Ordering number : ENA0608A Monolithic Digital IC LB11850V For Fan Motor Single-Phase Full-Wave Pre-Driver with Speed Control Function Overview The LB11850V is a single-phase bipolar fan motor driver with speed control function that works with a speed feedback signal. A highly efficient, quiet and low power consumption motor driver circuit, with a high speed accuracy and large variable speed can be implemented by adding a small number of external components. This pre-driver is optimal for driving large scale fan motors (with large air volume and large current) such as those used in servers and consumer products. Functions and features • Pre-driver for single-phase full-wave drive →PMOS-NMOS is used as an external power TR, enabling high-efficiency and low-power-consumption drive by means of the low-saturation output and single-phase full-wave drive. • On-chip speed control circuit →The speed control (closed loop control) using a speed feedback signal makes it possible to achieve higher speed accuracy and lower speed fluctuations when supply voltage fluctuates or load fluctuates, compared with an openloop control system. Separately excited upper direct PWM control method is used as the variable-speed control system. • External PWM input or analog voltage input enabling variable speed control →The speed control input signal is compatible with PWM duty ratio or analog voltages. • On-chip soft start circuit • Lowest speed setting pin →The lowest speed can be set with the external resistor. • Current limiter circuit incorporated →Chopper type current limit at start or lock. • Reactive current cut circuit incorporated →Reactive current before phase change is cut to enable silent and low-consumption drive. • Constraint protection and automatic reset functions incorporated • FG (speed detection), RD (lock detection) output • Constant-voltage output pin for hall bias Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. 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. 32207 MS IM 20070301-S00002 / D0606 MH IM 20060619-S00001 No.A0608-1/14 LB11850V Specifications Absolute Maximum Ratings at Ta = 25°C Parameter VCC maximum supply voltage Symbol Conditions Ratings Unit VCC max 18 V OUTN pin maximum output current IOUTN max 20 mA OUTP pin maximum sink current IOUTP max 20 mA OUT pin output withstand voltage VOUT max 18 V HB 10 mA V HB maximum output current CTL, C pin withstand voltage CVI, LIM pin withstand voltage RD/FD output pin output withstand voltage RD/FG output current 5VREG pin maximum output current Allowable power dissipation CTL, C max 7 CVI, LIM max 7 V FG max 19 V FG max 10 mA I5VREG max 10 mA 0.9 W Pd max Mounted on a specified board * Operating temperature range Topr -30 to +95 °C Storage temperature range Tstg -55 to +150 °C Note *1: Mounted on a specified board: 114.3mm×76.1mm×1.6mm, glass epoxy. Note *2: Tj max = 150°C. Use the device in a condition that the chip temperature does not exceed Tj = 150°C during operation. Recommended Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC supply voltage 1 VCC1 VCC pin 5.5 to 16 V VCC supply voltage 2 VCC2 When VCC-5VREG shorted 4.5 to 5.5 V CTL input voltage range VCTL 0 to 5VREG V LIM input voltage range VLIM 0 to 5VREG V VCI input voltage range VCVI 0 to 5VREG V Hall input common phase input voltage VICM 0.2 to 3 V range Electrical Characteristics at Ta = 25°C, VCC = 12V, unless otherwise specified Parameter Symbol Ratings Conditions min Circuit current 5VREG voltage HB voltage typ unit max ICC1 During drive 12 15 mA ICC2 During lock protection 12 15 mA 4.8 5.0 5.2 V 1.05 1.20 1.35 V mV 5VREG VHB I5VREG = 5mA IHB = 5mA Current limiter voltage VLIM 190 210 230 CPWM pin H level voltage VCRH 2.8 3.0 3.2 V CPWM pin L level voltage VCRL 0.9 1.1 1.3 V CPWM pin charge current ICPWM1 VCPWM = 0.5V 24 30 36 µA CPWM pin discharge current ICPWM2 VCPWM = 3.5V 21 27 33 CPWM oscillation frequency FPWM CT pin H level voltage VCTH 2.8 3.0 3.2 CT pin L level voltage VCTL 0.9 1.1 1.3 V CT pin charge current ICT1 VCT = 2V 1.6 2.0 2.5 µA CT pin discharge current ICT2 VCT = 2V 0.16 0.20 0.25 CT pin charge/discharge current ratio RCT ICT1/ICT2 8 10 12 OUTN pin output H voltage VONH IO = 10mA VCC-0.85 VCC-1.0 OUTN pin output L voltage VONL IO = 10mA 0.9 1.0 V OUTP pin output L voltage VOPL IO = 10mA 0.5 0.65 V C = 220pF 30 µA kHz V µA times V Continued on next page. No.A0608-2/14 LB11850V Continued from preceding page. Parameter Symbol Ratings Conditions min Hall input sensitivity VHN unit typ max ±15 ±25 mV 0.15 030 µA 30 µA 0.15 0.30 V 30 µA 0.8 1.1 V 3.2 3.45 3.7 V V IN+, IN- difference voltage (including offset and hysteresis) FG output L voltage VFGL IFG = 5mA FG pin leak current IFGL VFG = 19V RD output L voltage VRDL IRD = 5mA RD pin leak current IRDL VRD = 19V EO pin output H voltage VEOH IEO1 = -0.2mA EO pin output L voltage VEOL IEO1 = 0.2mA RC pin output H voltage VRCH RC pin output L voltage RC pin clamp voltage CTL pin input H voltage VREG-1.2 VREG-0.8 V VRCL 0.7 0.8 1.05 VRCCLP 1.3 1.5 1.7 V VCTLH 2.0 VREG V CTL pin input L voltage VCTLL 0 1.0 V CTL pin input open voltage VCTLO VREG-0.5 VREG V CTL pin H input H current ICTLH VFGIN = 5VREG 10 µA CTL pin L input L current ICTLL VFGIN = 0V -10 0 -120 -90 C pin output H voltage VCH VREG-0.3 VREG-0.1 C pin output L voltage VCL 1.8 2.0 IBLIM -1 LIM pin input bias current LIM pin common phase input voltage range VILIM 2.0 SOFT pin charge current ICSOFT 1.0 SOFT pin operating voltage range VISOFT 2.0 CVI pin input bias current IB(VCI) VIVCI CVI pin common phase input voltage range µA V 2.2 V 1 µA VREG V 1.6 µA VREG V -1 2 µA 2.0 VREG 1.3 CVO pin output H level voltage VOH(VCO) VREG-0.35 VREG-0.2 Output L level voltage VOL(VCO) 1.8 2.0 V V 2.2 V Package Dimensions unit : mm (typ) 3175C Pd max -- Ta 7.8 24 0.5 5.6 7.6 13 12 1 0.65 0.15 1.5max (1.3) 0.22 Mounted on a specified board: 114.3×76.1×1.6mm3,glass epoxy 1.0 0.9 0.8 0.6 0.4 0.2 0 -30 0 30 60 9095 120 Ambient temperature, Ta -- °C 0.1 (0.33) Allowable power dissipation, Pd max -- W 1.2 SANYO : SSOP24(275mil) No.A0608-3/14 LB11850V Pin Assignment OUT2P 1 24 OUT1P OUT2N 2 23 OUT1N VCC 3 22 SGND SENCE 4 21 5VREG CVI 5 20 C CVO 6 19 EO LB11850V CTL 7 18 EI RC 8 17 LIM SOFT 9 16 CT CPWM 10 15 IN+ FG 11 14 HB RD 12 13 INTop view Truth Table Lock protection CPWM = H IN- IN+ H L L CT OUT1P OUT1N OUT2P OUT2N FG Mode L L OFF H L OUT1→2 drive H OFF H L L OFF OUT2→1 drive H L OFF L OFF H L L H OFF H OFF L OFF IN- IN+ OUT1P OUT1N OUT2P OUT2N Mode H L L L OFF H OUT1→2 drive OUT2→1 drive L H Lock protection Speed control CT = L EO L H CPWM H L L H OFF H L L H L OFF L OFF H L H OFF H OFF L Regeneration mode No.A0608-4/14 VCC CTL signal CTL C CVO CVI SOFT LIM RC 5VREG VCC CTL VREF 1shotmulti VREG EI EDEG Thermal shat down FG FG EO IN+ RD HALL HB HallBias CT IN- CPWM Oscillation CONTROL CIRCUIT Discharge circuit SENSE 5VREG GND OUT2P OUT2N OUT1P OUT1N LB11850V Block Diagram ILB01797 No.A0608-5/14 LB11850V Sample Application Circuit *3 1µF/25V Rp=1kΩ (1) (3) (2) (4) 100Ω RF 1µF/25V RFG/RRD= 10kΩ to 100kΩ *2 *9 VCC 5VREG FG *8 RD RC *7 SENSE LIM (1) OUT1P (2) OUT1N LB11850V SOFT CVI CVO (4) OUT2N HB IN- CTLsignal (3) OUT2P C IN+ CTL CT *4 H *5 CT=1µF EI EO CPWM SGND *6 CP=220pF 30kHz *1 No.A0608-6/14 LB11850V Description of Pre-driver Block *1: <Power supply-GND wiring> SGND is connected to the control circuit power supply system. *2: <Power stabilization capacitor> For the signal-side power stabilization capacitor, the capacitance of more than 0.1µF is used. Connect the capacitor between VCC and GND with the thick pattern and along the shortest route. *3: <Power-side power stabilization capacitor> For the power-side power stabilization capacitor, the capacitance of more than 0.1µF is used. Connect the capacitor between power-side power supply and GND with the thick pattern and along the shortest route. *4: <IN+, IN- pins> Hall signal input pins Wiring needs to be short to prevent carrying noise. If noise is carried, insert a capacitor between IN+ and IN-. The Hall input circuit is a comparator having a hysteresis of 15mV. It has a ±30mV (input signal difference voltage) soft switch zone. It is recommended that the Hall input level is 100mV (p-p) at the minimum. *5: <CPWM pin> This is the pin to connect capacitor for generating the PWM basic frequency Use of CP = 220pF produces oscillation at the frequency of 30kHz which serves as the PWM basic frequency. Since this pin is also used for the current limiter reset signal, the capacitor must be connected without fail even when no speed control is implemented. *6: <CT pin> This is the pin to connect capacitor for lock detection Constant-current charging and constant-current discharging circuits are incorporated. When the pin voltage becomes 3.0V, the safety lock is applied, and when it lowers to 1.0V, the lock protection is reset. Connect this pin to GND when it is not in use (when lock protection is not required). *7: <SENSE pin> This is the pin for current limiter detection When the pin voltage exceeds 0.21V, current limiting is applied, and the low-side regeneration mode is established. Connect this pin to GND when it is not in use. *8: <RD pin> Lock detection pin This is the open collector output, which outputs “L” during rotation and “H” at stop. This pin is left open when it is not in use. *10: <FG pin> Speed detection pin. This is the open collector output, which can detect the rotation speed using the FG output according to the phase change. This pin is left open when it is not in use. No.A0608-7/14 LB11850V Description of Speed Control Block 1) Speed control diagram The speed slope is determined by the constant of the RC pin. (RPM) CR time constant large CR time constant small Rotation speed Minimum speed Determined by LIM pin voltage Small ← CTL signal (PWMDUTY) → Large 0% 100% Large ← EO pin voltage (V) → Small Minimum speed setting rotation Variable speed ON-Duty small Full speed ON Duty large CTL pin 5VREG LIM voltage EO pin EO voltage 0V 2) Timing at startup (soft start) VCC pin CTL pin Stop Full speed Soft start The slope changes according to the capacitance of SOFT pin. (Large → Large slope) SOFT pin Stop Full speed No.A0608-8/14 LB11850V 3) Additional description of operations The LB11850 forms a feedback loop inside the IC so that the FG period (motor speed) corresponding to the control voltage is established by inputting the duty pulse. LB11850V FG Pre-driver block Speed control block CTL CTL signal Closed Feed-back Loop CONTROL SIGNAL The operation inside the IC is as follows. Pulse signals are created from the edges of the FG signals as shown in the figure below, and a waveform with a pulse width which is determined by the CR time constants and which uses these edges as a reference is generated by a one-shot multivibrator. These pulse waveforms are integrated and the duty ratio of the pre-driver output is controlled as a control voltage. FG EDGE pulse Slope due to CR time constant RC pin 1 shot output TRC(s) = 1.15RC Furthermore, by changing the pulse width as determined by the CR time constant, the VCTL versus speed slope can be changed as shown in the speed control diagram of the previous section. However, since the pulses used are determined by the CR time constant, the variations in CR are output as-is as the speed control error. No.A0608-9/14 LB11850V 4) Procedure for calculating constants <RC pin> The slope shown in the speed control diagram is determined by the constant of the RC pin. (RPM) Motor at maximum speed 0% CTL Duty(%) 100% (1) Obtain FG signal frequency fFG (Hz) of the maximum speed of the motor. (With FG2 pulses per rotation) fFG (Hz) = 2 rpm/60 .... <1> (2) Obtain the time constant which is connected to the RC pin. (Have “DUTY” (example: 100% = 1.0, 60% = 0.6) serve as the CTL duty ratio at which the maximum speed is to be obtained.) R×C = DUTY/(3.3×1.1×fFG) .... <2> (3) Obtain the resistance and capacitance of the capacitor. Based on the discharge capacity of the RC pin, the capacitance of the capacitor which can be used is 0.01 to 0.015µF. Therefore, find the appropriate resistance using equation <3> or <4> below from the result of <2> above. R = (R×C)/0.01µF .... <3> R = (R×C)/0.015µF .... <4> The temperature characteristics of the curve are determined by the temperature characteristics of the capacitor of the RC pin. When temperature-caused fluctuations in the speed are to be minimized, use a capacitor with good temperature characteristics. No.A0608-10/14 LB11850V <CVO, CVI pins> These pins determine the position of the slope origin. (When the origin point is at (0%, 0 rpm), CVO and CVI are shorted.) (1) Movement along the X-axis (resistance divided between CVO and GND) (RPM) Motor at maximum speed Move in the direction of the X-axis 0% CTL Duty(%) 100% (Example) In the case where the characteristics change from ones with the origin point (0%, 0 rpm) to ones where the speed at a duty ratio of 30% becomes the speed at 0%: First, obtain the input voltage of the CVI pin required at 0%. CVI = 5-(3×duty ratio) = 5-(3×0.3) = 5-0.9 = 4.1V Next, obtain the resistances at which the voltage becomes 4.1V by dividing the resistance between CVO and GND when CVO is 5V. The ratio of CVO-CVI: CVI-GND is 0.9V: 4.1V = 1: 4.5. Based on the above, the resistance is 20kΩ between CVO and CVI and 91kΩ between CVI and GND. Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 4.5, the slope is now 4.5/5.5 = 0.8 times what it was originally.) If necessary, change the resistance of the RC pin, and adjust the slope. LIM SOFT VREF CVI R4 CVO R5 C CTL CTL No.A0608-11/14 LB11850V (2) Movement along the Y-axis (resistance divided between CVO and VCC) (RPM) Motor at maximum speed Move in the direction of the Y-axis 0% CTL Duty(%) 100% (Example) In the case where the characteristics change from ones with the origin point (0%, 0 rpm) to ones where the speed at a duty ratio of 25% becomes 0 rpm: First, obtain the CVO pin voltage required for the CVI voltage to be 5V at 25%. CVO = 5-(3×duty ratio) = 5-(3×0.25) = 5-0.75 = 4.25V With CVO = 4.25V, find the resistances at which CVI = 5V. The ratio of CVO-CVI: CVI-GND is 0.75V: 7V = 1: 9.3 Based on the above, the resistance is 20kΩ between CVO and CVI and 180kΩ between CVI and VCC. (Due to the current capacity of the CVO pin, the total resistance must be set to 100kΩ or more.) Furthermore, the slope changes. (In the case of the example given, since the resistance ratio is 1: 9.3, the slope is now 9.3/10.3 = 0.9 times what it was originally.) If necessary, change the resistance of the RC pin, and adjust the slope. VCC LIM VREF R5 SOFT R4 CVI CVO C CTL CTL No.A0608-12/14 LB11850V <LIM pin> The minimum speed is determined by the voltage of the LIM pin. (RPM) Maximum speed 10000 8000 6000 4000 Minimum speed setup 2000 0% 5V CTL Duty(%) 100% 2V CVO pin voltage (V) (1) Obtain the ratio of the minimum speed required to the maximum speed. Ra = Minimum speed/maximum speed .... <1> In the example shown in the figure above, Ra = minimum speed/maximum speed = 3000/10000 = 0.3. (2) Obtain the product of the duty ratio at which the maximum speed is obtained and the value in equation <1>. Ca = Duty ratio at maximum speed×Ra .... <2> In this example, Ca = duty ratio at maximum speed×Ra = 0.8×0.3 = 0.24. (3) Obtain the required LIM pin voltage. LIM = 5-(3×Ca) .... <3> In this example, LIM = 5-(3×Ca) = 5-(3×0.24) ≈ 4.3V. (4) Divide the resistance of 5VREG, and generate the LIM voltage. In this example, the voltage is 4.3V so the resistance ratio is 1: 6. The resistance is 10kΩ between 5VREG and LIM and 62kΩ between LIM and GND. 5VREG LIM SOFT VREF CVI No.A0608-13/14 LB11850V <C pin> In order to connect a capacitor capable of smoothing the pin voltage to the C pin, the correlation given in the following equation must be satisfied when f (Hz) serves as the input signal frequency of the CTL pin. (R is contained inside the IC, and is 180kΩ (typ.).) 1/f = t < CR The higher the capacitance of the capacitor is, the slower the response to changes in the input signal is. 5VREG Connect a capacitor capable of smoothing the pin voltage 1/f = t < CR CTL pin input inverted waveform (same frequency) C pin CTL pin CTL circuit 180kΩ VREF circuit SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. 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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 March, 2007. Specifications and information herein are subject to change without notice. PS No.A0608-14/14