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Features

 Two-speed mode select function requiring less external component additions : Full speed and Low speed. Or, thermistor-controlled continuous variable-speed functi on 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 Monolithic Digital IC Two-Phase Half-Wave Variable Speed Fan Motor Driver PDIP10 / DIP10S (300 mil) [LB1860, LB1861] SOIC14 W / MFP14S (225 mil) [LB1860M, LB1861M]

Parameter Symbol Conditions Ratings Unit Maximum input current ICC max t %20 ms 200 mA Output supply voltage VOUT Internal V Output current IOUT 1.5 A RD flow-in current IRD 10 mA RD supply voltage VRD 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 ICC 6.0 to 50 mA Common-mode input voltage range VICM 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 VOLM 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 VIN 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 IBA –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 IC 2 C=V IN 0.35 0.50 0.65 µA Comparator input threshold voltage V TH 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 IRT VRT = GND –440 –350 –240 µA Rt comparator voltage VRT 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.2

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.3

.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 V

IN – 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 IO = 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.4

LB1860, LB1860M, LB1861, LB1861M www.onsemi.com Package Dimensions unit : mm [LB1860, LB1861] PDIP10 / DIP10S (300 mil) CASE 646AK ISSUE O to

LB1860, LB1860M, LB1861, LB1861M www.onsemi.com Package Dimensions unit : mm [LB1860M, LB1861M] SOIC14 W / MFP14S (225 mil) CASE 751CB ISSUE A SOLDERING FOOTPRINT* NOTE: The measurements are not to guarantee but for reference only. *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. (Unit: mm) 5.70 0.47 1.10 1.00 XXXXX = Specific Device Code Y = Year M = Month DDD = Additional Traceability Data GENERIC MARKING DIAGRAM* *This information is generic. Please refer to device data sheet for actual part marking. XXXXXXXXXX YMDDD to

LB1860, LB1860M, LB1861, LB1861M www.onsemi.com ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A lis ting of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components insystems intended for surgical implant into the body, or other applications intended tosupport or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject t oa l l applicable copyright laws and is not for resale in any manner.

ORDERING INFORMATION

Device Package Shipping (Qty / Packing) LB1860-E PDIP10 / DIP10S (300 mil) (Pb-Free) 50 / Fan-Fold LB1860M-TLM-E SOIC14 W / MFP14S (225 mil) (Pb-Free) 1000 / Tape & Reel LB1860M-TLM-H SOIC14 W / MFP14S (225 mil) (Pb-Free / Halogen Free) 1000 / Tape & Reel LB1861-E PDIP10 / DIP10S (300 mil) (Pb-Free) 50 / Fan-Fold LB1861M-MPB-E SOIC14 W / MFP14S (225 mil) (Pb-Free) 60 / Fan-Fold LB1861M-MPB-H SOIC14 W / MFP14S (225 mil) (Pb-Free / Halogen Free) 60 / Fan-Fold LB1861M-TLM-E SOIC14 W / MFP14S (225 mil) (Pb-Free) 1000 / Tape & Reel LB1861M-TLM-H SOIC14 W / MFP14S (225 mil) (Pb-Free / Halogen Free) 1000 / Tape & Reel † For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://www.onsemi.com/pub_link/Collateral/BRD8011-D.PDF