?2000 fairchild semiconductor international www.fairchildsemi.com rev. 1.0.2 may. 2000. 1 features ? built-in power save function ? low saturation voltage ? low power dissipation ? input level: ttl, lsttl, 5v cmos compatible ? standard mpu direct interface ? built-in thermal shutdown(tsd) circuit description the KA2820D is a monolithic integrated circuit, and suit- able as a the two-phase stepping motor driver of a 5.25-inch fdd system. 20-sop-375 typical application ? floppy disk drive (fdd) ? general stepping motor ordering information device package operating temp. KA2820D2 20-sop-375 ? 20 ~ +75 c KA2820D stepping motor driver
KA2820D 2 pin assignments pin definitions pin number pin name i/o pin function description channel 1 nc - no connection - 2v s2a - a-channel holding supply voltage a 3v cc - logic part supply voltage a, b 4 dira i a-channel direction input a 5 gnd - signal ground a, b 6 gnd - signal ground a, b 7 dirb i b-channel direction input b 8 ps i power save input a, b 9v s2b - b-channel holding supply voltage b 10 nc - no connection - 11 nc - no connection - 12 v s1b - b-channel seeking supply voltage b 13 bout o b-channel output b 14 bout o b-channel inverting output b 15 gnd - power ground a, b 16 gnd - power ground a, b 17 aout o a-channel inverting output a 18 aout o a-channel output a 19 v s1a - a-channel seeking supply voltage a 20 nc - no connection - 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 KA2820D nc v s2a v cc dira gnd gnd dirb ps v s2b nc nc v s1a aout aout gnd gnd bout bout v s1b nc
KA2820D 3 internal block diagram absolute maximum ratings (ta = 25 c) recommended operating conditions (ta = 25 c) parameter symbol value unit logic part supply voltage v cc 7.0 v seeking supply voltage v s1 15.0 v holding supply voltage v s2 7.0 v input voltage v in v cc v seeking output current (continuouts) i os 330 ma seeking output current (peak) i ospeak 500 ma holding output current i oh 200 ma package power dissipation p d 1.0 w operating temperature range t opr ? 20 ~ 75 c storage temperature t stg ? 40 ~ 125 c parameter symbol min. typ. max unit logic part supply voltage v cc 4.5 5.0 5.5 v seeking supply voltage v s1 10.2 12.0 13.8 v holding supply voltage v s2 4.5 5.0 5.5 v ttl interface tsd ttl interface v s2a dira v cc gnd v s2b dirb ps v s1a aout aout gnd v s1b bout bout gnd gnd 2 4 3 5 6 9 7 8 15 13 14 12 16 18 17 19
KA2820D 4 electrical characteristics (ta=25 c, v cc =5v, v s1 =12v, v s2 =5v, unless specified otherwise) parameter symbol conditions min. typ. max. units digital input ?l? voltage v il ---0.8v digital input ?h? voltage v ih -2.0--v digital input ?l? current i il v in =0.8v - 0 10 a digital input ?h? current i ih1 v in =2.0v - 1 10 a i ih2 v in =5v - 0.3 1.0 ma iv ccl ps=0.8v - 25 33 ma iv s1l ps=0.8v - 6 10 ma supply current iv s2l ps=0.8v - - 0.1 ma iv cch ps=2.0v - 25 33 ma iv s1h ps=2.0v - 1 2 ma v s2h ps=2.0v - 2.5 4 ma output sustain voltage v sus i o =130ma, ps=0.8v 18 - - v vs1 output saturation voltage v sat1 i o =130ma, ps=2.0v - 1.5 2.0 v vs2 output saturation voltage v sat2 i o =130ma - 1.5 2.0 v output clamp voltage v fu i o =330ma (upper) - 3.0 5.0 v v fl i o =330ma (lower) - 1.5 2.0 v output delay time t plh input pulse (2khz) - 1.0 5.0 s t phl input pulse (2khz) - 1.0 5.0 s tsd operating temperature tsd - 125 150 - c tsd hysterisis ? tsd - - 25 - c
KA2820D 5 application information 1. motor control logic mode selection-truth table notes: dirx: dira or dirb (direction input) xout: aout or bout (non-inverting output) xout: aout or bout (inverting output) x: indicate each channel (a and b) 2. holding and seeking mode in rotating high speed (seeking mode), stepping motor is operated by high voltage (v s1 : seeking power supply voltage ?12?). in holding mode, stepping motor is operated by low voltage (v s2 : holding power supply voltage ?5?). when the ps input signal is high, it will be minimized power consumptio in this device. 3. maximum drive current capacity ? peak seeking output current: 0.5a ? continued seeking output current: 0.33a ? holding output current: 0.2a input output operating mode ps dirx xout xout l l l h+ seeking mode h+: operating by v s1 (v s1 =12v) lhh+l hllh ? open mode h ? : operating by v s2 (v s2 =5v) hhh ? l
KA2820D 6 timing chart 100 s seeking mode holding mode 100 s min ps min dira dirb aout aout bout bout h l l h l h v s1 v s2 0 v s1 v s2 0 v s1 v s2 0 v s1 v s2 0
KA2820D 7 typical application circuits 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc v s2a v cc dira gnd gnd dirb ps v s2b nc nc v s1a aout aout gnd gnd bout bout v s1b nc KA2820D load a (5v) a-ch in b-ch in mode selection load b (12v)
KA2820D 12/1/00 0.0m 001 stock#dsxxxxxxxx ? 2000 fairchild semiconductor international life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor international. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.
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