Stepping Motor Driver IC Using PWM Chopper Type: TB62209FG
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An overview on Stepping Motor Driver IC Using PWM Chopper Type
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Stepping Motor Driver IC Using PWM Chopper Type: TB62209FG
- 5. Current Waveform and Setting of Mixed Decay Mode Current Waveform
- 6. Output Equivalent Circuit Output Equivalent Circuit
- 7. Current Feedback Circuit And Current Setting Circuit Current feedback circuit and current setting circuit
- 8. Functions of Excitation Modes
- 10. Output Transistor Operating Mode
- 11. Recommended Power Supply Sequence Power Supply Sequence
- 13. Operation of Charge Pump Circuit
- 14. 2W1-2 Phase Excitation Mode: Output 2W1-2 Phase Excitation mode
- 16. Recommended Application Circuit Application Circuit
- 17. Micro-stepper Driver TB62209/2 - 1Ω, 1A: Micro stepper driver
- 18. Application Circuits TB62209/1 - 1Ω, 1A microstepper driver – System diagram for fully featured control
Editor's Notes
- Welcome to the training module on the TB62209FG. This module introduces the features of Stepping Motor Driver IC Using PWM Chopper Type and its operation.
- The TB62209FG is a stepping motor driver driven by chopper micro-step pseudo sine wave. It integrates a decoder for CLK input in micro steps as a system to facilitate driving a two-phase stepping motor using micro-step pseudo sine waves. Micro-step pseudo sine waves are optimal for driving stepping motors with low-torque ripples and at low oscillation. It can easily drive stepping motors with low-torque ripples and at high efficiency.
- This circuit is used to input from the DATA pin,s micro-step current setting data and to transfer them to the subsequent stage. By switching the SETUP pin, the data in the mixed decay timing table can be overwritten. When the VM value is between 3.3 to 5.5 V, the internal reset is released, thus output may be on. In such a case, the charge pump cannot drive stably because of insufficient voltage. The Standby state should be maintained until VM reaches 13 V or more.
- At constant current control, in current amplitude (pulsating current) Decay mode, a point from 0 to 3 can be set using 2-bit parallel data. NF is the point where the output current reaches the set current value. RNF is the timing for monitoring the set current. The smaller the MDT value, the smaller the current ripple (peak current value).
- The diode on the dotted line is parasitic diode C/D unit is the same as A/B unit. TORQUE X changes the current peak value in four steps. Used to change the value of the current used, the IC supports Mixed Decay mode for switching the attenuation ratio at chopping. The switching time for the attenuation ratio can be switched in four stages according to the load.
- The current setting circuit is used to set the reference voltage of the output current using the current setting decoder. The current feedback circuit is used to output to the output-control-circuit the relation between the set current value and output current. This is done by comparing the reference voltage output to the current setting circuit with the potential difference generated when current flows through the current sense resistor connected between RS and VM. The chopping waveform generator circuit to which CR is connected is used to generate a clock which is used as reference for the chopping frequency
- This slide shows the Excitation modes. There are 8 excitation modes defined low Power dissipation mode, Motor Lock Mode, 2-Phase Excitation mode, 1 to 2 Phase Excitation low Torque, 1 to 2 Phase Excitation High Torque, W1-2 Phase Excitation or 2-bit micro-step change, 2W1-2 Phase Excitation or 3-bit micro-step change and 4W1-2 Phase Excitation or 4-bit micro-step change.
- This slide shows the Current Discharge Path when ENABLE Input During Operation. The output transistor has parasitic diodes. To discharge energy from the coil, each transistor is switched on allowing current to flow in the reverse direction to that in normal operation. As a result, the parasitic diodes are not used. If all the output transistors are forced to switch off, the energy of the coil is discharged via the parasitic diodes.
- When current flows in the direction of the arrows as shown in charge mode, U1 and L2 are on and U2 and L1 are Off. In slow mode, L1 and L2 are on and rest are all in off condition. In fast mode, U2 and L1 are on and the rest are in off condition. When the current flows in the opposite direction of the arrows then in slow mode, it is same as earlier and in charge mode U1 and L2 are Off and U2 and L1 are ON. In fast mode U2 and L1 are OFF and the rest are in off condition.
- If the VDD drops to the level of the VDDR or below while the specified voltage is inputed to the VM pin, the IC is internally reset. This is a protective measure against malfunction. Likewise, if the VM drops to the level of the VMR or below, while regulation voltage is inputed to the VDD, the IC is internally reset as a protective measure against malfunction. To avoid malfunction, when turning on VM or VDD, inputting the Standby signal at the timing shown is recommended. It takes time for the output control charge pump circuit to stabilize. Wait up to t ONG time or charge pum rise time after power-on before driving the motors.
- Some key design parameters to consider are how to calculate set current and calculate the chopping and oscillating frequencies are shown.
- When RESET is released, Tr1 is turned ON and Tr2 is turned OFF. Ccp 1 is charged from Ccp 2 via Di1. When Tr1 is turned OFF and Tr2 is turned ON, and Ccp 1 is charged from Ccp 2 via Di2. When the voltage difference between VM and VH (Ccp A pin voltage = charge pump voltage) reaches VDD or higher, operation halts (Steady state). Ccp 1 charge is used at chop frequency or f-chop switching and the VH potential drops. Choose Ccp 1 and Ccp 2 to be combined. It is recommended that the ration between Ccp 1 and Ccp 2 is 10:1 or more.
- 2-phase excitation has a large load change due to motor induced electromotive force. If a mode in which the current attenuation capability (current control capability) is small is used, current increase due to induced electromotive force may not be suppressed. In such a case, use a mode in which the mixed decay ratio is large.
- Keep phase B on and Phase A Off, if you want to hold (lock) the rotor at any desired value.
- The values for the devices are all recommended values. Make sure that GND wiring has only one contact point, and to design the pattern that allows the heat radiation. To control setting pins in each mode by SW, make sure to pull them up or down to avoid high impedance.
- This slide shows the application circuit used as Micro-Stepper driver. It is an alternative system configuration with locally hard wired features and simple remote control via clock.
- This is the application circuit for Micro stepper motor controller, this System diagram is for fully featured control which is driven from MCU.
- Thank you for taking the time to view this presentation on “ TB62209FG” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more technical information you may either visit the Toshiba site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit Element 14 e-community to post your questions.