參數(shù)資料
型號(hào)： E-L9935013TR
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20
封裝： ROHS COMPLIANT, POWER, MO-166, SOP-20
文件頁(yè)數(shù)： 9/29頁(yè)
文件大?。?/td> 311K
代理商： E-L9935013TR
L9935
Functional description
5.6
Short from an output to ground
The current through the short will be detected by the protection of the source transistor. The
source transistor will turn off exceeding a current of typically 1.8A. Minimum overload
detection current is 1.2A. To obtain proper current regulation (by the sink transistors and not
by source transistor shut down) the maximum current of the PWM regulator should be set to
a maximum value of 1.1A.
5.7
Diagnosis of a short to ground
Detecting an overload will set an overcurrent error (Error2 = LOW) (bit6). To reset the error
flag a new byte must be written into the interface. (Reset of the error flag takes place at the
rising slope of CSN).
5.8
Shorted load
With a shorted load both, the sink- and the source protection or the PWM alone will
respond. In either case there will be no flyback pulse.
5.9
Diagnosis of a shorted load
Shorting the load two events may take place:
–
overload (of the high side transistor) while low side transistor overcurrent is
detected will set the following combinations:
bit6 = LOW
bit7 = HIGH
–
overload is marginal. So the low side driver may turn off before overload is
detected. This leads to the combination bit6 = HIGH and bit7 = LOW.
5.10
Open load
An open load will not lead to any flyback pulses. Error detection will take advantage of the
flyback pulse. Missing the flyback pulse after reversing the polarity of a motor winding bit7
will become LOW.
Open load will not be tested in the low current mode (current bits HL) to avoid the risk of
instable diagnosis at low flyback currents. Open load immediately after reset or power down
may on random be detected in the low current mode too. This diagnosis however will not
persist longer than 8 changes of polarity.
We strongly suggest to test open load at a high current mode (combination LL).
While circuit clock speed passes the stepper motor resonant points during
acceleration/deceleration phase, it can happen that flyback energy is temporarily insufficient
for a proper open load detection. Under specific circumstances, pending on motor and load
characteristics, this could lead to sporadic faulty open load error messages despite proper
system operation. The recommended solution is an appropriate software filter approach.
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