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unisonic technologies co., ltd ua9849 linear integrated circuit www.unisonic.com.tw 1 of 11 copyright ? 2008 unisonic technologies co., ltd qw-r109-006,b 3-phase motor driver for cd-roms ? description the utc ua9849 is ics developed for cd-rom spindle motor drives. these ics possess a short brake and reverserotation brake for two types of brake functions, and also contain fg output and rotation dire ction detection (fr) circuits, making them high-functionality and high-performance ics. ? features * three-phase, full-wave, pseudo-linear drive system. * built-in power save and thermal shutdown functions. * built-in current limiter and hall bias circuits. * built-in fg output. * built-in rotation direction detector. * built-in reverse rotation prevention circuit. * built-in short brake pin. hsop-28 lead-free: ua9849l halogen-free: ua9849g ? ordering information ordering number normal lead free halogen free package packing ua9849-sh1-t ua9849l-sh1-t UA9849G-SH1-T hsop-28 tube
ua9849 linear integrated circuit unisonic technologies co., ltd 2 of 11 www.unisonic.com.tw qw-r109-006,b ? pin description pin # pin name functoin 2 a3 output 4 a2 output 7 a1 output 8 gnd gnd 9 h1 + hall signal input 10 h1 - hall signal input 11 h2 + hall signal input 12 h2 - hall signal input 13 h3 + hall signal input 14 h3 - hall signal input 15 v h hall bias 17 c nf for connection of phase compensation capacitor 18 sb short brake 20 fr rotation direction detection 21 e cr output voltage control reference 22 e c output voltage control 23 ps power save 24 fg fg signal output 25 v cc power supply 26 v m2 motor power supply 2 27 v m1 motor power supply 1 28 r nf for connection of output current detection resistor fin - sub gnd
ua9849 linear integrated circuit unisonic technologies co., ltd 3 of 11 www.unisonic.com.tw qw-r109-006,b ? block diagram a8 a2 2 4 7 a1 8 9 gnd h 1 + h 1 - 10 11 h 2 + h 2 - 12 13 h 3 + 14 h 3 - vh 15 17 cnf sb 18 fr 20 21 ecr 22 e c 23 ps fg 24 25 v cc 26 vm2 27 vm1 rnf 28 v cc current sence amp tsd driver driver tl hall amp + - + - + - - + - + - + - ps torque sense amp v cc short break r q d ck q hall bias +
ua9849 linear integrated circuit unisonic technologies co., ltd 4 of 11 www.unisonic.com.tw qw-r109-006,b ? absolute maximum ratings parameter symbol ratings unit applied voltage ( with 5v power supply) v cc 7 v applied voltage ( motor power supply1 ) v m1 16 v applied voltage ( motor power supply2) v m2 16 v output current(note 4) i out 1 . 3 a power dissipation(note 2) p d 2.2 w operating temperature t opr -20 ~ 75 c storage temperature(note 3) t stg -55 ~ 150 c note: 1. 2. 3. 4. absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. reduced by 17.6mw for increase for t a of 1 c over 25 c t j should not exceed 150 c t j should not exceed p d or aso value. ? recommended operating conditions (t a =25 c) parameter symbol min typ max unit v cc 4.25 5.5 v m1 3.0 15 power supply voltage v m2 3.0 15 v ? electrical characteristics (t a =25 c, v cc =5v, v m1 =12v, v m2 =12v, unless otherwise specified.) parameter symbol test conditions min typ. max unit total device circuit current 1 i cc 1 in the power save on state 0 0.2 ma circuit current 2 i cc 2 in the power save off state 4.1 6.5 ma power save on voltage range v pson 1.5 v off voltage range v psoff 3.5 v hall bias hall bias voltage v hb i hb =10ma 0.5 0.9 1.5 v hall amplifier input bias current i ha 0.7 3.0 a same phase input voltage range v har 1.5 4.0 v minimum input level v inh 50 mv p-p h3 hysteresis level v hys 10 20 40 mv torque command input voltage range e c 1.0 4.0 v ?-?offset voltage e coff- e cr =2.5v -80 -50 -20 mv ?+?offset voltage e coff+ e cr =2.5v 20 50 80 mv input bias current e cin ecr= ec 0.5 2.0 a i/o gain g ec e c =1.5v,2.0v 0.41 0.51 0.61 a/v fg fg output high level voltage v fgh i fg = -20a 4.5 4.8 v fg output low level voltage v fgl i fg =3ma 0 0.25 0.4 v duty (reference value) du 50 % rotation detection fr output high level voltage v frh v frh = -20a 4.1 4.4 v fr output low level voltage v frl i fr = 3a 0 0.25 0.4 v
ua9849 linear integrated circuit unisonic technologies co., ltd 5 of 11 www.unisonic.com.tw qw-r109-006,b ? electrical characteristics(cont.) parameter symbol test conditions min typ. max unit output output saturation high level voltage v oh i o = -600ma 1.0 1.5 v output saturation low level voltage v ol i o = 600ma 0.4 0.8 v pre-drive current i vml e c =0v output open 35 70 ma output limit current i tl 560 700 840 ma short brake on voltage range v sbon 3.5 v off voltage range v sboff 1.5 v note: not designed forradiation resistance.
ua9849 linear integrated circuit unisonic technologies co., ltd 6 of 11 www.unisonic.com.tw qw-r109-006,b ? input/output circuit (1) power save (2) torque command input (3) torque output (a1,a2,and a3) a1 a2 a3 rnf vm2 vm1 external resistor (rnf) gnd fig.3 (4) hall input (h1+,h 1-,h2+,h2-,h3+,h3-)
ua9849 linear integrated circuit unisonic technologies co., ltd 7 of 11 www.unisonic.com.tw qw-r109-006,b ? input/output circuit(cont.) (5) hall bias (6) fg output (7) fr output 30k fr fig.7 (8) short brake note: resistance values are typical values.
ua9849 linear integrated circuit unisonic technologies co., ltd 8 of 11 www.unisonic.com.tw qw-r109-006,b ? circuit operation (1) hall input to coil output the phase relationship between the hall input signals and t he output current and voltage is shown in fig.9. the motor position data input via the hall pins is amplified by the hall amplifier, and formed into waveforms by the matrix block. these signals are input to the output driver t hat supplies the drive current to the motor coils.
ua9849 linear integrated circuit unisonic technologies co., ltd 9 of 11 www.unisonic.com.tw qw-r109-006,b ? circuit operation(cont.) (2) torque command the rnf pin voltage with respect to the torque command (ec) is as follows: the i/o gain (gec) from the ec pin to the rnf pin (out put current) is determined by the rnf detector resistor. gec = 0.255 / rnf [a / v] the torque limit current itl is given by: itl = 0.35 / rnf [a] rotation direction ececr reverse(note) note: stops after detecting reverse (3) reverse rotation detection function + - + - d-ff d ck q + - h 2 + h 2 - h 3 + h 3 - ec e cr h:output .open (high-impedance) fig.11 fr signal output pin forward l reverse h the reverse detection circuit construction is shown in fig.11. (1) forward (ec < ecr) the phase relationship between the hall input signals h 2 + and h 3 + becomes as shown in fig.9, and the reverse rotation detection circuit does not operate. (2) reverse (ec > ecr) the phase relationship between the signals h 2 + and h 3 + is opposite that for forward operation, and the reverse rotation detection circuit operates. the output goes off, and becomes open circuit. (3) short brake when 3.5v or more is applied to t he short brake pin, the upp er-side output transistors of all go off, and the lowerside output transistors go on. short braki ng operates regardless of the torque command signal. (4) other circuits when 3.5v or more is applied to the power save pin, all circuits are on. when 1.5v or less is applied, the ic enters power save mode. also, the hall bias pins turn on and off with the power save pin.
ua9849 linear integrated circuit unisonic technologies co., ltd 10 of 11 www.unisonic.com.tw qw-r109-006,b ? typical application q current sense amp v cc v cc 25 26 vm2 vm1 27 28 rnf fg 24 + - ps 23 ps e c 22 vm rnf servo signal ecr 21 - + fr 20 sb 18 r torque sense amp cnf 17 15 vh hall bias short brake q ck d + - + - - + - + + - tl driver driver a3 2 a2 4 a1 8 gnd h 1 + 10 h 1 - h 2 + 11 h 2 - 12 h 3 + 13 h 3 - 14 hall 3 hall 2 hall 1 tsd
ua9849 linear integrated circuit unisonic technologies co., ltd 11 of 11 www.unisonic.com.tw qw-r109-006,b ? operation notes (1) power save the power save input is an i / o circuit like the own shown in fig.1. the thermal derating characteristics of the power save pin is ?8mv / c, and the resistance will fluctuate between 30% so be careful of the input voltage range. (2) hall input the input circuit shown in fig.4 is used for the hall inputs. the hall elements can be connected either in series or in parallel. (3) thermal shutdown (tsd) when the junction temperature reaches 175 c, the a1, a2, and a3 coil outputs go open circuit. the thermal shutdown has approximately 15 c of hysteresis. h 2 h 3 h 1 (hall bias) parallel connection vcc h 1 h 2 h 3 (hall bias) vcc series connection utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.

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