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CMD1668M,CMD1667M
Two-Phase Unipolar Drive Brushless Motor Drivers
Overview
Package Dimensions
[CMD1668M, 1667M]
14
8
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.
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 (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
1
8.0
0.35
1.0 1.0
0.1
1.5
1.8max
7
0.15
5.15 6.4
4.4
0.625
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: server@ceramate.com.tw 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 = 25C
Parameter Maximum input current Output voltage Output current Output minus current RD/FG influx current RD/FG voltage Symbol ICC max VOUT IOUT IOM IRD/IFG VRD/VFG Pd max CMD1667M, 1668M: Mounted on a printed circuit board (20 x 15 x 1.5 mm3, glass epoxy) t 20 ms Conditions Ratings 200 Internal 1.5 -50 10 30 0.8 Unit mA V A mA mA V W
Allowable power dissipation Operating temperature Storage temperature
Topr Tstg
-30 to +80 -55 to +150
C C
Allowable Operating Ranges at Ta = 25C
Parameter Input current range Common-mode input voltage range Symbol ICC VICM Conditions Ratings 6.0 to 50 0 to VIN -1.5 Unit mA V
Electrical Characteristics at Ta = 25C, ICC = 10 mA
Parameter Symbol VOLM1 VOLM2 Vosat1 Output saturation voltage Vosat2 Vosat3 VIN voltage Amplifier input offset voltage Amplifier input bias current RD output saturation voltage FG output saturation voltage C outflow current C discharge current Comparator input threshold voltage Thermal shutdown current operating temperature Thermal shutdown circuit hysteresis Note: * RD output: CMD1668M, FG output: CMD1667M VIN VOFF IBA VRDsat VFG sat IC1 IC2 VTH1 VTH2 TSD TSD Design target value Design target value IRD = 5 mA* IFG = 5 mA* 2.1 0.31 0.77 0.42 Conditions Z1, Z2 open Z1, Z2 short IO = 0.5 A IO = 1.0 A IO = 1.5 A ICC = 7.0 mA 6.4 -7.0 -250 0.1 0.1 3.0 0.44 0.8VIN 0.45VIN 180 40 0.3 0.3 3.9 0.59 0.83 0.48 Ratings min 54 31 typ 57 33 0.95 1.15 1.4 6.7 0 max 60 35 1.2 1.5 2.0 7.0 +7.0 Unit V V V V V V mV nA V V A A V V C C
Output limit voltage
* 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: server@ceramate.com.tw 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+ H L H L IN- L H L H C L L H H OUT1 H L H H OUT2 L H H H FG H L H H
Pin Assignments
14 13 VIN RD
12 Z2
11 9 10 Z1 OUT2 NC
8 NC
Truth Table (CMD1668M)
IN+ H L H L IN- L H L H C L L H H OUT1 H L H H OUT2 L H H H RD L L H H
CMD1668M, CMD1667M
IN1 IN+ 2 C 3 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: server@ceramate.com.tw 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: server@ceramate.com.tw 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: server@ceramate.com.tw 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: server@ceramate.com.tw 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 , and when VCC = 24 R1 = about 1.2 k) 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 s 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 F 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 F 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: server@ceramate.com.tw 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 A (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 x VIN. 3. When the output is turned off, the capacitor is discharged at about 0.44 A (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: server@ceramate.com.tw 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: server@ceramate.com.tw Tel:886-3-3214525 Http: www.ceramate.com.tw Page 9 of 9 Rev 1.0 Aug. 23,2004 Fax:886-3-3521052

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