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 fd178a/FD178B/fd178c version : a.010 issue date : 2011/3/1 file name : sp-fd178-a.010.doc total pages : 10 single coil brushless dc motor drivers with soft-switching and pwm control ( 2 to 6.5 volts )
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 1 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c general specifications designed for rotation speed control of sing le coil dc brushless fans, the fd178 series motor drivers minimize external component count and in tegrate all the key features required for high efficiency and low noise fans. specifically pwm control and soft switching are provided to control the rota tion speed and reduce the audible noise. internal circuit protection includes thermal s hutdown with hysteresis, rotor lock protection, and reverse power polarity protection. th ree frequency generation (fgr pin) options are provided for different fan configurations - fg (fgr signal followi ng hall sensor output frequency), fg/2 (divided by two version of fg), and rd (rotation detection) for fd178a, FD178B, and fd178c respectively. features and benefits z support single-phase full wave brushless dc motor driver z built-in hall sensor input signal amplifier z pwm control circuit z low voltage startup (vdd=2v) z high driving capability z lock detection and automatic self-restart z power polarity reverse protection z thermal shut down protection circuit z thin, compact, highly reli able package (tsot-28) pin description fd178a/FD178B/fd178c tsot-28 package : tsot-28 no. name description 1 o1 output driving & sinking pin 1 2 vss ground pin 3 fgr frequency generator or rotating detector fd178 fg FD178B fg/2 fd178c rd 4 hp hall sensor in+ 5 hn hall sensor in- 6 pwm pwm control pin 7 vdd power supply pin 8 o2 output driving & sinking pin 2 o1 o2 vss vdd hn hp pwm fg r tsot
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 2 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c absolute maximum ratings ( unless otherwise noted, vdd=5v, t a = 25 c ) characteristic symbol rating unit supply voltage v ddm 6.5 v operation current i out 500 ma output current at locked (tsot-28) i ol1 1 a maximum fgr output current i fgr_max 10 ma maximum fgr output voltage v fgr_max 6.5 v operating temperature range t opr -30 ~ 85 c storage temperature range t stg -65 ~ 150 c power dissipation (tsot-28) p d 568 mw thermal resistance, junction to ambient j a_tsot28 220 c/ w thermal resistance, junction to case jc_tsot28 92 c/ w maximum junction temperature tj(max) 150 c
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 3 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c electrical characteristics ( unless otherwise noted, vdd=5v, t a = 25 c ) limit characteristic sym. condition min. typ. max. unit operation voltage v dd - 2 5 6.5 v supply current icc - 3 5 ma maximum output voltage range v oh i out = 250 ma 4.5 4.65 - v minimum output voltage range v ol i out = 250 ma - 0.35 0.5 v fg output low voltage v fgrol i fgr = 5 ma - 0.25 0.4 v hall amplifier offset v offset - -9 0 9 mv input-output gain g io - 45 48 51 db automatic self-restart lock detection on time t on - 110 150 190 ms lock detection off time t off - 0.75 1.05 1.35 sec pwm signal control pwm input frequency v pwm - - 25 50 khz pwm input high level voltage *1 v ih - 0.55vdd vdd vdd+0.4 v pwm input low level voltage *1 v il - -0.3 0 0.2vdd v hall signal output hall average output dc voltage v dc - 400 - - mv hall amplitude of waveform voltage v am - 150 - - mv *1 description in the page4 ?pwm input high and low level voltage?
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 4 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c thermal shut down protection circuit shut down temperature - 160 180 200 release temperature - 120 140 160 truth table pwm hall input o1 o2 l x l l h hp > hn h l h hp < hn l h v ih,min v il,max v pwm o1, o2 v dd
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 5 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c hall signal ? for a stable operation, the hall sensor output is requi red to meet the following conditions. (a) the dc level of hall si gnal is greater than 400 mv (b) the amplitude of hall signal is greater than 150mv application circuit ? the connection of the capacito between vdd and gnd will increase stability of operation, if required. hp or hn v dc v amplitude
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 6 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c output waveform pwm hp hn o1 o2 pwm control pwm hp hn o1 o2
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 7 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c application notes ? the device can be operated with a wide supply voltage ranging from 2 to 6.5 volts. however, the design, specifications, and performance have been optimized for 5v brushless dc motor applications. ? the output driver node o1/o2 are in drive/ sink state when v(hp) > v(hn) and vice versa ? the lock and auto-restart do not require an external capacitor for a timing counting purpose. the driver will be shutdown approx imately 1 second after the motor is lock and the auto-restart is activated ever y one second until the lock is released. ? eliminating an external protec tion diode, a power polarity reve rse circuit is integrated on the chip. ? a 1uf capacitor between vdd and gnd as well as a 0.1uf between hp and hn are strongly recommended for a reli able and noise immune operation. ? the power dissipated by the chip varies with the supply voltage. it is advisable to ensure the power dissipation by the chip does not exceed the thermal re quirement dictated by the package. the maximum allowable power consumption can be calculated by the following equation: ) / )( , tan re ( ) )( ( ) )(max)( ( ) )( ( watt c ambient to junction ce sis thermal c e temperatur ambient ta c e temperatur junction tj watt n dissipatio power pd o ja o o ? = the relationship between power dissipation a nd operating temperature can refer to the figure below:
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 8 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c package specifications fd178 : tsot-28 variation(all dimensions shown in mm) symbol min. nom. max. a 0.750 - 0.800 a1 0 - 0.050 a2 0.700 0.750 0.775 b 0.220 - 0.380 c 0.100 - 0.200 d 2.800 2.900 3.000 e 2.600 2.800 3.000 e1 1.500 1.600 1.700 e 0.650 bsc e1 1.950 bsc l 0.370 0.450 0.600 l1 0.600 ref l2 0.250 bsc r 0.100 - - r1 0.100 - 0.250 0 o 4 o 8 o 1 4 o 10 o 12 o 80g fd178a 8bg FD178B 8cg fd178c is the run code. g is green. g
single coil brushless dc motor drivers with soft-switching and pwm control version a.010 page 9 ??u}u??_??????P? unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement. f d178 a /FD178B/fd178c the products listed herein are designed fo r ordinary electronic applications, such as electrical appliances, audio-vi sual equipment, communications devices and so on. hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prev ention equipment and the like. misusing those products may directly or indire ctly endanger human life, or cause injury and property loss. silicon touch technology, inc. will not take any responsibilities regarding the misusage of the products mentioned above. anyone who purchases any products described herein with the above -mentioned intenti on or with such misused applications should accept fu ll responsibility and indemnify. silicon touch technology, inc. and its distributors and all their officers and employees shall defend jointly and severally agains t any and all claims and litigation and all damages, cost and expenses a ssociated with such intention and manipulation. silicon touch technology, inc. reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information bei ng relied on is current and complete.
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