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792 motor driver ics spindle and loading motor driver for pd BA6852fp the BA6852fp is a motor driver ic developed for use in pd, cd-rom and dvd applications. in addition to having a conventional spindle motor driver, it includes a reversible motor driver for use with loading motors to allow easy system construction. applications pd, cd-rom and dvd. features 1) power save circuit (three-level switch) allows fg out- put in power save mode. 2) fgsw allows selection between either three-phase composite output or single-phase output for the fg output. 3) the output voltage for the loading motor driver can be set using the vref pin. absolute maximum ratings (ta = 25 c) recommended operating conditions (ta = 25 c)
793 motor driver ics BA6852fp block diagram
794 motor driver ics BA6852fp pin descriptions
795 motor driver ics BA6852fp electrical characteristics (unless otherwise noted, ta = 25 c, v cc = 5v, v m1 = 12v, and v m2 = 12v)
796 motor driver ics BA6852fp measurement circuits (1) measurement circuit resistance (2) input / output table note: forward e c < e cr reverse e c > e cr input voltage h = 2.6v m = 2.5v l = 2.4v
797 motor driver ics BA6852fp (3) measurement circuits i cc1 : ammeter a1 value ips1 = 150 m a h 1 , h 2 , h 3 = v c c / 2 (v) h 1 , h 2 , h 3 = v cc /2 0.1 (v) i cc2 : ammeter a1 value ps = open h 1 , h 2 , h 3 = v cc / 2 (v) h 1 , h 2 , h 3 = v cc /2 0.1 (v) i cc3 : ammeter a1 value ips3 = 150 m a h 1 , h 2 , h 3 = v cc / 2 (v) h 1 , h 2 , h 3 = v cc /2 0.1 (v) i pson : ips range for which all output pins are open (input conditions 1 to 6) i psop : ips range for only fg and the hall bias operate (input conditions 1 to 6) i psoff : ps range for which the output pins are as in the input / output table (input conditions 1 to 6)
798 motor driver ics BA6852fp v hb : voltmeter v1value vps = 5v ihb = 10ma i tl : (voltmeter v2value) / 0.5 vps = 5v e c = 0v (input conditions 1 to 6) i ha : with hn = 4.0v, hn = 2.5v, the current that flows into hn with hn = 2.5v, hn = 4.0v, the current that flows into hn (n = 1, 2, 3) v har : hall input voltage range for which the output pin is as per the input / output table. v inh : hall input level for which the output pin is as per the input / output table. | hn hn l hin = 2.5v
799 motor driver ics BA6852fp e c , e cr : torque command operation voltage range e cof : vary e c until e cr = 2.5v, then vary e c voltmeter v1 < 3mv. this e c voltage range (see operation notes (2)). e cin : ammeter value when e c = 2v and e cr = 2.5v g ec : if the v1 value is v2 when e c = 1.5v, and the v1 value is v3 when e c = 2.0v g ec = {(v2 v3) / (2.0 1.5)} / r nf (r nf = 0.5 w ) v sbon : brk pin voltage range when all output pins are low. v sboff : brk pin voltage range when all output pins are as per the input / output table.
800 motor driver ics BA6852fp v swl : fgsw pin voltage range when the hall input and fg output are as per the table below. v fgh : voltmeter v1 value (input / output table, condition 2) ifg = 10 m a fgsw = 0v v fgl : voltmeter v1 value (input / output table, condition 1) ifg = 3ma fgsw = 0v v swh : fgsw pin voltage range when the hall input and fg output are as per the table below.
801 motor driver ics BA6852fp v oh : with the output measurement pin made high level according to the input conditions, the v1 value when 600ma flows from that pin. v ol : with the output measurement pin made low level according to the input conditions, the v2 value when 600ma flows from that pin. v hys : the voltage difference v3 between h 1 and h 1 that switch the fg pin. e c = 2.5v fgsw = 0v i vmd : ammeter a1value output open (input conditions 1 to 6) e c = 0v
802 motor driver ics BA6852fp i cc4 : ammeter a1 value in1 = 5v, in2 = 0v i cc5 : ammeter a1 value in1 = 5v, in2 = 5v v ih : in1 range for which out1 = high, out2 = low (in2 = low) in2 range for which out1 = low, out2 = high (in1 = low) v il : in1 range for which out1 = low, out2 = high (in2 = high) in2 range for which out1 = high, out2 = low (in1 = high) i ih : ammeter a2 value when in1 = 2v ammeter a3 value when in2 = 2v v ce : sum of v1 (the value when 200ma is flowing from the output high level pin) and v2 (the value when 200ma is flowing to the output low level pin).
803 motor driver ics BA6852fp operation notes (1) torque command the r nf pin voltage with respect to the torque command input (ec) is as follows. i ref : ammeter a1 value i o = 100ma v ref = 9v v ref :v ref pin voltage range for which the output voltage can be controlled the i / o gain g ec from the e c pin to the r nf (output current) is determined by the r nf detector resis- tance. g ec = 0.25 / r nf (a / v) the torque limit current i tl is given by i tl = 0.35 / r nf (a).
804 motor driver ics BA6852fp (2) power save the power save pin logic is as follows. (3) reverse rotation detector the construction of the reverse rotation detector circuit is shown in fig. 17. motor operation during reverse detection when e c < e cr , forward rotation (right rotation) when e c > e cr , reverse torque is applied to reduce speed (right rotation) when the motor reverses, the reverse rotation detector operates, and the coil output is opened. free rotation in the reverse direction by inertia. stop ( 1) forward (e c < e cr ) the phase relationship between the hall input sig- nals h 2 and h 3 is as shown in fig.18, and the re- verse rotation detector circuit does not operate. ( 2) reverse (e c > e cr ) the phase relationship between h 2 and h 3 is opposite to that for forward rotation, and the re- verse rotation detector circuit operates to switch the output off and leave it in the open state.
805 motor driver ics BA6852fp (4) input / output timing chart (forward rotation)
806 motor driver ics BA6852fp (5) short brake when the brk pin goes to high level, the upper-side output transistors (three phase) go off, and the lower-side output transistors (three phase) go on. (6) hall input the hall pins can be connected in series or parallel.
807 motor driver ics BA6852fp (7) fg output switch the relationship between the fg output switch pin and the fg output is as follows. (8) about the input pin applied voltage do not apply voltage to any of the other pins when the v cc voltage is not being supplied to the ic. in addition, when v cc is being applied, do not apply a voltage more than v cc to any of the other pins. (9) input pins the loading input pin has a negative temperature charac- teristic, so when using it, give due consideration to the temperature characteristics. (10) v ref pin (output high level voltage setting) the loading block output high level voltage can be set us- ing the v ref pin voltage. the output high level voltage v oh is given by the following formula. v oh = v ref i ref r1 vbe (q1) vbe (q3) the v ref voltage that brings about the above formula is up to v m2 v ce (q2) vbe (q3). do not apply a voltage of more than v m2 to the v ref pin. short the v ref pin to v m2 if you will not use it.
808 motor driver ics BA6852fp (11) spindle and loading operation conditions when in1 or in2 are high level, the spindle is off regardless of the ps pin input. (12) driver section ground (gnd) pgnd (pin 14) is the driver section gnd, and is not con- nected to the signal section gnd. this is the motor cur- rent path, so take care with the pcb track width and ar- rangement on the pc board. (13) thermal shutdown (tsd) when the junction temperature reaches 175 c (typ.), the motor output is opened. there is approximately 15 c (typ.) of temperature hysteresis. electrical characteristics curves
external dimensions (units: mm) 809 motor driver ics BA6852fp

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