53007 ti pc b8-8438 no.a0818-1/8 specifications of any and all sanyo semiconductor co.,l td. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general el ectronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. LV8280T overview LV8280T is s sensorless motor driver that provides a reverse torque braking function and is appropriate for spindle motor drive in cd-rom, dvd and similar drives. this ic adopts a direct pwm drive technique and uses mosfets as its output transistors for highly efficient motor drive. since the LV8280T can implement a motor drive system without the use of hall-effect devices, it can contribute to motor system miniaturization, thinner form factors, and lower power consumption. features ? three-phase full-wave, sensorles dr ive method and direct pwm drive specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit power supply voltage v cc max 6.0 v motor power supply voltage vs max 6.0 v pre-drive voltage (gate voltage) vg max 10 v maximum output current i o max 1.0 a allowable power dissipation 1 pd max1 independent ic 0.5 w allowable power dissipation 2 pd max2 * mounted on a board. 1.2 w operating temperature topr -10 to +75 c storage temperature tstg -40 to +150 c * : mounted on a board : 76.1 114.3 1.6mm 3 , glass epoxy board bi-cmos lsi dvd-rom spindle motor driver ic orderin g numbe r : ena0818a
LV8280T no.a0818-2/8 allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit power supply voltage v cc 4.5 to 5.5 v motor power supply voltage vs 0 to v cc v predriver voltage (gate voltage) vg vs+3.5 to 9.5 v electrical characteristics at ta = 25c, v cc = 5v parameter symbol conditions min typ max unit current drain 1 i cc 1 s/s pin : high level 3.0 4.1 6.0 ma current drain 2 i cc 2 s/s pin : low level(standby mode) 20 a charge pump output output voltage vcp 9.1 9.5 9.9 v internal oscillation circuit internal oscillation frequency f clk 3.0 3.2 3.4 mhz output block source 1 ron (h1) i o = 0.5a, vs = 5v, vg = 9.5v, forward transistor 0.25 0.5 sink ron (l) i o = 0.5a, vs = 5v, vg = 9.5v 0.25 0.5 source+sink ron (h+l) i o = 0.5a, vs = 5v, vg = 9.5v 0.5 1.0 position detector comparator input offset voltage vofs *design target value -10 10 mv control vcref input voltage range vcref 1.65 v vctl input voltage range vctl vcref = 1.65v 0 v cc v current control circuit forward drive gain gdf + 0.20 0.25 0.30 fold reverse drive gain gdf - -0.30 -0.25 -0.20 fold dead zone width vdz vcref = 1.65v 100 150 200 mv limiter voltage vrf 0.18 0.20 0.22 v vco pin vco high-level voltage vcoh 0.8 1.0 1.2 v vco low-level voltage vcol 0.3 0.5 0.7 v s/s pin high-level input voltage range ssh start 2.7 v cc v low-level input voltage range ssl stop 0 0.6 v break sel pin high-level input voltage range brh short-circuit braking 2.7 v cc v low-level input voltage range brl reverse torque braking 0 0.6 v fg output pin output saturation voltage fgsat i o = 0.5ma 0.5 v thermal protection circuit thermal shutdown operating temperature ttsd *design target value 150 180 c thermal shutdown temperature hysteresis ttsd *design target value 40 c *design target value and no measurement is performed.
LV8280T no.a0818-3/8 package dimensions unit : mm (typ) 3259 pin assignment block diagram sanyo : tssop30(275mil) 7.6 5.6 0.65 (1.0) 9.75 0.5 0.15 1 15 30 16 0.22 (0.33) 0.08 1.2max 0 0.6 0.40 0.24 0.40 0.3 0.9 ? 10 80 60 40 20 010 0 ambient temperature, ta ? c allowable power dissipation, pd max ? w pd max ? ta specified circuit board : 76.1 114.3 1.6mm 3 glass epoxy board 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 LV8280T cpc cp vs rf nc uout nc vout nc wout rf pgnd vs com fg1 vg v cc vcref vctl vco rmax rmin vcoin gnd gnd s/s brk comi fil fg3 + + + - + - + - + - vref vco v cc vctl vcref rf wout vout uout vs vg cp1 cpc1 fil vco rmax rmin vcoin comin com fg brk s/s osc charge pump wave synthesizer phase comparator tsd sensorless logic commutation logic
LV8280T no.a0818-4/8 pin functions pin no. pin name pin description equivalent circuit 1 vg charge pump step-up voltage output. insert a capacitor between this pin and ground. 30 cpc charge pump step-up pin. insert a capacitor between this pin and cp (pin 29). 2 v cc small-signal system power supply. insert a capacitor between this pin and ground 3 vcref speed control reference voltage input 4 vctl spindle speed control 5 vco vco oscillator. insert a capacitor between this pin and ground. vco oscillation frequency changes with the spindle motor rotational speed. 6 rmax vco highest frequency setting. insert a resistor between this pin and ground. making the value of the resistor smaller increases the frequency. set the frequency so that the vco oscillator frequency when the vcoin pin voltage is v cc - 1 v is over 96 times the switching frequency at the maximum motor speed. 7 rmin vco lowest frequency setting. reducing the value of the connected resistor increases the frequency. continued on next page. v cc 1 30 50 3 v cc 4 300 300 v cc 5 500 500 500 6 7 500 500 v cc
LV8280T no.a0818-5/8 continued from preceding page. pin no. pin name pin description equivalent circuit 8 vcoin vco control voltage input. insert a capacitor between this pin and ground. 9 10 gnd small-signal system ground. 11 s/s spindle motor start/stop control. apply a high level for the start state. 12 brk spindle motor braking type switching control low level: reverse torque braking. high level: short-circuit braking. 13 comin motor position detection comparator input. insert a capacitor between this pin and fil (pin 14). 14 fil motor position detection comparator input. insert a capacitor between this pin and comin (pin 13). 17 com spindle motor com point connection. 15 fg3 fg3 pulse output. outputs a pulse signal equivalent to a three hall sensor system pulse output. open-drain output. 16 fg1 fg1 pulse output. outputs a pulse signal equivalent to a one hall sensor system pulse output. open- drain output. 18 28 vs spindle motor drive power supply. insert a capacitor between this pin and ground. 21 23 25 wout vout uout outputs. connect these pins to the motor coils. 20 27 rf output current detection. the drive current is detected using a small resistor inserted between this pin and ground. 19 pgnd large signal system ground. 22 24, 26 nc not connected continued on next page. 8 1k 1k v cc v cc 10k 50k v cc vg 13 14 17 600 600 12k 6k 6k 25 18 28 v cc 23 21 27 20
LV8280T no.a0818-6/8 continued from preceding page. pin no. pin name pin description equivalent circuit 29 cp charge pump step-up pulse output. insert a capacitor between this pin and cpc pin (pin 30). LV8280T functional description and notes on external components this document presents information necessary to design syst ems with the best possible char acteristics and should be read before designing driver circuits using the LV8280T. 1. output drive circuits and speed control methods the LV8280T adopts a synchronous commutation direct pwm drive method to minimize power loss in the output. low on-resistance dmos devices are used as the output transistors. (the upper and lower side output block device on-resistance is 0.5 (typical).) the LV8280T spindle drivers control system takes an analog input and uses a v-type control amplifier. the v-type control amplifier based speed control system (gain : 0.25typical) controls the speed by controlling the voltage of the vctl pin (pin 4) and the vcref pin (pin 3). the circuit provides positive torque when vctl is greater than vcref, and allows the application to select either revers e torque braking (when the brk pin is low) or shortcircuit braking (when the brk pin is high) when vctl is less than vcref. the pwm frequency is twice the frequency of the charge pump pulse rate (pin 29). 2. soft switching circuit this ic performs ?soft switching?, which is a technique that varies the duty and achieves quieter motor operation by reducing the level of motor drive noise. this ic provides a ?current application on/off dual sided soft switching? type soft switching function. 3. current limiter circuit the current limiter circuit current limit value is determined by rf in the equation i = vrf/rf (here, vrf = 0.20v, typical). the current limiter circuit detects the rf pin (pins 20 and 27) peak current and turns the sink side transistor off. this ic provides two rf pins, which are connected to the same circuit components internally. however, we recommend that these pins be shorted externally to provide the highest drive efficiency. (the vs pins should be handled in the same manner.) 4. notes on vco circuit constant determination the LV8280T spindle block adopts a sensorless drive method . in sensorless drive, the ic uses the vco signal to control the timing and other aspects so that it can determine the timing with which it applies power to the motor by detecting the back emf signal generated by the motor. we recommend the following procedure to determine the vco circuit external component values. 1) connect external components with recommended and provisional values. connect a capacitor with th e recommended value (3300pf) between the vco pin (pin 5) and ground, connect a capacitor with the provisional value (1 f) between the vcoin pin (pin 8) and ground, connect a 220k resistor between the rmin pin (pin 7) and ground, and connect a 68k resistor between the rmax pin (pin 6) and ground. 2) determine the optimal value of the resi stor connected to the rmin pin (pin 7). the rmin pin resistor determines the startup frequenc y (the vco oscillator frequency when the vcoin voltage is 0v). select a value for this resistor that achieves the shortest possible startup time (the time until the target speed is reached) and that also minimizes the va riations in the startup time. if th e resistor value is increased, the startup frequency will be reduced, and if the resistor value reduced, the startup frequency will be increased. if the startup frequency is too low, the variations in the startup tim e will be increased, and if the value is too large, the motor may idle without engaging. since the optimal value of the rmin pin resistor depends on the characteristics of the motor and the startup current, this value must be checked if a different motor is used or if the circuit sp ecifications are changed. v cc 29
LV8280T no.a0818-7/8 3) determine the optimal resistance of the rmax pin (pin 6) resistor. the dynamic range of the vcoin pin voltage is set by the value of the resistor connected to the rmax pin. with the motor running at the maximum operating speed, sel ect a resistance that brings the vcoin pin voltage to about v cc ? 1.1 (v) (or lower). if the resistance is too large, the vcoin pin voltage may rise. 4) determine the optimal capacitance of the vcoin pin (pin 8) capacitor. with the motor running at the minimum operating speed, increase the value of the vc oin capacitor if the fg output (pins 15 and 16) pulse signal is unstable. 5. s/s circuits the s/s pin (pin 11) is the start/stop pin; a high level select s the start (operate) state. set the s/s pin to the low level to put the ic in full standby state (power saving mode). 6. brk circuit the brk pin (pin 12) switches between reverse torque and short-circuit braking; a high level selects short-circuit braking and a low level selects reverse torque breaking. when the motor speed becomes adequately slow in the reverse torque braking state, the application must switch to the short-circuit braking state to stop the motor. (note: the ic must not be in the power saving state at this point.) when stopping the motor in the state where the control voltage, vctl, is less than vcref (when a low level is input to the brk pin), if the timing of the sw itch to short-circuit braking is too early, and remaining motor rotation is a problem, reduce the value of the rmax pin (pin 14) resistor. also, if motor oscillation continues when the motor is nearly stopped, and a switch to short braking mode does not occur, insert a resistor with a value of a few k at the com pin. (note: verify that inserting this resistor does not adversely affect the startup characteristics.) 7. fg output circuit the fg3 pin (pin 15) is the spindle block fg output pin. it provides a pulse signal equivalent to that provided by systems that use three hall-effect sensors. the fg1 pin (pin 16) outputs a signal that follows the spindle output u phase back emf voltage. the fg1 and fg3 pins both have a mos open-drain output circuit structure. 8. spindle block position sensor comparator circuit the spindle block position sensor comparator circuit uses the back emf signal generated by motor rotation to detect the rotor position. the output block power application timi ng is determined based on the position information acquired by this circuit. startup problems due to noise on the comparator inputs can be ameliorated by inserting a capacitor (1000 to 4700pf) between the comin pin (pin 13) and the fil pin (pin 14). 9. charge pump circuit since the LV8280T has a dmos (n-channel) output structure, it includes a charge pump based voltage step up circuit. when capacitors (recommended value : 0.22 f or higher) are connected between the cp and cpc pins, the ic generates a level that is twice the v cc voltage (or 9.5v). it is desirable that this ic be used with the voltage relationship between the stepped-up voltage (vg) and the motor supply voltage (vs) meeting the condition vg ? vs 3.5v. note that the stepped-up voltage (vg) is, by design, clamped at about 9.5v dc. if the stepped-up voltage (vg) exceeds 10v (vg max) due to ripple, the value of the vg pin capacitor must be increased. observe the following points if the vg voltage is supplied externally. 1) the externally applied vg voltage must no t exceed vgmax in the absolute maximum ratings. 2) the capacitor between the cp and cpc pins (pins 5 and 6) is not required. 3) the sequence in which the vg voltage is applied re quires care. the vg voltage must be applied after v cc , and must be removed before v cc is cut. 4) since there is an internal diode between the v cc and vg pins in the ic, a voltage such that v cc > vg must never be applied to the vg pin. 10. notes on pcb pattern design the LV8280T is a system driver ic fa bricated in a bi-dcmos process, and includes bipolar circuits, mos logic circuits, and mos driver circuits on the same chip. th is means that pattern routin g and sneak currents must be considered during application circuit design. 1) ground and v cc /vs lines the LV8280T ground and power supply pins are classified as follows. small-signal system ground pins gnd (pins 9 and 10) large-signal system ground pins pgnd (pin 19) continued on next page.
LV8280T ps no.a0818-8/8 continued from preceding page. small-signal system power supply pins v cc (pin 2) large-signal system power supply pins vs (pins 18 and 28) capacitors must be inserted between the small-signal system power supply pin (pin 2) and ground pins (pins 9 and 10). locate these capacitors as close to the ic as possible. the large-signal system ground (pgnd) pins must not have any shared impedances with the small-signal system ground lines. the large-signal system power supply (vs) pins must also be connected with the shortest distances possible, and capacitors must be inse rted between these pins and the corresp onding large-signal system ground pin. locate these capacitors as close to the ic as possible. 2) location of small-signal system external components of the small-signal system external components, those th at are connected to ground must be connected to the small-signal system ground with the shortest possible lines. sample application circuit sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probabi lity. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. this catalog provides information as of may, 2007. specifications and inform ation herein are subject to change without notice. 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 LV8280T cpc cp vs rf nc uout nc vout nc wout rf pgnd vs com fg1 vg v cc vcref vctl vco rmax rmin vcoin gnd gnd s/s brk comi fil fg3 + + to dsp to dsp to dsp power supply to dsp to dsp power supply to dsp
|
