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TB62209F Datasheet(PDF) 4 Page - Toshiba Semiconductor |
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TB62209F Datasheet(HTML) 4 Page - Toshiba Semiconductor |
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4 / 51 page  TB62209F 2001-09-05 4 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. Note 1: RS COMP1: Compares the set current with the output current and outputs a signal when the output current reaches the set current. Note 2: RS COMP2: Compares the set current with the output current at the end of Fast mode during chopping. Outputs a signal when the set current is below the output current. Waveform shaping circuit VM RS Vref 100 ％ 85 ％ 70 ％ 50 ％ Chopping waveform generator circuit CR VRS circuit 1 (detects potential difference between RS and VM) RS COMP circuit 1 (Note 1) NF (set current reached signal) VRS circuit 2 (detects potential difference between VM and RS) RS COMP circuit 2 (Note 2) RNF (set current monitor signal) <Use in FAST MODE> <Use in Charge mode> Output control circuit Mixed Decay timing circuit Output stop signal (ALL OFF) Chopping reference circuit 0 Current feedback circuit Torque control circuit Current setting circuit DA circuit TORQUE 0, 1 CURRENT 0-3 Decoder Unit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Micro-step current setting selector circuit 4-bit DA circuit |
Similar Part No. - TB62209F |
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Similar Description - TB62209F |
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