Agamem Microelectronics Inc.

Transcription

1 OVRVIW Th is a BJT intgratd circuit using in srvo motor control applications. Th uilt-in voltag rgulator provids th with xtrmly stal output voltag. It also incorporats a linar on-shot and puls-width dmodulator for improvd positional accuracy. FATURS Built-in voltag rgulator. argr driving capaility. Intrnal output NPN powr transistor. Adjustal dad and rang control. Incorporats a protction circuit for "H-Bridg" driving configuration. Small outlin packag. PIN onfiguration (TOP VIW) (TOP VIW) (TOP VIW) R T 1 16 T R T 1 16 T XP R T XP POT XP POT V IN 2 13 T OUT V IN OUT V IN OUT N GN 4 13 N GN 4 13 GN GN 4 11 POT OUT GN OUT GN R B 5 10 V XP R B XP R B OUT2 6 9 V RG ST 7 10 V ST 7 10 V ST 7 8 XP2 N 8 9 V RG AP (TSSOP 16) APPIATIONS N 8 9 V RG P (SSOP 16) FP (SSOP 16 F) PP (IP 14) Srvo motor control. Radio controlld car, oat, airplan. IA products (such as air-condition). Rmot positioning. opyright 1

2 PIN SRIPTIONS P FP Pin No AP PP Symol I/O Nam & Function RT Timing Rsistor XP1 O xtrnal PNP Transistor 1 output OUT1 O Output rivr OUT2 O Output rivr XP2 O xtrnal PNP Transistor 2 output ST Strtchr capacitor 8 8, N No onnction VRG O Rgulatd Voltag output V Powr supply pin RB rror puls output 4,12,13 4,12 4 GN Ground pin VIN I Input signal POT I Srvo position voltag T Timing apacitor BOK IAGRAM V 10 2 XP1 VIN 14 irctional ogic ontrol PWM ontrol Output rivr 3 5 OUT1 OUT2 6 XP2 Sawtooth Wav & On Shot Gnrator Srvo Position & Ovr-Tim ogic Puls Strtchr Voltag Rgulator 9 VRG RT T POT RB ST GN GN GN Not: Pin no. is for P/FP, plas rfr to PIN SRIPTION for othr packag typ. opyright 2

3 TRIA HARATRISTIS ABSOUT MAXIMUM RATINGS (Ta=25, unlss othrwis notd) Symol Paramtr onditions Ratings Unit Vcc Supply voltag 7 V Pd Powr dissipation 300 mw Tstg Storag tmpratur rang 25~125 GNRA HARATRISTIS (Ta=25 and Vcc=4.8V, unlss othrwis notd) imits Symol Paramtr Tst conditions Unit Min. Typ. Max. I Whn output is OFF 5 8 ma Oprating currnt Whn output is ON ma V O Output voltag "" oad rsistor 20Ω V V OH Output voltag "H" oad rsistor 240Ω 3.5 V I PNP xtrnal PNP transistor driv currnt oad rsistor 240Ω 30 ma V RG Rgulator output voltag oad capacitor 0.1uF V I RG Rgulator output currnt oad rsistor 500Ω 4 ma FUNTIONA SRIPTION (1) Voltag Rgulator This circuit is composd of a and gap circuit, and outputs a 2.45-volt tmpratur compnsatd rfrnc voltag. This rfrnc voltag is stailizd whn th supply voltag is varial. (2) Sawtooth wav & On-Shot Gnrator onnct a capacitor to T pin will gnrat a triangular wav y constant currnt charging. A typical valu is 0.1uF. Th constant currnt is dtrmind y a rsistor connctd to RT pin. A typical capacitor of approximatly 0.1uF should connctd in paralll with th rsistor to incras staility. (3) Srvo Position & Ovr-Tim logic This circuitry consists of a puls width comparator, which compars th srvo position dtction signal (POT pin) from th on-shot timr (T pin) whos priod dpnds on th rsistanc of a potntiomtr connctd to th srvo's driv shaft. This fdack is what provids th staility for th control circuitry. (4) Puls Strtchr Th diffrnc twn th srvo control signal and th fdack signal is th rror signal. This rror signal is usd to toggl th dirction th currnt flows through th srvo. Th function of this puls strtchr is to strtch th small rror signal long nough and incrass th duty cycl to th motor for it can maintain sufficint holding forc. Th circuit also implmnts a dad and function that prvnts srvo jittr and hunting. This is a rang ovr which diffrncs twn th input and rfrnc signals will not caus srvo opration. Whn th signal diffrncs xcd this dad and rang, driv to th motor occurs.srvo's driv shaft. Th dad and will chang according to th valu of rsistor connctd to th RB pin. (5) irctional ogic ontrol Th comparator circuit compars pulss from th srvo control input (VIN pin) and th voltag controlld puls gnrator and provids ithr a positiv or a ngativ output dpnding on whthr th signal puls width is largr or smallr than th position gnrator s output puls (POT pin). Application of this rror voltag to th motor drivr circuit causs th motor to turn in a dirction that will minimiz th rror until oth puls widths ar th sam. (6) PWM ontrol opyright 3

4 This signal gnratd y dirctional logic control lock is usd to control a flip-flop that toggls th dirction th currnt flows through th motor. Th outputs of th flip-flop driv an H-Bridg output drivr lock that handls th high currnt going through th motor. This locks output will turnd on or off with ach input puls asd on th status of th dirctional logic. Th PWM driv tchniqus provid th nfits of rducd powr dissipation, improvd srvo motor prformanc and positivly affct systm fficincy. (7) Output drivr Th output drivr controls th srvo currnt dirction. For light load application, th srvo can connctd with OUT1 and OUT2 pin only. For havy load application, th XP1 and XP2 pin will connctd to th as of th xtrnal PNP transistor. It drivs in an H-ridg configuration (Th sink NPN drivrs ar uilt insid th chip). TYPIA APPIATION XAMP A. Mini-Srvo Application (No xtrnal drivrs ndd) opyright 4

5 B. Half H-Bridg application using two xtrnal PNP drivrs. Full H-Bridg application using two PNPs and two NPNs opyright 5

6 . Full H-Bridg application using two PMOSs and two NMOSs Not: Pin no. is for AP, plas rfr to PIN SRIPTION for othr packag typ. ORRING INFORMATION Part numr Packag Rmarks AP 16-pin Plastic TSSOP P 16-pin Plastic SSOP FP 16-pin Plastic SSOP(F) PP 14-pin IP opyright 6

7 PAKAG IMNSIONS AP - 16-pin Plastic TSSOP 1 AP 12 (4X) A SYMBOS 1 y IMNSIONS IN MIIMTRS MIN A NOM MAX IMNSIONS IN INHS MIN NOM MAX NOT 1. PAKAG BOY SIZS XU MO FASH PROTRUSIONS OR GAT BURRS 2. TORAN +/- 0.1 mm UNSS OTHRWIS SPIFI 3. OPANARITY : 0.1 mm 4. ONTROING IMNSION IS MIIMTR. ONVRT INH IMNSIONS AR NOT NSSARIY XAT. 5. FOOW FROM J MO opyright 7

8 P - 16-pin Plastic SSOP 1 P 12 (4X) A SYMBOS IMNSIONS IN MIIMTRS MIN NOM MAX IMNSIONS IN INHS MIN NOM MAX A y NOT 1. PAKAG BOY SIZS XU MO FASH PROTRUSIONS OR GAT BURRS 2. IMNSION IS MASUR IN GAG PAN 3. TORAN +/- 0.1 mm UNSS OTHRWIS SPIFI 4. ONTROING IMNSION IS MIIMTR. ONVRT INH IMNSIONS AR NOT NSSARIY XAT. 5. FOOW FROM J MO opyright 8

9 FP - 16-pin Plastic SSOP(F) 1 FP NOT 5 12 (4X) A SYMBOS 1 y IMNSIONS IN MIIMTRS MIN A NOM MAX NOT 1. PAKAG BOY SIZS XU MO FASH PROTRUSIONS OR GAT BURRS 2. IMNSION IS MASUR IN GAG PAN 3. TORAN 0.1 mm UNSS OTHRWIS SPIFI 4. ONTROING IMNSION IS MIIMTR. ONVRT INH IMNSIONS AR NOT NSSARIY XAT. 5. I PA XPOSUR SIZ IS AORING TO A FRAM SIGN. 6. FOOW FROM J MO IMNSIONS IN INHS MIN NOM MAX opyright 9

10 PP 14-pin IP SYMBOS MIN. NOR. MAX. A BS B UNIT : INH NOTS: 1. J OUTIN : MS-001 AA 2., 1 IMNSIONS O NOT INU MO FASH OR PROTRUSIONS MO FASH OR PROTRUSIONS SHA NOT X INH. 3. B IS MASUR AT TH A TIPS WITH TH AS UNONSTRAIN. 4. POINT OR ROUN A TIPS AR PRFRR TO AS INSRTION. 5. ISTAN BTWN AS INUING AM BAR PROTRUSIONS TO B INH MININUM. 6. ATUM PAN H OININT WITH TH BOTTOM OF A WHR A XITS BOY. NOTS ON US AGAMM MIROTRONIS INOPRATION RSRVS TH RIGHT TO MAK HANGS WITHOUT FURTHR NOTI TO ANY PROUTS HRIN TO IMPROV RIABIITY, FUNTION OR SIGN. AGAMM OS NOT ASSUM ANY IABIITY ARISING OUT OF TH APPIATION OR US OF ANY PROUT OR IRUIT SRIB HRIN; NITHR OS IT ONVY ANY INS UNR ITS PATNT RIGHTS, NOR TH RIGHTS OF OTHRS. Th application circuit xampls xplain typical applications of th products, and do not guarant th succss of any spcific mass-production dsign. Application circuit diagrams and circuit constants containd hrin ar shown as xampls of standard us and opration. Plas pay carful attntion to th priphral conditions whn dsigning circuits and dciding upon circuit constants in th st. Tak account of common impdanc whn dsigning th arth lin on a printd wiring oard. opyright 10