ST1117A/B/C Version Issue Date File Name Total Pages : A.007 : 2004/09/10 : SP-ST1117ABC-A.007.doc :7 Single Coil Brushless DC Motor Drivers ( 1.5 to 8.5 Volts ) 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 ST1117A / ST1117B /ST1117C SILICON TOUCH TECHNOLOGY INC. ST1117A / ST1117B / ST1117C Single Coil Brushless DC Motor Drivers ( 1.5 to 8.5 Volts ) General Specifications The device is a single coil DC brushless motor driver IC with PWM control, lock protection, power polarity reverse protection and frequency generator. The driver is optimal for single coil fan applications with less external components. Features and Benefits z z z z z z z z z Support single-phase full wave Brushless DC Motor Driver Built-in Hall sensor input amplifier Low voltage startup (VDD=1.5V) High output sinking and driving capability Lock detection and automatic self-restart Without external timing capacitor, Reduces the numbers of external component required External PWM control signal input With FG/2 output, suitable for 8-poles fan motor for ST1117A With FG output, suitable for 4-poles fan motor for ST1117B With RD output for ST1117C Thin, compact, highly reliable package (SOT-28) Pin Description NO. NAME O2 1 O1 VSS VDD 2 VSS Ground pin FGR PWM 3 FGR Frequency generator or rotating detector ST1117A : FG/2 ST1117B : FG ST1117C : RD 4 HP Hall sensor in+ 5 HN Hall sensor in- 6 PWM Input pin for PWM Control 7 VDD Power supply pin 8 O2 O1 HP SP-ST1117ABC-A.007 HN DESCRIPTION Output driving & sinking pin Output driving & sinking pin Version：A.007 Page：1 點晶科技股份有限公司 ST1117A / ST1117B /ST1117C SILICON TOUCH TECHNOLOGY INC. Absolute Maximum Ratings ( Unless otherwise noted, TA = 25 °C ) Characteristic Symbol VDD VIN IOUT IOL PD Rating 7.5 VDD+0.4 400 700 350 Unit V V mA mA mW Operating Temperature Range TOPR -40 ~ 125 °C Storage Temperature Range TSTG -65 ~ 150 °C Operating Junction Temperature TJ 125 °C Thermal Resistance, Junction to Ambient θJA 218 °C/ W Supply Voltage Input Voltage from a Hall Effect Latch Output Output Current Output Current at Lock Power Dissipation Notes:* The maximum power supply voltage & output current must be under the allowable package power dissipation. Electrical Characteristics ( TA= 25°C , VDD= 5V ) Characteristic Sym. Supply Voltage Limit Condition VDD Unit Min. Typ. Max. 1.5 5 7.5 V Zero to peak - 7 25 mV Operating HP/HN input Terminal ( TJ = 25℃) Hall input sensitivity VHN PWM input Terminal ( TJ = 25℃) Input Voltage “H” VIH - 0.5*VDD - VDD+0.4 V Input Voltage “L” VIL - -0.4 - 0.15*VDD V Input Current “H” IIH VIN = VDD - - ±1 μA Input Current “L” IIL VIN = 0V - - ±1 mA O1/O2 Output Terminal ( TJ = 25℃) Output Voltage High VOH IOUT = 300 mA 4.6 - - V Output Voltage Low VOL IOUT = 300 mA - - 0.3 V Output Current IOUT RL = 30Ω - 150 - mA FGR Open-Drain Terminal ( TJ = 25℃) Output Leakage Current ILeak VFGR = 5V - - 1 μA Output Current IFGR VFGROL = 0.4V 5 - - mA VFGROL IFGR= 5 mA - - 0.4 V ms Output Voltage Low Automatic Self-Restart Circuit On Time TON - - 175 - Duty Ratio RDR TOFF / TON 6 7 8 SP-ST1117ABC-A.007 Version：A.007 Page：2 點晶科技股份有限公司 ST1117A / ST1117B /ST1117C SILICON TOUCH TECHNOLOGY INC. Truth Table HP HN PWM O1 O2 H L H H L L H H L H - - L OFF OFF Block Diagram & Application Circuit POWER VDD Power FGR Frequency Generator / Rotating Detector FG / RD PWM *1 HALL *2 Sensor HP AMP HN GND Logic Block + DRIVERS - O1 *3 O2 Lock Detector *1, *2, *3 : The Zener diode and capacitors will increase system stability, if required. SP-ST1117ABC-A.007 Version：A.007 Page：3 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ST1117A / ST1117B /ST1117C Application Notes With low voltage start-up feature, the device is operated within wide supply voltage range from 1.5 to 7.5 Volts. The design, specifications and performance have been optimized for 3V and 5V brushless DC motor applications. The output driver node O1/O2 will be “turned to sink/drive” for V(HIN) = logic low. Similarly, the output O1/O2 will be “turned to drive/sink” for V(HIN) = logic high . The FGR pin is an open-drained output. The output frequency is dividing the hall switching frequency with 2 for ST1117A, the same frequency with hall switching for ST1117B, and the rotating detection for ST1117C. With suitable pull up, the fan tachometer output can be used directly with bipolar or MOS logic for motor speed monitoring/control. To get better FG signal output, increasing stability of power system is required. The pull up resistor about 20KΩ is connected to PWM pin. The PWM command is active high. If low acoustic noise is desired, the PWM frequency range below 200Hz or 20KHz ~ 40KHz is recommended. There is no need of external timing capacitor for lock protection and auto-restart function. For 5V application, the drivers will be shut down roughly 1 to 3 seconds after the motor is locked. When the drivers have been shut down, the automatic self-restart circuit will try to power up the drivers every 1 to 3 seconds until lock is released. There is no requirement of protection diode for power reverse fault in normal applications. The power polarity reverse protection circuit is built-in. The capacitor between two ends of coil ( *3 in application circuit) is proposed to connect 0.1μF for PWM application and 1μF for full-speed application. The connection of the capacitor or Zener Diode (*1 in application circuit) between VDD and GND, the capacitor (*2 in application circuit) between two Hall sensor output and the capacitor (*3 in application circuit) between two ends of coil will increase system stability when motor is rotating. SP-ST1117ABC-A.007 Version：A.007 Page：4 點晶科技股份有限公司 ST1117A / ST1117B /ST1117C SILICON TOUCH TECHNOLOGY INC. 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 Power Dissipation (mW) 400 350 300 250 200 150 100 50 0 0 25 50 75 100 125 150 Ambient Temperature ( ℃ ) SP-ST1117ABC-A.007 Version：A.007 Page：5 點晶科技股份有限公司 ST1117A / ST1117B /ST1117C SILICON TOUCH TECHNOLOGY INC. Package Specifications ( SOT-28 ) (8-pin SOT-28 ) C 7Ann* E H L e θ1 D A2 b SYMBOL A A1 Dimensions in Millimeters MIN NOM MAX A A1 1.00 0.00 1.10 － 1.30 0.10 A2 b C D E e 0.70 0.35 0.10 2.70 1.40 － 0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.90 0.50 0.25 3.10 1.80 － H L 2.60 0.37 2.80 － 3.00 － θ1 1° 5° 9° *Note : The “7Ann” is the package marking where the first two characters “7A” are product identification code shown as following table, the last 2 characters "nn" are date code or lot number, and therefore being subject to change. Product Mark(ID + Date Code) ST1117A ST1117B ST1117C 7Ann 7Bnn 7Cnn 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-ST1117ABC-A.007 Version：A.007 Page：6