LB1668 ONSEMI | Alldatasheet

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Technical content

Features

  • Output protection Zener diodes with variable breakdown voltages When the Z1 and Z2 pins are open : VOLM = 57V When the Z1 and Z2 pins are shorted : VOLM = 32V An external Zener diode can be connected between Z1 and VCC.
  • Can support both 12V and 24V power supplies by changing an external resistor.
  • Hall elements can be connected directly.
  • 1.5A output current output transistors built in.
  • Built-in rotation detection function that outputs low when driven and high when stopped.
  • Motor lock protection and automatic recovery functions built in.
  • Thermal shutdown function. Monolithic Digital IC 2-Phase Unipolar Brushless Motor Drivers

LB1668, 1668M No.4944-2/8 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum input current I CC max t ≤ 20ms 200 mA Output supply voltage V OUT Internal V Output current I OUT 1.5 A RD/FG flow-in current I RD/IFG 10 mA RD/FG supply voltage V RD/VFG 30 V LB1668M : With specified board* 0.8 W Allowable power dissipation Pd max LB1668 1.1 W Operating temperature Topr -30 to +80 °C Storage temperature Tstg -55 to +150 °C * Specified board : 20mm × 15mm × 1.5mm, glass epoxy Allowable Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit Input current range I CC 6.0 to 50 mA Common-mode input voltage range V ICM 0 to V IN-1.5 V Electrical Characteristics at Ta = 25°C, ICC = 10mA Ratings Parameter Symbol Conditions min typ max Unit VOLM1 Z1, Z2 open 54 57 60 V Output limit voltage VOLM2 Z1, Z2 short 31 33 35 V VO(sat)1 I O = 0.5A 0.95 1.2 V VO(sat)2 I O = 1.0A 1.15 1.5 V Output saturation voltage VO(sat)3 I O = 1.5A 1.4 2.0 V VIN input voltage V IN I CC = 7.0mA 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 V RD(sat) I RD = 5mA 0.1 0.3 V C flow-out current I C1 2.1 3.0 3.9 μA C discharge current I C2 0.31 0.44 0.59 μA VTH1 0.77 0.8V IN 0.83 V Comparator input threshold voltage VTH2 0.42 0.45V IN 0.48 V Thermal shutdown current operating temperature TSD Design target value * 180 °C Thermal shutdown circuit hysteresis ΔTSD Design target value * 40 °C * Design target value and is not measured. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Oper ating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

LB1668, 1668M No.4944-3/8 Pd max -- Ta 0.8 1.0 1.1 0.6 0.4 0.2 1.2 -30 -20 80 6020 400 100 DIP10S (LB1668) MFP14S (LB1668M) Ambient temperature, Ta -- °C Allowable power dissipation, Pd max -- W Specified board : 20×15×1.5mm3 glass epoxy Package Dimensions Package Dimensions unit : mm (typ) unit : mm (typ) 3098D [LB1668] 3111A [LB1668M] Pin Assignment SANYO : DIP10S(300mil) 9.14 0.95 6.4 7.62 3.2 3.9 MAX 0.51 MIN (3.0) 10 6 0.25 0.48(1.01) 1.78 SANYO : MFP14S(225mil) 8.0 0.15 (1.0) 1.0 0.35 1.7MAX (1.5)0.1 4.4 0.63 6.4 VIN RD Z2 Z1 OUT2 IN- IN+ C Top view OUT1 GND LB1668 VIN RD Z2 Z1 OUT2 IN- IN+ C Top view NC OUT1 NC NC NC NC LB1668M

LB1668, 1668M No.4944-4/8 Truth Table IN+ IN - C OUT1 OUT2 RD H L L H L L L H L L H L H L H H H H L H H H H H Block Diagram and Sample Application Circuit L2L1 OUT1 OUT2 10kΩ 0.01pF RD GND0.47 to 10μF Thermal shutdown IN+ VIN IN- C D Constant current circuit Control blockamp H

LB1668, 1668M No.4944-5/8 LB1668M Sample Application Circuits

  • 12V power supply type
  • 24V power supply type
  • Circuit for use when large output currents are required and heat dissipation is high. VIN RD Z2 Z1 OUT2 IN- IN+ C GND OUT1 LB1668M 330Ω VCC 12V 2kΩ 2kΩ 2kΩ 0.47μF 1.2kΩ 0.47μF 0.47μF H + VIN RD Z2 Z1 OUT2 IN- IN+ C GND OUT1 LB1668M VCC 24V H + VIN RD Z2 Z1 OUT2 IN- IN+ C GND OUT1 LB1668M 330Ω (1.2kΩ) VZ = 12V (24V) VCC 12V (24V) H +

LB1668, 1668M No.4944-6/8 Design Documentation (See the sample application circuits) (1) Power supply voltage (VIN pin) The resistor R1 (when VCC = 12V, R1 = 330Ω, and when VCC = 24, R1 = about 1.2kΩ) is inserted between VIN and the power supply VCC pin. When the ICC current is set in the range 6 to 50mA, the VIN pin will be regulated to be 6.7V. Not only does this provide stability with respect to power supply voltage variations and motor kickback, but it also provides adequate strength to withstand surges. (2) Output transistors (OUT1 and OUT2 pins) A Zener diodes with the following characteristics is inserted between the collector and base of each output transistor to absorb kickback voltages at 57V (typical) and provide output protection. Sustained output voltage : V O = 65V minimum (design guarantee) Output current : I O = 1.5A maximum Output saturation voltage : V O sat = 1.25V/1.0A (typical) Safe operating range : I O = 1.0A, VOLM = 57V, t = 200μs (3) Output circuit kickback voltage protection (Z1 and Z2 pins) These ICs support output protection that minimizes kickback noise by changing the kickback absorption voltage and absorption method according to the output current and power supply voltage used. 1) When the Z1 and Z2 pins are shorted The output protection voltage will be 32V (typical) using a VCC = 12V power supply. 2) When the Z1 and Z2 pins are open The output protection voltage will be 57V (typical) using a VCC = 24V power supply. 3) With a Zener diode inserted between Z1 and VCC or between Z1 and ground This technique handles 120mm square H speed applications which require large output currents and involve large amounts of heat generated in the IC by dissipating the motor coil switching loss in external Zener diodes. (4) Output protection when the motor is lock (C and FG pins) This circuit detects motor stopping due to, for example, overloading, and cuts the coil current. It also automatically recovers drive and motor turning from the output stopped state when the load returns to an appropriate level. The lock detection time is set with the value of an external capacitor. When C = 0.47μF Lock detection time : about 1 second Lock protection time (output on) : about 0.5 second (output off) : about 3 seconds The RD pin is an open collector output and outputs a low level during drive and a high level when stopped. (5) Thermal shutdown This circuit turns the output off in response to coil shorting or IC overheating. (6) In applications that use an external transistor to turn the cooling fan power on and off, connect a capacitor of about 0.47 to 10μF between the fan power supply VCC and ground to provide a regenerative route for the fan motor coil current. Fan Regenerative current capacitor External transistor

LB1668, 1668M No.4944-7/8 Automatic Recovery Circuit C-pin Voltage Automatic return circuit C pin voltage 1) While the blades are turning, the capacitor is charged with a current of about 3μA (typical), and C is discharged by pulses that correspond to the motor speed. 2) When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The output is turned off when that voltage reaches 0.8 × VIN. 3) When the output is turned off, the capacitor is discharged at about 0.44μA (typical). When the capacitor voltage falls under VTH2, if the lock state is not yet cleared the capacitor continues discharging until VTH1. (Note that the output is turned on at this time.) 4) If the lock is cleared at the point the capacitor voltage reaches VTH2, motor rotation is started by turning the output on. VTH2 VTH1 23456789 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 t2t1 t (s) VC (V) Output on Lock Output off Output on Rotation Rotation Lock released Output off 0.4 0.8 1.2 1.6 2.0 0.1 1.0 Output current, IO –m A Output saturation voltage, VO(sat) – V 02468 1 0 1 2 Input current, ICC –m A Input voltage, VIN –V 2 100 Collector/emitter voltage, VCE –V Collector current, IC –A VO(sat) – IO ASO VIN – ICC Ta = 80°C Single pulse VIN = 6.7V 300μs 400μs 500μs 200 μs IN+ = L IN - = L C = H

LB1668, 1668M PS No.4944-8/8 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. A listing of SCILLC’s product/patent coverage may be accessed at 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, consequentia l 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 techn ical 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 in systems intended for surgical implant into the body, or other applications intended to support 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 productsfor any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, anddistributors 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 oft h e part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.