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参数资料
| 型号： | L9942XPTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24 |
| 封装： | LEAD FREE, POWER, SSO-24 |
| 文件页数： | 2/40页 |
| 文件大小： | 664K |
| 代理商： | L9942XPTR |
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Device description
L9942
switched off to protect the device. In order to reactivate the output stages the junction
temperature must decrease below Tj SD -Tj SD HYS and the thermal shutdown bit has to be
cleared by the microcontroller.
2.6
Inductive Loads
Each half bridge is built by an internally connected highside and a lowside power DMOS
transistor. Due to the built-in reverse diodes of the output transistors, inductive loads can be
driven without external free-wheeling diodes. In order to reduce the power dissipation during
free-wheeling condition the PWMcontroller will switch-on the output transistor parallel to the
freewheeling diode (synchronous rectification).
2.7
Cross-current protection
The four half-brides of the device are cross-current protected by an internal delay time
depending on the programmed slew rate. If one driver (LS or HS) is turned-off then
activation of the other driver of the same half bridge will be automatically delayed by the
cross-current protection time .
2.8
PWM Current Regulation
An internal current monitor output of each high-side and low-side transistor sources a
current image which has a fixed ratio of the instantaneous load current. This current images
are compared with the current limit in PWM control. Range of limit can reach from
programmed full scale value (register1 DAC Scale) down belonging LSB value of 5 bit DAC
(register1 DAC Phase x). The data of the two 5 bit DACs comes form set up in 9 current
profiles (register2 to 6). If signal changes to logic high at pin STEP then 2 currentprofiles are
moved in register1 for DAC Phase A and B. Number of profile depends on phase counter
reading and direction bit in register0 (Figure 7). The bridges are switched on until the load
current sensed at HS switch exceeds the limit . Load current comparator signal is used to
detect open load or overcurrent condition also.
2.9
Decay modes
During off-time the device will use one of several decay modes programmable by SPI
(Figure 4 top). In slow decay mode HS switches are activated after cross current protection
time for synchronous rectification to reduce the power dissipation (Figure 4 detail A). In fast
decay opposite halfbridge will switched on after cross current protection time, that is same
like change in the direction. For mixed decay the duration of fast decay period before slow
decay can be set to a fixed time (Figure 4 detail B continuous line ) or is triggered by under-
run of the load current limit (Figure 4 detail B dashed line), that can be detected at LS
switch. The special mode where the actual phase counter value is taken into account to
select the decay mode is called auto decay (e.g. in Figure 3 Micro Stepping DIR=1). If the
absolute value of the current limit is higher as during step before then PWM control uses
slow decay mode always. Otherwise one of the fast decay modes is automatic selected for a
quick decrease of the load current and so it obtains new lower target value.
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相关代理商/技术参数 |
参数描述 |
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| L9946 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC Motor Controller/Driver |
| L9947 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER |
| L9947L | 制造商:STMicroelectronics 功能描述: |
| L9947S | 功能描述:马达/运动/点火控制器和驱动器 Quad Half Bridge 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 |
| L9949 | 功能描述:功率驱动器IC Door Actuator RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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