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| 11-MD215 Version Issue Date File Name Total Page : A.001 : 2007-12-07 : SP-MD215-A.001.doc : 10 VCM Driver for Mobile Phone 9 7 1 SILICON TOUCH TECHNOLOGY INC. 9-4F-3, Prosperity Rd I, Science-Based Industrial Park Hsinchu, Taiwan, R.O.C. Tel886-3-5727171 Fax886-3-5727390 SILICON TOUCH TECHNOLOGY INC. 11-MD215 VCM Driver for Mobile Phone General Specifications The 11-MD215 is a 1ch voice coil motor 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 Low supply voltage operation Low saturation voltage Low operating current Zero standby current Low digital pin (PD) control voltage (i.e., VIH = 1.6V @ VDD = 2.8V) Built-in a freewheeling diode Constant current control PWM input control with low input current Ultra-small package (WLCSP, 0.79*1.19*0.5 mm) SP-MD215-A.001 VersionA.001 Page1 SILICON TOUCH TECHNOLOGY INC. Pin Assignment Pin Assignment of WLCSP (0.79*1.19*0.5mm) TOP View Pin NO. 1 2 3 4 5 6 Pin Name VDD IN OUT AGND GND PD Description Power supply pin for controller. Constant current setting pin Motor output pin Analog ground Controller ground Power down. Asynchronous power down signal SP-MD215-A.001 VersionA.001 Page2 SILICON TOUCH TECHNOLOGY INC. Absolute Maximum Ratings (Unless otherwise noted, TA= 25) Characteristic Supply Voltage Input Voltage Maximum output current Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD VIN IOUT PD TOPR TSTG Rating 5.5 VDD+0.4 250 300 -40 ~ 125 -65 ~ 150 Unit V V mA mW C C Electrical Characteristic Item Whole circuits Supply Voltage Supply Current ( IDD ) Power down Input Voltage `H' Input Voltage `L' Input Current `H' Input Current `L' VPDH VPDL IPDH IPDL IOUT VDD ISTB IDD1 (Unless otherwise noted, TA= 25 & VDD = 2.8V, VCM= 28.5 , 460 H ) Sym. Condition Limit Min. 2.0 PD = L (Standby mode) PD = H (Operation mode) Typ. 2.8 0.1 0.6 Max. 5.5 1 1 Unit V A mA VPD = 2.8V(built-in pull low resistor 300k) VPD = 0 V 0.57*VDD -0.4 - 10 - VDD+0.4 0.2*VDD 20 1 V V A A Constant Current Output Terminal Output constant current Output current during PD Saturation Voltage (VOUT->AGND) Output Current Settling Time PD = L IOUT = 80 mA VDD = 2.8V, CL=0.1 F , IOUT = 0 -> 100mA 0.3 20 200 1 0.35 50 mA A V s IOUT,PD VSAT ts SP-MD215-A.001 VersionA.001 Page3 SILICON TOUCH TECHNOLOGY INC. Block Diagram VDD 1 PD 6 IN 2 Level Shift & Pre Driver Output Driver 3 OUT 5 4 GND AGND Application Circuit 1. PWM control V PW M D % x V PW M SP-MD215-A.001 VersionA.001 Page4 SILICON TOUCH TECHNOLOGY INC. Application Notes The 11-MD215 is constant current control for use in Auto-Focus. The range of supply voltage of 11-MD215, VDD is from 2.0V to 5.5V. The 11-MD215 digital control pin, PD, its input range is defined that logic "H" is from 0.57*VDD to VDD+0.4V and logic "L" is from -0.4V to 0.2*VDD. So the digital PD pin is suitable to be controlled by 1.8V ISP. The power down pin (PD) is the enable pin of 11-MD215, which logic high level (PD = H) is for IC operation. On the other hand, its logic low level (PD = L) puts the chip into standby mode for power saving. Internal pull low resistor, 300k, prevents IC from abnormal operation when PD is open. 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 efficiency of power saving, especially in the application of portable device. Constant current operation of 11-MD215 provides the current, which can be evaluated by the formula I = VIN 15 (A) . It is convenient to get constant output current by controlling input dc voltage, VIN. Therefore, by adjusting the resistance of RA, RB, and the capacitance CIN, with appropriately PWM frequency will get the suitable and stable input voltage level, VIN, for setting constant current in the output. In the application circuit diagram, the signal PWM, VPWM, is filtered by a low pass filter which consists of RA, RB, and CIN. The -3dB frequency 3dB and VIN are given by 3dB = 1 ( RA // RB ) CIN (1) VIN = RB D% x VPWM RA + RB (V) , , which D% is the duty ratio of PWM frequency. The corresponding of constant current at the output could be changed by setting different duty ratio of PWM, In order to confirm the accuracy and stable value of constant current, the amount of SP-MD215-A.001 VersionA.001 Page5 SILICON TOUCH TECHNOLOGY INC. -3dB frequency 3dB is suggested lower than the 1/1000 of the PWM frequency. It is shown as follows, 3dB = 1 PWM 1000 (2) The following example explains how to design the low pass filter. For PWM frequency f PWM = 92.8kHz , and desired maximum output constant current, I MAX , is 80mA and VPWM = 2.8V. Please determine CIN, RA and RB. According to equation (1) & (2), we have f3dB = 1 1 = f PWM = 92.8 Hz 2 ( RA // RB ) CIN 1000 By choosing CIN = 0.1uF , we can get ( RA // RB ) = 17.1k . Owing to I MAX = VIN , MAX 15 (A) = RB VDD ( A ) , 15 ( RA + RB ) Then RA = 40k , RB = 30k In order to ensure the stabilization of output current, the compensation capacitance CL is suggested placing in parallel with VCM. The suggestion value of CL is about 0.1~1uF and maybe fine tune depending on the different VCM. It is the sense of frequency response compensation to confirm stability while VCM operating. SP-MD215-A.001 VersionA.001 Page6 SILICON TOUCH TECHNOLOGY INC. LPF Design Look Up Table 1. PWM = 24 KHz VPWM = 2.8V Max. output current I (mA) 70 80 2. PWM = 46 KHz CIN ( F ) RA ( k ) RB ( k ) 0.1 0.1 177 155 106 116 VPWM = 2.8V Max. output current I (mA) 70 80 CIN ( F ) RA ( k ) RB ( k ) 0.1 0.1 92 80 55 60 3. PWM = 92.8 KHz VPWM = 2.8 V Max. output current I (mA) 70 80 CIN ( F ) RA ( k ) RB ( k ) 0.1 0.1 46 40 28 30 SP-MD215-A.001 VersionA.001 Page7 SILICON TOUCH TECHNOLOGY INC. Package Specifications (WLCSP) (size: 0.79*1.19*0.5 mm) E D S L2 e2 A1 SYMBOL A A1 S b D E e1 e2 L1 L2 MIN. 0.445 0.17 0.275 0.24 1.14 0.74 0.170 0.170 DIMENSION (mm) NOM. 0.50 0.20 0.30 0.26 1.19 0.79 0.4 0.4 0.195 0.195 MAX. 0.555 0.23 0.325 0.28 1.24 0.84 0.220 0.220 SP-MD215-A.001 VersionA.001 A L1 e1 b Page8 SILICON TOUCH TECHNOLOGY INC. The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who 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 officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. SP-MD215-A.001 VersionA.001 Page9 |
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