TB6575FNG Toshiba, TB6575FNG Datasheet - Page 6

• Manufacturer Part Number: TB6575FNG
• Manufacturer: Toshiba

Specifications of TB6575FNG

• Function: Controller
• Vopmax (vm*): 5.0V (5.5V)
• Io (lpeak): 20mA
• Sinusoidal Current Wave: no
• Sensor-less: yes
• Speed Feedback Loop: no
• Package: SSOP24
• Rohs Compatible†: yes

PWM signal driving
high-side transistors
PWM signal driving
low-side transistors
Motor pin voltage
3. SC Signal Delay in Rotational Speed Control (V
4. Forced commutation frequency
5. PWM frequency
OS = High or Open
change the speed according to the voltage at V
the voltage applied to the SC input. The voltage at the SC input equals the charging voltage of the
capacitor C1, which depends on its charging and discharging times. This causes a delay in the rise and fall
times of the SC voltage level. The following figure shows the SC delay that occurs when V
between 1 V and 4 V.
experimentally.
within the switching performance of the transistors.
•
•
The V
The forced commutation frequency for startup operation is set as follows.
The optimal frequency varies depending on the motor type and motor loading. Thus, it must be adjusted
The PWM frequency is determined by an external oscillator.
The PWM frequency must be sufficiently high, compared with the electrical frequency of the motor and
V
SC (2 pin)
SP
Charging time of SC (for acceleration):
Discharging time of SC (for deceleration):
* When the motor is stopped (V
instantaneously. (C1 is discharged to GND through a 2-kΩ resistor.)
F
F
F
* f
PWM frequency (f
* f
ST
ST
ST
(5 pin)
XT
XT
SP
= High or Open: Forced commutation frequency f
= Middle:
= Low:
: Ceramic oscillator frequency
: Ceramic oscillator frequency
input is used to control the motor speed; the TB6575FNG allows the motor to start, stop and
PWM
Forced commutation frequency f
Forced commutation frequency f
T
) = f
UP
XT
/256
SP
< 1 V), the capacitor C1 connected to the SC input discharges
SP
. However, the actual operation of the IC is determined by
6
T
T
UP
DOWN
(typ.) = C
SP
ST
ST
ST
(typ.) = C
= f
= f
= f
Follow-Up Property)
XT
XT
XT
1
/(6 × 2
/(6 × 2
/(6 × 2
T
× (V
DOWN
1
× (V
SP
16
17
18
)
)
)
U – V
SP
U – V
V
V
V
V
SP
SP
SP
SP
SP
U
L
U
L
L)/3.8 µA (s)
SP
L)/36 µA (s)
TB6575FNG
SP
changes
2008-9-11