silicon touch technology inc. ?W@^?I????? 9-7f-1 prosperity road i science-based industrial park hsinchu, taiwan 300, r.o.c. tel 886-3-5645656 fax 886-3-5645626 ST1117A/b/c version : a.007 issue date : 2004/09/10 file name : sp-ST1117Abc-a.007.doc total pages : 7 single coil brushless dc motor drivers ( 1.5 to 8.5 volts )
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 1 ST1117A / st1117b / st1117c single coil brushless dc motor drivers ( 1.5 to 8.5 volts ) general specifications the device is a single coil dc brushless mo tor driver ic with pwm control, lock protection, power polarity reve rse protection and frequency generator. the driver is optimal for single coil fan applications with less external components. features and benefits z support single-phase full wave brushless dc motor driver z built-in hall sensor input amplifier z low voltage startup (vdd=1.5v) z high output sinking and driving capability z lock detection and automatic self-restart z without external timing capacitor, reduces the numbers of external component required z external pwm control signal input z with fg/2 output, suitable for 8-poles fan motor for ST1117A with fg output, suitable for 4-poles fan motor for st1117b with rd output for st1117c z thin, compact, highly reliable package (sot-28) pin description no. name description 1 o1 output driving & sinking pin 2 vss ground pin 3 fgr frequency generator or rotating detector ST1117A : fg/2 st1117b : fg st1117c : rd 4 hp hall sensor in+ 5 hn hall sensor in- 6 pwm input pin for pwm control 7 vdd power supply pin 8 o2 output driving & sinking pin o1 o2 vss vdd hn hp pwm fg r
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 2 absolute maximum ratings ( unless otherwise noted, t a = 25 c ) characteristic symbol rating unit supply voltage v dd 7.5 v input voltage from a hall effect latch output v in v dd +0.4 v output current i out 400 ma output current at lock i ol 700 ma power dissipation p d 350 mw operating temperature range t opr -40 ~ 125 c storage temperature range t stg -65 ~ 150 c operating junction temperature t j 125 c thermal resistance, junction to ambient ja 218 c/ w notes:* the maximum power supply voltage & output current must be under the allowable package power dissipation. electrical characteristics ( t a = 25 c , v dd = 5v ) limit characteristic sym. condition min. typ. max. unit supply voltage v dd operating 1.5 5 7.5 v hp/hn input terminal ( t j = 25 ) hall input sensitivity v hn zero to peak - 7 25 mv pwm input terminal ( t j = 25 ) input voltage ?h? v ih - 0.5*v dd - v dd +0.4 v input voltage ?l? v il - -0.4 - 0.15*v dd v input current ?h? i ih v in = v dd - - 1 a input current ?l? i il v in = 0v - - 1 ma o1/o2 output terminal ( t j = 25 ) output voltage high v oh i out = 300 ma 4.6 - - v output voltage low v ol i out = 300 ma - - 0.3 v output current i out r l = 30 - 150 - ma fgr open-drain terminal ( t j = 25 ) output leakage current i leak v fgr = 5v - - 1 a output current i fgr v fgrol = 0.4v 5 - - ma output voltage low v fgrol i fgr = 5 ma - - 0.4 v automatic self-restart circuit on time t on - - 175 - ms duty ratio r dr t off / t on 6 7 8
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 3 truth table hp hn pwm o1 o2 h l h h l l h h l h - - l off off block diagram & application circuit hall sensor logic block + - power fg / rd lock detector frequency generator / rotating detector drivers vdd hn gnd fgr o1 o2 hp pwm *3 *1 *2 amp power *1, *2, *3 : the zener diode and capacitors will increase system stability, if required.
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 4 application notes ? with low voltage start-up feature, the device is operated within wide supply voltage range from 1.5 to 7.5 volts. the design, specifications and performance have been optimized for 3v and 5v brushless dc motor applications. ? the output driver node o1/o2 will be ?tur ned to sink/drive? for v(hin) = logic low. similarly, the output o1/o2 will be ?turned to drive/sink? for v(hin) = logic high . ? the fgr pin is an open-drained output. the out put frequency is dividing the hall switching frequency with 2 for ST1117A, th e same frequency with hall switching for st1117b, and the rotating detection for st1117c. with suitable pull up, the fan tachometer output can be used directly with bipol ar or mos logic for motor speed monitoring/control. to get better fg signal output, incr easing stability of power system is required. ? the pull up resistor about 20k ? is connected to pwm pin. the pwm command is active high. if low acoustic noise is desired, the pwm frequency range below 200hz or 20khz ~ 40khz is recommended . ? there is no need of external timing capaci tor for lock protection and auto-restart function. for 5v application, the drivers will be shut down roughly 1 to 3 seconds after the motor is locked. when the dr ivers have been shut down, the automatic self-restart circuit w ill try to power up the drivers every 1 to 3 seconds until lock is released. ? there is no requirement of protection diode for power reverse fault in normal applications. the power polarity reve rse protection circuit is built-in. ? the capacitor between two ends of coil ( *3 in application circuit) is proposed to connect 0.1 f for pwm application and 1 f for full-speed application. ? the connection of the capacitor or zene r diode (*1 in application circuit) between vdd and gnd, the capacitor (*2 in application circ uit) between two hall sensor output and the capacitor (*3 in application circuit) between two ends of coil will increase system st ability when motor is rotating.
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 5 ? the power dissipated by the ic varies wi dely with the supply voltage, the output current, and loading. it is important to ensure the application does not exceed the allowable power dissipation of th e ic package. the recommended motor driver power dissipation versus te mperature is depicted as follows: power dissipation-temperature 0 50 100 150 200 250 300 350 400 0 25 50 75 100 125 150 ambient temperature ( ) power dissipation (mw )
c???? silicon touch technology inc. ST1117A / st1117b /st1117c sp-ST1117Abc-a.007 version a.007 page 6 package specifications ( sot-28 ) dimensions in millimeters symbol min nom max a 1.00 1.10 1.30 a 1 0.00 0.10 a 2 0.70 0.80 0.90 b 0.35 0.40 0.50 c 0.10 0.15 0.25 d 2.70 2.90 3.10 e 1.40 1.60 1.80 e 1.90(typ) h 2.60 2.80 3.00 l 0.37 1 1 5 9 (8-pin sot-28 ) d e h b a 1 e a a 2 1 c l * note : the ?7ann? is the package marking where the first two characters ?7a? are product identification code shown as following table, the last 2 characters "nn" are date code or lot number, and therefore being subject to change. product mark(id + date code) ST1117A 7ann st1117b 7bnn st1117c 7cnn 7ann* the products listed herein are designed for ordinary electronic a pplications, such as electrical appliances, audio-visual equi pment, communications devices and so on. hence, it is advisable that the devices s hould not be used in medical instruments, surgical implants, aerospace machiner y, nuclear power control systems, disaster/crime-prevention equipment an d the like. misusing those products may directly or indirectly en danger human life, or cause injury and property loss. silicon touch technology, inc. will not ta ke any responsibilities regarding the misusage of the products mentioned a bove. anyone who purchases any products described herein with the above-mentioned inte ntion or with such misused applications should accept full responsibility and indemn ify. silicon touch technology, inc. and its distributors and all their of ficers and employees shall de fend jointly and severally against any and all claims and litigation and a ll damages, cost and expenses associated with such intention and manipulation.
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