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参数资料
| 型号： | 5962-9168902VYA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, CDIP28 |
| 封装： | HERMETIC SEALED, CERAMIC, DIP-28 |
| 文件页数： | 3/21页 |
| 文件大小： | 298K |
| 代理商： | 5962-9168902VYA |
EDGE
FINDER
SHIFT
REG
S
Q
R
S
Q
R
PUA
PDA
PULL
DOWN
PULL UP
FROM
DECODER
PWM
CLK
SLUSAG8A
– SEPTEMBER 2011 – REVISED SEPTEMBER 2011
APPLICATION INFORMATION
Cross Conduction Prevention
The UC1625 inserts delays to prevent cross conduction due to overlapping drive signals. However, some thought
must always be given to cross conduction in output stage design because no amount of dead time can prevent
fast slewing signals from coupling drive to a power device through a parasitic capacitance.
The UC1625 contains input latches that serve as noise blanking filters. These latches remain transparent through
any phase of a motor rotation and latch immediately after an input transition is detected. They remain latched for
two cycles of the PWM oscillator. At a PWM oscillator speed of 20 kHz, this corresponds to 50
μs to 100 μs of
blank time which limits maximum rotational speed to 100 kRPM for a motor with six transitions per rotation or 50
kRPM for a motor with 12 transitions per rotation.
This prevents noise generated in the first 50
μs of a transition from propagating to the output transistors and
causing cross-conduction or chatter.
The UC1625 also contains six flip flops corresponding to the six output drive signals. One of these flip flops is set
every time that an output drive signal is turned on, and cleared two PWM oscillator cycles after that drive signal
is turned off. The output of each flip flop is used to inhibit drive to the opposing output (Figure 8). In this way, it is
impossible to turn on driver PUA and PDA at the same time. It is also impossible for one of these drivers to turn
on without the other driver having been off for at least two PWM oscillator clocks.
Figure 8. Cross Conduction Prevention
Copyright
2011, Texas Instruments Incorporated
11
Product Folder Link(s) :UC1625-SP
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