82504 jo im no.7893-1/9 LB8649FN feature ? actuator drivers for digital cameras embedded in one chip. 1. constant current output car stepping motor for sh/ae or vcm 2 2. constant voltage output car stepping motor for zoom or dc motor driver (normal rotation/reverse rotation/brake) 3. constant voltage output car stepping motor for af ? no standby current consumption (or zero). (direct battery connection possible.) ? 4 systems for independent power supply (sh/ae, af, zoom or input logic system) ? low voltage driving (driving by two nickel hydride batteries possible) ? built-in thermal protection circuitry absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit vb max vb power supply 10.5 max. power source voltage v cc max v cc power supply 10.5 v max. input applied voltage v in max 10.5 v max. output applied voltage v out max 10.5 v max. output current i o max per ch 600 ma allowable power consumption pd max circuit board mounting (*1) 1.0 w operating temperature topr -20 to +80 c storage temperature tstg -55 to +150 c (*1) mounting circuit board : 50.0mm 50.0mm 0.8mm glass epoxy resin ordering number : enn*7893 monolithic digital ic motor driver for dscs
LB8649FN no.7893-2/9 allowable operating range at ta = 25 c parameter symbol conditions ratings unit vb1, 2, 3 (*2) 1.9 to 10 source voltage range v cc 1.9 to 10 v input pin ?h? voltage v in h 1.8 to 10 v input pin ?l? voltage v in l -0.3 to 0.4 v constant voltage setting input range voc vc1, vc2 0.1 to vb v constant current setting input range v o 1 iae, ish 0.1 to 1.0 v (*2) there is no priority on each power supply ; vb1, 2, v dd , v cc and v in . example1 : vb1 = vb2 = v dd = 2.4v (battery power supply), v cc = 4v (step-up power supply), v in (cpu power supply) = 5v example2 : vb1 = vb2 = 2.4v, v in = 3.3v, v dd = v cc = 5v electrical characteristics at ta = 25 c, vb1 = vb2 = v dd = v cc = 2.4v, rf = 1 ? ratings parameter symbol conditions min typ max unit standby current consumption i cc 0 vb1 = vb2 = v dd = v cc = 8.0v (*3) 0.1 5.0 a i cc 1 in1 or in2 or in3 or in4 = h (*3) 6 9 i cc 2 in5 or in6 or in7 or in8 = h (*3) 14 19 operating current consumption i cc 3 in9 or in10 or in11 or in12 = h (*3) 18 25 ma vref1 iref = -1ma, inhd = l 0.95 1.0 1.05 reference voltage vref2 iref = -1ma, inhd = h 0.64 0.67 0.70 v control pin input current i in v in = 5.0v 60 90 a overheat protection detection temperature thd design guaranteed (*4) 160 180 200 c [constant voltage stepping motor dr iver for af] (out1, 2, 3, 4) output constant voltage 1 v o 1 vc1 = 0.30v 1.46 1.53 1.60 v output saturation voltage 1 vsat1 i o = 0.2a (upper and lower) 0.27 0.37 0.50 v [constant voltage driver for zoom] (out5, 6, 7, 8) output constant voltage 2 v o 2 vc2 = 0.30v 1.46 1.53 1.60 v output saturation voltage 2 vsat2 i o = 0.2a (upper and lower) 0.27 0.37 0.50 v [constant current driver for sh/ae] (out9, 10, 11, 12) output constant current i o rf = 1 ? , ish = 0.3v 271 285 302 ma output saturation voltage 3 vsat3 i o = 0.3a (upper and lower) 0.33 0.44 0.60 v (*3) measures by summation of current dissipation for each line of vb1, vb2, v dd and v cc . (*4) for the characteristic within the guaranteed temper ature range, shipment check is performed at ta = 25 c. for all temperature range, it is design guaranteed.
LB8649FN no.7893-3/9 package dimensions unit : mm 3272 pin assignment (note) pgnd is connected with both 2 pins. v dd : input, reference voltage, logic power supply v cc : constant current control part, output (out9, 10, 11, 12) part power supply vb1 : constant voltage control part, output (out1, 2, 3, 4) part power supply vb2 : constant voltage control part, output (out5, 6, 7, 8) part power supply 8 9 10 11 12 37 38 41 40 42 46 48 47 45 44 43 39 6 7 4 5 2 3 1 20 13 14 15 16 17 18 19 21 22 23 24 35 34 36 25 27 26 28 30 29 31 33 32 in12 in11 in10 in9 in8 in7 in6 in5 in4 in3 in2 in1 (nc) (nc) iae ish vc2 vc1 vref v cc vb1 (nc) pgnd out1 rfg1 out9 out4 out3 out2 out10 out11 out7 out6 out5 out12 rfg2 out8 pgnd (nc) vb2 v cc (nc) fc1 fc2 v dd (nc) sgnd inhd lab8649fn top view ilb01597
LB8649FN no.7893-4/9 truth table 1. stepping motor constant voltage control for af input output in1 in2 in3 in4 inhd out1 out2 out3 out4 vref mode l l l l l - - - - - stand-by h l l l h l - - h l h l h l h l l l h l - - h l l h h l l h h l l h l l l h - - l h l h l h l h l l l h - - l h h l l h h l l h 1-2 phase excitation h h * * - - * * h h l - - 1.0v output off l 1.0v * * * * h 0.67v ? ( - ) is output off. ? when setting output to ?h?, the output voltage is 5.1 times the vc1. 2. stepping motor constant voltage control for zoom or dc motor drive input output in5 in6 in7 in8 inhd out5 out6 out7 out8 vref mode l l l l l - - - - - stand-by h l l l h l - - h l h l h l h l l l h l - - h l l h h l l h h l l h l l l h - - l h l h l h l h l l l h - - l h h l l h h l l h 1-2 phase excitation h h * * h h * * h h l h h 1.0v brake l 1.0v * * * * h 0.67v ? ( - ) is output off, and ( * ) is ?don?t care?. ? when setting output to ?h?, the output voltage is 5.1 times the vc2.
LB8649FN no.7893-5/9 3. vcm constant current control for sh/ae, or stepping motor drive. input output in9 in10 in11 in12 inhd out9 out10 out11 out12 vref ish mode l l l l - - - - - - stand-by h l * * h l l h * * l h * * h l h l * * l h l l h 1.0v sh & ae h l * * h l l h * * l h * * h l h l * * l h l h setting voltage state hold l l l l h - - - - 0.67v discharge stand-by ? ( - ) is output off, and ( * ) is ?don?t care?. ? out9 and out10 are used for the sh. quick charge and quick discharge circuitry allows the stabilization of start-up characteristic. ? out10 and out11 are used for the af. ? at the time of stand-by, ish pin voltage becomes discharge state by the internal transistor and it is set to 0v. ? in addition, when in1 to 8 are input, ish pin is in discharge state (for start-up correction). ? when inhd = ?l?, vref voltage is 1.0v. when inhd = ?h?, vref voltage is 0.67v. application design notes 1. constant current setting (ish, iae, rfg1, 2, out9 to 12) the constant current setting between pi ns out9 and out10 is determined from the ish input voltage and the connecting resistor of rfg1. as shown in the block diagram, it is controlled in such a way so that the voltage generated at the resistor used for current detection connected between rfg1 and gnd would be equal to the ish input voltage. the formula for calculating th e output current is as given below. (out9 to out10 output current) = (ish input voltage) (rfg1 resistor + 0.05 ? ) the 0.05 ? here is for a common impedance of the output tr emitter which drives constant current in the rfg pin and the sensing wiring for the constant current control amplifier. in the same way, the constant current setting between pi ns out11 and out12 is determined from the iae input voltage and the connecting resistor of rfg2. furthermore, as the constant current control block within the ic is connected to pgnd, when supplying voltage to the ish pin or iae pin which has been divided by resistors be sure to connect the ground side of these resistors to pgnd. 2. quick charge/discharge ci rcuitry (fc1, out9, out10) quick discharge circuitry has been built in to the shu tter control block (out9 to out10) to support high-speed shutter control, quick recharge, quick discharge and consecutive shots. quick recharge and quick discharge circuitry has not been built in to the ae control block (out11 to out12). therefore, make sure to use the block (out9 to out10) for the shutter drive.
LB8649FN no.7893-6/9 3. start-up correction function (ish, out9, out10) the ish pin input voltage is set with the decay time constant to be larger than the coil decay time constant by using the external cr and the start-up correctio n occurs with respect to the coil wave. by doing this, stable shutter operation can be carried out with respect to the power supply variations. (note) for the ish pin start-up correction, ch eck the coil current start-up wave for the v cc reduced voltage when there is no ish pin capacitor and choose a capacitance so that the decay time constant is lower than this wave. however, at times such as when the powe r supply voltage is stable or the start-up correction function is not required, such a start-up correction capacitor is not necessary. 4. phase compensation capacitor (fc1, fc2) see and check the capacitor value for fc 1 and fc2 between 0.0015 to 0.033 f. choose a capacitance value which does not cause oscillation problems for output. (in particular, when a coil with large inductance is used, it is necessary to choose a sufficiently large capacitance.) also, as the constant current control block within the ic is connected to pgnd, be sure to connect the ground side of the fc1 pin and fc2 pin capacitor to pgnd. 5. constant voltage control oscillation-stopping capacitor (out1 to 8) when controlling the constant voltages, it is necessary to place capacitors betwee n the out pins to stop oscillation. see and check the capacitor value between 0.01 f to 0.1 f. choose a capacitance value which does not cause oscillation problems for output. when driving at saturation, there is no need for such oscillation-stopping capacitor. 6. gnd wiring and power line capacitors : (pgnd, sgnd, v cc , vb1, 2, v dd ) connect pgnd (2 places) and sgnd near the ic, and place th e capacitors as close as po ssible to each of the power pins.
LB8649FN no.7893-7/9 7. input pin equivalent circuit
LB8649FN no.7893-8/9 block diagram
LB8649FN no.7893-9/9 ps
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