3572AM BURR-BROWN | Alldatasheet
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BURR-BROWN® 3571 R ep 3572 | & nt . 1 2 High Current — High Power OPERATIONAL AMPLIFIERS o ti FEATURES Z © HIGH CURRENT © SELF-PROTECTED z Up to SA Peak, 2A Continuous Self-Contained Automatic Thermal S + EASY TO USE Sensing and Shutdown < ‘Adjustable Current Limits HIGH POWER a Electrically Isolated Case Delivers up to 7OW to Load < ‘Smail Size — &-Pin TO-3 Package z ¢ HIGH VOLTAGE o Up to 70V p-p Output E a } °o ‘International Airport industrial Park - P.O. Bex 11400 - Tucsen, Arizona 85734 - Tel, (602) 746-1111 - Twx: 910-062-1111 - Cable: BORCOAP - Telex: 66-840! Posse Burr-Brown IC Data Book 2-237 Vol. 33
DESCRIPTION
The 3571AM and 3572AM are high output current —_fiers useful for many different types of loads. integrated circuit operational amplifiers. Their Pet The output circuit has a unique protection feature which formance, ease of use and compact size make them ideal thas notes . 4 ase oat hich carat applications, They are 8 Practical only in integrated circuit amplifies - self- ee ees eter civing permanent magnet DC contained automatic thermal-sensing and shutoff cir- especially well suited for driving pe! ts cuitry which automatically turns the amplifier off when servo and torque motors. : 5 mot the internal temperature reaches approximately 150°C. The equivalent circuit for the 3571AM and 3572AM is This is accomplished by sensing the substrate temperature shown in Figure 1. The design uses a monolithic FET and deactivating the amplifiers biasing network when the input stage for high input impedance. low bias current. temperature reaches 150°C. As this happens. the output | and low voltage drift versus temperature. The high input load current limits at a safe value and the amplifier’s | impedance provides negligible source impedance loading quiescent current decreases. The output current may errors when the noninverting circuit configuration is remain at a low value or oscillate between two values used. The low bias currents minimize offset errors when —_gepending on the amount of power being dissipated and large values of source and feedback resistors are used. the heat sink conditions seen by the amplifier. In either The input offset voltage at 25°C and the input offset case. the amplifier will not sustain internal damage and voltage drift versus temperature are compensated by _will return to normal operation withina few seconds after state-of-the-art laser trimming techniques. The offset the abnormal load condition is removed. voltage is low enough so that trimming will not be {nternal thermal protection removes some of the con- required in most applications. The excellent input char- straints of power derating for abnormal operating condi- acteristics and the high gain available mean that the usé tons, The amplifier will protect itself for many cortditions of a preamplifier. sometimes required with other servo of excess power dissipation (see Power Derating Curve). type amplifiers. will not be necessary with the 3571AM_——This allows the use of a smaller heat sink to protect and 3572AM. against abnormal output conditions since the amplifier The output stage isa class AB design which provides low —_has its own internal protection for many conditions of distortion and minimizes quiescent current drain. The excess power dissipation. The output constraints of the output circuitry provides for external current limiting Safe Operating Area Curves must still be observed. resistors for both positive and negative output currents. The 3571 AM and 3572AM have several other features Thisallows the user to select the current limit value suited that improve their utility, For instance, the metal case of to his particular application, This is especially desirable the units is completely electrically isolated. (This can be for driving permanent magnet motors where the high contrasted to most power semiconductors where the case current seen during direction reversal (plugging) can —_ig connected to the collector of the device.) This simplifies demagnetize the motor. mounting and reduces cost because the need for insulating The 3571 AM and 3572AM have been designed tooperate spacers and bushings is eliminated. The hermetically overa relatively wide supply range(tISVDC tox40VDC) —_ sealed package improves reliability and will withstand while still maintaining the high output current capability. _ severe environments better than discrete component This allows the user a wide range for the selection of the amplifiers. The small package size makes mounting more proper output voltage and current and makes the ampli- convenient. C_] a Ul @-y"tee a fi i rh He » Fa =. © came. FIGURE I. Equivalent Circuit Burr-Brown IC Data Book 2-238 Vol. 33
‘Typical at Toase = 28°C and +Vcc = +35VDC max unless otherwise noted. a [rarepoureut fom Tus MECHANICAL 8 ‘Continuous, mint) 20w ow * b3 Peak mira) ow 150W : he Output Vottage, +(IVec!-5)¥ . © Continuous, mia seovetsia | s30vat324 — Peak, mint?) $90V at 2A £30A at SA I__+ Load Capacitance, min. Cc = 0 3300p Ce= 1000pF ud Seaing Pane . i ‘At 25°C Case Temperature 7 ow Derating Above 25°C See Typical Performance Curves ° 2 ‘Thermal Resietance, Cate to Free Air arc . ‘Thermal Time Constant (0 heat snk) 2 minutes ° 2 Thermal Resistance, Junction to Case 25°C ° cl [Powenquenty ao Voltage, $cc TIBVDO w 24VDC “ Bs ia Quiescent Current, max +35mA, © @ ® wi Goin min, at Picea = S00 (SS72AMT & Picea = 600 (3571AM) nove 3 Output Impedance Leads in true posivon within 0.010" a [ FREQUENCY RESPONSE em at sexing are s Unity Gain Bangwioth, Small Signal Sooner Pn unten shown io mterece oly Full Power Bandwisth 10x at Vok = 30 Manors my ratte mete on pecans < Slow Rate, Co = 1000p Swinsec [—cnes [mummers] | [meu orFseT vou rage [oom ae an =z Initial at 25°C, max t2mV [a [sie [eso | se38 [30.37 | z Drift vs. Temp., max 240nVC [oY ras [770 [es2 Tess | fo} rit v. Suppty Voltage S100, (e—[ see [a00[ 70a [ree | 9S Dri vs. Time 50uV/mo [o [ese [ou [oor [sr] E Drift vs. Power Dissipation (Tc constant) 20uv/W [eT ceo [10 [203 [267 | < [ eeeur eras cunnent pe—pssreasie fast nase [aT sooeasic |" 127 easic —} c \\nitat at 25°C, rma “100pA [= [ites sasic [3017 0asic | Ww Drift vs, Temp. doubles every 10°C ee ae a Dri va. Supply Voltage O.5pAN [x [soo soe [Prove | 1238] [weur OfrseT CURRENT es Ae EC ET ° ‘ital at 25°C Topa [xT one Tao [aene [25.91] Dri va. Temp, doubles avery 10°C rit ve. Supply Votiage OSpAN [pur napepance CONNECTION DIAGRAM Ditferential TO" | 105 ‘TOP view Common-mode worn i [md Voltage 0.01HE 10 TORE, pp +sc 10H to tke, vee (3 C2) Current 0.01Hz to 10H. pp G) oureur 10Hz to thea, rms xO Max Safe Differential Voltage (+Vec +! Voc!) Max Sate Commen-mode Voltage “Wee to Vee Common-mode Vottage, Linear Operation £11Vee! 10 ws) Common-mode Reject to min, 9058 yp @) se [ TEMPERATURE RANGE (Caso) Bectcaton Cea wo) Operating 55°C 10 HAC Storage “58°C 1041266 FREQ. SCe cou nore: 1. Sale Operating Area and Power Derating imitation must be observed. we The cases electrically isolated tis recommended thatthe case be grounded during use, “A-10009F 320% ceramic capacitor fs recommended for alleitcul configurations ang at all ampilier gains. The capacitor’ lead langths should be short For gains above 10V/V, Cc is not absolutely required buts recommended Burr-Brown IC Data Book 2-239 Vol. 33
“ype Teme = 25°C and *Vec = +38VDC unless otherwise noted POWER DERATING 3872 SAFE OPERATING AREA 3871 SAFE OPERATING AREA 60 r 6 2 FA | Y x Lays 2 3.” Pratecton W/ a tS an zo 4 de ) V) : Goieg 3 E sof. asrt ana 7 = ob Fam Tease a al ae ee NGL, S| corsa ss 8 o5 2E 2}—+ += 7, Fae Makar WW 2°T 7 (7 A 3 ne -asom = Y & *Geoa 34 7 a 10 —— 4 © -3F shutdown ° it | 2 T LY val may occur Z| 15} —-+— 5 y 3 Li) a A 02s 30 78TH 125150 SSO oI 20 ‘3020 100102030 Case Temperature Te °C Output Votage V output Votage V ourrut vourace VOLTAGE FOLLOWER VS FREQUENCY PULSE RESPONSE DISTORTION VS FREQUENCY “50 “5 s eof ff 250 - shoe — e PES Moone i I > Ce = 1000pF Rec 0750 > 2st 4 100008 F - Wwe Pik ery 3: 5 | Ce = 09 Be 6 5 — — y< 0 as 0 — {oo Toe TORT TOM oS S80 eNO Tk 10x 100K TM Frequency He Te use Frequency Ht OPEN-LOOP GAIN OPEN-LOOP GAIN VS FREQUENCY OPEN-LOOP PHASE VS SUPPLY VOLTAGE 120 9 1 rot ao 103 woh + Not 1. g © $ % ool ++ ITE 2 x it § of + 1 a Ce =0pF Sol tot 3 8 | } B (Gc = 1000p 2% ry B < Y0009 2 ar ee . aa cope Bf Lee Ge ~ 1006F a & | 20! J gal yoo ona Sao Tao Te TOR TORT TOM 1S 20880 Frequency. Mz Freavency He Supply Voltage, Vee ¥ CURRENT LIMIT VOLTAGE QUIESCENT CURRENT COMMON-MODE REJECTION VS TEMPERATURE VS SUPPLY VOLTAGE VS FREQUENCY 20 109 110 ve rTTTT] 3.t yt Ey Ty : +80 g 10S 2S PTET PNET Z> g 760) _ = 8 EG 10) =< S ¢ 28 ™—~ Bs 1 g E a “eT = a 5 —+— z 6 98 a 2 ol 3 5 : ? CI s,L | | | M25 0225 7507S F100 7128 See ee Sa) 3500 10700 Teton T00R TM ase Temperature To °C Power Supoly Voltage, 2Vce °V Frequency He Burr-Brown IC Data Book 2-240 Vol. 33
The 3571 AM and 3572AM require a minimum heat sink be noninductive, Do not use wire wound resistors. described in the Thermal Considerations section which circuit, could permanently damage the internal 750. igniicant grOunding-l0op Pe limiting the internal power dissipation of the amplifier. FIGURE 2. Proper Power Supply Connections. function of the output voltage with the load resistance as resistors are given by the following equations: Voltage.
Pw, for any other value of Vou can be computed from Safe Operating Area There are additional constraints of the output voltage Pan = (Vcc = #V nad «he = (#Vce = tVou) (= and current other than those just due to the maximum Ri internal power dissipation of the amplifiers. These are related to the prevention of secondary breakdown in the The use of an adequate heat sink is mandatory and _UtPut stage transistors. These restrictions are shown in thermal resistance of the heat sink (@),)can be determined _ the Safe Operating Area Curves in the Typical Perform- from the equation: “ ance Curves. Oy. = (Ts TP) = By Application Constraint Because of the possibility of damaging the output stage if where Ty is the desired amplifier junction temperature frequency instability (oscillations) occurs, applications (4150°C. max). T, is the ambient temperature. Pr isthe with an inductive load which will activate the current | amplifiers dissipation. Pp = Poo + Pi. and 8 is the limit of the amplifier. are limited to a load impedance ! junction to case thermal resistance of the amplifier. Burr- phase angle of less than 60°C leading. over the frequency Brown Application Note AN-83entitled. "Howto Deter- _ band of 10kHz to 100kHy. Increasing the load’s series mine What Heat Sink to Use". is available for additional _resistance will decrease the angle, if necessary. Larger information. inductive loads may be applied if current limit is not The electrically isolated case of the 3571AM and 3572AM activated. simplifies mounting the amplifiers to the heat sink (and Frequency Compensation the heat sink to any other assemblies) since there is no The optimum value of the compensation capacitor is need for electrical insulation. Thermal joint compound —_1000pF. A +206; tolerance ceramic capacitor is recom: and lock washers should be used to prevent mechanical mended. The compensation capacitor should be used relaxation due to thermal stresses. with all circuit configurations and at all amplifier gains {see note on Connection Diagram). TYPICAL APPLICATIONS ‘TACHOMETER FEEDBACK el] CURRENT FEEDBACK * Ce 7 a; g Sh of) + y
4 Q> On o
‘im aA 4 KT 7 ° Ke | ©) ee moron & Dre vioaners ~ ~ () wll, mk 's + POWER ee ee V SIGNAL GROUND ‘GROUND ‘VOLTAGE FEEDBACK PROGRAMMABLE POWER SOURCE k ® 4 g q ww o) ar : in, ] Your On. a © Z © C) tom Rese - Vet — “ce ot = yy 82 “ Tt % Vin i Burr-Brown IC Data Book 2-242 Vol. 33