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?I? 9 ? 7 ? 1 silicon touch technology inc . 9-4f-3, prosperity rd i, science-based industrial park hsinchu, taiwan, r.o.c. tel 886-3-5727171 fax 886-3-5727390 11-MD115 version : a.005 issue date : 2006-06-18 file name : sp-md115-a.005.doc total page : 17 vcm driver for mobile phone
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 1 11-MD115 vcm driver for mobile phone general specifications the 11-MD115 is a voice coil mo tor driver which provides a controllable constant current via external pwm input signal control. with miniature package, it is suitable for reduced -space mounting in camera module application and other portable device. features and benefits z low voltage operation z low saturation voltage z low operating current z zero standby current z built-in pull down resistor for pd pin z built-in a freewheeling diode z constant current control z pwm input control wit h low input current z ultra-small package (lfcsp6, 1.6mm*1.4mm*0.425mm) and (wlcsp, 1.5mm*1.0mm*0.5mm) pin assignment pin assignment of lfcsp6 11 - md 115 top view bottom view 11 - md 115 1 3 2 vdd in out 4 5 6 pd gnd im 6 4 5 pd gnd im 3 2 1 vdd in out
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 2 pin descriptions (lfcsp6) pin no. pin name description 1 vdd power supply pin for controller. 2 in constant current setting pin 3 out motor output pin 4 im current sense resistor 5 gnd controller ground 6 pd power down. asynchronous power down signal pin assignment of wlcsp top view wl1 wl2 wl3 wl4 wl5 wl6 pin descriptions (wlcsp) pin no. pin name description wl1 out motor output pin wl2 in constant current setting pin wl3 vdd power supply pin for controller. wl4 pd power down. asynchronous power down signal wl5 vss controller ground wl6 im current sense resistor
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 3 absolute maximum ratings (unless otherwise noted, t a = 25 ) characteristic symbol rating unit supply voltage v dd 5.5 v input voltage v in v dd +0.4 v maximum output current i out 200 ma power dissipation p d 400 mw operating temperature range t opr -40 ~ 125 c storage temperature range t stg -65 ~ 150 c
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 4 electrical characteristic (unless otherwise noted, t a = 25 & v dd = 2.8v) limit item sym. condition min. typ. max. unit whole circuits supply voltage v dd 2.0 2.8 5.5 v i stb pd = l (standby mode) 0.1 5 a supply current ( i dd ) i dd1 pd = h (operation mode) 0.8 1.6 ma power down input voltage ?h? v pdh - 0.8*v dd - v dd +0.4 v input voltage ?l? v pdl - -0.4 - 0.15*v dd v input current ?h? i pdh v pd = v dd =3v - 10 20 a input current ?l? i pdl v pd = 0 v - - 5 a constant current output terminal output constant current i out r s =1.5 a saturation voltage v sat i out = 120 ma - 0.1 0.15 v output current settling time t s vdd = 2.8v, c l =1 f , r s =1.5 28.5 , 460 h ) 200 250 s
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 5 block diagram application circuit 1. pwm control pwm v % pwm dv
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 6 2. pdm control
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 7 application notes z the 11-MD115 is constant current contro l for use in auto-focus. the range of supply voltage of 11-MD115, vdd is from 2.0v to 5.5v. the 11-MD115 digital control pin, pd, its input range is defined that logic ?h? is from 0.8*vdd to vdd+0.4v and logic ?l? is from ?0.4v to 0.2*vdd. the input pin, in, is vcm constant current setting pin. z the power down pin (pd) is the enable pi n of 11-MD115, which logic high level (pd = h) is for ic operation. on the ot her hand, its logic low level (pd = l) puts the chip into standby mode for power saving. therefore, it is easy to switch the working status by controlling pd pin, and it is recommended that keeps pd at low level (pd = l) before operation to reach the maximum efficien cy of power saving, especially in the applicat ion of portable device. z constant current operation of 11-md1 15 provides the current, which can be evaluated by the formula () () a 10* in s v i r = . it is obviously that constant current not only depends on the resistance load on the current sense terminal, im, but the amount of input voltage level, v in . therefore, by adjusting the resistance of r a , r b , and the capacitance c in , with appropriately pwm frequency will get the suitable and stable input voltage level, v in , for setting constant current in the output. z in the application circuit diagram, the signal pwm, v pwm , is filtered by a low pass filter which consists of r a , r b , and c in . the -3db frequency 3 db and v in are given by () 3 1 // db abin r rc = () % v b in pwm ab r vdv rr = + , , which d% is the duty ratio of pwm fr equency. the corresponding of constant current at the output could be changed by se tting different duty ratio of pwm, in order to confirm the accuracy and stable val ue of constant current, the amount of
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 8 -3db frequency 3 db is suggested lower than the 1/100 of the pwm frequency. it is shown as follows, 3 1 100 db pwm ? = z the following example explains how to design the low pass filter. for pwm frequency 20 pwm f khz = , the sense resistance 1.5 s r = , the desired maximum output constant current is 100ma and v pwm = 3v, determine c in , r a and r b . () 3 11 0.2 2 // 100 db pwm abin f fkhz rrc === by choosing 0.1 in cuf = , we can get ( ) // 7.96 ab r rk = . because to () () ,max max a 10* in s v i r = , then ( ) max // 15.9 10 i ab apwm s rr r vk r = = 15.9 b r k = z the accuracy of output constant cu rrent is closely dependent on the pwm frequency. the higher pwm frequency, ther e will be less voltage variation in im pin within the desired constant curr ent. the output sense resistor 1 1.5 1.8 s ror = is recommended to have a better accuracy of output constant current.
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 9 z in order to ensure the stabilizatio n of output current, the compensation capacitance c l is suggested to reserve between the both terminals of vcm. the suggestion value of c l is about 1uf and maybe fine tune depending on the different vcm. it is the sense of frequency response compensation to confirm stability while vcm operating. z suggestion look up table (pwm control) : condition i : pwm freq. = 16 khz, =1.5 im r v pwm = 2.8v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 18.6 21.4 120 0.1 15.5 27.9 v pwm = 3 v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 20 20 120 0.1 16.6 24.9 condition ii: pwm freq. = 20 khz, =1.5 im r vpwm = 2.8v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 14.9 17.1 120 0.1 12.4 22.3
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 10 v pwm = 3 v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 15.9 15.9 120 0.1 13.3 20 condition iii : pwm freq. = 24 khz, =1.5 im r v pwm = 2.8 v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 12.4 14.3 120 0.1 10.3 18.6 v pwm = 3 v max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 13.3 13.3 120 0.1 11 16.6
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 11 z with pdm signal as input, passed thr ough a low pass filter made up by r a , r b , and c in , will essentially get the averaged dc va lue. for the overall 256 steps with duty ratio 50% and pdm base frequency 4.8 pdm f mhz = , the effectively pwm frequency is 18.75 khz. therefore, the parameters, r a , r b , and c in , of lpf corresponding to the effectively pwm frequency will suggest in the following look up table. () 2.6 v , =4.8 , 256 50% 18.75 pp pdm v f mhz and steps with duty khz pwm frequency effectively = =1.5 im r max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 14.7 20 100 0.01 147 200 120 0.1 12.3 27.6 120 0.01 123 276 =1.8 im r max. output current i (ma) c in ( f ) r a ( k ) r b ( k ) 100 0.1 12.3 27.6 100 0.01 123 276 120 0.1 10.2 50.2 120 0.01 102 502
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 12 measurement result in the following, we take some meas ured data as examples to explain the linear relationship between pwm duty and output curr ent. from the measurement result, it appears that the output constant current is highly linear to t he pwm duty ratio. 1. pwm freq. = 16 khz, v pwm = 2.8v, c in = 0.1 f , i max = 100ma. @25 r a = 17.9 k , r b = 21.8 k , r s = 1.55 .
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 13 2. pwm freq. = 24 khz, v pwm = 2.8v, c in = 0.1 f , i max = 100ma. @25 r a = 12.34 k , r b = 14.28 k , r s = 1.55 3. pwm freq. = 24 khz, v pwm =3v, c in = 0.1 f , i max = 100ma. @25 r a = 12.23 k , r b = 13.25 k , r s = 1.55
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 14 package specifications (lfcsp6) a 0.20 a3 a1 6 4 top view b ottom view e2 1 3 d e b 0.20typ l1 1.25 0. 715 typ. d1 e1 6 4 1 3 l e e1 dimension (mm) dimension (mil) symbol min. nom. max. min. nom. max. a - - 0.425 - - 16.7 a1 0.00 0.02 0.05 0 0.8 2 a3 0.127 ref 5 ref b 0.22 0.30 0.38 8.7 11.8 15 d 1.50 1.60 1.70 59.1 63.0 66.9 d1 0.5 0.6 0.7 19.7 23.6 27.6 e 1.30 1.40 1.50 51.1 55.1 59.1 e1 1.00 1.10 1.20 39.4 43.3 47.2 e2 1.30 basic 51.2 basic l 0.25 0.30 0.35 9.8 11.8 13.8 l1 0.05 basic 2.00 basic e 0.50 basic 20.0 basic e1 1.00 basic 39.4 basic y - - 0.08 - - 3
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 15 package specifications (wlcsp) e1 d l1 a2 a a1 dimension (mm) symbol min. nom. max. a 0.45 0.50 0.55 a1 0.08 0.10 0.12 a2 0.37 0.40 0.43 b 0.26 0.28 0.30 d 1.45 1.50 1.55 e 0.95 1.00 1.05 e1 0.48 0.50 0.52 e2 0.48 0.50 0.52 l1 0.22 0.25 0.28 l2 0.22 0.25 0.28
c???? silicon touch technology inc. sp-md115-a.005.doc version a.005 page 16 the products listed herein are designed for or dinary electronic applications, such as electrical appliances, audio-visual equipm ent, communications devices and so on. hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machi nery, nuclear power control systems, disaster/crime-prevention equipment and the like. misusing those products may directly or indirectly endanger human lif e, or cause injury and property loss. silicon touch technology, inc. will not take any responsibilities regarding the misusage of the products m entioned above. anyone w ho purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. silicon touch technology, inc. and its distributors and all their offi cers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such in tention and manipulation.

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