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參數(shù)資料
| 型號： | L9935 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | TWO-PHASE STEPPER MOTOR DRIVER |
| 中文描述： | 兩相步進(jìn)電機(jī)驅(qū)動器 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 159K |
| 代理商： | L9935 |
Diagnosisof a Shortto VS
During the short current through the sink transistor will rise more rapidly than under normal load condi-
tions. Reaching a peak current of 1.5 times the maximum PWM current between typically 2
μ
s and 5
μ
s
after turn on will be detectedas a short to V
S
.
Detecting a short the low side transistor will try to turn on again the next 7 trigger pulse of the oscillator.
Simultaneouslythe error flagwill updated on eachpulse.
t
t
ON
I
Q
short threshold
t
on
:
t
on
+ t
1
= t
short
:
t
on
+ t
delay
= t
PWM
: activation of PWM threshold
turn on of the sink
transistor
activation of short
threshold
PWM threshold
PWM
detection
signal (internal)
Short
detection
signal (internal)
Error 1
t
short
t
PWM
t
ON
t
ON
t
ON
t
short
t
short
t
PWM
t
short
t
PWM
t
PWM
t
t
t
D99AT422
Figure 6. NormalPWM current versus short circuit current and detection of short to VS..
Between t
on
and t
short
the overcurrent detectionis totally blanked.
Between t
short
and t
PWM
the current threshold is set to 1.5 times the maximum PWM current (1.5 times
the current of current setting LL).
Overcurrentnow will set the error flag.
After t
PWM
the current threshold is the nominal PWM current set by the external resistor. Exceeding this
current will just turn off the sink transistor. This is considered as normal operation. The error flag is de-
tachedfrom the comparatorafter tPWM so no error flag is set during normal pulse width modulation.
Short from an Output to Ground
The current throughthe short will be detected by the protectionof the source transistor.The source tran-
sistor 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 PWMregulator should be set to a maximum value of 1.1A.
L9935
9/19
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| L9947 | QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER |
| L9947S | QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER |
| L9949 | DOOR ACTUATOR DRIVER |
| L9950 | DOOR ACTUATOR DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L9935013TR | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L9936 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DC Motor Controller/Driver |
| L9937 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:FULL BRIDGE MOTOR DRIVER |
| 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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