Ordering number : EN*4944 Monolithic Digital IC LB1668, 1668M, LB1667, 1667M Two-Phase Unipolar Drive Brushless Motor Drivers Preliminary Overview Package Dimensions The LB1668 Series are 2-phase unipolar drive brushless motor drivers that feature a wide usable voltage range and a minimal number of required external components. They also support the formation of motor lock protection and automatic recovery circuits. unit: mm 3098B-DIP10S [LB1668, 1667] Functions and Features • Output protection Zener diodes with variable breakdown voltages — When the Z1 and Z2 pins are open: VOLM = 57 V — When the Z1 and Z2 pins are shorted: VOLM = 32 V — An external Zener diode can be connected between Z1 and VCC. • Can support both 12-V and 24-V power supplies by changing an external resistor. • Hall elements can be connected directly. • 1.5-A output current output transistors built in • Built-in rotation detection function that outputs low when driven and high when stopped (LB1668/M) • FG signal function that sets FG high when IN- is low, and sets FG low when IN- is high (LB1667/M) • Motor lock protection and automatic recovery functions built in • Thermal shutdown function SANYO: DIP10S unit: mm 3111-MFP14S [LB1668M, 1667M] SANYO: MFP14S Specifications *: These specifications are subject to change for improvement without notice. Absolute Maximum Ratings at Ta = 25°C Parameter Maximum input current Symbol ICC max Conditions t ≤ 20 ms Ratings 200 Unit mA Output voltage VOUT Internal V Output current IOUT 1.5 A Output minus current IOM –50 mA RD/FG influx current IRD/IFG 10 mA 30 V 0.8 W RD/FG voltage VRD/VFG Allowable power dissipation Pd max LB1667M, 1668M: Mounted on a printed circuit board (20 × 15 × 1.5 mm3, glass epoxy) 1.1 W Operating temperature Topr LB1667, 1668 –30 to +80 °C Storage temperature Tstg –55 to +150 °C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 13097HA (OT) No. 4944-1/7 LB1668, LB1668M, LB1667, LB1667M Allowable Operating Ranges at Ta = 25°C Parameter Symbol Input current range Conditions Ratings ICC Common-mode input voltage range Unit 6.0 to 50 VICM mA 0 to VIN –1.5 V Electrical Characteristics at Ta = 25°C, ICC = 10 mA Parameter Symbol Output limit voltage Output saturation voltage VIN voltage Amplifier input offset voltage RD/FG output saturation voltage Ratings min Z1, Z2 open 54 57 60 Z1, Z2 short 31 33 35 V Vosat1 IO = 0.5 A 0.95 1.2 V Vosat2 IO = 1.0 A 1.15 1.5 V Vosat3 IO = 1.5 A 1.4 2.0 V 6.4 6.7 7.0 V VOFF –7.0 0 +7.0 mV IBA –250 0.1 0.3 V 3.0 3.9 µA ICC = 7.0 mA IC1 C discharge current Comparator input threshold voltage Thermal shutdown current operating temperature Thermal shutdown circuit hysteresis Unit max VOLM2 VRDsat/VFG sat IRD/IFG = 5 mA C outflow current typ VOLM1 VIN Amplifier input bias current Conditions 2.1 V nA IC2 0.31 0.44 0.59 µA VTH1 0.77 0.8VIN 0.83 V VTH2 0.42 0.45VIN 0.48 V TSD Design target value 180 °C ∆TSD Design target value 40 °C Block Diagram and Application Circuit Truth Table (LB1667, LB1667M) Pin Assignments IN+ IN– C OUT1 OUT2 FG H L L H L H L H L L H L H L H H H H L H H H H H Truth Table (LB1668, LB1668M) 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 No. 4944-2/7 LB1668, LB1668M, LB1667, LB1667M LB1668M Application Circuits • 12-V power supply type • 24-V power supply type • Circuit for use when large output currents are required and heat dissipation is high. No. 4944-3/7 LB1668, LB1668M, LB1667, LB1667M LB1667M Application Circuits • 12-V power supply type • 24-V power supply type • Circuit for use when large output currents are required and heat dissipation is high. No. 4944-4/7 LB1668, LB1668M, LB1667, LB1667M Design Documentation (See the application circuit diagrams) 1. Power-supply voltage (VIN pin) The resistor R1 (when VCC = 12 V R1 = 330 Ω, and when VCC = 24 R1 = about 1.2 kΩ) is inserted between VIN and the power supply VCC pin. When the ICC current is set in the range 6 to 50 mA, the VIN pin will be regulated to be 6.7 V. 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 57 V (typical) and provide output protection. Sustained output voltage : VO = 65 V minimum (design guarantee) Output current : IO = 1.5 A maximum Output saturation voltage : VO sat = 1.25 V/1.0 A (typical) Safe operating range : IO = 1.0 A, VOLM = 57 V, t = 200 µs 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. — When the Z1 and Z2 pins are shorted The output protection voltage will be 32 V (typical) using a VCC = 12 V power supply. — When the Z1 and Z2 pins are open The output protection voltage will be 57 V (typical) using a VCC = 24 V power supply. — With a Zener diode inserted between Z1 and VCC or between Z1 and ground This technique handles 120 mm 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, RD, 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 = 0.47 µF Lock detection time: about 1 second Lock protection time (output on): about 0.5 second (output off): about 3 seconds The RD pin (LB1668) is an open collector output and outputs a low level during drive and a high level when stopped. The FG pin (LB1667) is an open collector output and is switched between high and low by the drive phase. It goes to the high level when the motor is 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 10 µF between the fan power supply VCC and ground to provide a regenerative route for the fan motor coil current. No. 4944-5/7 LB1668, LB1668M, LB1667, LB1667M Automatic Recovery Circuit C-Pin Voltage 1. While the blades are turning, the capacitor is charged with a current of about 3 µA (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 0.44 µA (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.) These operations, i.e. items 2. and 3., are repeated with a ton:toff ratio of about 1:6 to protect the motor. 4. If the lock is cleared at the point the capacitor voltage reaches VTH2, motor rotation is started by turning the output on. No. 4944-6/7 LB1668, LB1668M, LB1667, LB1667M ■ 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: ➀ 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: ➁ 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 January, 1997. Specifications and information herein are subject to change without notice. No. 4944-7/7