unisonic technologies co., ltd uh477 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2012 unisonic technologies co., ltd qw-r109-028.a single phase dc motor drive ic ? description the utc uh477 is particularly designed for a single phase dc motor driver circuit. it includes hall sensor and output coil drivers. the range of the operating voltage and the operation current is typically 0.3a. the utc uh477 is a well performance integrated ic with less required external components. the high sensitivity of hall effect sensor is suitable for motors from mini-type cpu coolers to blowers and dc fans. ? features * operating voltage ranges widely from 3.0v to 30v * 1 chip hall sensor/drivers * output thermal shutdown protect circuit * output sink current up to 300ma ? ordering information ordering number package packing lead free halogen free uh477l-g04-k UH477G-G04-K sip-4 bulk ? pin description pin no. pin name description 1 v cc ic power supply 2 no coil driver output is low st ate during the n magnetic field. 3 so coil driver output is low st ate during the s magnetic field. 4 gnd ic ground
uh477 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r109-028.a ? block diagram 2 3 4 1 pre-driver thermal shutdown latch circuit temperature compensated current amplifier hall element voltage regulator hysteresis control sensitivity control
uh477 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r109-028.a ? absolute maximum rating parameter symbol ratings unit v cc pin voltage 30 v output peak sink current peak current i out 800 ma hold current 600 ma continuous current 300 ma power dissipation t a =25c p d 600 mw t a =70c 450 mw junction temperature t j +150 c operating junction temperature t j 0 ~ +85 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? dc electrical characteristics parameter symbol test conditions min typ max unit supply voltage v cc 3 30 v quiescent supply current i cc v cc =30v, no use pin open 25 30 ma output saturation voltage v ce ( sink ) v cc =14v, i c =200ma 0.55 0.8 v v ce ( drive ) v cc =14v, i c =200ma 12.5 14 v ? ac electrical characteristics parameter symbol test conditions min typ max unit rise time t r r l =820 ? , c l =20pf 0.5 1.0 s fall time t f r l =820 ? , c l =20pf 0.5 1.5 s switch time differential t r l =820 ? , c l =20pf 1.0 0.5 s ? magnetic characteritics a grade parameter symbol min typ max unit operating point b op 10 45 gauss release point b rp -45 -10 b grade parameter symbol min typ max unit operating point b op 65 gauss release point b rp -65 c grade parameter symbol min typ max unit operating point b op 90 gauss release point b rp -90
uh477 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r109-028.a ? typical application circuit utc uh477
uh477 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r109-028.a ? application circuit the example of typical application circuit a typical application circuit is shown as follows. the r ed, yellow, and black wires are the input points of the motor system: red--the input of power supply; ye llow--the output of fg; black--the ground signal. r c is an external pull-up resistance for the use of measuring fg signal. the value of r c can be calculated by the transistor saturation voltage (v on ), sink current (i c ), and off-level voltage (v c ). c on c c i v v r ? = for example: v c =+5v for ttl level; i c = 10ma at 0.2v saturation voltage; the safety value of r c =470 there is a reverse protection diode d1 in the circuit. as if the red and black wires reversely connect with the power source, the current flows through the ground via ic and coils l1 and l2 to power supply. under such kind of circumstances the ic and coils are easy to be burned out. from that, this reverse protection diode is necessary in the design. meanwhile, an extra volta ge drop on the supply voltage should be taken into consideration, which is caused by the reverse protection diode. the capacitor c1 is designed to reduce the ripple nois e during the transient of t he output stages, and its value is determined by the coil impedance and characteristics. r wire b wire +v c r c y wire v cc c1 no so uh477 gnd d1 l1
uh477 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r109-028.a ? functional information h-bridge transistor output in the following figure, the diagram of h-bridge transistors is shown. the single-phase motor rotation is changed by a switching current of coil l1. when the magnetic pole is n pole, q2, q3, q5 is shut of f and q1, q4, q6 is turn-on, the current flows through l1 from so to no. and when the magnetic pole is s po le, q1, q4, q6 is turn-off and q2, q3 is turned on. the current flows through l1 from no to so. utc 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 utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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