Ordering number : ENA1748B LV8805SV Bi-CMOS LSI PC and Server http://onsemi.com Fan Motor Driver Overview The LV8805SV is a motor driver for PC and server fans. Feature • Direct PWM three-phsae sensorless motor driver Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC maximum supply voltage VCC max 16 V VG maximum supply voltage VG max 21 V OUT pin withstand voltage VOUT max 16 V OUT pin maximum output current IOUT max SOFTST pin withstand voltage VSOFTST max UO pin, VO pin, WO pin 1.2 A 6 V V FR pin withstand voltage VFR max 6 PWMIN pin withstand voltage VPWMIN max 6 V FG output pin withstand voltage VFG max 16 V FG pin output current IFG max 5 mA RD output pin withstand voltage VRD max 16 V RD pin output current IRD max 5 mA Allowable Power dissipation 1 Pd max1 Independent IC 0.3 W Allowable Power dissipation 2 Pd max2 Mounted on designated board *1 Operating temperature Topr Storage temperature Tstg *2 0.95 W -40 to +95 °C -55 to +150 °C *1: When mounted on the designated 76.1mm × 114.3mm × 1.6mm, glass epoxy board (single-layer) *2: Do not exceed Tjmax=150°C. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Semiconductor Components Industries, LLC, 2013 May, 2013 92612NK 20120913-S00007/N0211 SY/60910 SY No.A1748-1/9 LV8805SV Allowable Operating Conditions at Ta = 25°C Parameter Symbol VCC supply voltage VCC SOFTST input voltage range FR input voltage range MINSP input voltage range Conditions Ratings Unit 6 to 15 V VSOFTST 0 to VREG V VFR 0 to VREG V VMINSP 0 to VREG V Electrical Characteristics at Ta = 25°C, VCC = 12V, unless otherwise specified Parameter Symbol Ratings Conditions min Circuit current 1 typ Unit max ICC1 2.6 VVG 17 3.6 mA Charge pump block Charge pump output voltage V Regulator block 5V regulator voltage VVREG 4.75 5 5.25 V 1.2 2 Ω Output on resistance Sum of high-/low-side output transistor on Ron (H+L) IO = 0.7A, VCC = 12V, VG = 17V resistance Startup oscillator (OSC) pin OSC pin charge current IOSCC -2.5 μA OSC pin discharge current IOSCD 2.5 μA PWM input (PWMIN) pin High-level input voltage range VPWMINH 2.3 VREG Low-level input voltage range VPWMINL 0 1 V V Range of PWM input frequency fPWMIN 15 60 kHz 2.3 VREG V 0 1 V Forward/reverse switching pin High-level input voltage range VFRH Order of current application : UOUT→VOUT→WOUT Low-level input voltage range VFRL Order of current application : UOUT→WOUT→VOUT FG and RD output pins FG output pin low-level voltage VFG When IO is 2mA FG output pin leak voltage ILFG When VFG is 16V RD output pin low-level voltage VRD When IO is 2mA RD output pin leak voltage ILRD When VRD is 16V VRF Limit current set to 1A when RF is 0.25Ω. 0.25 0.25 0.35 V 1 μA 0.35 V 1 μA 0.275 V V Current limiter circuit Limiter voltage 0.225 0.25 Constraint protection circuit CT pin high-level voltage VCTH 2.25 2.8 2.95 CT pin low-level voltage VCTL 0.43 0.5 0.65 V CT pin charge current ICTC -2.9 -2.5 -2.1 μA CT pin discharge current ICTD 0.21 0.25 0.32 μA ICT charge/discharge ratio RCT 7 10 13 Soft start circuit Soft start releasing voltage VSOFTST 2.5 V SOFTST pin charge current ISOFTST 0.6 μA Thermal protection circuit Thermal protection circuit operating TSD Design target * 150 180 210 °C temperature * : Design target value and no measurement is made. The thermal protection circuit is incorporated to protect the IC from burnout or thermal destruction. Since it operates outside the IC's guaranteed operating range, the customer's thermal design should be performed so that the thermal protection circuit will not be activated when the fan is running under normal operating conditions. No.A1748-2/9 LV8805SV Package Dimensions unit : mm (typ) 3360 Pd max - Ta Allowable power dissipation, Pd max - W 1.2 5.2 0.5 4.4 6.4 20 12 0.5 0.22 0.15 1.5 MAX (1.3) (0.35) Thermal resistance evaluation board : 76.1 x 114.3 x 1.6mm3 glass epoxy 1.0 0.95 0.8 Thermal resistance evaluation board 0.6 0.42 0.4 Independent IC 0.30 0.2 0.13 0 - 40 -20 0 20 40 60 80 100 120 0.1 Ambient temperature, Ta - C SANYO : SSOP20J(225mil) Pin Assignment FG 1 20 SOFTST RD 2 19 PWMIN CT 3 18 F/R OSC 4 GND 5 17 VREG 16 FIL LV8805SV VG 6 15 COMIN CP 7 14 COM CPC 8 13 VCC RF 9 12 UO WO 10 11 VO Top view No.A1748-3/9 LV8805SV Block Diagram FG RD FG CT RD CTOSC VG CPC CP CHARGE PUMP VREG REFOSC VREG PWMIN SENSORLESS LOGIC OSC F/R START OSC PRI DRIVE FIL VCC COMIN SELECTOR COM CURR LIM GND UO VO WO COM RF SOFTST No.A1748-4/9 LV8805SV Pin Function Pin No. 1 Pin name FG Function Equivalent circuit FG pulse output. This pin outputs a Hall 1 sensor system equivalent pulse signal. 2 RD 2 Motor lockup detection output. Output is fixed high when motor is locked up. 3 CT Motor lockup detection time setting. VREG When the motor lockup condition is detected, the protection time period before the protection circuit is activated is set by connecting a cacacitor between this pin and ground. 3 4 OSC Motor startup frequency setting. A capacitor VREG must be connected between this pin and ground. The startup frequency is adjusted by controlling the charge/discharge current and capacitance of the capacitor. 4 5 GND GND pin 6 VG Charge pump step-up voltage output. 7 A capacitor must be connected between this pin and the VCC pin or ground. 7 CP Charge pump step-up pulse output pin. 8 VCC VREG 6 A capacitor must be connected between this pin and the CPC pin (pin 8). 8 CPC Charge pump step-up pin. A capacitor must be connected between this pin and the CP pin (pin 7). 13 VCC Power supply for the IC and motor. 13 Capacitors must be connected between these pins and ground. 12 UO Output pins. Connect these pins to the U, V, 11 VO and W of the motor coil. 10 WO 9 RF Output current detection pins. The drive current is detected by connecting a resistor 12 11 10 9 between these pins and ground. Continued on next page. No.A1748-5/9 LV8805SV Continued from preceding page. Pin No. Pin name Function 14 COM Motor middle point connection. 15 COMIN Motor position detection comparator filter Equivalent circuit VG pin. A capacitor must be connected between this pin and the FIL pin (pin 16). 16 FIL Motor position detection comparator filter 14 pin. A capacitor must be connected between this pin and the COMIN pin (pin 15). 15 16 17 VREG Regulator voltage (5V) output. VCC A capacitor must be connected between these pins and ground. 17 VREF 18 F/R Motor rotation direction switching. A VREG high-level input causes current to flow into Reverse signal the motor in the order of U, V, and W and a low-level input in the order of U, W, and V. Changing the order of current application Forward/reverse switching signal 18 turns the motor in the opposite direction. Forward signal 19 PWMIN PWM signal input pin. VREG "H" The output transistor is turned on by the level voltage input. "L" The output transistor is turned off by the level voltage input, and the motor stops. The speed of the motor is controlled by controlling Duty of the input 19 signal. When the pin opens, the motor becomes all velocities. 20 SOFTST Soft start time setting. VREG The motor can be started smoothly by connecting a capacitor between this pin and ground. 20 No.A1748-6/9 LV8805SV Application Circuit Example *3 VCC UO VG VO CP WO COM CPC COMIN VREG *10 F/R FIL PWMIN PWM Control Signal F=20kHz to 50kHz FG FG PWMIN *11 *11 RD FG *11 CT SOFTST OSC *8 1000pF RF GND *1 *1. Power supply and GND wiring The GND is connected to the control circuit power supply system. *2. Power-side power stabilization capacitor For the power-side power stabilization capacitor, use a capacitor of 10μF or more. Connect the capacitor between VCC and GND with a thick and along the shortest possible route. LV8805SV uses synchronous rectification for high efficiency drive. Synchronous rectification is effective for heat reduction and higher efficiency. However, it may increase supply voltage. If the supply voltage shall increase, make sure that it does not exceed the maximum ratings by inserting a zener diode between power supply and GND. *3. Reverse connection protection diode This diode protects reverse connection. Insert a diode between power supply and VCC pin to protect the IC from destruction due to reverse connection. Connection of this diode is not necessary required. *4. COMIN and FIL pins These pins are used to connect the filter capacitor. The LV8804 uses the back EMF signal generated when the motor is running to detect the information on the rotor position. The IC dertermines the timing at which the output block applies current to the motor based on the position information obtained here. Insert a filter capacitor with a capacitance ranging from (1,000pF to 10,000pF) between the COMIN pin and FIL pin to prevent any motor startup missoperation that is caused by noise. However, care must be taken since an excessively high capacitance will give rise to deterioration in efficiency and delays in the output power-on timing while the motor is running at high speed. Furthermore, connect the capacitor between the COMIN pin and FIL pin as close as possible in order to avoid the effects of noise from other sources. No.A1748-7/9 LV8805SV *5. CT pin This pin is used to connect the lock detection capacitor. The constant-current charging and constant-current discharging circuits inporporated causes locking when the pin voltage reaches 2.5V, and releasing the lock protection when it drops to 0.5V. This pin must be connected to the GND when it is not going to be used. *6. RF pins These pins are used to set the current limit. When the pin voltage exceeds 0.25V, the current is limited, and regeneration mode is established. In the application circuit, this voltage is set in such a way that the current limit will be established at 1A. The calculation formula is given below. RF resistance = 0.25V/target current limit value *7. SOFTST pin This pin is used to set the soft start. By connecting a capacitor between this pin and GND, the motor speed can be increased gradually. When the pin voltage exceeds 2.5V, the soft start is released, and the LV8804V is switched to normal control. If the soft start function is not going to be used, connect the pin to the VREG pin. *8. OSC pin This pin is used to connect the capacitor for setting the startup frequency. A capacitor with a capacitance ranging from about 500pF to 2,200pF (recommendation) must be connected between this pin and GND. The OSC pin determines the motor startup frequency, so be sure to connect a capacitor to it. <How to select the capacitance> Select a capacitance value that will result in the shortest possible startup time for achieving the target speed and produce minimal variations in the startup time. If the capacitance is too high, variations in the startup time will increase; conversely, if it is too low, the motor may idle. The optimum OSC constant depends on the motor characteristics and startup current, so be sure to recheck them when the type of motor used or circuit specifications are changed. *9. VG, CP, and CPC pins These pins are used to connect the capacitors to generate the pre-drive voltage and stabilize the pre-drive power supply. Be sure to connect these capacitors in order to generate the drive voltage for the high-side (upper) output DMOS transistor. *10. VREG pins These are the control system power supply pin and regulator output pin, which create the power supply of the control unit. Be sure to connect a capacitor between this pin and GND in order to stabilize control system operation. Since these pins are used to supply current for control and generate the charge pump voltage, connect a capacitor with a capacitance that is higher than that of the capacitor connected to the charge pump. Both the VREG pins (pins 3 and 4) must be short-circuited on the print pattern. *11. Pin protection resistor It is recommended that resistors higher than 1kΩ are connected serially to protect pins against misconnection such as GND open and reverse connection. No.A1748-8/9 LV8805SV ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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