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參數資料
| 型號： | TB62218FNG |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO48 |
| 封裝： | 0.300 INCH, 0.50 MM PITCH, PLASTIC, TSSOP-48 |
| 文件頁數： | 3/24頁 |
| 文件大小： | 463K |
| 代理商： | TB62218FNG |
TB62218FNG
2010-10-07
11
Current Waveform in Mixed (Slow
+ Fast) Decay Mode
Timing charts may be simplified for explanatory purposes.
When a current value increases (Mixed-Decay point is fixed to 37.5%)
When a current value decreases (Mixed-Decay point is fixed to 37.5%)
The Charge period starts as the internal oscillator clock starts counting. When the output current reaches the
predefined current level, the internal RS comparator detects the predefined current level (NF); as a result, the IC
enters Slow-Decay mode.
The TB62218FNG transits from Slow-Decay mode to Fast-Decay mode at the point 37.5% of a PWM frequency
(one chopping frequency) remains in a whole PWM frequency period (on the rising edge of the 11th clock of the
OSCM clock).
When the OSCM pin clock counter clocks 16 times, the Fast-Decay mode ends; and at the same time, the
counter is reset, which brings the TB62218FNG into Charge mode again.
Note: These figures are intended for illustrative purposes only. If designed more realistically, they would show transient
response curves.
Internal
OSCM CLK
fchop
NF
Charge
Slow
Charge
Fast
Charge
Slow
Fast
Slow
Charge
Fast
Predefined
current level
Predefined
current level
NF
Internal
OSCM CLK
Predefined
current level
Charge
fchop
NF
Charge
Slow
Charge
Fast
NF
Slow
Fast
Slow
Charge
Fast
The IC enters Charge mode for a moment at which the internal RS
comparator compares the values. The IC immediately enters Slow-Decay
mode because of the current value exceeding the predefined current level.
Charge
Predefined
current level
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