CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers Package Dimensions 8 14 4.4 Functions and Features 1 7 0.15 1.5 8.0 0.1 • 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 (CMD1668M) • FG signal function that sets FG high when IN- is low, and sets FG low when IN- is high (CMD1667M) • Motor lock protection and automatic recovery functions built in • Thermal shutdown function 0.625 [CMD1668M, 1667M] 5.15 6.4 The CMD1668M Series are 2-phase unipolar drive brushless unit: mm 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. 1.8max Overview 0.35 1.0 1.0 SOP-14 * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 1 of 9 Rev 1.0 Aug. 23,2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum input current Symbol ICC max Conditions Ratings t ≤ 20 ms Unit 200 mA Output voltage VOUT Internal Output current IOUT 1.5 A Output minus current IOM –50 mA IRD/IFG 10 mA VRD/VFG 30 V 0.8 W RD/FG influx current RD/FG voltage Allowable power dissipation Pd max CMD1667M, 1668M: Mounted on a printed circuit board (20 × 15 × 1.5 mm3, glass epoxy) V Operating temperature Topr –30 to +80 °C Storage temperature Tstg –55 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Input current range Common-mode input voltage range Symbol Conditions ICC 6.0 to 50 VICM mA 0 to VIN –1.5 V Electrical Characteristics at Ta = 25°C, ICC = 10 mA Parameter Output limit voltage Output saturation voltage VIN voltage Amplifier input offset voltage Amplifier input bias current Symbol Conditions Ratings min typ max Unit VOLM1 Z1, Z2 open 54 57 60 VOLM2 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 VIN ICC = 7.0 mA V nA RD output saturation voltage VRDsat IRD = 5 mA* 0.1 0.3 V FG output saturation voltage VFG sat IFG = 5 mA* 0.1 0.3 V C outflow current IC1 2.1 3.0 3.9 µA C discharge current IC2 0.31 0.44 0.59 µA VTH1 0.77 0.8VIN 0.83 V VTH2 0.42 0.45VIN 0.48 Comparator input threshold voltage Thermal shutdown current operating temperature Thermal shutdown circuit hysteresis V TSD Design target value 180 °C ∆TSD Design target value 40 °C Note: * RD output: CMD1668M, FG output: CMD1667M * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 2 of 9 Rev 1.0 Aug. 23,2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers Block Diagram and Application Circuit • CMD1667M • CMD1668M Truth Table (CMD1667M) 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 OUT2 RD 14 13 VIN RD 12 Z2 11 9 10 Z1 OUT2 NC 8 NC CMD1668M, CMD1667M Truth Table (CMD1668M) IN+ Pin Assignments IN– C OUT1 H L L H L L IN- IN+ C L H L L H L 1 2 3 H L H H H H L H H H H H NC OUT1 NC GND 4 5 6 7 * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 3 of 9 Rev 1.0 Aug. 23,.2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers CMD1668M Sample Application Circuits • 12-V power supply type • 24-V power supply type * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 4 of 9 Rev 1.0 Aug. 23,2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers • Circuit for use when large output currents are required and heat dissipation is high. CMD1667M Sample Application Circuits • 12-V power supply type * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 5 of 9 Rev 1.0 Aug. 23,.2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers • 24-V power supply type • Circuit for use when large output currents are required and heat dissipation is high. * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 6 of 9 Rev 1.0 Aug. 23,.2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers 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 (CMD1668M) is an open collector output and outputs a low level during drive and a high level when stopped. The FG pin (CMD1667M) 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. * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 7 of 9 Rev 1.0 Aug. 23,.2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers 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. * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 8 of 9 Rev 1.0 Aug. 23,.2004 Fax:886-3-3521052 CMD1668M,CMD1667M Two-Phase Unipolar Drive Brushless Motor Drivers LB1668, 1667 LB1668M, 1667M * All specs and applications shown above subject to change without prior notice. 1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN Email: [email protected] Tel:886-3-3214525 Http: www.ceramate.com.tw Page 9 of 9 Rev 1.0 Aug. 23,2004 Fax:886-3-3521052