參數(shù)資料
型號(hào): TB62202AFG
廠商: Toshiba Corporation
英文描述: Dual-Stepping Motor Driver IC for OA Equipment Using PWM Chopper Type
中文描述: 雙辦公自動(dòng)化設(shè)備步進(jìn)馬達(dá)驅(qū)動(dòng)IC用PWM斬波型
文件頁(yè)數(shù): 68/84頁(yè)
文件大?。?/td> 1272K
代理商: TB62202AFG
TB62202AFG
2005-04-04
68
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 :
Non-sensitivity time
=
4
×
CR cycle
The time required for the ISD to actually operate after the non-sensitivity time is as follows :
Minimum: 5
×
CR cycle
Maximum: 8
×
CR cycle
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
M
power supply for protection.
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.
Point where overcurrent flows to output transistors (overcurrent status start)
Output halts (Reset status)
CR oscillation
(basic chopping waveform)
(Non-sensitivity time)
ISD BLANK time
MIN
MAX
ISD operating time
MIN
MAX
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