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参数资料
| 型号： | L9935 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20 |
| 封装： | LEAD FREE, POWER, MO-166, SOP-20 |
| 文件页数： | 8/29页 |
| 文件大小： | 275K |
| 代理商： | L9935 |
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Functional description
L9935
8 times. After having detected short 8 times the low side transistor will remain off until the
next data transfer took place. After detection of a short to VS we suggest to turn off the
corresponding bridge to reduce power dissipation for at least 1ms.
5.5
Diagnosis of a short to VS
During the short current through the sink transistor will rise more rapidly than under normal
load conditions. Reaching a peak current of 1.5 times the maximum PWM current between
typically 2 s and 5 s
after turn on will be detected as a short to VS.
Detecting a short the low side transistor will try to turn on again the next 7 trigger pulse of
the oscillator.
Simultaneously the error flag will updated on each pulse.
Figure 8.
Normal PWM current versus short circuit current and detection of short
to VS.
Between ton and tshort the over current detection is totally blanked.
Between tshort and tPWM the current threshold is set to 1.5 times the maximum PWM current
(1.5 times the current of current setting LL).
Overcurrent now will set the error flag.
After tPWM 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 detached from the comparator after tPWM so no error flag is set
during normal pulse width modulation.
t
tON
IQ short threshold
ton :
turn on of the sink transistor
ton + t1 = tshort :
activation of short threshold
ton + tdelay = tPWM : activation of PWM threshold
PWM threshold
PWM detection
signal (internal)
Short detection
signal (internal)
Error 1
tshort tPWM
tON
tshort
tshort tPWM
tPWM
t
D99AT422
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相关代理商/技术参数 |
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| L9935013TR | 功能描述:马达/运动/点火控制器和驱动器 2-Ph Stepper Motor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L9936 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC Motor Controller/Driver |
| L9937 | 制造商:STMICROELECTRONICS 制造商全称: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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