tb6512afg TOSHIBA Semiconductor CORPORATION, tb6512afg Datasheet - Page 8

• Manufacturer Part Number: tb6512afg
• Description: Pwm Chopper Type Bipolar Stepping Motor Driver
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Sawtooth OSC circuit consists of Q
Q
V
Q
Lower level of V
V
Assuming that V
C
Therefore, OSC frequency is calculated as follows.
OSC frequency calculation
OSC
OSC
OSC
2
3
is turned “off” when V
and Q
is increased by C
is calculated by following equation.
is external capacitance connected to pin
t
t
f
1
OSC
2
4
＝
＝
are turned “on” when V
146
1.0
2.05
146
＝
＝
(22)
C
t
0.139
×
×
OSC
2
×
OSC
×
C
10
1
−
C
10
OSC
pin is equal to V
OSC
‐
‐
= 1.4 V (t = t
t
1
(kHz)
6
6
OSC
＝
OSC
C
charging through R
OSC
(C
is less than the voltage of 2.5 V + V
146
OSC
(2.05
1
OSC
1
×
) and = 2.05 (t = t
unit
BE
through Q
10
‐
becomes 2.05 V (Higher level.)
−
Q
6
＝
2 +
1.0)
µ
F
V
(22)
SAT
)
4
1
and R
.
and R
Q
4
2
)
approximately equal to 1.4 V.
8
1
1
through R
is on−chip 10 kΩ resistor.
BE
4
.
Q
2
approximately equal to 2.05 V.
TB6512AF/AFG
2006-3-6