tb62201afg TOSHIBA Semiconductor CORPORATION, tb62201afg Datasheet - Page 70
tb62201afg
Manufacturer Part Number
tb62201afg
Description
Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TB62201AFG.pdf
(89 pages)
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Operating Time for Overcurrent Protector Circuit
(ISD non-sensitivity time and ISD operating time)
A non-sensitivity time is set for the overcurrent protector circuit to avoid misdetection of overcurrent due to spike
current at irr or switching.
The non-sensitivity time synchronizes with the frequency of the CR for setting the chopping frequency. The
non-sensitivity time is set as follows :
The time required for the ISD to actually operate after the no-sensitivity time is as follows :
Therefore, from the time overcurrent flows to the output transistors to the time output halts is as follows.
Note that ideally, the operating time is the operating time when overcurrent flows. Depending on the output control
mode timing, the overcurrent protector circuit may not be triggered.
Therefore, to ensure safe operation, add a fuse to the V
The fuse capacity would vary according to the use conditions. However, select a fuse whose capacity avoids any
operating problems and does not exceed the power dissipation for the IC.
Non-sensitivity time = 4 × CR cycle
Minimum: 5 × CR cycle
Maximum: 8 × CR cycle
Point where overcurrent flows to output transistors (overcurrent status start)
(Non-sensitivity time)
ISD BLANK time
M
70
power supply for protection.
min
ISD operating time
min
Output halts (Reset status)
(basic chopping
CR oscillation
waveform)
max
TB62201AFG
max
2005-04-04
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