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. 新竹市科學園區展業一路九號七樓之一 9-7F-1 Prosperity Road I Science-Based Industrial Park Hsinchu, Taiwan 300, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 點晶科技股份有限公司 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 z PWM fan speed control with adjustable speed curve z Built-in soft-start circuitry to prevent excessive inrush driving current z Directly connectable to a HALL effect sensor z Lock protection and automatic self-restart z Open-drain tachometer signal output z Open-drain lock alarm output z Highly reliable, small package (SSOP-16 ) SP-ST1115J-A.003 Version：A.003 Page：1 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1115J Pin Assignment GND 1 16 PO1 H+ 2 15 VDD H- 3 14 PO2 VF 4 13 CF VM 5 12 RD GND 6 11 FG GND 7 10 PWM VZ 8 9 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 Absolute Maximum Ratings Characteristic 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 ( Unless otherwise noted, VDD=12V, TA = 25 °C ) Symbol Rating Unit Supply Voltage VDD 15 V Input Voltage VIN VDD+0.4 V PO1/PO2 Output Current IOUT 100 mA FG/RD Output Current IFG_RD 10 mA FG/RD Output voltage VFG_RD 15 V Power Dissipation PD 0.68 W Operating Temperature Range TA -40 ~ 125 °C Storage Temperature Range TS -65 ~ 150 °C Operating Junction Temperature TJ 150 °C Thermal Resistance, Junction to Ambient θJA 120 °C/ W Thermal Resistance, Junction to case θJC 52 °C/ W SP-ST1115J-A.003 Version：A.003 Page：2 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ( Unless otherwise noted, VDD=12V, TA = 25 °C ) Electrical Characteristic Characteristic Supply Voltage ST1115J Sym. Condition Min. Limit Typ. Max. Unit VDD Operating 4 12 15 V Quiescent Current IDD No load, All Inputs = 0V or VDD - 5 10 mA H+/H- Common-mode input range VICR - 1 - VDD-1 V H+/H- Hall comparator input offset voltage VIL - -7 - 7 mV H+/H- Hall comparator input bias current IIH - 1 3 μA PO1/PO2 Output Voltage High VOH IOUT = 60mA 11 11.3 - V PO1/PO2 Output Voltage Low VOL IOUT = 60mA - 0.2 0.5 V FG/RD Leakage Current ILeak VRD/FG = 12V - 0.1 5 μA FG/RD output voltage Low VFROL IRD/FG = 5mA - 0.2 0.4 V FG/RD Output Voltage High VFROH - - 15 V PWM Input Voltage Low VPWML VDD= 5V or 12V - 0.4 - 1.0 V PWM Input Voltage High VPWMH VDD= 5V or 12V 2 - VDD+ 0.4 V PWM input bias current IPWM -15 - 1 μA VZ/VM Input bias current Ibias -1 - 1 μA VF Input bias current IbiasF -2 - 2 mA SEL Input Voltage Low VSELL - 0.4 - 0.25*VDD V SEL Input Voltage High VSELH 0.6*VDD - VDD+ 0.4 V SEL Input bias current Ibias -1 - 1 μA On Time TON 400 500 600 ms Duty Ratio RDR 6 7 8 SP-ST1115J-A.003 - TOFF / TON Version：A.003 Page：3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1115J Application Circuit Power System Power FG FG RD RD RVDD VDD R1 *1 HALL H+ Sensor H- PO1 *2 PO2 R2 *3 GND R3 SEL VZ R4 PWM PWM VM CF VF 1μF *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 Version：A.003 Page：4 點晶科技股份有限公司 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 Output Duty (%) 100% 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 Version：A.003 Page：5 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1115J Package Specifications (SSOP-16) 9 16 5.99 3.91 Unit: mm 8 1 0.3Max 0.229 0.254 0.635 0.15 1.5 4.9 1.63MAX 0.635 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 Version：A.003 Page：6