TB6588FG Toshiba, TB6588FG Datasheet - Page 11

• 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

12. Overcurrent Protection Circuit
The overcurrent protection circuit limits the current by turning the high-side output transistors off. The
output current is monitored as a voltage across R
protection functionality is enabled.
The current value that trips the overcurrent protection circuit is calculated as:
I
R
protection circuit due to the PWM switching noise.
Example: When R
Note: The overcurrent protection circuit (normally a current limiter) is not intended to provide protection against
OUT
2
and C
= Overcurrent detection voltage V
all abnormal conditions. Therefore, the TB6588FG should exit the abnormal state immediately after the
overcurrent protection circuit is enabled.
If the device is used beyond the maximum ratings, the overcurrent protection circuit may not operate
properly, or the device may break down before the protection circuit is activated.
Also, if the overcurrent still persists after the protection circuit is activated, the device may be destroyed
due to overheating.
If the overcurrent protection circuit remains active, the timing of the position detection that is performed
synchronously with the PWM signal changes. Thus, the motor may lose synchronization. Therefore, the
overcurrent protection circuit must be configured not to operate under normal operation.
2
used as an RC filter should be adjusted properly to prevent the malfunction of the overcurrent
1
= 0.33 [Ω], I
V
OC
= 0.5 V
TB6588FG
OUT
(typ.) = 0.5 [V] (typ.)/0.33 [Ω] ∼ − 1.5 [A]
200 kΩ
(Note)
OC
C
/Resistor value R
2
OC
VM3
11
1
IR3
. If it exceeds the rated V
R
2
VM1
R
IR1
1
1
VM2
I
IR2
OUT
W
U
V
OC
voltage (0.5 V (typ.)), the
TB6588FG
2008-4-25