Ordering number : ENA0665 LB11681H Monolithic Digital IC PWM Three-phase Brushless Motor Driver Overview The LB11681H is a three-phase brushless fan motor driver IC. This IC uses a PWM soft switching drive-method (for low-noise drive). Since this IC includes a motor constraint protection circuit necessary for a fan motor system, highly reliable products including this IC can be designed. Also, this IC can be operated with 12V single power supply. Functions • Direct PWM drive • Three-phase full-wave driving method • Soft switching driving • Built-in lock (constraint) protection circuit • Built-in lock (constraint) detection circuit • FG output (provides one Hall effect sensor equivalent FG outputs) • Built-in Forward / Reverse switching circuit • Built-in thermal shut down circuit • Built-in current limitation circuit Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply Voltage VM max 15.0 V Output current IO max 1.3 A Allowable Power dissipation 1 Pd max1 Independence IC 0.8 W Allowable Power dissipation 2 Pd max2 Mounted on a circuit board* 2.0 W Operating temperature Topr -20 to 85 °C Storage temperature Tstg -55 to 150 °C * Mounted on a specified board: 114.3mm×76.1mm×1.6mm, glass epoxy. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 22807 MS IM B8-8366 No.A0665-1/11 LB11681H Recommended Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply Voltage range VM 10 to 14 V FG pin output current VFG 0 to 3.0 mA LD pin output current VLD 0 to 1.0 mA Electrical Characteristics at Ta = 25°C, VM = 12.0V Parameter Symbol Ratings Conditions min Current drain1 IM1 typ VCTL=1.75V and VREF=1.75V Unit max (10.0) mA VR pin VR pin voltage VR 5.0 V Output block Saturated voltage VSAT SOURCE + SINK, IO=0.6A Diode forward voltage VD IO=0.6A PWM frequency fPWM OSC=220pF 60 1.4 2.1 V 1.2 1.6 V 75 90 kHz Hall amplifier Common-mode input range VCM 1.0 4.0 Input off set voltage VHOF -5 5 mV Input current IHIN -3 3 µA Hall minimum input level VHIN Differential input Hysteresis VHYS Sum of upper and lower hysteresis 35 mVp-p 50 6 V mVp-p 15 Current control circuit VCTL input voltage range VCTL VREF input voltage range VCREF Driving gain GDF+L Control start voltage VDS Limiter voltage VRf 0.17 0.21 0.25 V Charge current IIC 3.8 4.1 4.4 µA Discharge current 1 IDC1 2.1 2.4 2.7 µA 3.5 3.9 4.3 mA 0 Linear region 1.5 to 2.0V 0 1.75 0.18 0.21 VREF VR-1 V 3.5 V 0.24 V/V VREF+40 mV LCK pin When the lock protection function is running Discharge current 2 IDC2 Lock detection operation voltage VLDON When a Hall FG is input, VCLK=4 0.70VR 0.85VR V Lock detection release voltage VLDOFF 0.22VR 0.28VR V V F/R pin High level input voltage range VFRH 2.5 VR Low level input voltage range VFRL 0 0.6 V High level input current IFRH VFR=VR 120 300 µA VLDL ILOAD=1mA 0.15 0.4 V VFGL ILOAD=3mA 0.15 0.4 V VH- IH=5mA 1.1 1.5 1.8 V TSD Design target* 150 180 °C ∆TSD Design target* 40 °C LD pin Low level voltage FG output pin Low level voltage Hall bias Minus- side pin voltage Thermal shut down circuit Thermal shut down operation temperature Temperature hysteresis *: Design target value and no measurement was made. No.A0665-2/11 LB11681H Package Dimensions unit : mm (typ) 3233B HEAT SPREADER 15.2 (6.2) 0.65 7.9 10.5 15 (4.9) 28 1 14 0.8 0.25 2.0 0.3 0.1 (2.25) 2.45max (0.8) 2.7 SANYO : HSOP28H(375mil) Pd max - Ta Allowable Power Dissipation, Pd max - W 2.4 Mounted on a specified board: 114.3mm×76.1mm×1.6mm, glass epoxy 2.0 1.6 1.2 0.96 Independent IC 0.8 0.384 0.4 0 -20 0 20 40 60 80 Ambient Temperature, Ta -°C 100 ILB01808 3 4 5 6 7 8 9 10 11 12 13 14 F/R VR NC FG 2 LCK 1 LD NC NC 15 IB SGND 16 PWM HW- 17 VREF HW+ 18 WOUT HV- 19 VCTL HV+ 20 VOUT HU- 21 UOUT 22 NC 23 PGND 24 RF 25 VM 26 NC 27 HB- 28 HU+ Pin Assignment LB11681H Top view No.A0665-3/11 IB HB- HW- HW+ HV- HV+ HU- HU+ F/R HALL BIAS TSD Q MATRIX & LOGIC FG S R LCK PWM OSC LOCK DITECT LD VREF LIM LEVEL SHIFT VR - VCTL SGND PGND RF WOUT VOUT UOUT VM LB11681H Block Diagram + No.A0665-4/11 LB11681H Truth Table Source F/R “L” Sink F/R “H” HU+ HV+ HW+ HU+ HV+ HW+ 1 WOUT→VOUT H H L L L H 2 WOUT→UOUT H L L L H H 3 VOUT→UOUT H L H L H L 4 VOUT→WOUT L L H H H L 5 UOUT→WOUT L H H H L L 6 UOUT→VOUT L H L H L H Sample Application Circuit 3 4 5 6 7 8 9 10 11 12 13 14 F/R VR NC FG 2 LCK 1 LD NC NC 15 IB SGND 16 PWM HW- 17 VREF HW+ 18 WOUT HV- 19 VCTL HV+ 20 VOUT HU- 21 UOUT 22 NC 23 PGND 24 RF 25 VM 26 NC 27 LD HB- 28 HU+ VCTL VREF LB11681H + 12V FG No.A0665-5/11 LB11681H Pin Functions Pin No. Symbol 1 HB- Pin Description Equivalent Circuit Hall bias minus-side bias pin. VR Minus-side bias pin of Hall element is connected with this pin. In addition, connect a bias resistance between Hall element plus-side bias and power supply. 1kΩ 1 3 VM Power supply pin. Connect a capacitor between this pin and GND. 4 RF Pin to detect the output current. VM The drive current is detected by connecting a low-resistance between this pin and GND. 7 UOUT Output pin. 8 VOUT The motor coils are connected with these pins. 9 WOUT 7 8 9 35kΩ 4 5 PGND Output system ground 10 PWM PWM oscillation pin. VR Connect a capacitor between this pin and GND. 1kΩ 10 3kΩ Output drive current adjustment pin. Connect a resistor between this pin and GND. VR 1kΩ IB 40kΩ 11 11 Continued on next page. No.A0665-6/11 LB11681H Continued from preceding page. Pin No. Symbol 13 FG Pin Description Equivalent Circuit FG pulse output pin (Open collector output) VR Provides one Hall effect sensor equivalent FG output) When the FG output is necessary, connect a pullup resistance with this pin. 14 VR 13 Simplified power supply output pin. VM Connect a capacitor between this pin and GND. This pin is connected with power supply of the 10kΩ small signal system circuit in IC. 15 F/R 14 Pin to switch the rotating mode in spindle motor block. VR Do not apply a voltage above the voltage of the VR pin. Switch F / R when the motor has stopped. 40kΩ 40kΩ 15 17 LCK Lock protection circuit timing setting pin. Connect a capacitor between this pin and GND. VR As the capacity increase, the time of lock detection / release setting can be lengthened 1kΩ 17 1kΩ 19 LD Lock detection output pin (Open collector output) The LD output goes to the high level during lock VR protection When LD output is necessary, connect a pull-up resistance with this pin 19 Continued on next page. No.A0665-7/11 LB11681H Continued from preceding page. Pin No. Symbol 20 VREF Pin Description Equivalent Circuit The pin as reference voltage of control amplifier 20 21 VCTL 185kΩ VR 10kΩ Control amplifier input pin VR 300Ω 21 22 SGND 23,24 HW± 25,26 HV± 27,28 HU± Small signal system ground pin Hall input pin VR 24 26 28 300Ω 300Ω 23 25 27 No.A0665-8/11 LB11681H Explanation of LB11681H and External Parts The LB11681H is three-phase brush less fan motor driver IC that can be operated with 12V signal power supply. Since this IC is PWM soft switching drive, it is perfect to operate as high-efficiency motor for a low-noise drive. Also, since this IC incorporates a motor constraint protection function necessary for a fan motor, highly reliable products can be designed. To design the system by using the LB11681H, please develop the system that is obtained sufficient characteristics after reading the following details. 1. Output Drive Circuit The LB11681H is three-phase brush less type fan motor driver. A high-efficiency direct PWM drive method is adopted in this drive. Also, for low-noise drive of motor, 180degrees current-carrying soft switching method is adopted. 2. Hall Amplifier and Bias circuit Since motor driving current depends on the Hall input waveform, the Hall input amplitude should be set to appropriate value. To obtain good driving current, please adjust the bias resistance so that the Hall input amplitude is 100-200mVp-p. When the Hall input amplifier is large, a current-carrying OFF band is made. Connect a Hall bias resistance between the Hall power supply and plus-side of Hall bias. Also, connect the minus-side of the Hall bias with the HB-pin (pin 1) directly. (No bias resistance on the minusSide ). 3. Current Limitation Circuit The LB11681H incorporates the current limitation circuit. The value of control current of the current limitation circuit is determined by I = VRF / Rf. (VRF = 0.21V typical) The current limitation operation, when the voltage of the RF pin (pin 4) exceeds the limiting value, The transistor on the sink-side is turned off. 4. PWM oscillation circuit The PWM frequency of this IC is adjustable by connecting the capacitor between the PWM pin (pin 10) and GND. We recommend the PWM frequency of 50kHz to 100kHz. When the PWM oscillation frequency is too low, the ripple amplitude of the coil current becomes large. Also, when the PWM oscillation frequency is too high, the driving efficiency is reduced. 5. Adjust of the driving current In order to ensure the soft switching, it is necessary to set the driving current value by the best value with inputting a proper the Hall input amplitude. The driving current is set by the IB pin (pin 11). When the value of the IB resistance becomes small, large amounts of the driving current will flow. The constants of reference for the IB resistance and the RF resistance are shown below. RF limited current RF resistance IB constant Controlled gain 0.64(A) 1Ω 3parallel 8.2(kΩ) 0.66(A/V) 0.84(A) 1Ω 4parallel 6.8(kΩ) 0.88(A/V) 1.05(A) 1Ω 5parallel 4.7(kΩ) 1.10(A/V) 1.26(A) 1Ω 6parallel 3.3(kΩ) 1.32(A/V) No.A0665-9/11 LB11681H 6. FG output The FG pin (pin 13) of this IC is the Hall input U-phase comparator output. Also, since the FG pin is a open collector output, please connect a pull-up resistance with this pin. (When the FG output is not used, no a pull-up resistance necessary.) 7. F / R pin (Forward / Reverse) The F/R pin (pin 15) is a pin for the motor rotation direction switching. By switching the input level, the direction of rotation of the motor is switchable. In the high input level, Please do not apply beyond the limits of the voltage of the VR pin (pin 14). Also, carry out switching of forward / reverse when the motor has stopped. 8. Motor Lock Detection Protection Circuit The LB11681H incorporates the lock protection circuit to protect the IC and the system from the motor restrained condition. If the rotor of the brush less motor is not rotated by any reason a certain period of time, the voltage of the LCK pin is rising. And, when the voltage reaches the lock detection operation voltage the motor is judged as a restrained condition. Then, the LD pin output (Lock detection output, pin 19) is changed from low to high. The output transistor becomes a intermittent driving mode at a time. Therefore, the system is protected by suppressing the heat generation of IC. The setting of the lock detection time can be adjusted by connecting the capacitance value between the LCK pin (pin 17) and GND. When the rotor have started, the motor is released from restriction. And, when the motor becomes a normal drive from a intermitted drive, the LD output goes to low. When the motor is rotating, the current (discharged current 2) of one-PWM period is discharged every one-pulse of a Hall FG. In addition, since the LD pin is a open-collector output, please connect a pull-up resistance with the LD pin (When the LD pin is not used, no a pull-up resistance ). The relationship between the average time from the lock protection condition to release of the lock protection condition and the capacity of a LCK capacitor (CLCK) are as follows. The average time from the lock condition (Stopped of the motor) to the operation of the lock protection function = (3.8 - *VLCK ) × CLCKF / 4.1µA The average time from the operation of the lock protection function to release of the lock protection condition = 2.6 × CLCKF / 2.4µA Note : *VLCK is the voltage of the LCK pin. The voltage of the LCK pin changes depending on a rotating speed or the lock protection circuit is nonfunctional. When CLCK is 2.2µF, The average time from the lock condition (Stopped of the motor) to the operation of the lock protection function = 2.0s The average time from the operation of the lock protection function to release of the lock protection condition = 2.4s 9. Control Amplifier The driving current of the LB11681H can be controlled by the difference in voltage (the difference in voltage is shown as “∆CTL” from here.) between the VCTL pin (pin 21) and the VREF pin (pin 20). When ∆CTL increases, the driving current becomes large. Dynamic range of ∆CTL is about 1V, when the voltage of the CTL pin becomes 1V or more, the IC becomes a full-driving state. Also, when “∆CTL is a positive relationship, the output is turned off. No.A0665-10/11 LB11681H 10. Usage Note : As for the GND The frames of center of IC are the power system ground. The power GND and the system GND are set to the lowest potential. As for the bypath capacitor The bypath capacitor between the VM pin and GND must connect as close as possible to the GND pin of IC. As for VM, GND and short-circuit between the outputs. Please avoid the following matters. : - Short between the output pin and the VM pin. - Short between the output pin and GND - Short between the outputs. Also, the IC should be oriented on the board because the IC may be destroyed and may be emitted smoke possibly. 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Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of February, 2007. Specifications and information herein are subject to change without notice. PS No.A0665-11/11