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Stepping Motor Driver IC
The TB6608FNG is a PWM constant-current type stepping
motor driver IC designed for sinusoidal-input micro-step control of
stepping motors.
The TB6608FNG can be used in applications that require
2-phase, 1-2-phase, W1-2-phase and 2W1-2 phase excitation
modes. The TB6608FNG is capable of forward and reverse driving
of a 2-phase bipolar stepping motor using only a clock signal.
Features
•
Motor power supply voltage: V
•
Control power supply voltage: V
•
Output current: Iout ≤ 0.8 A (max)
•
Output ON-resistance: Ron = 1.5 Ω (upper and lower sum@V
•
Decoder that enables microstep control with the clock signal
•
Selectable phase excitation modes (2, 1-2, W1-2 and 2W1-2)
•
Internal pull-down resistors on inputs: 200 kΩ (typ.)
•
Output monitor pin ( MO )
•
Thermal shutdown (TSD) and undervoltage lockout (UVLO) circuits
•
Small surface-mount package (SSOP20: 0.65 mm lead pitch)
•
This product has a MOS structure and is sensitive to electrostatic discharge. When handling this product, ensure
that the environment is protected against electrostatic discharge by using an earth strap, a conductive mat and an
ionizer. Ensure also that the ambient temperature and relative humidity are maintained at reasonable levels.
•
Do not insert devices in the wrong orientation or incorrectly. Otherwise, it may cause the device breakdown,
damage and/or deterioration.
About solderability, following conditions were confirmed
• Solderability
(1) Use of Sn-37Pb solder Bath
· solder bath temperature = 230°C
· dipping time = 5 seconds
· the number of times = once
· use of R-type flux
(2) Use of Sn-3.0Ag-0.5Cu solder Bath
· solder bath temperature = 245°C
· dipping time = 5 seconds
· the number of times = once
· use of R-type flux
TOSHIBA Bi−CD Integrated Circuit Silicon Monolithic
TB6608FNG
= 15 V (max)
M
= 2.7 to 6 V
CC
Weight: 0.09 g (typ.)
= 5 V)
M
1
TB6608FNG
2007-12-17
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Related Manuals for Toshiba TB6608FNG
Summary of Contents for Toshiba TB6608FNG
- Page 1 The TB6608FNG can be used in applications that require 2-phase, 1-2-phase, W1-2-phase and 2W1-2 phase excitation modes. The TB6608FNG is capable of forward and reverse driving of a 2-phase bipolar stepping motor using only a clock signal. Features Weight: 0.09 g (typ.)
- Page 2 TB6608FNG Block Diagram STBY STANBY UVLO Pre- H-bridge driver timer Decoder for microstep CW/CCW control W1-2 RESET 2W1-2 phase ENABLE Pre- H-bridge driver Vref 2 switches timer 0.125 V, 0.5 V Vref Voltage Setting Input Vref 0.125 V 0.5 V...
- Page 3 TB6608FNG Pin Function Pin No. Symbol Functional Description Remarks = 2.7 to 5.5 V Power supply pin for logic block CC (opr) STBY Standby input See the Input Signals and Operating Modes table. Connection pin for an external capacitor used for internal oscillation Excitation mode setting input 1 See the Excitation Mode Settings table.
- Page 4 TB6608FNG Input Signals and Operation Modes Inputs Operating Mode CW/CCW RESET ENABLE STBY Initial mode Enable Wait mode (Outputs: high impedance) Standby mode (Outputs: high impedance) X: Don’t Care Excitation Mode Settings Inputs Excitation Mode 2-phase 1-2-phase W1-2-phase 2W1-2-phase Initial A- and B-Phase Currents (This table also applies to the currents on exit from standby mode.)
- Page 5 TB6608FNG 2-Phase Excitation (M1: L, M2: L, CW Mode) 2-Phase Excitation (M1: L, M2: L, CCW Mode) − 100 − 100 − 100 − 100 1-2-Phase Excitation (M1: H, M2: L, CW Mode) 1-2-Phase Excitation (M1: H, M2: L, CCW Mode) −...
- Page 6 TB6608FNG W1-2-Phase Excitation (M1: L, M2: H, CW Mode) − 38 − 71 − 92 − 100 − 38 − 71 − 92 − 100 2007-12-17...
- Page 7 TB6608FNG W1-2-Phase Excitation (M1: L, M2: H, CCW Mode) − 38 − 71 − 92 − 100 − 38 − 71 − 92 − 100 2007-12-17...
- Page 8 TB6608FNG 2W1-2-Phase Excitation (M1: H, M2: H, CW Mode) − 20 − 38 − 56 − 71 − 83 − 92 − 98 − 100 − 20 − 38 − 56 − 71 − 83 − 92 − 98 − 100...
- Page 9 TB6608FNG 2W1-2-Phase Excitation (M1: H, M2: H, CCW Mode) − 20 − 38 − 56 − 71 − 83 − 92 − 98 − 100 − 20 − 38 − 56 − 71 − 83 − 92 − 98 − 100...
- Page 10 TB6608FNG Output Current Vector Locus (Normalizing a single step to 90 degrees) (Only when in 2-phase excitation mode) Solid line: Ideal value Broken line: Calculated value θ 8 θ 7 θ 6 θ 5 θ 4 θ 3 θ 2 θ 1...
- Page 11 TB6608FNG Relationship between the ENABLE Input and the Phase Current and MO Outputs Example 1: 1-2-phase excitation (M1: H, M2: L) Setting the ENABLE signal Low disables only the output signals. On the other hand, internal logic functions continue to operate in accordance with the CK signal.
- Page 12 TB6608FNG Relationship between the RESET Input and the Phase Current and MO Outputs Example 1: 1-2-phase excitation (M1: H, M2: L) Setting the RESET signal Low causes the outputs to be put in the Initial state and the MO output to be Low.
- Page 13 TB6608FNG Absolute Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit Power supply voltage Iout(AO), Iout(BO) Output current Withstand voltage of MO − 0.2 to V + 0.2 Input voltage 0.71 (Note 1) Power dissipation 0.96 (Note 2) − 20 to 85 Operating temperature °C...
- Page 14 TB6608FNG Chopper Control Turning on the power (chop on) causes a current to flow into the coils. Once the V voltage reaches Vref, it is detected by the comparator and the power is turned off (chop off). The off timer/counter counts the number of falling edges of the internal CK signal, which is derived from the OSC signal, and generates the motor-driving PWM signal based on the turn-off time of four CK cycles.
- Page 15 TB6608FNG PWM Control In PWM mode, the motor operating mode changes between CW/CCW and short brake alternately. To eliminate shoot-through current that flows from supply to ground due to the simultaneous conduction of high-side and low-side transistors in the bridge output, a dead time of 200 ns (design target value) is generated in the IC when transistors switch from on to off (t2), or vice versa (t4).
- Page 16 TB6608FNG 1. Constant-Current Chopping When V reaches the predefined Vref voltage, the constant-current regulator enters Discharge mode. After four cycles of CK, an internal clock generated by OSC, the regulator moves from Discharge mode to Charge mode. Vref Internal CK...
- Page 17 TB6608FNG 2. Changing the Predefined Current to the Lower Value During deceleration, the regulator enters fast-decay mode immediately after the end of the current decay slope of slow-decay mode. The distortion of the current waveform can be reduced by the regenerative current from a coil that flows back to the power supply.
- Page 18 TB6608FNG In fast-decay mode, the regenerative current from a coil flows back to the power supply as shown below. OUT1 OUT2 OUT1 OUT2 (Slow decay mode) (Fast decay mode) 3. Changing the Predefined Current to the Higher Value Even when the Vref voltage is increased, the regulator remains in Discharge mode for four CK cycles and then enters Charge mode.
- Page 19 Also, it should be ensured that the DCY input is set High only when the coil of a motor has an inductance of 1.5 mH or higher where fosc is no less than 100 kHz. Thermal Shutdown (TSD) Circuit The TB6608FNG includes a thermal shutdown circuit, which turns the output transistors off when the junction temperature (T ) exceeds 160°C (typ.).
- Page 20 Even when UVLO circuit is tripped, internal circuitry continues to operate in accordance with the CK input like when ENABLE is set Low. Thus, after the TB6608FNG exits the UVLO mode, the RESET signal should be asserted for putting the TB6608FNG in the Initial state if necessary.
- Page 21 TB6608FNG Output Block Test Characteristics Symbol Test Condition Typ. Unit Circuit = 0.2 A ⎯ Output saturation voltage SAT (U + L) = 0.6 A ⎯ ⎯ = 0.6 A Diode forward voltage ⎯ 2W1-2-phase W1-2-phase 1-2-phase θ = 0 ⎯...
- Page 22 TB6608FNG Test Circuit 1: V IN (H) IN (L) = 3.3 V = 5 V CW/CCW RESET ENABLE Oscilloscope STBY 2 Ω 2 Ω IN (L) IN (H) Test Circuit 2: I = 3.3 V = 5 V CW/CCW RESET...
- Page 23 TB6608FNG Test Circuit 3: V = 3.3 V = 5 V CW/CCW RESET ENABLE STBY Test Circuit 4: V SAT (UL) = 3.3 V = 5 V CW/CCW RESET ENABLE STBY 2007-12-17...
- Page 24 TB6608FNG Test Circuit 5: V CW/CCW RESET ENABLE STBY Test Circuit 6: I = 3.3 V CW/CCW RESET ENABLE STBY 2007-12-17...
- Page 25 TB6608FNG AC Electrical Characteristics, Test Circuit 7: CK (OSC) and Output Voltage CLOCK CLOCK CLOCK (OSC) Output voltage 2007-12-17...
- Page 26 TB6608FNG Application Circuit Example = 3.3 V = 5 V Clock Stepping CW/CCW Motor CW/CCW Reset RESET Enable ENABLE Standby STBY 2 Ω 2 Ω Note 1: Capacitors for the power supply lines should be connected as close to the IC as possible.
- Page 27 TB6608FNG Package Dimensions Weight: 0.09 g (typ.) 2007-12-17...
- Page 28 The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass production design stage. Toshiba does not grant any license to any industrial property rights by providing these examples of application circuits.
- Page 29 TB6608FNG Points to Remember on Handling of ICs Thermal Shutdown Circuit Thermal shutdown circuits do not necessarily protect ICs under all circumstances. If the thermal shutdown circuits operate against the over temperature, clear the heat generation status immediately. Depending on the method of use and usage conditions, such as exceeding absolute maximum ratings can cause the thermal shutdown circuit to not operate properly or IC breakdown before operation.
- Page 30 TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties.
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