TB6588FG Toshiba, TB6588FG Datasheet - Page 6

• Manufacturer Part Number: TB6588FG
• Description: IC PWM DRVR 3PH DC MOTOR 36HSOP
• Manufacturer: Toshiba
• Type: 3 Phase Full Wave PWM Driver for Sensorless DC Motorsr

Specifications of TB6588FG

• Applications: DC Motor Driver, Brushless (BLDC), 3 Phase
• Number Of Outputs: 1
• Current - Output: 1.5A
• Voltage - Load: 7 V ~ 42 V
• Voltage - Supply: 7 V ~ 42 V
• Operating Temperature: -30°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 36-HSOP
• Product: Fan / Motor Controllers / Drivers
• Operating Supply Voltage: 24 V
• Supply Current: 8 mA
• Mounting Style: SMD/SMT
• Function: Driver
• Vopmax (vm*): 24V (50V)
• Io (lpeak): 2.5A
• Sinusoidal Current Wave: no
• Sensor-less: yes
• Speed Feedback Loop: no
• Package: HSOP36
• Rohs Compatible†: yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

driving high-side
driving low-side
Motor terminal
3. SC Signal Delay in Rotational Speed Control (V
4. Forced Commutation Frequency
5. PWM Frequency
PWM signal
PWM signal
transistors
transistors
The rotational speed and the starting and stopping of the motor are controlled based on an analog voltage at
the V
The voltage at the SC pin equals the charging voltage of the capacitor C
charging/discharging time of C
the voltage at the V
•
•
Note: When the motor is stopped (V
The forced commutation frequency at startup is determined as follows.
Since the optimal frequency varies depending on the motor type and load, it must be adjusted
experimentally.
The forced commutation frequency is determined by the value of external capacitor and resistor, and the
logic level of the FST1 and FST2 pins (These pins have a pull-down resistor).
The PWM frequency is determined by the value of the external capacitor and resistor, and the logic level of
the FPWM pin (which has a pull-down resistor).
The PWM frequency must be sufficiently high relative to the electrical frequency of the motor and within
the range permitted by the driver circuit.
The PWM turn the high-side output transistors off.
voltage
Charging time of C
Discharging time of C
FST2: FST1 = H
FST2: FST1 = H
FST2: FST1 = L or Open : H
FST2: FST1 = L or Open : L or Open : Forced commutation frequency f
FPWM: H or Open: f
FPWM: L or Open: f
SP
(The C
input. However, the actual operation of the IC is determined by the voltage applied to the SC pin.
1
is discharged through 2 kΩ (typ.) to GND.)
VSP
SC
SP
1
pin rises from 1 to 4 V, the SC signal delay occurs as shown below.
PWM
PWM
(when accelerating): T
1
(when decelerating): T
= f
= f
: H
: L or Open : Forced commutation frequency f
1
osc
. This causes a delay in the SC voltage level relative to the V
osc
/256
T
/128
SP
UP
< 1 V), the capacitor C
: Forced commutation frequency f
: Forced commutation frequency f
UP
6
DOWN
(typ.) = C
(typ.) = C
SP
1
1
× (V
at the SC pin is instantly discharged.
follow-up property of SC)
SPU
1
× (V
− V
SPU
1
, which is determined by the
SPL
T
− V
DOWN
ST
ST
ST
ST
)/4.5 µA (s)
SPL
∼ − f
∼ − f
∼ − f
∼ − f
osc
osc
osc
osc
)/37 µA (s)
/(6 × 2
/(6 × 2
/(6 × 2
/(6 × 2
V
V
V
V
SPU
SPL
SPU
SPL
16
17
18
19
TB6588FG
SP
)
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2008-4-25
input. When