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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： | 11/29页 |
| 文件大小： | 275K |
| 代理商： | L9935 |
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L9935
Functional description
5.12
Limitation of the diagnosis
The diagnosis depends on either detecting an overcurrent of more than typically 1.8 A
through the source transistor or on not detecting a flyback pulse, or on detecting severe
overcurrents of the sink transistor immediately 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 reversal at hold current.
●
In the low current range (hold current) the current capability of the bridge is reduced on
purpose. Short to VS may not be detected. In stead the bridge may just chop like
normal operation.
●
Flyback pulse detection is not blanked during PWM regulation at hold current (here
commutation voltage is less than 1V thus providing a longer pulse duration.) This
however should be taken in account using stepper motors with low inductivity (less than
0.5mH). Using motors with such a low inductivity 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 during flyback approaches zero while at bridge turn on the current will
increase. This may lead to overcurrent detection. We suggest to use stepper motors
with an ohmic resistance of approximately 3
Ω or more.
Partial shorts of windings or shorts of stepper motors with coils in series may still yield a
flyback pulses that are accepted by the diagnosis as a proper signal.
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.
5.13
Serial data interface (SPI)
The serial data interface itself consists of the pins SCL (serial clock), SDI (serial data input)
and SDO (serial data output).
To especially support bus controlled applications the additional signals EN (chip enable not)
and CSN (chip select not) are available.
Table 8.
Diagnosis description - bit7 and bit6
Error 1 bit7 Error 2 bit6
Description
H
Normal operation
L
H
Short to VS (sink overload immediately after turn on) shorted load (no
flyback) open load (no flyback)
H
L
short to gnd (source overload, missing flyback is masked)
L
over temperature pre alarm
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| L9935013TR | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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