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TPIC43T01DA Datasheet(PDF) 10 Page - Texas Instruments |
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TPIC43T01DA Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page TPIC43T01, TPIC43T02 THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS SLIS098 – APRIL 2000 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION voltage regulator The TPIC43T01/02 receives an 8 to 28 V supply voltage at the VCC pin and generates an internal 5 V, VDD, supply for the internal analog and digital logic. An external terminal for VDD is provided for a required external 1 µF compensation capacitor. The regulator can also supply up to 10 mA current from the VDD pin to external circuitry. oscillators internal oscillator The device generates an internal 5.8 MHz clock to supply a frequency input to internal control blocks as presented in Figure 4. No external components are required. 5.8 MHz Oscillator ÷ 32 Charge Pump ILIM/OCSD Deglitch Timer 8-Bit PWM Generator PWM, f ∼23 kHz Watchdog ÷ 8 Gate Drive Dead Time Control Integrator 181 kHz ∼ 45 kHz Figure 4. 5.8 MHz Internal Oscillator Fanout FG reference oscillator The FG reference oscillator provides a clock to the FG frequency control section of the device. The oscillator requires an external 5 to 10 MHz crystal to select the primary frequency. The user can alternatively input a 1 to 10 MHz signal from a signal generator to the OSC1 input to replace the external crystal. Two EEPROM bits allow programming four different crystal oscillator divide-by values for controlling the FG reference frequency. The FSEL pin provides an additional divide-by-2 for on-the-fly FG frequency (RPM) selection. Table 1 shows the divide-by count and resulting FG reference frequency based on the two EEPROM bits (address 1, bits 0 –1) and the FSEL pin input level. |
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