31407 ti pc b8-6247, b8-6569 no.7894-1/9 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 LB8649W overview the LB8649W integrates the act uator drivers required by digital cameras on a single chip. features ? integrates the actuator drivers required by digital cameras on a single chip. 1. shutter drive ("sh") /ae system constant current output stepping motor or two vcm drivers 2. zoom system constant voltage output stepping motor or dc motor driver (forward/reverse/brake) 3. af system constant voltage output stepping motor driver ? zero standby mode current consumption (allows batteries to be connected directly) ? four independent power supply systems (sh/ae, af, zoom, and input logic systems) ? low-voltage drive (allows operation from two nimh batteries) ? built-in thermal protection circuit specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit vb max vb power supply 10.5 v maximum supply voltage v cc max v cc power supply 10.5 v maximum input voltage v in max 10.5 v maximum output voltage v out max 10.5 v maximum output current i o max per channel 600 ma allowable power dissipation pd max when mounted on a circuit board *1 1.0 w operating temperature topr -20 to +80 c storage temperature tstg -55 to +150 c *1 specified circuit board : 76.1 114.3 1.6mm 3 , glass epoxy. monolithic digital ic digital camera motor driver orderin g numbe r : en7894b stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
LB8649W no.7894-2/9 allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit vb1, 2, 3 *2 1.9 to 10 supply voltage range v cc 1.9 to 10 v high-level input pin voltage v in h 1.8 to 10 v low-level input pin 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 i iae, ish 0.1 to 1.0 v *2 there are no restraints on the relative magnitudes of the vb1, vb2, v dd , v cc , and v in power supply system voltages. example 1 : vb1 = vb2 = v dd = 2.4v (battery power supply), v cc = 4v (stepped up power supply), v in (cpu power supply) = 5v example 2 : vb1 = vb2 = 2.4v, v in = 3.3 v, v dd = v cc = 5v electrical characteristics at ta = 25 c, vb = v cc = 2.4v, rf = 1 ratings parameter symbol conditions min typ max unit standby mode current consumption i cc 0 vb1 = vb2 = v cc = v dd = 8.0v *3 0.1 5.0 a i cc 1 in1, in2, in3 or in4 = high *3 6 9 i cc 2 in5, in6, in7 or in8 = high *3 14 19 operating mode current consumption i cc 3 in9, in10, in11 or in12 = high *3 18 25 ma vref1 iref = -1ma, inhd = low 0.95 1.0 1.05 reference voltage vref2 iref = -1ma, inhd = high 0.64 0.67 0.70 v control pin input current i in v in = 5.0v 60 90 a thermal shutdown operating temperature tsd design guarantee *4 160 180 200 c af system constant voltage stepping motor driver (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 (high and low side total) 0.27 0.37 0.50 v zoom system constant voltage driver (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 (high and low side total) 0.27 0.37 0.50 v sh/ae system constant current driver (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 (high and low side total) 0.33 0.44 0.60 v *3 : this is stipulated to be the sum of the current consumption for the vb1, vb2, v dd , and v cc lines. *4 : the device characteristics are not tested at all temperatures . they are only tested at ta = 25c at shipment; the characte ristics in the guaranteed temperature range are design guarantees.
LB8649W no.7894-3/9 package dimensions unit : mm (typ) 3163b pin assignment note : both pgnds must be connected. v dd : power supply for the input system, reference voltage, and logic blocks. v cc : power supply for the constant current control block and output blocks (out9, 10, 11, and 12) vb1 : power supply for the constant voltage contro l block and output blocks (out1, 2, 3, and 4) vb2 : power supply for the constant voltage control block and output blocks (out5, 6, 7, and 8) 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 in1 in2 in3 in4 in5 in6 in7 in8 in9 in10 in11 in12 inhd sgnd ( nc ) v dd fc2 fc1 ( nc ) v cc vb2 ( nc ) pgnd out8 rfg2 out12 out5 out6 out7 out11 out10 out2 out3 out4 out9 rfg1 out1 pgnd ( nc ) vb1 v cc vref vc1 vc2 ish iae ( nc ) ( nc ) LB8649W to p view ilb0159 sanyo : sqfp48(7x7) 7.0 7.0 9.0 9.0 0.15 0.5 (1.5) 0.1 1.7max 0.18 0.5 (0.75) 112 13 24 25 36 37 48 0 0.8 1.0 0.4 0.2 0.6 1.2 ? 20 80 60 20 40 010 0 0.56 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
LB8649W no.7894-4/9 truth table (1) af system stepping motor constant voltage control input output in1 in2 in3 in4 inhd out1 out2 out3 out4 vref mode low low low low low ? ? ? ? ? standby high low low low high low ? ? high low high low high low high low low low high low ? ? high low low high high low low high high low low high low low low high ? ? low high low high low high low high low low low high - - low high high low low high high low low high 1-2 phase excitation high high * * ? ? * * high high low ? ? 1.0v output off low 1.0v * * * * high 0.67v notes 1. " ? " indicates the output off state. 2. when the output is high, a level that is vc1 5.1 will be output. (2) zoom stepping motor constant voltage control, or dc motor drive input output in5 in6 in7 in8 inhd out5 out6 out7 out8 vref mode low low low low low ? ? ? ? ? standby high low low low high low ? ? high low high low high low high low low low high low ? ? high low low high high low low high high low low high low low low high ? ? low high low high low high low high low low low high - - low high high low low high high low low high 1-2 phase excitation high high * * high high * * high high low high high 1.0v brake low 1.0v * * * * high 0.67v notes 1. " ? " indicates the output off state, "*" indicates "don't care". 2. when the output is high, a level that is vc2 5.1 will be output.
LB8649W no.7894-5/9 (3) sh/ae system vcm driver constant current control or stepping motor drive input output in9 in10 in11 in12 inhd out9 out10 out11 out12 vref ish mode low low low low ? ? ? ? ? ? standby high low * * high low low high * * low high * * high low high low * * low high low low high 1.0v sh & ae high low * * high low low high * * low high * * high low high low * * low high low high setting voltage state hold low low low low high ? ? ? ? 0.67v discharged standby notes 1. " ? " indicates the output off state, "*" indicates "don't care". 2. out9 and out10 are for sh, and provide st able startup characteristics with fast charge and fast discharge circuits. 3. out10 and out11 are for ae. 4. in standby mode, the ish pin voltage is discharged by an internal transistor and thus is set to 0v. 5. furthermore, the ish pin is also set to the discharged stat e when inputs are provided to in1 through in8. this is for startu p correction. 6. when inhd is low, the vref vol tage will be 1.0v, and when high , the vref voltage will be 0.67v. notes on application design (1) constant current level setting (ish , iae, rfg1/2, and out9 to out12) the constant current level for the out9/10 pair is set by th e ish input voltage and the resi stor connected to rfg1. as shown in the block diagram, the current is controlled so that the voltage generated across the current detection resistor connected between rfg1 and ground and the ish input voltage become equal. the output current can be determined from the following equation. (output current between out9 and out10) = (ish input voltage) (rfg1 resistance + 0.05 ) the 0.05 here is the shared impedance of the emitter of the outp ut transistor that drives the constant current and the constant current control amplifier's sensing line. similarly, the constant current level for the out11/12 pair is set by the iae input voltage and the resistor connected to rfg2. note that since the constant current control block is connected to pgnd internally to the ic, if voltage is provided to ish and iae through a voltage divider, the voltage divider resistor ground must be connected to pgnd. (2) rapid charge and discharge circuits (fc1, out9, and out10) the sh control block (out9/10) includes rapid charge and rapid discharge circuits to support burst (rapid sequential) imaging. since this type of circuit is not included in the ae control block (out11/12), the out9/10 block must be used for shutter drive.
LB8649W no.7894-6/9 (3) startup correction function (ish, out9, and out10) coil current ish discharge when v cc is high (no ish capacitor) when v cc is low (no ish capacitor) sh close operation startup correction coil current startup correction coil current startup correction is applied to the coil waveform by setting the ish pin input voltage to a time constant larger than that of the coil with an external rc circuit. this makes it possibl e to provide stable shutter operation even in the presence of power supply fluctuations. note : for the ish startup correction, the capacitance is determined by, in the state wh ere the ish capacitor is not present, verifying the coil current startup waveform when v cc is at a reduced level and choosing a capacitance such that the time constant is lo wer than that of this waveform. note, however, that in case s where, for example, the supply voltage is stabilized and a startup correction function is not needed, this startup correction capacitor is not needed. (4) phase correction ca pacitor (fc1, fc2) consider values in the range 0.0015 to 0.033f for the fc1/2 capacitors, and select values such that oscillation in the output is not a problem. if a coil with a particularly high impedance is used, an adequate margin must be provided in the capacitor value. note that since the cons tant current control block is connected to pgnd internally to the ic, the ground sides of the fc1/2 capacitors must be connected to pgnd. notes to determine the value of fc1 and fc2 capacitors fc1 is the connection for the phase compensation capacitor for the out9/10 output constant current control circuit. similarly, fc2 is the connection for the out11/12 phase compensation capacitor. to determine the value of thes e capacitors, observe the output waveform and se lect a value such that the output does not oscillate. the fc pin is connected in the ic circuit to the constant current control amplifier output blocs and the output transistor is driven by the rise in the fc potential. therefore, sin ce the fc pin initial state influences the output drive timing, before applying power to the shutter, this ic discharges (with the rapid discharge circuit) the fc pin to a certain fixed potential internally and then when starting to apply power to the shutter, the ic charges (with the rapid charge circuit) the fc pin to a fixed potential internally so that the fc pin state is always fixed when driving the shutter. this stabilizes the input to output delay time. however, if the capacitor value is made too large, the time re quired for the above circuit to charge and discharge that capacitor will become longer and the input to output delay time fluctuations will become larger due to variations in the capacitor value (due both to sample-to-sample variations and to temperature characteristics). another disadvantage of making this capacitor larger is that the coil current rising slope will become less steep. although the rising slope of the coil current is essentially determined by the inductance component of the coil, if the capacitor is made larger and its time constant increases, the slope of the rise of the coil current will become dependent on the capacitor value. for the above reasons, especially if high -speed shutter drive is required, the valu e of the capacitor connected to the fc pin should as small as possible as long as the output does not oscillate (the range roughly from 0.0015 to 0.033 f).
LB8649W no.7894-7/9 (5) constant voltage control: oscillation stopping capacitors (out1 to out8) if constant voltage control is used, capacitors must be conn ected across the outputs to stop oscillation. consider values in the range 0.01 to 0.1f and select capacitor values such that oscillation in the output is not a problem. note that if the output is driven at saturation, these oscillator prevention capacitors are not required. (6) ground and power supply line capacitors (pgnd, sgnd, v cc , vb1, vb2, v dd ) capacitors must be inserted between pgnd (two locations) and sgnd and each of the power supply pins. these capacitors must be positioned as close as possible to the ic. (7) input pin equivalent circuits in1 to in12, inhd pins iae pin ish pin in pins logic vc1, vc2 pins vc pins 1 a or less 1 a or less 1 a or less iae pin ish pin startup correction control circuit 80k
LB8649W no.7894-8/9 block diagram 0.01 to 0.1 f 0.01 to 0.1 f 0.01 to 0.1 f 0.01 to 0.1 f braking function included logic block reference voltage thermal protection circuit constant current output rapid charge/ discharge circuit phase correction capacitor internal impedance 0.0015 to 0.033 f 0.0015 to 0.033 f oscillation stopping capacitor constant voltage output constant current startup setting capacitor
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