TL494CD

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TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS 02535, JANUARY 1983-REVISED OCTOBER 1988 © Complete PWM Power Controi Circuitry TL493C . .. 0 OR N PACKAGE © Uncommitted Outputs for 200-mA Sink or ennon (ror view! cunnenr Source Current {nowy eur Ef Ore oniny nour AMP inv iNpUTC}2 so is[JINV INPUT LIMIT AMP: ‘© Output Control Selects Single-Ended or FEEDBACKE}> — se[JREF OUT Push-Pull Operation DEAD-TIME CONTROLE]« — 3[JOUTPUT CONTROL crf}ss2f]vec © Internal Circuitry Prohibits Double Pulse at Rifje fice Either Output no? = of Jez citfs__afer © Variable Dead-Time Provides Control over Total Range ‘TL4941, TL494C . . . D, J, OR N PACKAGE 2 ‘© Internal Regulator Provides a Stable 5-V (ror VIEW Reference Supply, 5% samaynouny inourEfr Tra] noniny aes ee AMP inv inert} vsplinvineur AMP? 2 © Circuit Architecture Allows Easy FEEDBACK[]s raf] REF OUT o Synchronization DEAD-TIME CONTROLE]s —13PJoUTPUT CONTROL 3 erf]sap1vec © L493 has Output Current-Limit Sensing Arte saphor a onof]? —sofle2 © TL495 has On-Chip 39-V Zener and External ccitla_‘sPles g Control of Output Steering s . TL495C . . . N PACKAGE od description crop views The TL493, TL494, and TL495 each incorporate ganar {non inpuT (ft Orep}noniny input U ERROR on a single monolithic chip all the functions AMP INV INPUT} Dinv input AMP 2 required in the construction of a pulse-width- peao Time conrroc dd Ave. our Ise-w z modulation control circuit. Designed primarily for ed Hourrur controt power supply control, these devices offer the ard Hsreerina Input systems engineer the flexibility to tailor the ono DYcc power supply control circuitry to his application. a pez el lez The TL493 contains an error amplifier, current- limiting amplifier, an on-chip adjustable DEVICE TYPES, SUFFIX VERSIONS, AND PACKAGES oscillator, a dead-time control comparator, pulse- steering control flip-flop, a 5-volt, 5%-precision [| mass [ ruaoe T russs | regulator, and output-control circuits. a Tac Din The error amplifier exhibits a common-mode voltage range from — 0.3 volts to Ve — 2 volts. “These combinations are not defined by this data sheet. The current-limit amplifier exhibits a common- mode voltage range from —0.3 volts to 3 volts FUNCTION TABLE with an offset voltage of approximately 80 {[weurs, sd millivolts in series with the inverting input to ease STEERING circuit design requirements. The dead-time OuTPuT INPUT control comparator has a fixed offset that — |CONTROL| (71495 oniy) provides approximately 5% dead time when v=o ‘Open Single-ended or parallel output externally altered. The on-chip oscillator may be Vi = Veet Open Normal push-pull operation bypassed by terminating RT (pin 6) to the v=Ve] v=o PWM Output a¢ 01 reference output and providing a sawtooth input Mi= Vet] Vi = Veer PWM Output at 02 to Cr (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. Ee PRODUCTION DATA documents consi information Copyign © 1963, Texes Inevumente Incorporated {urram e of peblicaton deta: Products cofarm to ‘erections par the tarms of Texas Instruments TEXAS bd SSSy Tae ie eee INSTRUMENTS 2128 POST OFPCE 80x 686012 » OALLAS, TEXAS 76265

TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS —— SSS description (continued) The uncommited output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be selected through the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation. The TL493 and TL494 are similar except that an additional error amplifier is included in the TL494 instead of a current-limiting amplifier. The TL495 provides the identical functions found in the TL494. In addition, it contains an on-chip 39-volt diode for high-voltage applications where VCC is greater than 40 volts, and an output-steering control that overrides the internal control of the pulse-steering flip-flop. 2 The TL4941 is characterized for operation from -25°C to 85°C. The TL493C, TL494C, and TL495C are characterized for operation from O°C to 70°C. © functional block diagram S ba Sheena impor) Gururcowmon? o | Steeawe mmr] 1 “ourrur common | g | ge eee ae | | Wee FONE ON Tat 2 t i 1 oy cr wap -°1¥[ > T+ . TOR APLFIEA 4 i tT) > NONINVERTING PWM "2 poi [> Zouanaror twverrna cl NoMMvERTING H H vee Nur weet | ae weuT f I Recutaton var Lees ane Tses i] CORRENT-imir Noninvenring_!_ AMPUFIER KD ‘eno vera | ony | >> if 07 mal f venting Tpo7 mal y; wnpuT 1 1% gs ony _! L__nsssomy | reeopack 2-124 TEXAS nd INSTRUMENTS

TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS ees absolute maximum ratings over operating free-air temperature range (unless otherwise noted) we | oe | masac [Supply voltage, Vcc isee Note) a a a [Ampitior input votage i Ver 03 | Veg v0.3 | vecvos |v] | Collector output vonage a a a | Collector output current 80 280250 mA | [immenstrsowcou von | m0 [awe [aw |e | from case for 60 seconds: J packege Lead temperature 1,6 mm (1/16 inch) [20 | [timentrtowore ornmmage |_| 2 NOTE 1: All voltage values, except differential voltages, are with respect to the network ground terminal. $ DISSIPATION RATING TABLE an vackace A= 25°C DERATING DEHATE Ta = 70° ‘ta = 88° s POWER RATING FACTOR ABOVE Ta POWER RATING POWER RATING 8 D 900 7.6 mwreG 25°C 608 mW 494 mW J 1000 e2mwec 28°C 656 mW 533 mw N 3000 9.2mwirc _419¢ 736 mW 598 mW recommended operating conditions Tia93c masa tuasac muas¢ nO SO [Supply voltage, Veg ETO | Colector output voltage, Vo OTT | Collector output current (each wansisto) | 80 | 20 | mA [ Current into feedback terminal 0. [0 ma | [Timing capacitor, Gp C047 O00 [47 TO.000 | nF _| | Timing resistor, Ape 00 [ne s00 Te _ | | Oscivaror frequency 800 [800 |r| Operating free-air temperature, TA [ =25 es | oo Tec] TOE Texas WY 2125 INSTRUMENTS

TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS EE electrical characteristics over recommended operating free-air temperature range, Vec = 15 V. f = 10 kHz (unless otherwise noted) reference section [Ouputvonese Ven mA CC“‘“i CB TV Lisp regulation ce eee | 2 [oupat regulation [tos tt tOma ‘Output vollage chenge = MIN to with temperature. ata to MAX [ Shom-cveat output corents| Va | © oscillator section (see Figure 1) Fy oO 9 [min tyP® Max | Es er a ee occ [ Frequency change wih vorage [veg = 7 vw @0V. tas zee | ome — Cro Ole, Ar = 12, Frequency change with temperature# Sr anes Max amplifier sections (see Figure 2) ["__PanamereR —*[ ————svestconommions MN Tv Max | unr | Inout offset voltage Current] Vo (nin 3) = 2.5.V mv L493 oniy) EE [input bies current ———*+dtVowina=25v CT A common-mode input . Voo=2 v voltage range. ‘Current limit. Vec = 7V to 40v (L499 ony) [Error | Oven ion vote Canon] AVo = 3V, RL = 2k2 Vo = 0S V103.5¥ ia (TL493 only) | Unity-gain bandwidth Vg HOS V0 S5V RL = 2kO [800 ee | commonmade [em Common-mod Cunentiini'] aVo = 40V, Ta = 25°C 70 elect (TL493 onty) [ouput sink curent pas) | ip = 18 mV tO SV Vgingy = O7V | oa 07 [ma | Ven isnve sv. Ving 35V f=?‘ ma t For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. {ll typical values except for poremeter chenges with temperature are at Ta = 25°C i § Duration of the short-circuit should not exceed one second. E ixq — 12 {Stondord dovieton i» measure of the steusticaldistnbution about the mesn as derived from the formula g =\\ / 9 = "1 VFetngoranore cootacten of timing capecitor and timing resistor not taken into account waa TEXAS a 2-126 INSTRUMENTS post OFFICE BOX 655012 + DALLAS, TEXAS 78288

TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS RUST Nn EBT =ppeyerarr spe neeeeenT EE ny electrical characteristics over recommended operating free-air temperature range, VCC = 15 V, f = 10 kHz (unless otherwise noted) output section oa _—_ ca | Min “TyPT MAX | | Coltector oftarate curent | __vge = 40V. Veg = 40] 2 100] a] | Emitter offstete eurent [Veg = Ve = 40V. ve=O | S100 | rv] Collector-emiter [Common-emitter| Ve =O. ic = 200mA | | urn ona Enrttoner| ——ve= seve a, 3 | Y 2 [Output control input current [= Vet Si Ym a dead-time control-section (see Figure 1) o [__Paraweren [| rest.conpmions Nv wax ower] [Teeur bios curentipin a) [p= ow sav of a] [ Maximum duty eyele, each output |" Vitein4) = 0.Cr = OTF A= tema | am «dS © [ememems | ee et |g a pwm comparator section (see Figure 1) [___Panameren [TST coNDmions—— «MIN TyPT_wax | UNIT | | input threshold voltage pin 3) [ero duty eyele CYST Vd [isput sink eurent tpin 3) Vipin) = O7V Cd Smad ‘steering contro! (TL495 only) [panameren [tes coNommONS Sd INA | UNIT | [Ts og 200 J eee “ zener-diode circuit (TL495 only) [___Parameren [esr conpmows [mn tve? max | unit | | Breakdown voltage vec atv. z= 2ma TCT [Sink current Vipin gy = 0. total device [ _Parameren [test conpmions ST MIN TYP? MAX | UNIT | ‘Standby supph Pin 6 at Viet. 610 endby supply current All other inputs and outputs open 915 [Averoae supply current Vipinay = 2¥, Sen Figo [Cm switching characteristics, Ta = 25°C [___Paramerer [Testconpmons [MN vP?_Max | UNIT | Commor-emitter configuration, [100 300[ ns —] See Figure 3 [28 100 [ns] Emitter follower configuration, [100200 | “ns | See Figure 4 es ‘All typical values except for temperature coefficient are at Ta = 25°C.

1 Texas nd 2127

INSTRUMENTS, POST OFFICE BOX 655012 + DALLAS, TEXAS 75265

14 THRESHOLD VOLTAGE ~~

FIGURE 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS

5 UNDER TEST

FIGURE 2. AMPLIFIER CHARACTERISTICS 2 FIGURE 3. COMMON-EMITTER CONFIGURATION

M TL493, TL494, TL495 PULSE-WIDTH-MODULATION CONTROL CIRCUITS —_—SSSSSSSSSSSeFFFSSFSSFSS TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY AND FREQUENCY VARIATIONt vs TIMING RESISTANCE 100 k eyo SiS Vi ee ES Ean ft ee Se ore CNRS FA & 400 FSS 3 on oe Ratt = et

3 SSS ace eee

3 Seiten Seat

vr rning Ressance.0 FIGURE 5 AMPLIFIER VOLTAGE AMPLIFICATION FREQUENCY 100 90 mS aVo = 3V NI Ta = 25°C 3 =a is Kr per Fa en So Nee rN ° 1 10 100 1k Wk 1M FIGURE 6 ‘Frequency variation (af) is the change in oscillator frequency that occurs over the full temperature range. a TEXAS we 2-130 INSTRUMENTS