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參數(shù)資料
| 型號： | L9935 |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | TWO-PHASE STEPPER MOTOR DRIVER |
| 中文描述： | 兩相步進電機驅(qū)動器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 159K |
| 代理商： | L9935 |
Using 75mA choppingimmediatelly after stand by:
The high resistive motor can be forced to choppingoperation in the low current range. This leads to the
samebehaviouras using a low resistive motor.
Short to V
S
detectionusing high resistive motors:
The short to VS flag is overwritten each time the chopper comparator responds.Having detected a short
this flagonly can be reset by reachingchopping operationor resetting the circuit (ENN=1). For a highre-
sistive motor thisleads to the following consequence: Once a short to VS is detected the error flag will
persist even if the short is removedagain until either a reset (ENN=1) or chopping(for example in 75mA
mode) has taken place. We suggest to return to operation once a short to VS was detected by using the
low currentmode to reset the flag.
Limitation of the Diagnosis
The diagnosis depends on either detecting an overcurrent of more than typically 1.8A through the
source transistor or on not detecting a flyback pulse, or on detecting severe overcurrents of the sink
transistorimmediately after turn on.
Small currents bypassing the load will not be detected.
In the low current range (hold current) the flyback pulse (especially commutating against the supply
voltage after changing phase) may (depending on the inductivity of the stepper motor windings) be
too short to be detected correctly. For this reason diagnosis using the flyback pulse is blanked at
phase reversalat hold current.
In the low current range (hold current) the current capability of the bridge is reduced on purpose.
Short to VS maynot be detected.In stead the bridge may just chop like normal operation.
Flyback pulse detection is not blanked during PWM regulation at hold current
voltage is less than 1V thus providing a longer pulse duration.) This however should be taken in ac-
count using stepper motors with low inductivity (less than 0.5mH). Using motors with such a low in-
ductivity the flyback voltage in hold mode may decay too fast.
Motors with extremely low ohmic resistance tend to pump up the current because current decay dur-
ing flyback approaches zero while at bridge turn on the current will increase. This may lead to over-
current detection.We suggest to use stepper motors with an ohmic resistanceof approximately 3
or
more.
Partial shorts of windings or shorts of stepper motors with coils in series may still yield a flyback pulses
that are acceptedby the diagnosisas a proper signal.
Table 2. Error table.
(here commutation
Error 1
bit7
H
L
Error 2
bit6
H
H
Description
Normal operation
Short to VS (sink overload immediately after turn on)
shorted load (no flyback)
open load (no flyback)
short to gnd (source overload, missing flyback is masked)
overtemperature prealarm
H
L
L
L
At stepping rates faster than 1ms/data transfer error flags indicating a short should be used to initiate a
pause of at least 1ms to allow the power bridges to cool down again.
L9935
11/19
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| L9935013TR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 2-Ph Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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| L993CG-1 | 制造商:Thomas & Betts 功能描述:1 INCH LR CONDUIT BODY W/CVR & GASK |
| L9942 | 制造商:STMicroelectronics 功能描述: |
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