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tb6608fng 2007-12-17 1 toshiba bi ? cd integrat ed circuit silicon monolithic tb6608fng stepping motor driver ic the tb6608fng is a pwm constant-current type stepping motor driver ic designed for sinusoidal-input micro-step control of stepping motors. the tb6608fng can be used in applications that require 2-phase, 1-2-phase, w1-2-phase and 2w1-2 phase excitation modes. the tb6608fng is capable of forward and reverse driving of a 2-phase bipolar stepping motor using only a clock signal. features ? motor power supply voltage: v m = 15 v (max) ? control power supply voltage: v cc = 2.7 to 6 v ? output current: iout 0.8 a (max) ? output on-resistance: ron = 1.5 (upper and lower sum@v m = 5 v) ? decoder that enables microstep control with the clock signal ? selectable phase excitation modes (2, 1-2, w1-2 and 2w1-2) ? internal pull-down resistors on inputs: 200 k (typ.) ? output monitor pin ( mo ) ? thermal shutdown (tsd) and undervoltage lockout (uvlo) circuits ? small surface-mount package (ssop20: 0.65 mm lead pitch) ? this product has a mos structure and is sensitive to electrostatic discharge. when handling this product, ensure that the environment is prot ected against electrostatic discharge by using an earth strap, a conductive mat and an ionizer. ensure also that the ambient temperature and relative humidity are maintained at reasonable levels. ? do not insert devices in the wrong orientation or in correctly. otherwise, it may cause the device breakdown, damage and/or deterioration. weight: 0.09 g (typ.) about solderability, following conditions were confirmed ? solderability (1) use of sn-37pb solder bath solder bath temperature = 230c dipping time = 5 seconds the number of times = once use of r-type flux (2) use of sn-3.0ag-0 .5cu solder bath solder bath temperature = 245c dipping time = 5 seconds the number of times = once use of r-type flux
tb6608fng 2007-12-17 2 block diagram vref voltage setting input tq vref l 0.125 v h 0.5 v decoder for microstep control 2 1-2 w1-2 2w1-2 phase 15 2 stanby 1 16 uvlo 2 v 4 5 7 20 14 19 18 b.g vref 2 switches 0.125 v, 0.5 v 17 3 pre- driver h-bridge a pwm timer osc tsd 13 11 12 pre- driver h-bridge b pwm timer 10 8 9 6 m1 m2 cw/ccw ck reset enable dcy tq osc gnd stby v cc mo a o1 a o2 rfa vm bo1 bo2 rfb
tb6608fng 2007-12-17 3 pin function pin no. symbol functional description remarks 1 v cc power supply pin for logic block v cc (opr) = 2.7 to 5.5 v 2 stby standby input see the input signals and operating modes table. 3 osc connection pin for an external capacitor used for internal oscillation 4 m1 excitation mode setting input 1 see the excitation mode settings table. 5 m2 excitation mode setting input 2 see the excitation mode settings table. 6 v m power supply pin for output v m (opr) = 2.5 to 13.5 v 7 cw/ccw rotation direction select input see the input signals and operating modes table. 8 bo2 b-phase output 2 connect bo2 to a motor coil pin. 9 rfb connection pin for a b-phase output current detection resistor 10 bo1 b-phase output 1 connect bo1 to a motor coil pin. 11 ao2 a-phase output 2 connect ao2 to a motor coil pin. 12 rfa connection pin for an a-phase output current detection resistor 13 ao1 a-phase output 1 connect ao1 to a motor coil pin. 14 reset reset input see the input signal and operating modes table. 15 gnd ground 16 mo monitor output initial state: mo = low (open drain, pulled up by an external resistor) 17 tq vref setting input see the vref voltage setting table. 18 dcy decay setting input see the fast-decay time inserted during the current decay period table. 19 enable enable input see the input signal and operating modes table. 20 ck clock input pin assignment 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 v cc stby osc m1 m2 v m cw/ccw bo2 bo1 rfb ck enable dcy tq mo gnd reset a o1 rfa a o2
tb6608fng 2007-12-17 4 input signals and operation modes inputs ck cw/ccw reset enable stby operating mode l h h h cw h h h h ccw x x l h h initial mode x x x l h enable wait mode (outputs: high impedance) x x x x l standby mode (outputs: high impedance) x: don?t care excitation mode settings inputs m1 m2 excitation mode l l 2-phase h l 1-2-phase l h w1-2-phase h h 2w1-2-phase initial a- and b-phase currents (this table also applies to the currents on exit from standby mode.) excitation mode a-phase current b-phase current 2-phase 100% ? 100% 1-2-phase 100% 0% w1-2-phase 100% 0% 2w1-2-phase 100% 0% in this specification, the direction of current flows from ao 1 to ao2 and from bo1 to bo2 are defined as the forward direction.
tb6608fng 2007-12-17 5 2-phase excitation (m1: l, m2: l, cw mode) 2-phase excitation (m1: l, m2: l, ccw mode) 1-2-phase excitation (m1: h, m2: l, cw mode) 1-2-phase excitation (m1: h, m2: l, ccw mode) ck 0 71 100 (%) ? 71 ? 100 mo i a 0 71 100 (%) ? 71 ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 ck 0 71 100 (%) ? 71 ? 100 mo i a 0 71 100 (%) ? 71 ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 ck 0 100 (%) ? 100 mo i a 0 100 (%) ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 ck 0 100 (%) ? 100 mo i a 0 100 (%) ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7
tb6608fng 2007-12-17 6 w1-2-phase excitation (m1: l, m2: h, cw mode) ck mo 100 (%) 92 71 38 0 ? 38 ? 71 ? 92 ? 100 i a 100 (%) 92 71 38 0 ? 38 ? 71 ? 92 ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 t 16
tb6608fng 2007-12-17 7 w1-2-phase excitation (m1: l, m2: h, ccw mode) ck mo 100 (%) 92 71 38 0 ? 38 ? 71 ? 92 ? 100 i a 100 (%) 92 71 38 0 ? 38 ? 71 ? 92 ? 100 i b t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 t 16
tb6608fng 2007-12-17 8 2w1-2-phase excitation (m1: h, m2: h, cw mode) ck mo 100 (%) 98 92 83 71 56 38 20 0 ? 20 ? 38 ? 56 ? 71 ? 83 ? 92 ? 98 ? 100 100 (%) 98 92 83 71 56 38 20 0 ? 20 ? 38 ? 56 ? 71 ? 83 ? 92 ? 98 ? 100 t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 t 16 t 17 t 18 t 19 t 20 t 21 t 22 t 23 t 24 t 25 t 26 t 27 t 28 t 29 t 30 t 31 t 32 i a i b
tb6608fng 2007-12-17 9 2w1-2-phase excitation (m1: h, m2: h, ccw mode) ck mo 100 (%) 98 92 83 71 56 38 20 0 ? 20 ? 38 ? 56 ? 71 ? 83 ? 92 ? 98 ? 100 100 (%) 98 92 83 71 56 38 20 0 ? 20 ? 38 ? 56 ? 71 ? 83 ? 92 ? 98 ? 100 t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 t 16 t 17 t 18 t 19 t 20 t 21 t 22 t 23 t 24 t 25 t 26 t 27 t 28 t 29 t 30 t 31 t 32 i a i b
tb6608fng 2007-12-17 10 output current vector locus (normalizing a single step to 90 degrees) rotation angle vector length ideal calculated ideal calculated 0 0.00 0.00 100 100.00 ? 1 11.25 11.53 100 100.02 ? 2 22.50 22.44 100 99.54 ? 3 33.75 34.01 100 100.12 ? 4 45.00 45.00 100 100.41 141.42 5 56.25 55.99 100 100.12 ? 6 67.50 67.56 100 99.54 ? 7 78.75 78.47 100 100.02 ? 8 90.00 90.00 100 100.00 ? 1-2-/w1-2-/2w1-2-phase 2-phase 8 0 0 20 38 56 71 83 92 98 100 20 38 56 71 83 92 98 100 i b (%) i a (%) (only when in 2-phase excitation mode) solid line: ideal value broken line: calculated value 7 6 5 4 3 2 1
tb6608fng 2007-12-17 11 relationship between the enable input and the phase current and mo outputs example 1: 1-2-phase excitation (m1: h, m2: l) setting the enable signal low disables only the output signals. on the other hand, internal logic functions continue to operate in accordance with the ck signal. therefore, when the enable signal goes high again, the output current generation is restarted as if phases proceeded with the ck signal. example 2: 2w1-2-phase excitation (m1: h, m2: h) ck mo 100 (%) 98 92 83 71 56 38 20 0 ? 20 ? 38 ? 56 ? 71 ? 83 ? 92 ? 98 ? 100 i a t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 23 t 24 t 25 t 26 t 27 t 28 t 29 t 30 t 31 t 32 enable reset t 33 t 34 off ck mo 0 71 100 (%) ? 71 ? 100 phase current (ao1, ao2) t 0 t 1 t 2 t 3 off t 7 t 8 t 9 t 10 t 11 t 12 enable reset
tb6608fng 2007-12-17 12 relationship between the reset input and the phase current and mo outputs example 1: 1-2-phase excitation (m1: h, m2: l) setting the reset signal low causes the outputs to be put in the initial state and the mo output to be low. (initial state: a-channel output current is at its peak (100%).) when the reset signal goes high again, the output current generation is resumed at the next risi ng edge of the ck signal with the state following the initial state. if reset goes high when ck is already high, th e output current generation is resumed immediately without waiting for the next rising edge of ck with the state follo wing the initial state. example 2: 2w1? 2 phase excitation (m1: h, m2: h) ck mo 100 (%) 98 92 83 71 56 38 20 0 20 38 56 71 83 92 98 100 i a t 0 t 1 t 2 t 3 t 4 t 5 t 6 t 7 t 8 t 9 t 10 t 11 t 8 t 9 t 10 t 11 t 12 t 13 t 14 t 15 t 16 t 17 enable reset t 18 t 19 ck mo 0 71 100 (%) 71 100 phase current (ao1, ao2) t 0 t 1 t 2 t 3 t 3 t 4 t 5 t 6 t 7 t 8 enable reset t 2
tb6608fng 2007-12-17 13 absolute maximum ratings (ta = 25c) characteristics symbol rating unit v cc 6 v power supply voltage v m 15 v iout(ao), iout(bo) 0.8 a output current mo i 1 ma withstand voltage of mo mo v v cc v input voltage v in ? 0.2 to v cc + 0.2 v 0.71 (note 1) power dissipation p d 0.96 (note 2) w operating temperature t opr ? 20 to 85 c storage temperature t stg ? 55 to 150 c note 1: ic only note 2: mounted on a glass epoxy board (50 50 1.6 mm, cu 40%) recommended operating conditions (ta = ? 20 to 85c) characteristics symbol test condition min typ. max unit control power supply voltage v cc (opr) ? 2.7 3.3 5.5 v motor power supply voltage v m (opr) ? 2.5 5 13.5 v output current i out 2.5 v v m 4.8 v ? ? 0.35 a output current i out 4.8 v < v m 13.5 v ? ? 0.6 a input voltage v in ? ? ? v cc v clock frequency fck ? ? 1 10 khz osc frequency fosc ? 80 460 780 khz chopping frequency fchop ? 20 115 195 khz functional descriptions the oscillation frequency of a triangular wave fosc can be calculated as follows: fosc = cosc vosc2 i ? = coscv)0.6v(1.12 a101 ? = 1.1 10 ? 4 cosc 1 (since this is an approximation form ula, the calculation result may differ from the actual value.)
tb6608fng 2007-12-17 14 chopper control turning on the power (chop on) causes a current to flow into the coils. once the v rf voltage reaches vref, it is detected by the comparator and th e power is turned off (chop off). the off timer/counter counts the number of falling edges of the internal ck signal, whic h is derived from the osc signal, and generates the motor-driving pwm signal based on the turn-off time of four ck cycles. the upper limit of the current across the motor coil (i.e., the peak current in each excitation mode), i (limit), can be calculated as follows: i (limit) = vref/r nf vref equals to 0.125 v when tq is low, while it equals to 0.5 v when tq is high. r nf is the value of resistors used for output current dete ction. one of those resistor s is connected between rfa and gnd, and the other is connected between rfb and gnd. timing chart may be simplified for the sake of brevity. internal ck osc off timer counter upper limit: vref/r nf coil current chop on off on off on off on generate pwm
tb6608fng 2007-12-17 15 pwm control in pwm mode, the motor operating mode changes between cw/ccw and short brake alternately. to eliminate shoot-through current th at flows from supply to ground due to the simultaneous conduction of high-side and low-side transistors in the bridge output, a dead time of 200 ns (design target value) is generated in the ic when transistors switch from on to off (t2), or vice versa (t4). this permits a synchronous rectification pwm operat ion without controlling the dead time externally. m v m out2 out1 t1 m v m out2 out1 t2 = 200 ns (typ.) m v m out2 out1 t3 m v m out2 out1 t4 = 200 ns (typ.) m v m out2 out1 t5 v m gnd output voltage waveform (out1) t1 t5 t3 t2 t4
tb6608fng 2007-12-17 16 1. constant-current chopping when v rf reaches the predefined vref voltage, the cons tant-current regulator enters discharge mode. after four cycles of ck, an internal clock generated by osc, the regulator moves from discharge mode to charge mode. v rf vre f internal ck osc vre f v rf discharge charge discharge gnd vre f iout charge discharge charge discharge
tb6608fng 2007-12-17 17 2. changing the predefined current to the lower value during deceleration, the regulator enters fast-decay mode immediately after the end of the current decay slope of slow-decay mode. the distorti on of the current waveform can be reduced by the regenerative current from a coil that flows back to the power supply. two ck cycles later, the regulator exits fast decay mode and enters charge mode. (the fast-decay time, which is sp ecified herein as two ck cycles, varies depending on the mode setting. a detailed description of the mode setti ng is provided in the current decay mode section.) when v rf reaches the reference voltage (vref), the regulator enters discharge mode. four ck cycles later, the regulator exits discharge mode and enters charge mode. if v rf > vref when it enters charge mode, however, it then reenters discharge mode. four ck cycles later, v rf is again compared against vref. if v rf < vref, the regulator remains in charge mode until v rf reaches vref. internal ck osc vre f v rf discharge gnd vre f iout charge charge discharge charge charge slow decay fast decay charge slow decay charge
tb6608fng 2007-12-17 18 in fast-decay mode, the regenerative current from a coil flows back to the power supply as shown below. 3. changing the predefined current to the higher value even when the vref voltage is incre ased, the regulator remains in discharge mode for four ck cycles and then enters charge mode. during acceleration, the current decays only in slow-decay mode. internal ck osc vre f v rf discharge gnd vre f iout charge discharge discharge charge charge discharge m v m out2 out1 (slow decay mode) m v m out2 out1 (fast decay mode)
tb6608fng 2007-12-17 19 setting the current decay mode table fast-decay time inserted during the current decay period (, which is expressed as the number of ck cycles (an actual value may not exactly equal to the specified value).) 2w1-2-phase w1-2-phase 1-2-phase input predefined current number of ck cycles predefined current number of ck cycles predefined current number of ck cycles dcy % tq = h tq = l% tq = htq = l% tq = h tq = l 100 100 100 98 0 0 92 0 0 92 0 0 83 0 0 71 0 0 71 0 0 71 0 0 56 0 0 38 0 0 38 0 0 20 0 0 l 0 0 0 0 0 0 0 0 0 100 100 100 98 2 1 92 2 1 92 2 1 83 2 1 71 2 1 71 4 2 71 4 2 56 4 2 38 4 2 38 4 2 20 4 2 h 0 0 0 0 0 0 0 0 0 if no distortion can be observed in the output current waveform, the dcy pin should be kept high. the distortion reduction depends on the motor characteristics. if any dist ortion can be observed, the dcy pin should be kept low. also, it should be ensured that the dcy input is set high only when the coil of a motor has an inductance of 1.5 mh or higher where fosc is no less than 100 khz. thermal shutdown (tsd) circuit the tb6608fng includes a thermal shutdown circuit, which turns the output transistors off when the junction temperature (t j ) exceeds 160c (typ.). the output transistors are auto matically turned on when t j cools past the shutdown threshold, which is lowered by a hysteresis of 40c. t sd = 160c (design target value) t sd = 40c (design target value) * in thermal shutdown mode, the internal circuitry and ou tputs assume the same states as in enable wait mode. upon exit from thermal shutdown mode, they revert to those states which they assume when taken out of enable wait mode.
tb6608fng 2007-12-17 20 undervoltage lockout (uvlo) circuit the tb6608fng includes an undervoltage lockout circuit, which puts the output transistors in the high-impedance state when v cc decreases to 2.0 v (typ.) or lower. the output transistors are auto matically turned on when v cc increases past the lockout threshold, which is raised to 2.03 v by a hysteresis of 0.03 v. even when uvlo circuit is tripped, internal circuitry co ntinues to operate in accordance with the ck input like when enable is set low. thus, after the tb6608fng exits the uvlo mode, the reset si gnal should be asserted for putting the tb6608fng in the initial state if necessary. electrical characteristics (unless otherwise specified, ta = 25c, v cc = 3.3 v, v m = 5 v, r nf = 2 , c osc = 220 pf.) characteristics symbol te s t circuit test condition min typ. max unit v in (h) (1) 2 ? v cc + 0.2 v v in (l) (1) 1 cw/ccw, ck, reset, enable, m1, m2 (@ v cc = 3.3 v) ? 0.2 ? 0.8 v v in (h) (2) 2.8 ? v cc + 0.2 v v in (l) (2) 1 cw/ccw, ck, reset, enable, m1, m2 (@ v cc = 5.5 v) ? 0.2 ? 0.8 v v in (h) (3) v cc 0.6 ? v cc + 0.2 v input voltage v in (l) (3) 1 stby, tq, dcy ? 0.2 ? v cc 0.15 v input hysteresis voltage v h ? cw/ccw, ck, reset, enable, m1, m2 ? 200 ? mv i inh v in = 3.0 v 5 15 25 a input current i inl 1 v in = gnd ? ? 1 a i cc1 outputs: open, enable: h, reset: h ? 4 6 ma i cc2 enable: l ? 4 6 ma i cc3 standby mode ? 5 10 a i m1 outputs: open, enable: h, reset: h ? 1 2 ma i m2 enable: l ? 0.5 1.0 ma dynamic supply current i m3 2 standby mode ? ? 1 a v rfa (1) , v rfb (1) tq: l, 2-phase excitation 0.1 0.125 0.15 comparator reference voltage v rfa (2) , v rfb (2) 3 tq: h, 2-phase excitation 0.445 0.5 0.555 v channel-to-channel voltage differential v o ? b/a, tq: l ? 11 ? 11 % lower threshold uvld (design target value) ? 2.0 ? v undervoltage lockout threshold at v cc upper threshold uvlc (design target value) ? 2.03 ? v mo output voltage mo v ? mo i = 1 ma ? ? 0.5 v osc frequency f osc ? c osc = 220 pf 300 460 620 khz this table shows which inpu ts are ttl-compatible and which ones are cmos-compa tible. this also shows whether they are provid ed with hysteresis. input pins input level hysteresis cw/ccw, ck, reset, enable, m1, m2 ttl yes stby, tq, dcy cmos no
tb6608fng 2007-12-17 21 output block characteristics symbol te s t circuit test condition min typ. max unit i out = 0.2 a ? 0.3 0.4 output saturation voltage v sat (u + l) 4 i out = 0.6 a ? 0.9 1.2 v v f u ? 1 1.2 diode forward voltage v f l 5 i out = 0.6 a ? 1 1.2 v 2w1-2-phase excitation w1-2-phase excitation 1-2-phase excitation = 0 ? 100 ? 2w1-2-phase excitation ? ? = 1/8 92 98 101 2w1-2-phase excitation w1-2-phase excitation ? = 2/8 86 92 98 2w1-2-phase excitation ? ? = 3/8 77 83 89 2w1-2-phase excitation w1-2-phase excitation 1-2-phase excitation = 4/8 65 71 77 2w1-2-phase excitation ? ? = 5/8 50 56 62 2w1-2-phase excitation w1-2-phase excitation ? = 6/8 32 38 44 2w1-2-phase excitation ? ? vector 3 = 7/8 tq: l r nf = 2 c osc = 220 pf 14 20 26 a-/b-phase chopping current (note) 2-phase excitation ? ? ? 100 ? % t r ? 0.5 ? t f @ load: 5 mh, 50 ? 0.5 ? t plh ? 5 ? t phl ck to output ? 5 ? t plh ? 5 ? t phl reset to output ? 5 ? s t plh ? 1 ? output transistor switching characteristics (design target value) t phl 7 enable to output ? 0.5 ? ms upper i oh ? ? 1 output leakage current lower i ol 6 v m = 13 v ? ? 1 a note: relative to the peak current at = 0.
tb6608fng 2007-12-17 22 test circuit 1: v in (h) , v in (l) , i inh , i inl test circuit 2: i cc , i m v cc = 3.3 v v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m = 5 v v m ao1 ao2 bo1 bo2 rfa rfb 2 tb6608fng gnd a 2 i m a i cc v cc = 3.3 v v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m = 5 v v m ao1 ao2 bo1 bo2 rfa rfb 2 tb6608fng gnd a i inh v in (h) a i inl v in (l) 2 oscilloscope
tb6608fng 2007-12-17 23 test circuit 3: v rfa , v rfb test circuit 4: v sat (ul) v v cc = 3.3 v v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m = 5 v v m ao1 ao2 bo1 bo2 rfa rfb tb6608fng gnd 3.3 v v v cc = 3.3 v v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m = 5 v v m ao1 ao2 bo1 bo2 rfa rfb tb6608fng gnd 3.3 v 220 pf 5 mh /50 5 mh /50 v 2 v 2
tb6608fng 2007-12-17 24 test circuit 5: v f u , v f l test circuit 6: i o h , i o l v cc = 3.3 v 13 v v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m ao1 ao2 bo1 bo2 rfa rfb tb6608fng gnd a 13 v a v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc v m ao1 ao2 bo1 bo2 rfa rfb tb6608fng gnd v
tb6608fng 2007-12-17 25 ac electrical characteristi cs, test circuit 7: ck (osc) and output voltage 50% 90% 50% 10% 50% 90% 50% 10% t clock (t osc ) t clock (t osc ) t r t plh t f t phl v m output voltage gnd clock (osc)
tb6608fng 2007-12-17 26 application circuit example note 1: capacitors for the power supply lines should be connected as close to the ic as possible. note 2: the stby pin must be set low upon powering on and off the device. otherwise, a large current might abruptly flow through the output pins. also, at the power-on, v m must be applied after applying v cc . at the power-off, v cc must be turned off after turning off v m . usage considerations a large current might abruptly flow through the ic in case of a short-circuit across its outputs, a short-circuit to power supply or a short-circuit to ground, leading to a damage of the ic. also, the ic or peripheral parts may be permanently damaged or emit smoke or fire result ing in injury especially if a power supply pin (v cc , v m ) or an output pin (ao1, ao2, bo1, bo2) is short- circuited to adjacent or any other pins. these possibilities should be fully cons idered in the design of the output, v cc , v m and ground lines. install this ic correctly. if not, (e.g., installing it in the wrong position,) the ic may be damaged permanently. fuses should be connected to the power supply lines. 0.1 f 47 f v cc = 3.3 v clock cw/ccw reset enable standby h/l h/l h/l h/l 220 pf v cc mo ck cw/ccw reset enable stby m1 m2 dcy tq osc 0.1 f 47 f v m = 5 v v m ao1 ao2 cpu i/o bo1 bo2 rfa rfb stepping motor 2 2 gnd tb6608fng
tb6608fng 2007-12-17 27 package dimensions weight: 0.09 g (typ.)
tb6608fng 2007-12-17 28 notes on contents 1. block diagrams some of the functional blocks, circ uits, or constants in the block diagram may be omitted or simplified for explanatory purposes. 2. equivalent circuits the equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. 3. timing charts timing charts may be simplified for explanatory purposes. 4. application circuits the application circuits shown in this document ar e provided for reference purposes only. thorough evaluation is required, especially at the mass production design stage. toshiba does not grant any license to any industrial property rights by prov iding these examples of application circuits. 5. test circuits components in the test circuits are used only to obtain and confirm the devi ce characteristics. these components and circuits are not guaranteed to prev ent malfunction or failure from occurring in the application equipment. ic usage considerations notes on handling of ics (1) the absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment. do not exceed any of these ratings. exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. (2) use an appropriate power supply fuse to ensure that a large current does not continuously flow in case of over current and/or ic failure. the ic will fully break down when used under conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise occurs from the wiring or load, causing a large cu rrent to continuously flow and the breakdown can lead smoke or ignition. to minimize the effects of the flow of a large current in case of breakdown, appropriate settings, such as fuse capacity, fusing time and insertion circuit location, are required. (3) if your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent device malfunction or breakdown caused by the current re sulting from the inrush current at power on or the negative current result ing from the back electromotive force at power off. ic breakdown may cause injury, smoke or ignition. use a stable power supply with ics with built-in protec tion functions. if the power supply is unstable, the protection function may not operate, causing ic breakdown. ic breakdown may cause injury, smoke or ignition. (4) do not insert devices in the wrong orientation or incorrectly. make sure that the positive and negative terminals of power supplies are connected properly. otherwise, the current or power consumption may exceed the absolute maximum rating, and exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. in addition, do not use any device that is applied th e current with inserting in the wrong orientation or incorrectly even just one time.
tb6608fng 2007-12-17 29 points to remember on handling of ics (1) thermal shutdown circuit thermal shutdown circuits do not necessarily prot ect ics under all circumst ances. if the thermal shutdown circuits operate against th e over temperature, clear the heat generation status immediately. depending on the method of use and usage condit ions, such as exceeding absolute maximum ratings can cause the thermal shutdown circuit to not oper ate properly or ic breakdown before operation. (2) heat radiation design in using an ic with large current flow such as power amp, regulator or driver, please design the device so that heat is appropriately radiated, not to exceed the specified junction temperature (t j ) at any time and condition. these ics generate heat even du ring normal use. an inadequate ic heat radiation design can lead to decrease in ic life, deterioration of ic characteristics or ic breakdown. in addition, please design the device taking into considerate the effect of ic heat radiation with peripheral components. (3) back-emf when a motor rotates in the reverse direction, stops or slows down abruptly, a current flow back to the motor?s power supply due to the effect of back-emf. if the current sink capability of the power supply is small, the device?s motor power supply and outp ut pins might be exposed to conditions beyond maximum ratings. to avoid this problem, take the effect of back-emf into consideration in system design.
tb6608fng 2007-12-17 30 restrictions on product use 070122eba_r6 ? the information contained herein is subject to change without notice. 021023_d ? toshiba is continually working to improve the quality a nd reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their i nherent electrical sensitivity and vulnerability to physical stress. it is the responsibility of t he buyer, when utilizing toshiba products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within s pecified operating ranges as set forth in the most recent toshiba products specific ations. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semico nductor devices,? or ?toshiba semiconductor reliability handbook? etc. 021023_a ? the toshiba products listed in this document are in tended for usage in general electronics applications (computer, personal equipment, office equipment, measuri ng equipment, industrial robotics, domestic appliances, etc.). these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunc tion or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage incl ude atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffi c signal instruments, comb ustion control instruments, medical instruments, all types of safety devices, et c. unintended usage of toshiba products listed in this document shall be made at the customer?s own risk. 021023_b ? the products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. 060106_q ? the information contained herein is presented only as a gu ide for the applications of our products. no responsibility is assumed by toshiba for any infringements of patents or other rights of the third parties which may result from its use. no license is granted by imp lication or otherwise under any patents or other rights of toshiba or the third parties. 070122_c ? please use this product in compliance with all applicable la ws and regulations that regulate the inclusion or use of controlled substances. toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations. 060819_af ? the products described in this document are subject to foreign exchange and foreign trade control laws. 060925_e

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