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11-MD125
Version : A.003 Issue Date : 2004/09/01 Total Page : 12
2 Channel Low Saturation & Constant Current DC Motor Driver
9 4 3 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-MD125
11-MD125
2 Channel Low Saturation & Constant Current DC Motor Driver
General Specifications
The 11-MD125 is a 2-channel DC driver with one channel constant current mode (forward, reverse and stand-by function ) and the other channel saturation mode(forward, reverse, brake and stand-by function). The 11-MD125 is specifically designed for DSC lens shutter (constant current) / iris (saturation voltage) or shutter (constant current) / zoom DC motor (saturation voltage), or other portable devices. The constant current can be varied by an external resistor and two constant current level can be selected through input control pin. Its design is optimized for use in camera solenoid coil and DC motor.
Features and Benefits
Low voltage operation ( VDD Min = VB Min = 2.5V ) Low saturation voltage ( Upper transistor + low transistor residual voltage; 0.4V typ. at 300mA , VDD = VB = 3V) Low input current Constant current control Two constant current level selection Reference Voltage inside (Vref=1.23V) Thermal shutdown protection Thin, highly reliable package (SSOP-20 , TSSOP20)
Pin Assignment
IN1 IN2 IN3 IN4 IN5 IAD VREF HO1 NC CF VB2 SG PG VO1 VO2 IO1 IO2 IM VDD VB1
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Pin NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Pin Name IN1 IN2 IN3 IN4 IN5 IAD VREF HO1 NC CF VB1 VDD IM IO2 IO1 VO2 VO1 PG SG VB2
Description Input pin start constant current mode Input pin that determines forward/reverse mode Holding 1 output pin (output current settling) Input pin that determines DC driving mode Input pin that determines DC driving mode AMP positive input pin Reference voltage output pin Holding 1 output pin (output current settling) No connection Oscillation protech capacitance Power supply pin for constant current output driver Power supply pin for controller. Current sense resistor Current driving 2 Current driving 1 DC driving 2 DC driving 1 Driver ground Controller ground Power supply pin for DC output driver
Absolute Maximum Ratings ( Unless otherwise noted, TA= 25 )
Characteristic Supply Voltage Input Voltage IO Peak Current IODC Current Power Dissipation Operating Temperature Range Storage Temperature Range Symbol VDD VB VIN IOPeak IODC PD TOPR TSTG Rating 5.5 7 VDD+0.4 1.5 0.45 700 -40 ~ 125 -65 ~ 150 Unit V V V A A mW C C
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Electrical Characteristic
(Unless otherwise noted, TA= 25 & VDD = VB = 3V )
Characteristic Sym. VDD VB ISTB Supply Current ( IDD ) IACT1 IACT2 IACT3 Reference Voltage Circuit Reference Voltage HO1 Voltage Vref VHO1 RVREF = 30k, VDD = 3V RHO1 = 30k, VDD = 3V 1.10 1.10 1.23 1.23 1.27 1.27 V V VIN1, IN4, IN5 =L VIN1 =H, VIN4, IN5 =L VIN1 =L, VIN4, IN5 L VIN1 =H, VIN4, IN5 L Condition Limit Min. 2.5 2.5 Typ. 3 3 0.1 0.4 0.2 0.5 Max. 5.5 5.5 1 1 1 1 Unit V V A mA mA mA
Supply Voltage
ENA / IN1 / IN2 / IN3 Input Terminal ( TJ = 25) Input Voltage "H" Input Voltage "L" Input Current "H" Input Current "L" VIH VIL IIH IIL VIN = VDD VIN = 0 V 0.8*VDD -0.4 VDD+0.4 0.2*VDD 5 5 V V A A
IO1 / IO2 Output Terminal ( TJ = 25) Output Current1 Output Current1 Output Voltage (upper + lower) IO1 IO2 VOUT IAD = 0.3V, RIM = 1 IAD = 0.2V, RIM = 1 IOUT = 300 mA 282 188 300 200 0.4 318 212 0.8 mA mA V
VO1 / VO2 Output Terminal ( TJ = 25) Output Voltage (upper + lower)
VOUT
RLoad=10
-
0.4
0.8
V
Thermal Protection Circuit Protection Temperature TTSD VIN1 =H, VIN4, IN5 L 160
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Truth Table
Constant current driving INPUT OUPUT MODE IN1 IN2 IN3 IO1 IO2 HO1 L OFF OFF OFF STANDBY H/L H H/L L/H ON* Shutter (Current 1)* H H/L L H/L L/H OFF* Shutter (Current 2)* - : Don't care *HO1 : ON Output voltage=1.23V (= Vref). : OFF Output = Impendence. *The constant current level is dependent on the connections of external resistors RIM, RA, RB and RC in the block diagram. Saturation voltage driving INPUT OUPUT MODE IN4 IN5 VO1 VO2 L L OFF OFF STANDBY L H L H REVERSE H L H L FOWORD H H H H BREAK : If IN1=L, IN4=L and IN5=L, the driver will be shutdown and Vref become high impedence.
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Block Diagram
0.1F 0.1F
M VO1 VB2 20
10F
M 16 VO2 IO1 15 14 IO2 11 VB1
10F
17
18
PG
13
IM
RIM*
VDD 12
104 103
Controller
CF 10 0.001F
19 TSD
SG
Reference SG Voltage 5 IN5 4 IN4 3 IN3 2 IN2 1 IN1 8 HO1 7 VREF
+6 IAD
RC
RA RB
*The current value can be justified with VIAD divided by RIM . *When IN3 =L, HO1=High Impedance, VIAD= Vref * RB/(RA+RB), and IOUT = VIAD / RIM. *When IN3 =H, HO1=Vref, VIAD=Vref * RB /[( RA // RC)+ RB] , and IOUT = VIAD / RIM
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Application Circuit
For one saturation channel and one fixed constant current channel application, the circuit diagram is suggestion as below.
VB IN1 IN2 IN1 IN2 IN3 IN4 IN5 IAD VB2 SG PG VO1 VO2 IO1 IO2 IM VDD VB1 0.01F 0.1F 0.1F M 0.1F M 10F
IN4 IN5
RA
VREF HO1
RIM
VDD
RB
NC CF 0.01F
* For example, to get constant current output IOUT about 200mA, set RA = 8.2k, RB =1.6k, RIM = 1, thus, VIAD = 1.23/6.125=0.201V and IOUT = 0.201/1 = 201mA.
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For one saturation channel and one constant current channel with two current values application, the circuit diagram is as below.
VB IN1 IN2 IN3 IN4 IN5 IN1 IN2 IN3 IN4 IN5 IAD RC RA VREF HO1 NC RB CF 0.001F VB1 0.01F 0.1F VB2 SG PG VO1 VO2 IO1 IO2 IM VDD RIM VDD 0.1F M 0.1F M 10F
* For example, to get two constant current level IOUT about 200mA or 300mA, set RA = 8.2K, RB=1.6K, RC= 13K, RIM= 1. If IN3=L, VIAD = 1.23/6.125=0.201V and IOUT = 0.201/1 = 201mA. If IN3=H, VIAD = 1.23/4.142=0.297V and IOUT = 0.297/1 = 297mA.
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Application Notes
1. In multiple power supply application, the voltage of VB1 and VB2 can be used at different value. The power supply VB1 is used for constant current channel and VB2 is used for saturation channel. 2. For constant current mode application, Gnd of RIM and PG have better to been connected to Gnd of system power as close as possible, because IOUT is sensitive with VIAD referred to Vref, when large current flowing into SG will result in significant variation of Vref.. The output current is set by IOUT = VIAD / RIM. The VIAD can be set by reference voltage with external serial proportional resistors. 3. The power dissipated by the IC varies widely with the supply voltage, the output current, and loading. It is important to ensure the application does not exceed the allowable power dissipation of the IC package. The recommended motor driver power dissipation versus temperature is depicted as follows:
Power Dissipation-Temperature
800
Power Dissipation ( mW )
700 600 500 400 300 200 100 0 0 25 50 75 100 125
Ambient Temperature ( )
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Package Specifications(SSOP-20)
(20-pin SSOP )
11MD125 xxxxxxxx*
D ZD A E1 E
C
L
* The "xxxxxxxx" on mark is date code and is subject to change.
B
e
A1
SYMBOL A A1 A2 B c D E E1 e L ZD
Dimensions in Millimeter MIN 1.35 0.10 0.20 0.18 8.56 5.79 3.81 0.41 0 NOM 1.63 0.15 8.66 5.99 3.91 0.635 BASIC 0.635 1.4732REF MAX 1.75 0.25 1.50 0.30 0.25 8.74 6.20 3.99 1.27 8
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Package Specifications(TSSOP-20)
11M D 125 XXXXXXXX*
SYMBOL A A1 A2 b C D E E1 e L y
Dimensions in Millimeter MIN 0.05 0.80 0.19 0.09 6.40 6.20 4.30 0.45 0 NOM 1 6.50 6.40 4.40 0.65 0.60 MAX 1.20 0.15 1.05 0.30 0.20 6.60 6.40 4.50 0.75 0.10 8
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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.
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