tb62212ftag TOSHIBA Semiconductor CORPORATION, tb62212ftag Datasheet - Page 25

• Manufacturer Part Number: tb62212ftag
• Description: Pwm Chopper Type Dual-stepping Motor Driver
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Operating Time for Over-current Detection Circuit
ISD Dead Band Time and ISD Operating Time
at switching. The dead band time being synchronized with the frequency of the OSC for setting chopping
frequency is expressed as follows.
Depending on the timing of output control mode, the circuit may not be triggered.
not exceed the power dissipation for the IC to avoid any operating problems.
The over-current detection circuit has a dead band time to prevent erroneous detection of I
Time required to stop the output after over-current flows into the output stage is expressed as follows.
Note that the above-mentioned operating times are achieved only when over-current flows as it is expected.
Thus, to ensure safe operation, please insert a fuse in the motor power supply.
The capacity of the fuse is determined according to the usage conditions. Please select one whose capacity does
Dead band time = 4 × OSC cycle
Minimum time = 5 × OSC cycle (Including the maximum value of synchronization time of one OSC cycle)
Maximum time = 8 × OSC cycle
When over-current starts to flow into the output stage (Over-current state starts)
(Chopping reference waveform)
(Dead band time)
ISD blank time
OSC
25
Min
ISD operating time
Output stops (Reset mode)
Max
TB62212FTAG
RR
or spike current
2010-10-05