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TB6551F Datasheet(PDF) 10 Page - Toshiba Semiconductor

Part No. TB6551F
Description  3-Phase Full-Wave Sine-Wave PWM Brushless Motor Controller
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Maker  TOSHIBA [Toshiba Semiconductor]
Homepage  http://www.semicon.toshiba.co.jp/eng
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TB6551F Datasheet(HTML) 10 Page - Toshiba Semiconductor

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TB6551F
2002-12-24
10
7.
Outputting reverse rotation detection signal
Detects motor rotation direction every electrical degrees of 360°. (The output is high immediately after
reset)
REV terminal increases with a 180° turn-on mode at the time of low.
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
8.
Protecting input pin
1.
Overcurrent protection (Pin Idc)
When the 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 block protection (Pin RES)
When the input signal level is Low, turns off the output; when High, restarts the output.
Detects abnormality externally and inputs the signal to the 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.)
3.
Internal protection
· Positional signal abnormality protection
When the positional signal is HHH or LLL, turns off the output; otherwise, restarts the output.
· Low power supply voltage protection (VCC monitor)
When power supply is on/off, prevents damage caused by short-circuiting power device by
keeping the turn-on signal output at high impedance outside the operating voltage range.
Output at high impedance
Turn-on signal
Power supply
voltage
4.5 V (typ.)
4.0 V (typ.)
GND
VM
VCC
Output at high impedance
Output


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