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参数资料
| 型号： | TB6512AFG |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.12 A, PDSO24 |
| 封装： | 0.300 INCH, 1 MM PITCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件页数： | 20/21页 |
| 文件大小： | 541K |
| 代理商： | TB6512AFG |
TB6512AF/AFG
2006-3-6
8
OSC frequency calculation
Sawtooth OSC circuit consists of Q1 through Q4 and R1 through R4.
Q2 is turned “off” when VOSC is less than the voltage of 2.5 V + VBE Q2 approximately equal to 2.05 V.
VOSC is increased by COSC charging through R1.
Q3 and Q4 are turned “on” when VOSC becomes 2.05 V (Higher level.)
Lower level of V(22) pin is equal to VBE Q2 + VSAT Q4 approximately equal to 1.4 V.
VOSC is calculated by following equation.
Assuming that VOSC = 1.4 V (t = t1) and = 2.05 (t = t2)
COSC is external capacitance connected to pin(22) and R1 is onchip 10 k resistor.
Therefore, OSC frequency is calculated as follows.
)
F
unit
(C
(kHz)
C
0.139
1.0)
(2.05
C
10
146
t
1
f
10
146
C
2.05
t
10
146
C
1.0
t
OSC
1
2
OSC
2
OSC
1
6
×
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