ampson technology, inc. a6406rd/a6406fg 1/6 8/11/2003 rev.1.2 2-phase half-wave motor predriver features 1) rotation detection(a6406rd) and rotational speed sensing(a6406fg) mechanisms are built in. 2) compact 8-pin sop package reduces the number of external components required. 3) automatic restart when the motor lock is undone. 4) hall inputs have a hysteresis. absolute maximum ratings parameter symbol limits unit applied voltage v cc 30 v power dissipation p d 550 *1 mw operating temperature t opr -40 ~ +95 o c storage temperature t stg -55 ~ +125 o c output current io max. 70 ma *1: reduced by 5.5mw for each increase in ta of 1 o c over 25 o c when mounted on a glass epoxy board (50x50x1.6mm). operating power supply voltage ( ta =+25 o c) characteristic symbol conditions min typ max units applied voltage v cc operate within the allowable power dissipation for -30 o c ampson technology, inc. a6406rd/a6406fg 2/6 8/11/2003 rev.1.2 block diagram and application example vcc 1234 regulator logic hall amp rotation detection or fg automatic reset 8765 hall
ampson technology, inc. a6406rd/a6406fg 3/6 8/11/2003 rev.1.2 electrical characteristics ( unless otherwise noted, ta =+25 o c and vcc=12v) characteristic symbol conditions min typ max units when output is off. - 2.5 4 ma supply current i cc when output is on. 3.2 5 ma hall amplifier input hysteresis (+) v hys + pin2 voltage with respect to pin4 voltage , v b =6v 3 - 15 mv hall amplifier input hysteresis (-) v hys - pin2 voltage with respect to pin4 voltage , v b =6v -3 - -15 mv pin6 charge current i 6c v6pin = 1.5v 1.6 2.5 3.75 ua pin6 discharge current i 8d v6pin = 1.5v 0.25 0.50 1.0 ua pin6 charge-discharge ratio r cd i 6c / i 6d 3 4.5 8 - pin6 clamp voltage v 6cl - 2.2 2.6 3.0 v pin6 comparator voltage v 6cp - 0.4 0.6 0.8 v pin7 output high level voltage v 7h i o = 10ma 10 10.5 - v pin8 output high level voltage v 8h i o = 10ma 10 10.5 - v pin3 rd output low level voltage v 3l i 3l = 5.0ma - - 0.5 v pin3 rd current capacity i 3 v 3l = 2.0v 8.0 - - ma pin3 fg current capacity i 3 v 3l = 2.0v 8.0 - - ma pin3 fg output voltage v fg(l) i 3l =5ma ? 0.2 0.4 v pin description 1 2 3 4 8 7 6 5 6 4 0 6 x x x x x 6406xx : part number 6406rd : rd single output 6406fg : fg single output xxx : date code ( ex : 52z ) 52 : week ( ex=>52:52 week . 35:35 week ) z : year ( ex=>z:dc2001 , y:dc2002 , x:dc2003 ) remark : name p/i/o pin # description vcc p 1 positive power supply h1 i 2 input pin rd / fg o 3 rotation detection / frequency generation h2 i 4 input pin vss p 5 ground c1 i 6 capacitor do o 7 output pin dob o 8 output pin
ampson technology, inc. a6406rd/a6406fg 4/6 8/11/2003 rev.1.2 rotation detection the automatic restart circuit detects a motor lock condition and automatically turns off the output current. when the lock condition is cleared, the ic automatically restarts and allow the motor to run. in the a6406rd/fg, automatic restart is performed in the following manner. a motor lock condition is detected when the hall signal stops switching. the output is on when pin 6 is being charged, and off when pin 6 is being discharged. pin 3 is on during normal operation, and off when the motor is locked. pin 3 is an open collector output. hall input motor output pin6 pin3(a6406rd) on off pin6 clamp voltage pin6 comparator voltage motor locked motor locked detected motor lock cleared reverts to normal operation high t on* t off* low fig.1 output on time (t on ) and off time (t off ) determined by the pin 6 capacitor where c x ( v 6cl ? v 6cp ) t on = i 6c (sec) c x ( v 6cl ? v 6cp ) t off = i 6d (sec) c is the capacitance of the pin-6 external capacitor v 6cl is the pin 6 clamp voltage v 6cp is the pin 6 comparator voltage i 6c is the pin 6 charge current i 6d is the pin 6 discharge current
ampson technology, inc. a6406rd/a6406fg 5/6 8/11/2003 rev.1.2 operation notes (1) the lock detection output pin (pin 3) may maintain high level for a few hundred milliseconds when the power is turned on. pin3 power a few hundred milliseconds fig.2 (2) allowable power dissipation the allowable power dissipation is plotted against ambient temperature in fig. 3. (3) power dissipation power consumed in the i c can be calculated from the following equation: p c = p c1 + p c2 + p c3 1. p c1 is power consumed by the circuit current. p c1 = v cc x i cc 2. p c2 is the output current consumption. p c2 = (v cc ? v oh ) x i o 0.2 0.4 0.6 0.8 1.0 25 50 75 100 125 150 a6406rd/fg ambient temperature:ta ( c) o power dissipation:pd (w) fig.3 v oh is the high level voltage of pins 7 and 8. power dissipation can be reduced by raising the hfe-rank of the external output transistor and thereby reducing the i o value. 3. p c3 is power consumed by pin 3. p c3 = v 3l x i 3 where v 3l is the pin-3 low level voltage and i 3 is the pin-3 current. make sure that your application does not exceed the allowable power dissipation of the ic. electrical characteristic curves 5 10 15 2 pin 3 supply voltage (v) i3l (ma) 04610 8121418 16 20 20 vcc= 12v 0 a6406rd a6406fg 8 fig.4 current capacity vs. supply voltage for pin3 11 20 pin7,8 output current (ma) pin 7,8 output voltage (v) 0406080 12 10 fig.5 output voltage vs. output current for pins 7 and 8
ampson technology, inc. a6406rd/a6406fg 6/6 8/11/2003 rev.1.2 package information (sop-8) a 0.015x45 view "a" l h e a2 a1 b e y 7 (4x) d c 7 (4x) view "a" dimensions in millimeters dimensions in inches symbols min nom max min nom max a 1.40 1.60 1.75 0.055 0.063 0.069 a1 0.10 ? 0.25 0.040 ? 0.100 a2 1.30 1.45 1.50 0.051 0.057 0.059 b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.20 0.25 0.0075 0.008 0.010 d 4.80 4.85 5.05 0.189 0.191 0.199 e 3.80 3.91 4.00 0.150 0.154 0.157 e ? 1.27 ? ? 0.050 ? h 5.79 5.99 6.20 0.228 0.236 0.244 l 0.38 0.71 1.27 0.015 0.028 0.050 y ? ? 0.10 ? ? 0.004 0 o ? 8 o 0 o ? 8 o
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