tb6526afg TOSHIBA Semiconductor CORPORATION, tb6526afg Datasheet - Page 8

• Manufacturer Part Number: tb6526afg
• Description: Chopper?type Bipolar Stepping Motor Control Driver Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

OSC frequency calculation
V
V
OSC
OSC
V
V
is increased by C
is calculated by following equation.
V
t
t
f
1
OSC (H)
OSC (L)
OSC
2
OSC
=
=
150
Q
2.05 V.
Q3 and Q4 are turned “on” when V
Lower level of V (22) pin is equal to V
Assuming that V
1.0
2.05
150
=
=
2
=
t
150
is turned “off” when V
C
0.143
×
2
×
= V
≈ 2.05 V
= V
≈ 1.0 V
×
OSC
×
C
1
−
10
C
C
10
×
OSC
t
1
10
OSC
OSC
BE (Q2)
BE (Q2)
−
−
6
(kHz)
6
=
−
6
C
OSC
×
OSC
t
150
+ 1.35
+ V
(C
OSC
charging through the constant current source (150 µA).
OSC
(2.05
×
CE (SAT)
10
= 1.0 V (t = t
unit
−
−
6
1.0)
OSC
=
(Q
µ
F
4
is less than the voltage of 1.35 V + V
)
)
1
OSC
) and = 2.05 V (t = t
BE
becomes 2.05 V.
(Q
2
8
) + V
CE (SAT)
2
), OSC frequency is calculated as follows.
(Q
4
) approximately equal to 1.0 V.
BE
(Q
2
) approximately equal to
TB6526AF
2006-3-6