LB1861

LB1860 SANYO | Alldatasheet

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Variable Speed Fan Motor Driver Overview The LB1860 series ICs are drivers for two-phase unipolar drive DC brushless fan motors. They have functions such as driving, lock protection, restart and speed control. Features and Functions .Two-speed mode select function requiring less external component additions: Full speed and Low speed. Or, thermistor-controlled continuous variable-speed function according to ambient operation temperatures. → Motor starts rotating at a low speed. .Motor lock protection and automatic return circuit built in .Output transistors: Output current IO = 1.5 A, output circuit protection Zener diodes (LB1860: M-Vz = 57 V/ LB1861: M-Vz = 32 V) → Enables low-level noise protection with chip capacitor. .Built-in thermal shutdown circuit .Built-in rotation detect function (Drive mode: ‘‘L’’, Stop mode: ‘‘H’’) .The LB1860 series can be operated from either 12 V or 24 V power supply by changing an external resistor. (Strong protection against power supply surge) .Connectable direct to a Hall element Package Dimensions unit: mm 3098B-DIP10S [LB1860, 1861] SANYO : DIP10S unit: mm 3111-MFP14S [LB1860M, 1861M] SANYO : MFP14S Monolithic Digital IC LB1860,1860M,1861,1861M SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 73096HA(II)/4060TA,TS No.3519-1/6

Parameter Symbol Conditions Ratings Unit Maximum input current I CC max t %20 ms 200 mA Output supply voltage V OUT Internal V Output current I OUT 1.5 A RD flow-in current I RD 10 mA RD supply voltage V RD 50 V Allowable power dissipation Pd1 max 1.1 W Pd2 max Mounted on 20 × 15 × 1.5 mm glass epoxy board (0.8) W Operating temperature Topr –30 to +80 °C Storage temperature Tstg –55 to +125 °C Allowable Operating Rangesa tT a=2 5°C Parameter Symbol Conditions Ratings Unit Input current range I CC 6.0 to 50 mA Common-mode input voltage range V ICM 0t oVIN –1.5 V Electrical Characteristicsa tT a=2 5°C, ICC =1 0m A Parameter Symbol Conditions min typ max Unit Output limiting voltage V OLM 1 LB1860, 1860M: IO = 0.1 A 54 57 60 V LB1861, 1861M: IO = 0.1 A 30 32 34 V Output saturation voltage VO sat1 IO = 0.5 A 0.95 1.2 V VO sat2 IO = 1.0 A 1.15 1.5 V VO sat3 IO = 1.5 A 1.4 2.0 V Input voltage V IN ICC = 7.0 mA 6.4 6.7 7.0 V Amp input offset voltage V OFF –7.0 0 7.0 mV Amp input bias current I BA –250 nA RD output saturation voltage VRD (sat) I RD = 5 mA 0.15 0.3 V C flow-out current I C 1 C = GND 2.7 3.9 5.0 µA C discharge current I C 2 C=V IN 0.35 0.50 0.65 µA Comparator input threshold voltage VTH 1 0.77 0.8 V IN 0.83 V VTH 2 0.44 0.47 V IN 0.50 V Ct discharge voltage Vct 0.18 0.2 V IN 0.22 V Rt input current I RT VRT = GND –440 –350 –240 µA Rt comparator voltage V RT R T = OPEN 0.59 0.62 V IN 0.65 V Thermal protection circuit operating voltage TSD Design target 180 °C Thermal protection circuit hysteresis ΔTSD Design target 40 °C Pin Assignments Top view Top view LB1860,1860M,1861,1861M No.3519-2/6

Block Diagram and Application Circuit Truth Table ( ): LB1860M, 1861M IN+ IN– Ct Rt1 Rt2 CR OUT1 OUT2 RD Mode H L H L — L H L L Full speed L H H L — L L H L Full speed (H) (L) — — (H) (L) (H) (L) (L) (Full speed) (L) (H) — — (H) (L) (L) (H) (L) (Full speed) — — L H L L H H L Low speed ————— HHHH Lock protection Designer’s Notes (1) Variable-speed circuit (Rt and Ct pins) — Refer to the application circuit diagram .The time constant gained by external components C2 and R2 is used to set the length of an ‘off’ operation time period after phase switching. This means that the variable-speed operations can be performed by changing the ‘on’ operation time of each phase through the duty control. .The sawtooth waveform signals are generated by the C2-R2 time constant. The voltage of this signal (Ct pin voltage) increases from 1.3 V to 4.0 V (Vct) at each phase switching. That is, during this period, the driver becomes inactive (t off), in which output circuit is turned off. .If VCC ^4.0 V , the driver IC remains active (ton) until the next phase switching. During this period, output circuit is turned on. .If the active drive time of each phase is assumed to ‘to’, the following relation can be established: to =t off +t on Fixed Rotation speed constant proportional constant t Constant current circuit Output timing control Unit (resistance:Ω , capacitance: F) Figure 1 ( ): MFP14S 0.47 to 10 µ LB1860,1860M,1861,1861M No.3519-3/6

.From this relation, it can be observed that the ‘to’ and ‘ton’ are in proportional relation with each other, and that the ‘ton/to’ equals the ‘on’ time duty. As a result, a certain rotation speed can be fixed despite the fact that rotation speed exclusively depends on each motor. .At the start, the ‘ton’ value becomes longer while the ‘toff’ value remains unchanged. This means that the ‘toff/to’ duty becomes small enough compared to normal rotation mode. Therefore, the same start torque as that of the full speed rotation can be obtained because the ‘on’ operation time duty increases. This enables the motor to start at a very low speed. (2) Supply voltage (V IN pin) .The LB1860 has the internal parallel regulator which supplies power to the Hall amplifier circuit and the control block. Therefore, the driver ICs are not affected by power source fluctuations and kickbacks from the motor. They maintain the stable operations even if noise signals such as surge are generated. .Set the resistance R1 between VCC and VIN so that the ICC current of 6 mA to 50 mA can flow onto the VIN pin within the supply voltage range of a fan motor. .V IN is 6.7 V typ at ICC = 7 mA. .The current flowing into VIN is calculated using the equation shown below. ICC = V CC –V IN .Consideration given to surge voltage .The maximum allowable current at VIN pin is 200 mA. Therefore, the pin is designed to withstand abnormal positive voltage of: (3) Hall input pin voltage (Pins IN–,I N+) .Set the voltage levels of the input pin for the Hall element output and the Hall element output voltage to within the range of 0 V to VIN – 1.5 V . .The gain between the hall input pin and the output pin is 100 dB or greater. The offset voltage of the hall input amp is±7m V , therefore, the hall element output must be set with the offset voltage (±7 mV) considered. (4) Output transistor (Pins OUT1, OUT2) .Output current I O = 1.5 A max .Output saturation voltage V O sat = 1.15 V/1.0 A typ .Output limiting voltage V OLM = 57 V typ (LB1860, 1860M) V OLM = 32 V typ (LB1861,1861M) .Since the LB1860 series have a protect zener diode between collector and base, the kickback voltage induced by the coil is cut at V OLM = 57 V (32 V). When external capacitors are connected between OUT and GND, the capacitance should not exceed 10 µF. (5) Output protection function (C pin) .Capacitor pin used in forming an automatic return circuit. .If rotation is stopped due to overload, the pin voltage level increases and then forces the output to become inactive. In this case, after proper load adjustment, the output returns to the ‘drive’ mode from the ‘stop’ mode automatically. By changing the capacitor value, the lock detect time period can be set. For C marked with 1 µF Lock detect time Approximately 2 sec. Lock protect time (output ON) Approximately 1 sec. (output OFF) Approximately 6 sec. Rotation Output ON Output OFF Output ON Output OFF Rotation Lock Lock release Automatic Return Circuit C Pin Voltage LB1860,1860M,1861,1861M No.3519-4/6

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 July, 1996. Specifications and information herein are subject to change without notice. Number of rotation,n−r p m Ambient temperature, Ta −°C Top Speed LB1860,1860M,1861,1861M No.3519-6/6