The document describes B50A series power amplifiers for driving brushless DC motors. It provides specifications for two models, the B50A8 and B50A20, including voltage and current ratings, switching frequency, inputs/outputs, and mechanical details. The amplifiers feature surface mount technology, small size, low cost, and optional signal isolation. They are fully protected against over-voltage, over-current, and short circuits.

1. B50A Series
B5OAS ERIESP WMS ERVOA MPLIFIERS
MODELS: 850A8, 850A20
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FEATURES:
* Surface-moutnetc hnology
' Smalls ize,l owc ost,
ease of use
. Optionailn puts ignal
isolation{o r off{ he-rectiife d
120 VAC line operation
. DIPs witchs electable:
currentv, elocity,
open loop conlrol
* Fourq uadranrte generativoep eration
DESCR|pTIONB: 50AS eriesP WMs ervoa mplifieras re designedto driveb rushlessD C motorsa t a highs witching
frequencyO. peratinegl ficienciys 97"k.A IIm odelsa ref ullyp rotecteadg ainsot ver-voltagoev, er-currenotv, er-heatinagn d
short-circuitAs.l l modelsin terfacwe ithd igitacl ontrollerosr can be useda s a sland-alonsey stem.T heyr equireo nlya n
unregutatesdi ngtep owers upply. Loop gain, currentl imit, inputg ain and offsetc an be adiustedu sing 15{urn
potentiometerTsh. eo flseta diustinpgo tentiometcear na lsob eu seda sa no n-boaridn puts ignaflo rt estingp urposesw,h en
SWl0 (DlPs witchi)s "On".
cuRREriT REFERENCE <,, I
l'lAxll'lul'Ct URREfl=T 7.5U * '
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FUdCTIOIIAL BLOCK NIA6PAI'I
LINE REPRESENTS OPTIONAL 75()U ISOLATIO{ (ISO)
norE- aLL * cnouros AREI XTERIIr{-LYco rlNEcrE!.
IF IsoLAnoil oprlor! rs sELEcreD + AflD= 5 6R0uNDsn REi loT co{'lEcrED, IdTERHaLP 0,|ERS UPPLY
ALL P1 COIIIIECTOR PII1S AR€ ISOLATE! FROI1 ALL OTHER PIIJS. FOR HA-L
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LED GREEI'{ - NORNAL OPERATION, LED RED - FAULT
RECOHTENDEDSE TTIXG FOR CURRETiTI 'IODE- FOTI FULLY CC!I, POT3 FULLY C!
SI1 - FUT{CTIOTOt F POT 1 - TEST IIJFUT, IIIIEH ON. OFFSET AD..!.JSTI'IEiITI,I HEII OFF
S!I2 - LOII UELOCI]Y RANGE. t.IHEIi ON (USED III UELOCITY I'IODE OtiLY)
Sl,l3 - lU-€A, l4€l 011, lU-{A, llHEtl oFF
st10 - 1a) IIEGREE PHFS$i6, llHEn ofl, 60 DEGREE PHASttlG. LlHEd oFF
su9
CUPPENT NOiE NN xa ON
ox
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rR c0rlPENSAll0ti N ' NN OFF
IA.HniFTFP inTF I NFF NC OFF
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2. B50A Series
MODELS
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
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sales@electromate.com
POWER STAGE SPECIFICATIONS B5OA8 850A20
SUPPLY VOLTAGE 20-80v 30-200v
MAXIMUMPE AKC URRENT 150A +50A
MAXIMUMC ONTINUOUCSU RRENT +25A +254
MINIMUM LOAD INDUCTANCE 1 50uH 250uH
SWITCHINGF REQUENCY 33 KHZ
THERMAL REOUIREMENTS:
Case Temperature
-25"Ct o +65oCc, urrenlr educedif over+ 65oC
OUTPUT SPECIFICATIONS
POWER SUPPLIES. +10V P1- 1
5mA, short circuit protected
-10v P1- 3
+5V P2- 1 30mA,s hortc ircuitD rotected
CURRENTR EFERENCE: P2-9 Maximumcu rren=t 7.5V
CURRENTM ONITOR: P2-8 1V=8Aw hen SW3=ON,1 V=4Aw hen SW3=OFF
VELOCITYM ONITOR: P1-10 10 kOhm
INPUT SPECIFICATIONS
HALLS ENSORS: P2-3 .4.5 TTL,i nternapl ull-upre sistors
iNFtstt: p1-6 TTL,i nternapl ull-upre sistorp,u llt o grounctoj inhibit
amplifier
TACHOMETER: P2- 6 Maximum16 0Va nalog6, 0Ki nputr esistance
INPUT: P1- 4,5 Differentianl alogin put,m aximum+ 10V,5 0Ki nput
resistance
MECHANICAL SPECIFICATIONS
POWERC ONNECTOR Screwt erminal
SIGNALC ONNECTOR Phoenixo r molexc onnector
SIZE (inches) 5.06x10.00x1.70
WEIGHT 2.5 lb
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3. B50A Series
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Sold & Serviced By:
ELECTROMATE
Toll Free Phone (877) SERVO98
Toll Free Fax (877) SERV099
www.electromate.com
sales@electromate.com