Ordering number: ENA2095 LB11970RV Monolithic Digital IC For Fan Motor Single-phase Full-wave Driver http://onsemi.com Overview The LB11970RV is a motor driver of the single phase bipolar drive that a good direct PWM drive of the motor drive efficiency can come true easily. It is most suitable for the power supply fan of the personal computer, CPU air conditioner fan drive. Functions • Single-phase full-wave drive (16V to 1.2A output transistor incorporated) • Variable speed function using thermistor input and external signal incorporated →Enables silent and low-vibration variable speed control through direct PWM control with separately-excited upper Tr • Current limiter circuit (limit at IO=480mA with RL=1Ω connection, the limiter value determined with Rf) • Kick-back absorption circuit incorporated • Low-consumption, low-loss, and low-noise drive enabled by the soft switching circuit during phase shift • Regeneration Di incorporated with less external parts • HB incorporated • Lock protection and automatic reset functions incorporated • RD (Lock detection) output • Thermal shutdown circuit incorporated Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC maximum supply voltage VCC max 17 V VM maximum supply voltage VM max 17 V OUT pin maximum output current IOUT max 1.2 A OUT pin output withstand voltage VOUT max 18 V HB maximum output current HB 10 mA VTH, RMI input pin withstand voltage VTH RMI max 7 V VCC V P-IN input pin withstand voltage VP-IN max RD output pin output withstand voltage VRD max 18 V RD output current IRD max 10 mA Allowable power dissipation Pd max 0.8 W Operating temperature range Topr Specified substrate * -30 to 90 °C Storage temperature range Tstg -55 to 150 °C * Specified substrate: 30mm×30mm×0.8mm, paper phenol. 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 71812 SY 20060927-S00008 No.A2095-1/7 LB11970RV Recommended Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC supply voltage VCC 4.5 to 16 V VM supply voltage VM 3.5 to 16 V VTH, RMI input level voltage range VTH, RMI 0 to 6 V 0 to VCC V P-IN input level voltage range VP-IN Triangular wave input range VRM 0.5 to 4 V Hall input common phase input voltage range VICM 0.2 to 3 V Electrical Characteristics at Ta = 25°C, VCC = 12V, Rf = 0Ω, unless otherwise specified. Parameter Symbol Ratings Conditions min Circuit current typ unit max ICC1 During drive 12 15 18 mA ICC2 During lock protection 11 14 17 mA HB voltage VHB IHB=5mA 1.12 1.22 1.32 V 6VREG voltage V6VREG I6VREG=5mA 5.85 5.95 6.10 V CT pin H level voltage VCTH 3.4 3.6 3.8 V CT pin L level voltage VCTL 1.4 1.6 1.8 V CT pin charge current ICT1 1.8 2.2 2.6 μA CT pin discharge current ICT2 0.18 0.22 0.26 μA CT charge/discharge current ratio RCT 10 12 OUT output L saturation voltage VOL IO=200mA 0.1 0.2 V OUT output H saturation voltage VOH IO=200mA, Rf=1Ω 0.6 0.8 V Current limiter VRF RD output pin L voltage VRD IRD=5mA RD output pin leak current IRDL VRD=18V Overheat protection circuit THD * Design guarantee value 8 480 0.2 180 mV 0.3 V 30 μA °C *: Design target value and no measurement were made. No.A2095-2/7 LB11970RV Package Dimensions unit : mm (typ) 3338 Pd max - Ta 8.0 1.0 Allowable Power Dissipation, Pd max - W 0.5 4.4 10 6.4 18 1 9 0.8 0.3 0.15 0.1 (1.5) 1.7MAX (0.8) Mounted on a board: 30mm×30mm×0.8mm, paper phenol 0.8 0.6 0.4 0.38 0.2 0 -30 -10 10 30 50 70 90 110 Ambient Temperature, Ta - °C SANYO : SSOP18(225mil) Pin Assignment OUT2 1 18 P-GND VM 2 17 OUT1 VCC 3 16 S-GND WH 4 15 6VREG WL 5 14 CT VTH 6 13 IN- RMI 7 12 HB P-IN 8 11 IN+ CPWM 9 10 LB11970RV RD (Top view) PGND: Motor system GND SGND: Control system GND No.A2095-3/7 LB11970RV Equivalent Circuit Diagram RD RMI VTH H: Rotation mode CPWM Thermal shat down L: Regeneration mode P-IN VCC Comparator Current control circuit VM Constant voltage Delay circuit 6VREG HALL Controller 1.25V HB OUT M IN+ Delay circuit IN- OUT Hysteresis AMP Charge/discharge circuit CT SGND Oscillation P-IN RMI VTH WH WL CPWM PGND Truth Table VTH PIN IN- L L H L H L (OPEN) L L H L H L H L OFF L L L H L OFF - H H L - H L H - - H L - - L H H VTH, P-IN = L means VTH, P-IN < CPWM IN+ CT L OUT1 OUT2 RD Mode Running - drive L Running - regeneration OFF L Output regeneration mode L OFF with external signal H OFF L H L OFF L OFF Lock protection VTH, P-IN = H means VTH, P-IN > CPWM No.A2095-4/7 LB11970RV Application Circuit Example Rf *4 CM VCC *2 VM HB *8 IN- H *5 *7 IN+ FG 6VREG *3-3 R6 R4 PIN *3-1 R5 C=2200 to 4700pF R=20 to 50Ω R1 WH PWM-IN R2 OUT1 R3 WL R7 *3-2 RMI RTU OUT2 R8 R1 *3 WH VTH R2 PGND TH CPWM CP=100pF *f=25kHz *1 WL *6 R3 CT CT=0.47 to 1μF SGND No.A2095-5/7 LB11970RV *1. Power supply - GND wiring PGND is connected to the motor power system while SGND is connected to the control circuit power system. Wiring is made separately for PGND and SGND, and external parts of each control system are connected to SGND. *2. Power stabilization capacitor for regeneration CM capacitor is a power stabilizing capacitor for PWM drive and kick-back absorption and has the capacitance of 4.7μF or more. Since this IC performs current regeneration with the lower Tr through switching of the upper Tr, connect CM with the thick and shortest possible pattern between VM and PGND. *3. Setting of the temperature detection variable speed Setting of the triangular wave oscillation voltage The rotation speed variable range for the temperature is set with the triangular wave oscillation voltage. There are two setting methods as follows: 3-1 3-2 The upper voltage (VCPH) of triangular wave is determined by V[voltage of the R1 connection counterpart]× (R2/(R1+R2)) and the lower voltage (VCPL) of triangular wave is determined by V× ((R2//R3) / (R1+R2//R3)). The upper voltage (VCPH) of triangular wave is determined by V× ((R2+R3) / (R1+R2+R3)) and the lower voltage (VCPL) of triangular wave is determined by V× (R2/(R1+R2)). Setting of the thermostat The resistance (RTU from VCC or 6VREG and the voltage generated through division of thermostat (TH) are input in the VTH pin. When the voltage at the VTH pin drops below VCPL due to temperature change, the full speed (thermostat input speed control side only) is obtained. To set the full speed with the thermostat tripping, connect each pin of 3-3 to VCC and each input voltage is generated by divided resistance from VCC. When the thermostat trips and the VTH pin is pulled up to VCC, the full speed (thermostat input speed control side only) is obtained. *4. Setting the current limiter The current limiter is activated when the voltage between current detection resistors exceeds 0.48V between VCC and VM. The current limiter is activated at IO = 480mA when RL = 1Ω. Setting is made with the Rf resistance. Short-circuit VCC and VM when the current limiter is not to be used. When 12V is used, the current limiter must be applied at 1A or less if the coil resistance is 10Ω or less. *5. Hall input Wiring must be as short as possible to prevent carrying of noise. The Hall input circuit is a comparator with hysteresis of 20mV. The Hall input level is recommended to be three times (60mVp-p) or more of this hysteresis. *6. Capacitor to set the PWM oscillation frequency Oscillation with f = 25kHz occurs at CP = 100pF and PWM voltage width of 1.6V, and becomes the reference frequency of PWM. *7. RD output This is the open collector output, the output "H (OFF)" at the time of "L", and a stop at the time of a turn. Keep this output OPEN when not used. *8. HB pin Hall element bias pin, which is a 1.22V constant-voltage output pin *9. RMI pin Minimum speed setting pin for thermostat speed control, which must be pulled up with 6 VREG when not used. By connecting the capacitor, the time to ignore thermostat input at startup can be set. *10. PIN pin Direct PWM speed control pin. Pull down the P-IN input to GND when not using this pin. The lowest output DUTY setting is made with R4 and R5. Keep R5 open for stop with DUTY at 0%. No.A2095-6/7 LB11970RV ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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