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mp6505 4.5v-to-16v,400ma, single-phase brushless-dc?motor driver mp6505 rev.1.0 www.monolithicpower.com 1 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the mp6505 is a single-phase brushless-dc? motor driver, with an input voltage range of 4.5v to 16v and a maximum output current of 400ma. the mp6505 controls the rotational speed through either the input voltage or the pwm signal. other features include minimum- rotational?speed set, a rotational speed indicator, built-in input over-voltage protection, built-in locked-rotor protection, locked-rotor?state indicator, thermal shutdown, and a 1.2v integrated hall bias voltage. the mp6505 is available in 5.0mm6.4mm tssop16 and 3mm3mm qfn16 package. features ? operating voltage of 4.5v to 16v ? integrated power mosfets (hs: 370m ? ; ls: 230m ? ) ? maximum output current 400ma ? low quiescent current (not including hall sensor) of 1.4ma ? speed control by input voltage or pwm signal ? programmable minimum speed ? rotational-speed indicator ? locked-rotor indicator ? locked-rotor protection and automatic recovery ? thermal protection and automatic recovery ? built-in input ovp and automatic recovery ? hall bias voltage(1.2v) integrated ? available in tssop16 (5.06.4mm) and qfn16 (33mm) package applications ? cpu fan for personal computers or servers ? brushless dc motor driver a ll mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application
mp6505-single-phase, brushless-dc?motor driver mp6505 rev.1.0 www.monolithicpower.com 2 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ordering information part number package top marking mp6505dm* tssop16(5.06.4mm) mp6505 MP6505DQ** qfn16(33mm) adb * for tape & reel, add suffix ?z (eg. mp6505dm?z); for rohs compliant packaging, add suffix ?lf (e.g. mp6505dm?lf?z) * for tape & reel, add suffix ?z (eg. MP6505DQ?z); for rohs compliant packaging, add suffix ?lf (e.g. MP6505DQ?lf?z) package reference top view tssop16 qfn16 absolute maximum ratings (1) v cc ...................................................... 0v to 20v out1, out2 ...................................... -1v to 20v fg, rd ............................................ -0.3v to 18v all other pins .................................. -0.3v to 6.5v continuous power dissipation (t a = 25c) (2) tssop16 ................................................. 1.17w qfn16 ..................................................... 1.75w junction temperature ............................... 150c storage temperature ............... -55c to +150c recommended operating conditions (3) v cc ................................................... 4.5v to 16v vth ....................................................... 0v to 6v in+, in- .............................................. 0.2v to 3v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc tssop16 (5.06.4mm) .......... 90 ...... 30 ... c/w qfn16 (33mm) ..................... 60 ...... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions.(for vcc voltage range, it doesn?t include the external input diode voltage drop) 4) measured on jesd51-7, 4-layer pcb.
mp6505-single-phase, brushless-dc?motor driver mp6505 rev.1.0 www.monolithicpower.com 3 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characterics t a =25c, v cc =12v, unless otherwise noted. parameter symbol condition min typ max unit circuit current in locked-rotor protection mode i cc v cc =20v 1.0 1.4 2 ma reference voltage v ref i vref =5ma 5.6 5.9 6.2 v hb voltage v hb i hb =5ma 1.1 1.15 1.2 v cosc high voltage v cosc h 3.45 3.6 3.75 v cosc low voltage v cosc l 1.8 1.95 2.1 v cosc oscillator frequency f cosc cp=100pf 26.4 31 35.6 khz ct pin high voltage v cth 3.4 3.63 3.86 v ct pin low voltage v ctl 1.63 1.73 1.83 v i ct charge current i ct1 1.1 1.95 2.85 a i ct discharge current i ct2 0.08 0.16 0.25 a i ct charge/discharge ratio r ct 7 12 18 high-side switch-on resistance r ds1 v cc =12v t a =25c 370 420 m ? low-side switch-on resistance r ds2 v cc =12v t a =25c 230 260 m ? current limit gain g c 9 a/v current limit i peak in+ ? in- =50mv 0.45 0.8 a in+ ? in- =100mv 0.9 1.3 under-voltage lockout threshold? rising 3.57 3.75 3.93 v under-voltage lockout threshold? hysteresis 190 mv rd/fg output pin low-level voltage v rdl/fgl i rd/fg =5ma 0.35 v rd/fg output pin leakage current v rdl/fgl v rd/fg =12v 0.1 1 a ovp threshold rising 19 20 21 v ovp threshold hysteresis 1.7 v
mp6505-single-phase, brushless-dc?motor driver mp6505 rev.1.0 www.monolithicpower.com 4 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pin functions pin # (tssop16) pin # (qfn16) name description 1,16 13,15 p-gnd power ground. 2 16 out1 motor driver output 1. 3 14 vcc power supply. 4 1 rmi minimum rotational speed set. 5 2 vth rotational speed control. use dc voltage or pwm signal. 6 3 cosc oscillator setting. connect this pin to an external capacitor to set the switch frequency. 7 4 fg rotational speed detector. connect to an external power source through a pull-up resistor. 8 5 rd locked-rotor protection detector. connect to an external power source through a pull-up resistor. 9 6 in+ hall sensor input+. for rotor posi tion detection and current limit setting. 10 7 hb hall sensor bias regulator ou tput. powers the external hall sensor. 11 8 in- hall sensor input-. for rotor po sition detection and current limit setting. 12 9 vref reference voltage output. 13 10 ct locked-rotor protection and recovery time set. connect to an external capacitor to set the recovery time. 14 11 s-gnd ground for control circuit. 15 12 out2 motor driver output 2. exposed pad nc not connected. connect exposed thermal pad to power ground for better thermal performance.
mp6505-single-phase, brushless-dc?motor driver mp6505 rev.1.0 www.monolithicpower.com 5 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical characteristics v in =12v, f cosc =30khz frequency (khz) vhb (v) vref (v) icc vs. temperature vcc breakdown voltage vs. temperature vhb vs. temperature vref vs. temperature frequency vs. temperature icc (ma) vcc bv (v) -40 -20 0 20 40 60 80 100 120140 -40 -20 0 20 40 60 80 100120 140 -40 -20 0 20 40 60 80 100120140 1.13 1.134 1.138 1.142 1.146 1.150 1.154 1.158 1.162 1.166 1.17 -40 -20 0 20 40 60 80 100 120140 5.800 5.825 5.850 5.875 5.900 5.925 5.950 5.975 6.000 -40 -20 0 20 40 60 80 100 120 140 uvlo vs. temperature uvlo (v) 3.70 3.71 3.72 3.73 3.74 3.75 -40 -20 0 20 40 60 80 100 120 140 1.40 1.45 1.50 1.55 1.60 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 26.0 29.0 29.5 30.0 30.5 31.0 31.5 32.0
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 6 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics f cosc =30khz, ct=1 f, vth=0v, v in =12v, c in =10 f, l motor =5mh, r motor =10 ? , t a =25c, unless otherwise noted. v out1 10v/div. v out2 10v/div. v fg 5v/div. i out 1a/div. steady state v out1 10v/div. v out2 10v/div. v in 10v/div. i out 2a/div. v out1 10v/div. v out2 10v/div. v in 10v/div. i out 1a/div. v out1 10v/div. v out2 10v/div. v rd 5v/div. i out 1a/div. power ramp down power ramp up locked-rotor protection
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 7 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. block diagram figure 1: functional block diagram
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 8 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. function description motor driver out1 and out2 pins drive the motor. the maximum total continuous output current is 400ma at room temperature. the peak output current value is proportional to the hall sensor output voltage of (v in+ ?v in- ). frequency setting a capacitor at the cosc pin sets the frequency. for most applications, use a 100pf capacitor for an oscillator/typical pwm frequency of 30khz. minimum speed the voltage on rmi pin sets the minimum pwm duty cycle, which sets the lowest speed. connect to vth if not used. locked-rotor detection the rd pin is the locked-rotor detector, and is the output of an open collector. it goes low when the motor rotates and goes into high impendence if the motor is in a locked-rotor state. leave it open if not used. speed detection the fg pin is the rotational speed detector, and is the output of an open collector. it outputs a high or low voltage relative to the hall comparator?s output. higher speeds produce higher-frequency signals. leave it open if not used. current limit and the hall signal an internal amplifier with hysteresis amplifies the differential hall signal: the output of this amplifier serves as the current-limit value. the differential hall voltage drops to 0v whenever an opposing magnet passes the hall sensor to limit the peak current during commutation. the hall sensor is directly powered by a 1.2v voltage on the hb pin. input over-voltage protection the reverse current generated with every commutation charges the input capacitor and causes a periodic voltage spike at the input pin. the internal input over-voltage protection (ovp) circuit turns off two hs switches when a spike exceeds 20v, and recovers from ovp when the spike is less than 18v. working mode the driver has operates in one of four modes under normal conditions, as shown in figure 2. the following describes each mode: ? minimum speed mode this mode runs the motor at the slowest motor speed. it uses a thermistor to provide the vth signal and compares it against rmi to determine the slowest motor speed. at low temperatures, vth exceeds rmi. the device compares v cosc against rmi to generate a pwm signal, pwm -rmi , to control the motor speed. removing the thermistor causes vth and the motor speed to reach their respective maxima and minima. ? variable speed mode when the vth signal falls below rmi, the device compares v cosc against vth to generate a pwm signal of pwm -vth to control the motor speed. in general, vth controls the pwm duty cycle, and therefore the motor speed. ? full-speed mode when the vth signal is less than v cosc(min) , the pwm duty is 100% and the motor speed is at its maximum. ? locked-rotor?protection mode an internal current source, i ct1 , charges the capacitor at the ct pin; changing the hall comparator?s output provides a reset signal to drive an internal switch to discharge this capacitor to v ctl . if the motor rotor is locked, the hall comparator?s output will not change. once the voltage on the capacitor goes to v cth , the driver enters locked-rotor?protection mode and another current source, i ct2 , discharges the ct capacitor . during this period, the pwm duty cycle goes to 0% and the rd pin is in a high-impedance state. when the voltage on the capacitor drops to 0v, i ct1 charges the capacitor again. the pwm signal resumes switching to try to drive motor again. if the rotor remains locked, the process repeats.
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 9 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. rmi vth 2v vcosc(min) minimum speed mode variable speed mode full speed mode locked -rotor protection mode fg vcosc ct rd vctl(1.7v) vcth(3.6v) low level high impedance high impedance lock protection mode (toff=5ton) ton rotating vcosc(max) 3.6v high impedance toff figure 2: driver operation mode
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 10 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. application information selecting the input capacitor the input capacitor absorbs excess armature inductor energy with every commutation. for typical applications, select c in 10f to provide a margin of safety for input ovp. motors with larger armature inductors require larger input capacitors. setting the frequency for most applications, use a 100pf capacitor for the c p capacitor to set the frequency to 30khz. f cosc is determined by: 6 osc p f310/c(hz) ? ?? connecting the motor figure 3 shows that the out1 and out2 connect to the motor armature: when v in+ exceeds v in- , sw1 and sw4 activate and current flows from out1 to out2; when v in- exceeds v in+ , sw2 and sw3 activate and current flows from out2 to out1. the opposing current directions generate opposing polarities in the armature winding. for most applications, carefully connect out1 and out2 to the motor terminators according to the hall sensor setting position. incorrect connections will cause abnormal motor function. figure 3: power stage design example below is an example design that follows the application guidelines for the given specifications: v in 4.5v to 16v i out (max) 400ma f cosc 30khz figure 4 shows a detailed application schematic. for more applications, please refer to the related evaluation board data sheets. figure 4: detailed application schematic
mp6505-single-phase brushless dc motor driver mp6505 rev.1.0 www.monolithicpower.com 11 3/14/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information qfn 16 (3x3mm) side view top view 1 16 13 12 9 8 5 4 bottom view 2. 90 3. 10 1.50 1.80 2.90 3.10 1.50 1.80 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters . 2) exposed paddle size does not include mold flash . 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-220, variation veed-4. 5) drawing is not to scale. pin 1 id see detail a pin 1 id option a 0.30x45 o typ. pin 1 id option b r0.20 t yp. detail a pin 1 id index area 0.70 0.30 0.50
mp6505-single-phase, brushless-dc?motor driver notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp6505 rev.1.0 www.monolithicpower.com 12 3/14/2012 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information tssop16 (5.0x6.4mm)

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