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TB6556FG Datasheet(PDF) 12 Page - Toshiba Semiconductor |
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TB6556FG Datasheet(HTML) 12 Page - Toshiba Semiconductor |
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12 / 22 page 
TB6556FG 2012-10-22 12 5. Correcting the lead angle The lead angle can be corrected in the turn-on signal range from 0 to 58° in relation to the induced voltage. Analog input from LA pin (0 V to 5 V divided by 32): 0 V = 0° 5 V = 58° (when more than 5 V is input, 58°) 6. Setting the carrier frequency This function sets the triangular wave cycle (carrier cycle) necessary for generating the PWM signal. (The triangular wave is used for forcibly turning on the lower transistor when the motor is driven by square wave.) Carrier cycle = fOSC/252 (Hz) fOSC = reference clock (ceramic oscillation) 7. Switching the output of the turn-on signal This function switches the output of the turn-on signal between HIGH and LOW. Pin OS: HIGH = active HIGH LOW = active LOW 8. Outputting the reverse rotation detection signal This function detects the motor rotation direction every electrical angle of 360°. (The output is HIGH immediately after reset.) When the signal of REV terminal is low, the operation transfers to 180° commutation mode. (Hall IN = 5 Hz or more) CW/CCW Pin Actual Motor Rotating Direction REV Pin CW (forward) LOW LOW (CW) CCW (reverse) HIGH CW (forward) HIGH HIGH (CCW) CCW (reverse) LOW 9. Protecting input pin 1. Overcurrent protection (Pin Idc) When the DC-link-voltage which is converted from DC-link-current exceeds the internal reference voltage, performs gate block protection. Overcurrent protection is released for each carrier frequency. Reference voltage = 0.5 V (typ.) 2. Gate protection (Pin RES) Output is turned off when the input signal is LOW, restarted when the input signal is HIGH. The abnormality is detected externally and the signal input to pin RES. RES Pin OS Pin Output Turn-on Signal (U, V, W, X, Y, Z) LOW HIGH LOW HIGH LOW (When RES = LOW, bootstrap capacitor charging stops.) |
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