参数资料
型号: TB62201AFG
元件分类: 运动控制电子
英文描述: STEPPER MOTOR CONTROLLER, 1.5 A, PDSO38
封装: 0.450 INCH, 0.65 MM PITCH, PLASTIC, HSOP-36/38
文件页数: 16/89页
文件大小: 1396K
代理商: TB62201AFG
TB62201AFG
2005-04-04
23
Calculation of Set Current
Determining RRS and Vref determines the set current value.
Iout (max)
=
(GAIN)
V
1
ref
× Vref (V) ×
)
(
)
=
RS
orque
R
data
serial
input
:
50%
70,
85,
100,
(T
T
1/5.0 is Vref (gain): Vref attenuation ratio (typ.).
For example,
to input Vref = 3 V and Torque = 100% and to output Iout = 0.8 A,
RRS = 0.75 (0.5 W or more) is required.
Formulas for Calculating CR Oscillation Frequency (Chopping reference frequency)
The CR oscillation frequency and fchop can be calculated by the following formulas:
fCR =
C)
KB
R
(C
KA
1
×
[Hz]
KA (constant): 0.523
KB (constant): 600
fchop =
8
fCR [Hz]
Example: When Cosc = 1,000 pF and Rosc = 2.0 k are connected, fCR = 735 kHz.
At this time, the chopping frequency fchop is: fchop = fCR/8 = 92 kHz.
Note:
fCR =
CR
t
1
Charge)
-
(Dis
t
(Charge)
t
tCR
+
=
CR oscillation CR charge
CR distance
cycle
time
At this time, t (CR
discharge) is subject to the following condition :
600 ns
> t (CR discharge) > 400 ns.
Be sure to set the CR value in accordance with this condition.
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