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| Ordering number: EN2551C Monolithic Digital IC LB1660N, 1661, 1664N, 1665 2-Phase Unipolar Brushless Motor Drivers Applications Package Dimensions unit : mm . 2-phase unipolar brushless motor (ex. DC brushless fan motor) drivers 3001B-DIP8 [LB1661N, 1661] Features and Functions . Output current : 1.5 A . On-chip output protect zener diodes : 60 V (LB1660N, . 1664N)stage withstand voltage: 85 V (LB1661, 1665) . Output hall input amplifier . On-chip protector against lock . On-chip detect pin With lock SANYO : DIP8 unit : mm 3054A-DIP16F [LB1664N, 1665] SANYO : DIP16F SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O1096HA(II) 7037KI/6227TA No.2251-1/9 LB1660N, 1661, 1664N, 1665 Classification The LB1660 series are classified by the package and whether the on-chip output stage zener diode is used or not, as follows. Output stage zener diode With (VZ = 59 V) Without (Vor = 85 V) Package DIP8 (Pd = 1.2 W) DIP16F (Pd = 2.0 W) LB1660N LB1664N LB1661 LB1665 It is recommended to use the LB1661, 1665 in the following cases. 1 A capacitor is connected across the output and GND and the back emf is more than VZ = 59 V 2 External zener diodes are connected to absorb the kickback voltage. Pin Assignments Top view Truth Table IN+ H L H L IN- L H L H CR L L H H OUT1 H L H H OUT2 L H H H No.2551-2/9 LB1660N, 1661, 1664N, 1665 Equivalent Circuit Block Diagram and Sample Application Circuit The LB1661, LB1665 have no output stage protect zener diode. [LB1660N] Absolute Maximum Ratings at Ta = 25C Parameter Maximum input current Output supply voltage Maximum output current Output negative current RD flow-in current RD supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol ICC max VO max IO max IOM IRD VRD Pd max Topr Tstg t % 20 s t % 20 ms Conditions Ratings 200 Internal 1.5 -50 5 30 1.2 -30 to +80 -55 to +125 Unit mA V A mA mA V W C C Allowable Operating Conditions at Ta = 25C Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 7.0 to 50.0 0 to VIN-1.5 Unit mA V No.2551-3/9 LB1660N, 1661, 1664N, 1665 Electrical Characteristics at Ta = 25C Parameter Output limit voltage Output saturation voltage VIN input voltage Amp input offset voltage Amp input bias current RD output saturation voltage Comparator input bias current Comparator input threshold voltage Symbol VOLM VO (sat)1 VO (sat)2 VO (sat)3 VIN Voff IBA VRD (sat) IBC VTH 1 VTH 2 Conditions IO = 1.0 A IO = 0.5 A IO = 1.0 A IO = 1.5 A ICC = 7.0 mA min 56 typ 59 0.95 1.15 1.40 6.7 0 max 63 1.20 1.50 2.00 7.0 +7 0.5 250 0.84 0.64 Unit V V V V V mV nA V nA V V 6.4 -7 -250 IRD = 5 mA 0.76 0.56 0.8VIN 0.6VIN [LB1661] Absolute Maximum Ratings at Ta = 25C Parameter Maximum input current Output supply voltage Maximum output current RD flow-in current RD supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol ICC max VO max IO max IRD VRD Pd max Topr Tstg t % 20 ms Conditions Ratings 200 -0.3 to +83 1.5 5 20 1.2 -30 to +80 -55 to +125 Unit mA V A mA V W C C Allowable Operating Conditions at Ta = 25C Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 7.0 to 50.0 0 to VIN-1.5 Unit mA V Electrical Characteristics at Ta = 25C Parameter Output limit voltage 1 Output limit voltage 2 Output saturation voltage VIN input voltage Amp input offset voltage Amp input bias current Comparator input bias current Comparator input threshold voltage Symbol VOsus VOR VO (sat)1 VO (sat)2 VO (sat)3 VIN Voff IBA IBC VTH Conditions IO = 0.1 A, both VOUT 1, 2 IO = 0 A, both VOUT 1, 2 IO = 0.5 A, both VOUT 1, 2 IO = 1.0 A, both VOUT 1, 2 IO = 1.5 A, both VOUT 1, 2 ICC = 7.0 mA min 65 80 typ max Unit V V V V V V mV nA nA V 6.4 -7 -250 0.95 1.15 1.40 6.7 0 1.20 1.50 2.00 7.0 7 250 0.8VIN No.2551-4/9 LB1660N, 1661, 1664N, 1665 [LB1664N] Absolute Maximum Ratings at Ta = 25C Parameter Maximum input current Output supply voltage Maximum output current Output negative current RD flow-in current RD supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol ICC max VO max IO max IOM IRD VRD Pd max Topr Tstg t % 20 s t % 20 ms Conditions Ratings 200 Internal 1.5 -50 5 30 2.0 -30 to +80 -55 to +125 Unit mA V A mA mA V W C C Allowable Operating Conditions at Ta = 25C Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 7.0 to 50.0 0 to VIN-1.5 Unit mA V Electrical Characteristics at Ta = 25C Parameter Output limit voltage Output saturation voltage VIN input voltage Amp input offset voltage Amp input bias voltage RD output saturation voltage Comparator input bias current Comparator input threshold voltage Symbol VOLM VO (sat)1 VO (sat)2 VO(sat)3 VIN Voff IBA VRD (sat) IBC VTH1 VTH2 Conditions IO = 1.0 A IO = 0.5 A IO = 1.0 A IO = 1.5 A ICC = 7.0 mA min 56 typ 59 0.95 1.15 1.40 6.7 0 0.2 0.76 0.56 0.8VIN 0.6VIN max 63 1.20 1.50 2.00 7.0 +7 0.5 250 0.84 0.64 Unit V V V V V mV nA V nA V V 6.4 -7 -250 IRD = 5 mA [LB1665] Absolute Maximum Ratings at Ta = 25C Parameter Maximum input current Output supply voltage Maximum output current RD flow-in current RD supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol ICC max VO max IO max IRD VRD Pd max Topr Tstg t % 20 ms Conditions Ratings 200 -0.3 to +85 1.5 5 20 2.0 -30 to +80 -55 to +125 Unit mA V A mA V W C C Allowable Operating Conditions at Ta = 25C Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 7.0 to 50.0 0 to VIN-1.5 Unit mA V No.2551-5/9 LB1660N, 1661, 1664N, 1665 Electrical Characteristics at Ta = 25C Parameter Output limit voltage 1 Output limit voltage 2 Output saturation voltage VIN input voltage Amp input offset voltage Amp input bias current Comparator input bias current Comparator input threshold voltage Symbol VOsus VOR VO(sat) 1 VO(sat) 2 VO(sat) 3 VIN Voff IBA IBC VTH Conditions IO =0.1 A, both VOUT 1, 2 IO = 0A, both VOUT -1, 2 IO = 0.5 A, both VOUT 1, 2 IO = 1.0 A, both VOUT 1, 2 IO = 1.5 A, both VOUT 1, 2 ICC = 7.0 mA min 65 80 typ max Unit V V V V V V mV nA nA V 6.4 -7 -250 0.95 1.15 1.40 6.7 0 1.20 1.50 2.00 7.0 +7 250 0.8VIN Allowable power dissipation, Pd max - W Pd max - Ta Ambient temperature, Ta - C [Design Specifications] (1) Supply voltage The hall amp and control block of the LB1660 series are supplied with power from the on-chip parallel regulator. Set the DC resistance R1 across VCC and VIN so that ICC flowing into the VIN pin becomes 7 to 50 mA in the supply voltage range of a fan motor. VIN is 6.7 V typ at ICC = 7 mA. The current flowing into VIN is calculated using the equation shown below. . .............................................. 1 R1 Consideration given to surge voltage The maximum allowable current at VIN pin is 200 mA. Therefore, the design is made so that a surge voltage of positive value calculated using the following equation is allowable in applications where the IC is used. ICC = Vsurge = VIN + R1 x 200 mA .................................... 2 VCC - VIN (2) Hall input offset voltage The gain in transmission from the hall input pin to the output pin is 100 dB or greater. The offset voltage of the hall input amp is 7 mV; therefore, the hall element output must be set with the offset voltage (7 mV) considered. (3) Output transistor Output Current IO = 1.5 A max Output saturation voltage VOsat = 2.0 V/1.5 A When external capacitors are connected to the output stages, the capacitance should not exceed 10 F. Since the LB1660N, 1664N have a protect zener diode across collector and base, the kickback voltage induced by the coil is cut at VOLM = 59 V typ. No.2551-6/9 LB1660N, 1661, 1664N, 1665 (4) Lock detect threshold voltage The LB1660 series have the function to stop the output drive after the lapse of a given period of time when a motor is locked, and period of time can be set by C, R3. The CR pin peripheral equivalent circuit is shown below. The LB1660 series generate the CR pin discharge pulse when the phase changes, (detection of rotation). When a motor is locked (very low rotational speed), the C connected to the CR pin stops discharging and the CR pin voltage rises. When the CR pin voltage exceeds the threshold voltage (VIN x 0.8), the output drive current becomes zero and the output transistor is turned off, and the RD pin output turns from ``L'' to ``H''. The RD pin output is of the open collector type. CR Pin Peripheral Circuit Output transistor drive Discharge pulse 0.8 c VIN CR pin voltage RD pin Motor lock Output off [Setting Method of Lock Detect Time] (1) Generation of discharge pulse Electric charges on C charged through R3 are discharged via route of C r TRr with constant width pulses at each phase change. When a fan has a high rotational speed, a lot of discharge pulses are generated and the CR pin voltage (=VCR) drops. By contrast, when a fan has a low rotational speed, VCR rises and the protector is operated. The discharge pulses are generated by two methods as shown below. 1 Generated internally at the time of phase change. The power transistor base storage time is used for discharge pulses. t = 15 to 30 sec 2 When the kickback voltage induced by L of a motor coil is absorbed by the zener diode across collector and base of the output transistor, this interval of time during which the transistor is turned on is used for discharge pulses. Therefore, the LB1661,1665 or LB1660N, 1664N use external zener diodes and capacitors, discharge occurs with pulses of 1 only and VCR voltage gets higher than the circuit generating discharge pulses of 2 even if the CR time constant is the same. No.2551-7/9 LB1660N, 1661, 1664N, 1665 Output transistor lock Pulse of 1 Pulse of 2 Generation of discharge pulse (2) CR time constant setting method 1 Bias current of CR pin and effect of leakage of C. The value of the charge current at the threshold point is VIN x 0.2/R3. Therefore, this value and the leakage of C must be large enough for the bias current. 2 The CR pin voltage must not exceed 0.6 x VIN (LB1660N, 1664N) or 0.8 x VIN-0.3V (LB1661, 1665), until the normal rotational speed of a fan is reached and while a fan keeps the normal rotational speed; a malfunction may be caused by instantaneous drop of power supply. 3 It should be noted that the CR pin voltage is varied with the combination C and R, even if the CR time constant is the same. The allowable CR setting value is given in the diagram. (3) Restart after lock detection The LB1660 series are so designed that when motor lock VIN - ICC is detected and the output stage transistor is turned off the drive-off state is kept even after motor lock is released. The method of restart is shown below. 1 Turn off the power supply and turn on again. Turn on after the VCR has dropped enough. 2 Set the CR pin voltage to be less than 1 V, and then turn off the power supply in order to cause the lock detect function to return to normal. (The CR pin can be also used to provide on-off control.) Input voltage, VIN - V Current drain, ICC - mA VO (sat) - IO Output saturation voltage, VO(sat) - V t-R Lock protect delay time, t - s Output current, IO - A Resistance, R - No.2551-8/9 LB1660N, 1661, 1664N, 1665 Timing Chart Instantaneous drop of power supply Input voltage, VIN - V Output off Start Normal Time, t - s Lock No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice. No.2551-9/9 |
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