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| ST1115J Version Issue Date File Name Total Pages : A.003 : 2004/11/05 : SP-ST1115J-A.003.doc :7 Flexible PWM Speed Control Double Coil Brushless DC Motor Pre-Driver SILICON TOUCH TECHNOLOGY INC. 9-7F-1 Prosperity Road I Science-Based Industrial Park Hsinchu, Taiwan 300, R.O.C. Tel886-3-5645656 Fax886-3-5645626 SILICON TOUCH TECHNOLOGY INC. ST1115J Flexible PWM Speed Control Double Coil Brushless DC Motor Pre-Driver General Specifications This IC is a two-phase, DC brushless fan motor pre-drive with pulse-width modulated (PWM) speed control. The fan speed is controlled by the external PWM command, with an adjustable fan speed versus PWM duty cycle relationship. Soft-start circuitry is included to eliminate excessive inrush driving current occurring during the start-up of the fan. Additionally, this device has various functions, such as setting minimum speed, tachometer signal generation, locked-rotor alarm, lock protection and self-restart. Features and Benefits PWM fan speed control with adjustable speed curve Built-in soft-start circuitry to prevent excessive inrush driving current Directly connectable to a HALL effect sensor Lock protection and automatic self-restart Open-drain tachometer signal output Open-drain lock alarm output Highly reliable, small package (SSOP-16 ) SP-ST1115J-A.003 VersionA.003 Page1 SILICON TOUCH TECHNOLOGY INC. ST1115J Pin Assignment GND H+ HVF VM GND GND VZ 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PO1 VDD PO2 CF RD FG PWM SEL Pin Descriptions Pin No. 1, 6, 7 2 3 4 5 8 9 10 11 12 13 14 15 16 Pin Name GND H+ HVF VM VZ SEL PWM FG RD CF PO2 VDD PO1 Signal Type Ground Analog Input Analog Input Analog Input Analog Input Analog Input Digital Input Digital Input Open Drain Open Drain Analog Input Analog Output Power Analog Output Description Ground Hall Input Hall Input Declare for Full duty Declare for Minimum duty Declare for Zero duty GND:Keep minimum speed. VDD:Stop. PWM control input Fan tachometer output Locked-rotor alarm Input noise filtering Output pre-driver 2 Supply voltage Output pre-driver 1 Absolute Maximum Ratings Characteristic Supply Voltage Input Voltage PO1/PO2 Output Current FG/RD Output Current FG/RD Output voltage Power Dissipation Operating Temperature Range Storage Temperature Range Operating Junction Temperature ( Unless otherwise noted, VDD=12V, TA = 25 C ) Symbol Rating Unit VDD VIN IOUT IFG_RD VFG_RD PD TA TS TJ JA JC 15 VDD+0.4 100 10 15 0.68 -40 ~ 125 -65 ~ 150 150 120 52 V V mA mA V W C C C C/ W C/ W Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to case SP-ST1115J-A.003 VersionA.003 Page2 SILICON TOUCH TECHNOLOGY INC. ST1115J Electrical Characteristic Characteristic Supply Voltage Quiescent Current H+/H- Common-mode input range H+/H- Hall comparator input offset voltage H+/H- Hall comparator input bias current PO1/PO2 Output Voltage High PO1/PO2 Output Voltage Low FG/RD Leakage Current FG/RD output voltage Low FG/RD Output Voltage High PWM Input Voltage Low PWM Input Voltage High PWM input bias current VZ/VM Input bias current VF Input bias current SEL Input Voltage Low SEL Input Voltage High SEL Input bias current On Time Duty Ratio ( Unless otherwise noted, VDD=12V, TA = 25 C ) Condition Operating No load, All Inputs = 0V or VDD Min. 4 Limit Typ. 12 5 Max. 15 10 Unit V mA Sym. VDD IDD VICR VIL IIH VOH VOL ILeak VFROL VFROH VPWML VPWMH IPWM Ibias IbiasF VSELL VSELH Ibias TON RDR 1 -7 - 1 11.3 0.2 0.1 0.2 500 7 VDD-1 7 3 0.5 5 0.4 15 1.0 VDD+ 0.4 V mV A V V A V V V V A A mA V V A ms IOUT = 60mA IOUT = 60mA VRD/FG = 12V IRD/FG = 5mA VDD= 5V or 12V VDD= 5V or 12V 11 - 0.4 2 -15 -1 -2 - 0.4 0.6*VDD 1 1 2 0.25*VDD VDD+ 0.4 -1 400 TOFF / TON 6 1 600 8 SP-ST1115J-A.003 VersionA.003 Page3 SILICON TOUCH TECHNOLOGY INC. ST1115J Application Circuit Power System Power FG RVDD RD VDD FG RD R1 *1 HALL Sensor H+ H- PO1 PO2 *3 *2 R2 R3 R4 VM CF VF GND SEL VZ PWM PWM 1F *1, *2, *3 : The Zener diode and capacitors will increase system stability, if required. Figure 1. Typical Relationship of Fan Speed and PWM Duty Cycle Curve Fan Speed (in the percentage of the full speed) 100% RM DM DH PWM Duty Cycle Figure 2. The Fan speed curve with PWM duty cycle. SP-ST1115J-A.003 VersionA.003 Page4 SILICON TOUCH TECHNOLOGY INC. ST1115J Application Notes 1. The fan speed can be controlled by external PWM input signal. The fan speed curve can be adjusted by setting appropriate voltage levels of the pins SEL, VZ, VM and VF. The typical fan speed curve is shown in Figure.2, which indicates that the full speed is achieved when the duty cycle of the PWM is DH (maximum PWM input duty), and RM ratio of the full speed (say, 50%, for example) is achieved when the duty cycle is DM (minimum PWM input duty). As for the duty cycle below DM, the fan will either stop or keep rotating at the constant speed RM ratio of the full speed, depending on the voltage level of SEL (stop when SEL= VDD and keep rotating at a constant speed when SEL=GND). SEL Voltage VDD GND Fan Speed (under the minimum PWM duty) STOP Keep Minimum speed 2. The voltage setting of VZ, VM and VF determine DM, DH and RM. The input voltage of CF pin will determine the fan speed by controlling the duty of output terminals. The setting and relation of control voltage are shown in Figure 3. Voltage of CF v.s. PWM Duty on Output 100% Output Duty (%) VF VM VZ VDD Voltage of CF (Vol.) Figure 3. The relations of the voltage of VZ, VM, VF and PWM duty ratio on output terminal. 3. Roughly, the VZ, VM, VF can be expressed by the following equations: VF = VDD VDD (2 - DMIN ) ; VZ = VM - DMIN VF , where K is constant. (2 - DMAX ) ; VM = K K 1 - DMIN To get motor precision speed curve, the voltage setting of VF, VM and VZ must be refined with fan motor. SP-ST1115J-A.003 VersionA.003 Page5 SILICON TOUCH TECHNOLOGY INC. ST1115J Package Specifications (SSOP-16) 16 9 Unit: mm 3.91 1 0.229 0.635 8 0.3Max 1.63MAX 4.9 1.5 5.99 0.254 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-ST1115J-A.003 0.15 0.635 VersionA.003 Page6 |
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