TB62209F Preliminary TOSHIBA BiCD Processor IC Silicon Monolithic TB62209F Stepping Motor Driver IC Using PWM Chopper Type The TB62209F is a stepping motor driver driven by chopper micro-step pseudo sine wave. The TB62209F 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. Thus, the TB62209F can easily drive stepping motors with low-torque ripples and at high efficiency. Also, TB62209F consists output steps by DMOS (Power MOS Weight: g (typ.) FET), and that makes possible to control the output power dissipation much lower than ordinary IC with bipolar transistor output. 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. Features * * * * * * * * * * * * Bipolar stepping motor can be controlled by a single driver IC Monolithic BiCD IC Low ON-resistance of Ron = 0.5 (Tj = 25C @1.0 A: typ.) Built-in decoder and 4-bit DA converters for micro steps Built-in ISD, TSD, VDD &VM power monitor (reset) circuit for protection Built-in charge pump circuit (two external capacitors) 36-pin power flat package (HSOP36-P-450-0.65) Output voltage: 40 V max Output current: 1.8 A/phase max 2-phase, 1-2 (type 2) phase, W1-2 phase, 2W1-2 phase, 4W1-2 phase, or motor lock mode can be selected. Built-in Mixed Decay mode enables specification of four-stage attenuation ratio. Chopping frequency can be set by external resistors and capacitors. High-speed chopping possible at 100 kHz or higher. Note: When using the IC, pay attention to thermal conditions. These devices are easy damage by high static voltage. In regards to this, please handle with care. 1 2001-09-05 TB62209F Block Diagram 1. Overview TORQUE 1 TORQUE 2 MDT 1 MDT 2 RESET CW/CCW ENABLE STANDBY D MODE 3 D MODE 2 D MODE 1 CLK OCS Micro-step decorder VDD MO Chopper OSC CR Current Level Set Vref Torque control 4-bit DA (sine angle control) CR-CLK converter Current Feedback (x2) RS VRS 1 RS COMP 1 Output control (Mixed Decay control) VM VM VRS 2 RS COMP 2 Ccp C Charge Pump Unit STANDBY Output (H-bridge) x2 ENABLE VM ISD TSD Ccp B Ccp A VDDR/VMR protect Protection Unit VDD TSD protect Stepping Moter 2 2001-09-05 TB62209F 2. LOGIC UNIT A/B (C/D unit is the same as A/B unit) Function This circuit is used to input from the DATA pins 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. MDT 1 MDT 2 TORQUE 1 TORQUE 2 DATA MODE D MODE 1 D MODE 2 D MODE 3 CW/CCW CLK STANDBY RESET Micro-step decoder Decay x 2 bits A unit side Micro-step current data x 4 bits A unit side Phase x 1 bit A unit side ENABLE Output control circuit Torque x 2 bits Decay x 2 bits B unit side Micro-step current data x 4 bits B unit side Phase x 1 bit B unit side Current feedback circuit Mixed Decay circuit DA circuit Output control circuit 3 2001-09-05 TB62209F 3. Current feedback circuit and current setting circuit Function 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 clock used as reference for the chopping frequency. TORQUE 0, 1 Decoder Unit CURRENT 0-3 Vref 100 85 70 50 Torque control circuit 15 Micro-step current 14 setting 13 12 selector 11 circuit 10 9 8 7 6 5 4 4-bit 3 DA 2 circuit 1 0 Chopping waveform generator circuit CR Waveform shaping circuit Chopping reference circuit Mixed Decay timing circuit Current setting circuit DA circuit Output stop signal (ALL OFF) RS VRS circuit 1 (detects potential difference between RS and VM)
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