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ordering number : enn6507 22002tn (ot) no. 6507-1/17 overview the STK672-080 is a stepping motor driver hybrid ic that uses power mosfets in the output stage. it includes a built-in microstepping controller and is based on a unipolar constant-current pwm system. the STK672-080 supports application simplification and standardization by providing a built-in 4 phase distribution stepping motor controller. it supports five excitation methods: 2 phase, 1-2 phase, w1-2 phase, 2w1-2 phase, and 4w1-2 phase excitations, and can provide control of the basic stepping angle of the stepping motor divided into 1/16 step units. it also allows the motor speed to be controlled with only a clock signal. the use of this hybrid ic allows designers to implement systems that provide high motor torques, low vibration levels, low noise, fast response, and high-efficiency drive. compared to the earlier sanyo stk672-050, the STK672-080 features a significantly smaller package for easier mounting in end products. applications facsimile stepping motor drive (send and receive) paper feed and optical system stepping motor drive in copiers laser printer drum drive printer carriage stepping motor drive x-y plotter pen drive industrial robots and other stepping motor applications features can implement stepping motor drive systems simply by providing a dc power supply and a clock pulse generator. one of five drive types can be selected with the drive mode settings (m1, m2, and m3) ? phase excitation drive ?-2 phase excitation drive ?1-2 phase excitation drive ?w1-2 phase excitation drive ?w1-2 phase excitation drive phase retention even if excitation is switched. the moi phase origin monitor pin is provided. the clk input counter block can be selected to be one of the following by the high/low setting of the m3 input pin. ?ising edge only ?oth rising and falling edges note*: conditions: v cc 1 = 24 v, i oh = 2.0 a, 2w1-2 drive used. continued on next page. package dimensions unit: mm 4186 1 15 46.6 41.2 12.7 25.5 (6.6) 14 2.0=28 3.6 0.5 2.0 8.5 4.0 0.4 2.9 1.0 [STK672-080] STK672-080 sanyo electric co.,ltd. semiconductor company tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110-8534 japan stepping motor driver (sine wave drive) output current: 2.8 a (no heat sink * ) unipolar constant-current chopper (external excitation pwm) circuit with built-in microstepping controller thick-film hybrid ic any and all sanyo products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft? control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. consult with your sanyo representative nearest you before using any sanyo products described or contained herein in such applications. sanyo assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all sanyo products described or contained herein.
the clk input pin include built-in malfunction prevention circuits for external pulse noise. enable and reset pins provided. these are schmitt trigger inputs with built-in 20 k (typical) pull-up resistors. no noise generation due to the difference between the a and b phase time constants during motor hold since external excitation is used. microstepping operation supported even for small motor currents, since the reference voltage vref can be set to any value between 0 v and 1/2 v cc 2. external excitation pwm drive allows a wide operating supply voltage range (v cc 1 = 10 to 45 v) to be used. current detection resistor (0.15 ) built into the hybrid ic. power mosfets for minimal driver loss motor output drive currents i oh up to 2.8 a (when tc = 105 c). no. 6507- 2 /17 STK672-080 parameter symbol conditions ratings unit maximum supply voltage1 v cc 1 max no signal 52 v maximum supply voltage2 v cc 2 max no signal ?.3 to +7.0 v input voltage v in max logic input pins ?.3 to +7.0 v phase output current i oh max 0.5 seconds, single pulse, with v cc 1 applied. 3.3 a repeatable avalanche current ear max 30 mj power loss pd max q c-a = 0 8 w operating substrate temperature tc max 105 c junction temperature tj max 150 c storage temperature tstg ?0 to +125 c specifications absolute maximum ratings at tc = 25 c parameter symbol conditions ratings unit supply voltage1 v cc 1 with input signals present 10 to 45 v supply voltage2 v cc 2 with input signals present 5 5% v input voltage v ih 0 to v cc 2 v phase driver voltage handling v dss tr1, 2, 3, and 4 (the a, a, b, and b outputs) 100 (min) v phase current 1 i oh 1 tc = 105 c, clk 3 200 hz 2.8 a phase current 2 i oh 2 tc = 80 c, clk 3 200 hz 3 a allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit min typ max control supply current i cc pin 6 input, with enable pin held low. 2.1 14 ma output saturation voltage vsat r l = 12 0.65 1 v average output current io ave load: r = 3.5 w/l = 3.8 mh per phase 0.445 0.5 0.56 a fet diode forward voltage vdf if = 1 a 1 1.5 v [control inputs] input voltage v ih except for the vref pin 4 v v il except for the vref pin 1 v input current i ih except for the vref pin 0 1 10 a i il except for the vref pin 125 250 510 a [vref input pin] input voltage v i pin 7 0 2.5 v input current i i pin 7, 2.5-v input 330 415 545 a [control outputs] output voltage v oh i = ? ma, pin moi 2.4 v v ol i = +3 ma, pin moi 0.4 v electrical characteristics at tc = 25 c, v cc 1 = 24 v, v cc 2 = 5 v continued on next page. continued from preceding page.
no. 6507- 3 /17 STK672-080 parameter symbol conditions ratings unit min typ max [current distribution ratio (a?)] 2w1-2, w1-2, 1-2 vref q = 1/8 100 % 2w1-2, w1-2 vref q = 2/8 92 % 2w1-2 vref q = 3/8 83 % 2w1-2, w1-2, 1-2 vref q = 4/8 71 % 2w1-2 vref q = 5/8 55 % 2w1-2, w1-2 vref q = 6/8 40 % 2w1-2 vref q = 7/8 21 % 2 vref 100 % pwm frequency fc 37 47 57 khz continued from preceding page. note: a constant-voltage power supply must be used. the design target value is shown for the current distribution ratio.
1 4 1 3 1 5 1 2 1 1 1 0 9 8 6 7 5 4 3 2 + + 1 m 1 m 2 c w b c l o c k e x c i t a t i o n m o d e c o n t r o l e x c i t a t i o n s t a t e m o n i t o r c r o s c i l l a t o r p w m c o n t r o l p h a s e a d v a n c e c o u n t e r c u r r e n t d i s t r i b u t i o n r a t i o s w i t c h i n g p h a s e e x c i t a t i o n d r i v e s i g n a l g e n e r a t i o n r e f e r e n c e c l o c k g e n e r a t i o n p s e u d o - s i n e w a v e g e n e r a t o r r a i s i n g e d g e / f a l l i n g e d g e d e t e c t i o n a n d s w i t c h i n g m 3 r e s e t m o i e n a b l e s u b p g b b b a b a v r e f v c c 2 a 1 3 2 5 6 internal block diagram no. 6507- 4 /17 STK672-080
test circuit diagrams no. 6507- 5 /17 STK672-080 11 8 9 7 13 1 2 3 4 5 a rl ab b bb 6 + v cc 2 v cc 2 STK672-080 start vref=2.5v v 1 2 3 4 5 a ab b bb 6 v cc 1 STK672-080 v a a13257 a13258 vsat vdf i ih , i il loave, icc, fc to measuring io ave: with sw1 set to the b position, input vref and switch sw2. to measuring fc: with sw1 set to the a position, set vref to 0 v, and switch sw3. to measuring icc: set the enable pin low. + start 11 8 9 7 13 1 2 3 4 5 a a b a b ab b sw2 sw3 sw1 bb 6 15 v cc 2 vref enable v cc 1 v cc 1 STK672-080 a13260 8 1 6 a a 2.5v v cc 2 m1 STK672-080 a13259 9 m2 12 m3 11 clk 10 cwb 14 13 reset 15 enable 7 vref a a fc i il i ih
no. 6507- 6 /17 STK672-080 7 5 a two-phase stepping motor ab 6 14 14 8 14 14 9 14 14 12 15 11 13 10 14 + + v cc 2=5v v cc 2=5v sg 100 f or higher pg vref ro1 ro2 v cc 2=5v clk enable cbw vf 0.3v reset moi v cc 1=10v to 45v STK672-080 a13261 b bb rox 4 3 2 1 ioave i ol i oh 0a motor current waveform a13262 simplified power-on reset circuit (this circuit cannot be used to detect drops in the power-supply voltage.) always perform a power-on reset operation when the v cc 2 supply voltage is first applied to this hybrid ic. a value of about 100 is recommended for r o 2 to minimize the influence of the vref pin internal impedance, which is 6 k . r o x: the input impedance is 6 k 30%. functional description 2w1-2 phase excitation drive (microstepping operation) [setting the motor current] the motor current i oh is set by the vref voltage on the hybrid ic pin 7. the following formula gives the relationship between i oh and vref. r o x = (r o 2 6 k ) ? (r o 2 + 6 k ) (1) vref = v cc 2 r o x ? (r o 1 + r o x) (2) 1 vref i oh = (3) k r s k: 4.7 (voltage division ratio), rs: 0.15 (the hybrid ic? internal current detection resistor (precision: 3%) applications can use motor currents from the current (0.05 to 0.1 a) set by the duty of the frequency set by the oscillator up to the limit of the allowable operating range, i oh = 2.8 a [function table] m2 0 0 1 1 m1 0 1 0 1 phase switching clock edge timing m3 1 2 phase excitation 1-2 phase excitation w1-2 phase excitation 2w1-2 phase excitation rising edge only 0 1-2 phase excitation w1-2 phase excitation 2w1-2 phase excitation 4w1-2 phase excitation rising and falling edges forward reverse cwb 0 1 enable motor current is cut off when low reset active low
no. 6507- 7 /17 STK672-080 d1 rs l2 v cc 1 i off l1 mosfet enable divider latch circuit cr oscillator current divider noise filter a (control signal) and q s r 800khz 45khz vref a=1 + i on a13263 functional description external excitation chopper drive block description since this hybrid ic adopts an external excitation method, no external oscillator circuit is required. when a high level is input to ? in the basic driver block circuit shown in the figure and the mosfet is turned on, the comparator + input will go low and the comparator output will go low. since a set signal with the pwm period will be input, the q output will go high, and the mosfet will be turned on as its initial value. the current i on flowing in the mosfet passes through l1 and generates a potential difference in rs. then, when the rs potential and the vref potential become the same, the comparator output will invert, and the reset signal q output will invert to the low level. then, the mosfet will be turned off and the energy stored in l1 will be induced in l2 and the current i off will be regenerated to the power supply. this state will be maintained until the time when an input to the latch circuit set pin occurs. in this manner, the q output is turned off and on repeatedly by the reset and set signals, thus implementing constant current control. the resistor and capacitor on the comparator input are spike removal circuit elements and synchronize with the pwm frequency. since this hybrid ic uses a fixed frequency due to the external excitation method and at the same time also adopts a synchronized pwm technique, it can suppress the noise associated with holding a position when the motor is locked. driver block basic circuit structure input pin functions pin no. symbol function pin circuit type 11 clk phase switching clock built-in pull-up resistor cmos schmitt trigger input 10 cwb rotation direction setting (cw/ccw) built-in pull-up resistor cmos schmitt trigger input 15 enable output cutoff built-in pull-up resistor cmos schmitt trigger input 8, 9, 12 m1, m2, m3 excitation mode setting built-in pull-up resistor cmos schmitt trigger input 13 reset system reset built-in pull-up resistor cmos schmitt trigger input 7 vref current setting input impedance 6 k (typ.) 30%
input signal functions and timing clk (phase switching clock) input frequency range: dc to 50 khz minimum pulse width: 10 s duty: 40 to 60% (however, the minimum pulse width takes precedence when m3 is high.) pin circuit type: built-in pull-up resistor (20 k , typical) cmos schmitt trigger structure built-in multi-stage noise rejection circuit function ?hen m3 is high or open: the phase excited (driven) is advanced one step on each clk rising edge. when m3 is low: the phase moves on both the rising and falling edges of the clk signal, for a total of two steps per cycle. cwb (method for setting the rotation direction) pin circuit type: built-in pull-up resistor (20 k , typical) cmos schmitt trigger structure function ?hen cwb is high: the motor turns in the clockwise direction. ?hen cwb is low: the motor turns in the counterclockwise direction. notes: when m3 is low, the cwb input must not be changed for about 6.25 s before or after a rising or falling edge on the clk input. enable (controls the on/off state of the a, a, b, and b excitation drive outputs and selects either operating or hold as the internal state of this hybrid ic.) pin circuit type: built-in pull-up resistor (20 k , typical) cmos schmitt trigger structure function ?hen enable is high or open: normal operating state ?hen enable is low: this hybrid ic goes to the hold state and excitation drive output (motor current) is forcibly turned off. in this mode, the hybrid ic system clock is stopped and no inputs other than the reset input have any effect on the hybrid ic state. clk input acquisition timing (m3 = low) no. 6507- 8 /17 STK672-080 clk input system clock phase excitation counter clock control output timing excitation counter up/down control output switching timing a13264
no. 6507- 9 /17 STK672-080 output pin functions pin no. symbol function pin circuit type 14 moi phase excitation monitor standard cmos structure m1, m2, and m3 (excitation mode and clk input edge timing selection) pin circuit type: built-in pull-up resistor (20 k , typical) cmos schmitt trigger structure valid mode setting timing: applications must not change the mode in the period 5 s before or after a clk signal rising or falling edge. mode setting acquisition timing m2 0 0 1 1 m1 0 1 0 1 phase switching clock edge timing m3 1 2 phase excitation 1-2 phase excitation w1-2 phase excitation 2w1-2 phase excitation rising edge only 0 1-2 phase excitation w1-2 phase excitation 2w1-2 phase excitation 4w1-2 phase excitation rising and falling edges clk input system clock m1 to m3 mode switching timing excitation counter up/down mode setting mode switching clock hybrid ic internal setting state phase excitation clock a13265 function: ?reset (resets all parts of the system.) pin circuit type: built-in pull-up resistor (20 k , typical) cmos schmitt trigger structure function all circuit states are set to their initial values by setting the reset pin low. (note that the pulse width must be at least 10 s.) at this time, the a and b phases are set to their origin, regardless of the excitation mode. the output current goes to about 71% after the reset is released. notes: when power is first applied to this hybrid ic, vref must be established by applying a reset. applications must apply a power on reset when the v cc 2 power supply is first applied. vref (sets the current level used as the reference for constant-current detection.) pin circuit type: analog input structure function constant-current control can be applied to the motor excitation current at 100% of the rated current by applying a voltage less than the control system power supply voltage v cc 2 minus 2.5 v. applications can apply constant-current control proportional to the vref voltage, with this value of 2.5 v as the upper limit. output signal functions and timing a, a, b, and b (motor phase excitation outputs) function in the 4 phase and 2 phase excitation modes, a 3.75 s (typical) interval is set up between the a and a and b and b output signal transition times.
phase states during excitation switching excitation phases before and after excitation mode switching no. 6507- 10 /17 STK672-080 b 24 24 27 28 31 3 4 5 8 11 12 15 16 19 20 25 a a a 0 16 17 1 a a b b b 24 25 26 27 28 29 30 31 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24 26 28 30 0 2 4 6 8 10 12 14 16 18 20 22 22 23 a a b b 8 9 12 4 28 20 20 24 28 0 4 8 12 16 b 24 26 28 30 a a a 0 16 18 20 22 24 28 0 4 8 12 16 20 20 28 4 12 20 28 4 0 12 16 16 18 20 22 24 25 27 29 31 1 3 5 7 9 23 22 8 24 20 10 26 18 12 16 14 28 30 6 4 2 0 11 21 13 19 15 17 24 28 0 4 8 12 16 20 26 28 30 0 2 4 6 8 10 12 14 2 4 6 b b a b a b 30 2 26 6 10 14 22 18 a b a b a b a b b a a b b 8 10 12 14 12 4 28 20 2w1-2 phase ? 2 phase w1-2 phase ? 2 phase 1-2 phase ? 2 phase 2 phase ? 1-2 phase excitation phase according to the first clock input pulse after changing the exc itation mode setting (m1 to m2) excitation phase immediately before setting the excitation mode 2w1-2 phase ? 1-2 phase w1-2 phase ? 1-2 phase 1-2 phase ? w1-2 phase 2 phase ? w1-2 phase 2 phase ? 2w1-2 phase 2w1-2 phase ? w1-2 phase w1-2 phase ? 2w1-2 phase 1-2 phase ? 2w1-2 phase 24 0 8 16 20 22 30 28 4 12 20 14 6 28 4 12 a b a b 29 1 25 5 9 13 21 24 28 0 4 8 12 16 20 17 a b a b 29 5 13 21 28 20 4 12 17 a b a b a13266
no. 6507- 11 /17 STK672-080 excitation phases before and after excitation mode switching b 24 23 24 25 28 29 0 1 4 5 8 9 12 13 16 17 20 21 a a a 0 16 15 31 a a b b b 24 25 26 27 28 29 30 31 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24 26 28 30 0 2 4 6 8 10 12 14 16 18 20 22 22 23 a a b b 8 7 12 4 28 20 20 24 28 0 4 8 12 16 b 24 30 a a a 0 16 22 24 28 0 4 8 12 16 20 20 28 4 12 16 28 24 20 0 4 12 16 18 20 22 24 25 27 29 31 1 3 5 7 9 23 22 8 24 20 10 26 18 12 16 14 28 30 6 4 2 0 11 21 13 19 15 17 24 28 0 4 8 12 16 20 26 28 30 0 2 4 6 8 10 12 14 6 b b a b a b 30 2 26 6 10 14 22 18 a b a b a b a b b a a b b 8 14 12 4 28 20 24 0 8 16 20 26 2 10 28 4 12 20 28 4 12 20 18 28 4 12 a b a b 30 3 27 7 11 15 23 24 28 0 4 8 12 16 20 19 a b a b 27 3 11 19 a b a b a13267 2w1-2 phase ? 2 phase w1-2 phase ? 2 phase 1-2 phase ? 2 phase 2 phase ? 1-2 phase 2w1-2 phase ? 1-2 phase w1-2 phase ? 1-2 phase 1-2 phase ? w1-2 phase 2 phase ? w1-2 phase 2 phase ? 2w1-2 phase 2w1-2 phase ? w1-2 phase w1-2 phase ? 2w1-2 phase 1-2 phase ? 2w1-2 phase
no. 6507- 12 /17 STK672-080 m1 0 m2 0 m3 reset cwb clk moi 0 1 2 phase excitation timing chart (m3=1) 1-2 phase excitation timing chart (m3=1) 2w1-2 phase excitation timing chart (m3=1) w1-2 phase excitation timing chart (m3=1) m1 1 0 1 0 m2 0 m3 reset cwb clk moi m1 1 1 0 m2 0 m3 reset cwb clk moi 0 m1 1 0 1 0 1 0 m2 m3 reset cwb clk moi mosfet gate signal comparator reterence voltage a a b b vref a vref b 100% 71% 100% 71% comparator reterence voltage vref a 100% 92% 71% 40% vref b 100% 92% 71% 40% moi comparator reterence voltage vref a 100% 92% 83% 71% 55% 40% 20% moi mosfet gate signal a a b b mosfet gate signal comparator reterence voltage a a b b vref a vref b 100% 71% 100% 71% mosfet gate signal a a b b vref b 100% 92% 83% 71% 55% 40% 20% a13268 excitation time and timing charts clk rising edge operation
clk rising and falling edge operation no. 6507- 13 /17 STK672-080 m1 0 m2 0 m3 reset cwb clk mosfet gate signal comparator reterence voltage a a b b moi vref a vref b 100% 71% 100% 71% comparator reterence voltage vref a vref b 100% 92% 83% 71% 55% 40% 20% 20% 0 m1 1 0 m2 0 m3 reset cwb clk 0 m1 0 m2 0 1 m3 reset cwb clk moi 100% 92% 83% 71% 55% 40% comparator reterence voltage vref a 100% 97% 88% 77% 66% 48% 31% 66% 48% 31% 14% 92% 83% 71% 55% 40% 20% 0 m1 1 0 1 0 m2 0 m3 reset cwb clk moi 0 mosfet gate signal a a b b mosfet gate signal comparator reterence voltage a a b b moi vref a vref b 100% 71% 40% 92% 100% 92% 71% 40% mosfet gate signal a a b b vref b 100% 97% 88% 77% 14% 92% 83% 71% 55% 40% 20% a13269 1-2 phase excitation timing chart (m3=0) w1-2 phase excitation timing chart (m3=0) 4w1-2 phase excitation timing chart (m3=0) 2w1-2 phase excitation timing chart (m3=0)
thermal design the main elements internal to this hybrid ic with large average power losses are the current control devices, the regenerative current diodes, and the current detection resistor. since sine wave drive is used, the average power loss during microstepping drive can be approximated by applying a waveform factor of 0.64 to the square wave loss during 2 phase excitation. the losses in the various excitation modes are as follows. fclock i oh ?fclock 2 phase excitation pd 2ex = (vsat + vdf) ?i oh ?t2 + ?(vsat ?t1 + vdf ?t3) 2 2 fclock i oh ?fclock 1-2 phase excitation pd 1-2ex = 0.64 ?{(vsat + vdf) ?i oh ?t2 + ?(vsat ?t1 + vdf ?t3)} 4 4 fclock i oh ?fclock w1-2 phase excitation pd w1-2ex = 0.64 ?{(vsat + vdf) ?i oh ?t2 + ?(vsat ?t1 + vdf ?t3)} 8 8 fclock i oh ?fclock 2w1-2 phase excitation pd 2w1-2ex = 0.64 ?{(vsat + vdf) ?i oh ?t2 + ?(vsat ?t1 + vdf ?t3)} 16 16 fclock i oh ?fclock 4w1-2 phase excitation pd 4w1-2ex = 0.64 ?{(vsat + vdf) ?i oh ?t2 + ?(vsat ?t1 + vdf ?t3)} 16 16 here, t1 and t3 can be determined from the same formulas for all excitation methods. ? r + 0.35 ? v cc 1 + 0.35 t1 = n (1 ?i oh ) t3 = ? n () r + 0.35 v cc 1 r i oh ?r + v cc 1 + 0.35 however, the formula for t2 differs with the excitation method. 2 3 2 phase excitation t2 = ?(t1 +t3) 1-2 phase excitation t2 = ?t1 fclock fclock 7 15 w1-2 phase excitation t2 = ?t1 2w1-2 phase excitation t2 = ?t1 fclock 4w1-2 phase excitation fclock motor phase current model figure (2 phase excitation) fclock: clk input frequency (hz) vsat: the voltage drop of the power mosfet and the current detection resistor (v) vdf: the voltage drop of the body diode and the current detection resistor (v) i oh : phase current peak value (a) t1: phase current rise time (s) v cc 1: supply voltage applied to the motor (v) t2: constant-current operating time (s) l: motor inductance (h) t3: phase switching current regeneration time (s) r: motor winding resistance (w) no. 6507- 14 /17 STK672-080 t3 t1 t2 i oh a13270
next we determine the usage conditions with no heat sink by determining the allowable hybrid ic internal average loss from the thermal resistance of the hybrid ic substrate, namely 25.5 c/w. 105 ?50 for a tc max of 105 c at an ambient temperature of 50 c pd ex = = 2.15 w 25.5 105 ?40 for a tc max of 105 c at an ambient temperature of 40 c pd ex = = 2.54 w 25.5 this hybrid ic can be used with no heat sink as long as it is used at operating conditions below the losses listed above. (see ? tc ?p d curve in the graph on page 17.) the junction temperature, tj, of each device can be determined from the loss pds in each transistor and the thermal resistance q j-c. tj = tc + q j-c pds ( c) here, we determine pds, the loss for each transistor, by determining pd ex in each excitation mode. pds = pd/4 since the average loss includes the loss of the current detection resistor, we take that voltage drop into consideration in the calculation. vsat = i oh ?ron + i oh ?rs vdf = vdf + i oh ?rs the steady-state thermal resistance of a power mosfet is 15.6 c/w. no. 6507- 15 /17 STK672-080 4 0 8 12 16 20 0 2 4 6 8 10 12 14 16 2 1.0 3 7 5 10 2 10 2 3 5 7 100 2 3 5 no. fin 25.5( c/w) no. fin 25.5( c/w) 40 c 50 c 60 c q c-a= tc max ?ta ( c/w) tc max=105 c pd guaranteed ambient temperature 2 mm thick al plate (with no surface preparation) (with the surface painted black) vertical standing type convection cooling determine q c-a for the heat sink from the average power loss determined in the previous item. tc max: hybrid ic substrate temperature ( c) ta: application internal temperature ( c) pd ex : hybrid ic internal average loss (w) determine q c-a from the above formula and then size s (in cm 2 ) of the heat sink from the graphs shown below. the ambient temperature of the device will vary greatly according to the air flow conditions within the application. therefore, always verify that the size of the heat sink is adequate to assure that the hybrid ic back surface (the aluminum plate side) will never exceed a tc max of 105 c, whatever the operating conditions are. tc max ?ta q c-a = [ c/w] pd ex ic internal average power dissipation, pd ?w heat sink thermal resistance, q c-a ? c/w heat sink thermal resistance, q c-a ? c/w heat sink area, s ?cm 2 pd ? q c-a s ? q c-a
no. 6507- 16 /17 STK672-080 35 37 39 41 43 45 47 49 51 53 55 4 4.5 5 5.5 6 39 41 35 37 43 45 47 49 51 53 55 0 20 40 60 80 100 120 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 0.5 1 2 1.5 2.5 3 3.5 0.4 0 0.2 0.6 0.8 1 1.2 1.4 1.6 0 0.5 1 1.5 2 2.5 3 0.5 0 1 1.5 2 2.5 0 10 20 30 40 50 0.5 0 1 1.5 2 2.5 0 20 40 60 80 100 120 100 0 50 150 200 250 300 350 400 450 0 20 40 60 80 100 120 100 150 50 0 200 250 300 350 400 450 0 0.5 1 1.5 2 2.5 i oh =1a vref=0 vref=2.5v vref=2v vref=1 i oh =2 tc=105 c tc=105 c tc=25 c tc=25 c tc=25 c supply voltage, v cc 2 ?v pwm frequency, fc ?khz fc ?v cc 2 substrate temperature, tc ? c pwm frequency, fc ?khz fc ?tc motor current, i oh ?a output saturation voltage, vsat ?v motor current vs. output supply voltage motor current, i oh ?a internal diode forward voltage, vdf ?v internal diode forward voltage vs. motor current motor voltage, v cc 1 ?v motor current, i oh ?a motor current vs. motor voltage substrate temperature, tc ? c motor current, i oh ?a motor current vs. substrate temperature reference voltage, vref ?v input current, ivref a reference voltage vs. input current substrate temperature, tc ? c reference voltage input current, ivref ? a reference voltage input current vs. substrate temperature
ps no. 6507- 17 /17 STK672-080 this catalog provides information as of february, 2002. specifications and information herein are subject to change without notice. specifications of any and all sanyo 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? 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? products or equipment. sanyo electric co., ltd. strives to supply high-quality high-reliability products. however, any and all semiconductor products fail with some probability. it is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. when designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. in the event that any or all sanyo products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned 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 information storage or retrieval system, or otherwise, without the prior written permission of sanyo electric co., ltd. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equipment, refer to the ?elivery specification for the sanyo product that you intend to use. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 0.5 1 1.5 2 2.5 20 0 10 30 40 50 60 70 80 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 0 2 3 5 7 1000 2 3 5 7 10000 2 3 5 7 100000 1 0 0.5 1.5 2 2.5 3 3.5 0 20 40 60 80 100 120 v cc 1: 24 v motor: pk264-02b motor voltage: 24 v motor resistance (r): 0.4 inductance (l): 1.2 mh 2ex 2w1-2ex clk 3 200hz v cc 1 : 24v test motor : pk264-02b motor current : i oh : 2-phase excitation: 1.5 a 2w1-2 phase excitation: 2 a with no heat sink hold mode notes the above current ranges apply when the output voltage is not in the avalanche state. the above operating substrate temperatures (tc) are measured when the motor is operating. since tc will vary depending on the a mbient temperature (ta), the value of i oh , and whether i oh is continuous or intermittent, the actual values of tc must be verified (measured) in an actual operating end product. motor current, i oh ?a reference voltage, vref ?v motor current vs. reference voltage hybrid ic internal average power dissipation, pd ?w substrate temperature rise, ? tc ? c ? tc ?pd clk frequency, pps - hz substrate temperature rise, ? tc ? c substrate temperature rise test operating substrate temperature, tc ? c motor current, i oh ?a motor current (i oh ) derating curves for the operating substrate temperature tc

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