tb62202afg TOSHIBA Semiconductor CORPORATION, tb62202afg Datasheet - Page 68

• Manufacturer Part Number: tb62202afg
• Description: Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

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 non-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
(basic chopping waveform)
Point where overcurrent flows to output transistors (overcurrent status start)
(Non-sensitivity time)
ISD BLANK time
CR oscillation
M
68
power supply for protection.
MIN
ISD operating time
MIN
Output halts (Reset status)
MAX
TB62202AFG
MAX
2005-04-04