. ir35-00-3 vapor phase soldering maximum temperature (package?s surface temperature): 215 c or below, reflow time: 25 to 40 seconds or less (at 200 c or higher), preheating time at 120 to 150 c: 30 to 60 seconds, times: 3 times, flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. vp15-00-3 wave soldering solder temperature: 260 c or below, flow time: 10 seconds or less, maximum number of flow processes: 1 time, preheating temperature: 120 c max. (package surface temperature). ws60-00-1 partial heating method pin temperature: 350c or below, heat time: 3 seconds or less (per each side of the device), flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. p350 caution apply only one kind of solder ing condition to a devi ce, except for "partial heating method", or the device will be damaged by heat stress.
data sheet g12649ej5v0ds00 18 pc494 pc494gt-a note1 : 16-pin plastic sop (9.53 mm (375)) process conditions symbol infrared ray reflow maximum temperature (package?s surface temperature): 260 c or below, time at maximum temperature: 10 seconds or less, time at temperature higher than 220 c: 60 seconds or less, preheating time at 160 to 180 c: 60 to 120 seconds, times: 3 times, exposure limit: 7 days note2 (after that, prebake at 125 c for 20 hours), flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. ir60-207-3 wave soldering solder temperature: 260 c or below, flow time: 10 seconds or less, maximum number of flow processes: 1 time, preheating temperature: 120 c max. (package surface temperature), exposure limit: 7 days note2 (after that, prebake at 125 c for 20 hours). ws60-207-1 partial heating method pin temperature: 350c or below, heat time: 3 seconds or less (per each side of the device), flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. p350 notes 1. pb-free (this product does not contain pb in the external electrode and other parts.) 2. after opening the dry pack, store it a 25 c or less and 65% rh or less for the allowable storage period. pc494gs-a note : 16-pin plastic sop (7.62 mm (300)) process conditions symbol infrared ray reflow maximum temperature (package?s surface temperature): 260 c or below, time at maximum temperature: 10 seconds or less, time at temperature higher than 220 c: 60 seconds or less, preheating time at 160 to 180 c: 60 to 120 seconds, times: 3 times, flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. ir60-00-3 wave soldering solder temperature: 260 c or below, flow time: 10 seconds or less, maximum number of flow processes: 1 time, preheating temperature: 120 c max. (package surface temperature). ws60-00-1 partial heating method pin temperature: 350c or below, heat time: 3 seconds or less (per each side of the device), flux: rosin flux with low chlori ne (0.2 wt% or below) recommended. p350 note pb-free (this product does not contain pb in the external electrode and other parts.) caution apply only one kind of solder ing condition to a devi ce, except for "partial heating method", or the device will be damaged by heat stress.
pc494 the information in this document is current as of august, 2008. the information is subject to change without notice. for actual design-in, refer to the latest publications of nec electronics data sheets or data books, etc., for the most up-to-date specifications of nec electronics products. not all products and/or types are available in every country. please check with an nec electronics sales representative for availability and additional information. no part of this document may be copied or reproduced in any form or by any means without the prior written consent of nec electronics. nec electronics assumes no responsibility for any errors that may appear in this document. nec electronics does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of nec electronics products listed in this document or any other liability arising from the use of such products. no license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of nec electronics or others. descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. the incorporation of these circuits, software and information in the design of a customer's equipment shall be done under the full responsibility of the customer. nec electronics assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. while nec electronics endeavors to enhance the quality, reliability and safety of nec electronics products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. to minimize risks of damage to property or injury (including death) to persons arising from defects in nec electronics products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment and anti-failure features. nec electronics products are classified into the following three quality grades: "standard", "special" and "specific". the "specific" quality grade applies only to nec electronics products developed based on a customer- designated "quality assurance program" for a specific application. the recommended applications of an nec electronics product depend on its quality grade, as indicated below. customers must check the quality grade of each nec electronics product before using it in a particular application. the quality grade of nec electronics products is "standard" unless otherwise expressly specified in nec electronics data sheets or data books, etc. if customers wish to use nec electronics products in applications not intended by nec electronics, they must contact an nec electronics sales representative in advance to determine nec electronics' willingness to support a given application. (note) ? ? ? ? ? ? m8e 02. 11-1 (1) (2) "nec electronics" as used in this statement means nec electronics corporation and also includes its majority-owned subsidiaries. "nec electronics products" means any product developed or manufactured by or for nec electronics (as defined above). computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots. transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support). aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. "standard": "special": "specific":

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	To Download UPC494GS-E1-A Datasheet File
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