unisonic technologies co., ltd UM2640 preliminary cmos ic www.unisonic.com.tw 1 of 8 copyright ? 2011 unisonic technologies co., ltd qw-r109-027.b two-phase unipolar dc brushless motor pre-driver ic ? description utc UM2640 is a 2-phase pre-driver ic for unipolar dc brushes motors. it features high voltage bipola r technology so that the driver works up to 48v. high voltage operation delivers more power and improves power supply efficiency. t herefore, it is suitable for high voltage fan motor applications. ? features * wide supply voltage range of 4v~55v * absolute maximum voltage 60v * lock protection. auto-restart when the motor lock is undone. * lock alarm output terminal ? ordering information ordering number lead free halogen free package packing UM2640l-so8-r UM2640g-so8-r sop-8 tape reel UM2640l-so8-t UM2640g-so8-t sop-8 tube
UM2640 preliminary cmos ic unisonic technologies co., ltd 2 of 8 www.unisonic.com.tw qw-r109-027.b ? pin configuration gnd 1 2 3 4 8 7 6 5 v cc h1 la h2 c t out1 out2 ? pin description pin no. pin name description 1 v cc supply voltage 2 h1 positive input for hall amplifiter 3 la lock alarm output 4 h2 negative input for hall amplifiter 5 gnd ground 6 c t timing capacitance 7 out1 output voltage 8 out2 output voltage
UM2640 preliminary cmos ic unisonic technologies co., ltd 3 of 8 www.unisonic.com.tw qw-r109-027.b ? block diagram
UM2640 preliminary cmos ic unisonic technologies co., ltd 4 of 8 www.unisonic.com.tw qw-r109-027.b ? absolute maximum rating (t a =25c) parameter symbol ratings unit supply voltage v cc 60 v hall input voltage range v ih -0.3~v cc v output current i out 30 ma lock alarm output voltage v ola 60 v hall input differential voltage v ihd 2 v lock alarm output current i ola 20 ma power dissipation p d 375 mw operating temperature t opr -40~85 c storage temperature t stg -55~150 c note: absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (v cc =48v, t a = 25c) parameter symbol test conditions min typ max unit operating supply voltage range v cc 4.0 48.0 55.0 v v cc =24v 3.0 4.0 operating current i cc v cc =48v 3.8 4.8 ma hall input hysterisis range v hys 8 20 32 mv hall amplifier input bias current i b 0.5 1.0 a hall input common mode voltage v icm 1.5 vcc-2 v output voltage v out i out =10ma vcc-1.5 v output leak current i leak v cc =60v 5 a lock alarm output voltage v la lock alarm on, i la =5ma 0.5 v lock alarm leak current i la-leak v la =60v 10 a ct charge current i chg v ct =1.5v 3.8 a ct discharge current i dchg v ct =1.5v 0.75 a charge/discharge current ratio i chg /i dchg 4.0 5.5 8.0 ct h level cense voltage v cth 2.2 2.5 2.8 v ct l level cense voltage v ctl 0.6 0.7 0.8 v auto protection release on time t on c t =0.47f 0.25 s auto protection release off time t off c t =0.47f 1.25 s
UM2640 preliminary cmos ic unisonic technologies co., ltd 5 of 8 www.unisonic.com.tw qw-r109-027.b ? application information the utc UM2640 is a two-phase unipolar dc brushes motor pre-driver ic that features hi gh voltage process technology so that the driver works up to 60v . it is suitable for high voltage fan motor applications where 48v operation is required. [ example of application circuit ] [design notes] above application example is designed for 48v operatio n with motor current of 300ma. it uses the following components: hall elements: hw101a (akd) tr1, tr2: 2sc4027a (utc) 1. design of r4 and r5 b cc i v r ce be v - v - 4 = where; v cc is 48v, vce of utc UM2640 is 1.5v, vbe of tr1 is 0.7v. ib is the base current of tr1. the pull down resistance r5 (connected to tr1) influences turn-off time of tr1. a typical r5 value is ranging from 1k ? to 10k ? . it is highly recommended to determine the value with actual application for better noise performance.
UM2640 preliminary cmos ic unisonic technologies co., ltd 6 of 8 www.unisonic.com.tw qw-r109-027.b ? application information(cont.) 2. design of ra and ca ra and ca must be used if v cc exceeds operating voltage range of utc UM2640 . example of v cc 60v application given that current consumption of utc UM2640 is 4ma (at v cc =48v), ra is given by: ? k 3 = 10 4 48 - 60 = ra 3 - ca is needed if utc UM2640 is oscillated or shows unstable operation. a typical value of ca is from 0.01f to 0.1f. a ceramic type is recommended and it must be placed near v cc and gnd. by insertion of ra and ca,the esd immunity is improved greatly. 3. design of d2 if an application requ ires active power on and off, tr1 (tr2) may be damaged or resulted in destruction. in such application, adding diode between motor winding and gnd will reduce the damage. 4. design of zd1 and zd2 zenner diodes are used for limiting kick back voltage of motor winding generated when power transistors is (tr1 and tr2) turned off from on. there are two methods to consume kick back voltage: 1) inserting zd1 (zenner diode connected between base and collector of tr1) energy of kick back voltage is consumed by tr1 (or tr2). when zd1 is in operation, co llector voltage is sum of vbe and zd1. therefore, breakdown voltage of zd1 must be lower than that of tr1. 2) inserting zd2 (zenner diode connected between collec tor and emitter of tr1) energy of kick back voltage is consumed by zd2. to protect tr1, breakdown volta ge of zd2 must be lower than that of tr1. this method is generally used when energy of kick back volt age is large. in such application, power rating of zd must take in consideration. 5. selection of c1 and d1: c1 is used to weaken noise. a typical value is 0.1uf. optimize the value in actual operating conditions if necessary. d1 is a diod e for protecting against reverse voltage supply. silicon rectifier diode is appropriate. 6. design of r1 and r2 hall amplifier is a differential amplifier with hysteresis characteristics (24mv typical). the common-mode input voltage is between 1.5v and v cc -2v and the input signal must be within the range. non-excitation hall bias voltage is to be set at a half of v cc for effective use of common-mode input voltage range. therefore the same value of hall bias resistors is selected for r1 and r2. the output voltage of hall el ements is effected by the bias current and ma gnetic flux density of hall elements. the optimum input voltage of utc UM2640 is 100mvp-p and higher. with such input voltage, the highest efficiency can be obtained.
UM2640 preliminary cmos ic unisonic technologies co., ltd 7 of 8 www.unisonic.com.tw qw-r109-027.b ? application information(cont.) 7. design of c2: lock protection function, consists of motor lock detecti on and auto resume function, is a safety feature to protect a motor and a driver circuit from fa tal destruction in case of motor halt. motor lock detection detects motor halt due to irregular load conditions and then cuts motor driving current for safety operation. when lock detection is activa ted; lock alert out (la: pin 3) goes to l. a value of c2 determines lock detection time (ton) and auto resume time (toff). lock detection time (ton) is given by: [sec] ic vcl - vch 2 c = t on where c2 is 0.47uf: [sec] 22 . 0 = 10 8 . 3 7 . 0 - 5 . 2 10 47 . 0 = t 6 - 6 - on auto resume time (toff) is given by: [sec] idc vcl - vch 2 c = t off where c2 is 0.47uf: [sec] 13 . 1 = 10 75 . 0 7 . 0 - 5 . 2 10 47 . 0 = t 6 - 6 - off a typical value of c2 is either 0.47uf or 1uf depending on a motor. lock protection lock alert out (la: pin 3) is a open collector output and r3 is a pull up resister. a typical value of r3 is 10k ? . it must be noted that lock alert out stays an h state during few hundred milliseconds from power up as shown in the picture below.
UM2640 preliminary cmos ic unisonic technologies co., ltd 8 of 8 www.unisonic.com.tw qw-r109-027.b 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.
|
