參數(shù)資料
型號: TB6598FN
元件分類: 運(yùn)動控制電子
英文描述: STEPPER MOTOR CONTROLLER, 0.8 A, PDSO16
封裝: 0.225 INCH, 0.65 MM PITCH, PLASTIC, SSOP-16
文件頁數(shù): 13/18頁
文件大?。?/td> 322K
代理商: TB6598FN
TB6598FN/FNG
2006-3-6
4
Chopper control
The winding current flows while the output drive transistor is On. When the VRF reaches the limit voltage
level (Vlimit), the comparator detects it and turns off the output drive transistor.
The oscillator output is squared to generate an internal clock. The off timer starts on the edge of the
internal clock and is active for two internal clocks. When the off timer stops, the PWM goes high.
The PWM control limits the winding current to a level determined by the current value (IO) as expressed in
the equation below:
IO = Vlimt/RNF.
PWM control function
When PWM control is provided, normal operation and short brake operation are repeated.
To prevent penetrating current, dead time t2 and t4 are provided in the IC.
M
<PWM ON
→ OFF>
t2
= 400 ns (typ.)
M
<PWM OFF>
t3
M
<PWM OFF
→ ON>
t4
= 400 ns (typ.)
<PWM ON>
t5
M
VM
M
<PWM ON>
t1
RF
Off timer
2-bit counter
Winding current
PWM output
*1
*1: Increase of current
*2: Chopping of current
osc
V limit
chop on
Internal clock
*2
*1
*2
*1
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