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參數(shù)資料
| 型號(hào)： | TB6581HG |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PZIP25 |
| 封裝： | PLASTIC, HZIP-25 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 410K |
| 代理商： | TB6581HG |
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TB6581HG
2008-09-12
6
Functional Description
1.
Basic operation
The motor is driven by the square-wave turn-on signal based on a positional signal. When the positional
signal reaches number of rotations f
= 5 Hz or higher, the rotor position is estimated according to the
positional signal and a modulation wave is generated. The modulation wave and the triangular wave are
compared; then the sine-wave PWM signal is generated and the motor is driven.
From start to 5 Hz: When driven by square wave (120° turn-on) f
= fosc/(212 × 32 × 6)
5 Hz or higher: When driven by sine-wave PWM (180° turn-on);
when fosc = 4 MHz, approx. 5 Hz
2.
Ve voltage command input and bootstrap power supply
(1)
Voltage command input: When Ve <= 1.0 V
U, V and W signals are stopped to protect IGBTs
(2)
Voltage command input: When 1.0 V
< Ve <= 2.1 V
The low-side IGBTs are turned on at a fixed frequency (carrier frequency) (duty cycle: 8%).
(3)
Voltage command input: When Ve > 2.1 V
The U, V and W signals are driven out during sine wave drive.
The low-side IGBTs are forced to on at fixed frequency (carrier frequency) during square-wave drive
(duty cycle: 8%).
Note 1:
At startup, the low-side IGBTs must be turned on for a fixed period at 1.0 V
< Ve <= 2.1 V to charge the
high-side IGBT power supply.
3.
Dead time function: upper/lower transistor output off-time
When the motor is driven by sine-wave PWM, dead time is digitally generated inside the IC to prevent
short circuit caused by the simultaneously turning on of upper and lower external power devices. When a
square wave is generated in full-duty cycle mode, the dead time function is turned on to prevent a short
circuit.
Internal Counter
TOFF
8/fosc
1.9
s
TOFF values above are obtained when fosc = 4.19 MHz.
fosc = reference clock (ceramic oscillation)
4.
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°)
(1)
(2)
(3)
100%
2.1 V
1.0 V
5.4 V
Ve
Modulation percentage
(1) 0 to 1.0 V: Reset state (All outputs are off.)
(2) Ve = 1.0 to 2.1 V: Startup operation
(duty cycle of 8% for the low-side IGBTs)
(3) Ve = 2.1 to 5.4 V: Motor operation
(5.4 V to Vcc: Fixed to the maximum modulation percentage)
(*) Modulation percentage of 100% does not correspond to output ON duty.
Modulation wave indicates the maximum state determined by IC.
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