TB6556FG_12 Datasheet, PDF (12/22 Pages) Toshiba Semiconductor – 3-Phase Full-Wave Sine-Wave PWM Brushless Motor Controller

TB6556FG
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
LOW (CW)
HIGH (CCW)
Actual Motor Rotating Direction
CW (forward)
CCW (reverse)
CW (forward)
CCW (reverse)
REV Pin
LOW
HIGH
HIGH
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
LOW
OS Pin
LOW
HIGH
Output Turn-on Signal
(U, V, W, X, Y, Z)
HIGH
LOW
(When RES = LOW, bootstrap capacitor charging stops.)
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2012-10-22