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参数资料
| 型号： | L6226PD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.8 A, PDSO36 |
| 封装： | POWER, SO-36 |
| 文件页数： | 5/31页 |
| 文件大小： | 525K |
| 代理商： | L6226PD |
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L6226
Circuit description
Doc ID 9452 Rev 4
13/31
4.3
Non-dissipative overcurrent detection and protection
An overcurrent detection circuit (OCD) is integrated. This circuit can be used to provides
protection against a short circuit to ground or between two phases of the bridge as well as a
roughly regulation of the load current. With this internal over current detection, the external
current sense resistor normally used and its associated power dissipation are eliminated.
Figure 9 shows a simplified schematic of the overcurrent detection circuit for the Bridge A.
Bridge B is provided of an analogous circuit.
To implement the over current detection, a sensing element that delivers a small but precise
fraction of the out-put current is implemented with each high side power MOS. Since this
current is a small fraction of the output current there is very little additional power
dissipation. This current is compared with an internal reference cur-rent IREF. When the
output current reaches the detection threshold Isover the OCD comparator signals a fault
condition. When a fault condition is detected, an internal open drain MOS with a pull down
capability of 4 mA connected to OCD pin is turned on. Figure 10 shows the OCD operation.
This signal can be used to regulate the output current simply by connecting the OCD pin to
EN pin and adding an external R-C as shown in Figure 9. The off time before recovering
normal operation can be easily programmed by means of the accurate thresholds of the
logic inputs.
IREF and, therefore, the output current detection threshold are selectable by RCL value,
following the equations:
●
Isover = 2.8A ±30% at -25°C < Tj < 125 °C if RCL = 0 Ω (PROGCL connected to GND)
●
Isover = 11050 / RCL ±10% at -25 °C < Tj < 125 °C if 5 kΩ < RC < 40 kΩ
to 40 k
Ω.
The disable time tDISABLE before recovering normal operation can be easily programmed by
means of the accurate
thresholds of the logic inputs. It is affected whether by CEN and REN values and its
an overcurrent has been detected depends only by CEN value. Its magnitude is reported in
CEN is also used for providing immunity to pin EN against fast transient noises. Therefore
the value of CEN should be chosen as big as possible according to the maximum tolerable
delay time and the REN value should be chosen according to the desired disable time.
The resistor REN should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended
values for REN and CEN are respectively 100 kΩ and 5.6 nF that allow obtaining 200 s
disable time.
相关PDF资料 |
PDF描述 |
|---|---|
| L6226QTR | BRUSH DC MOTOR CONTROLLER, QCC32 |
| L6226Q | BRUSH DC MOTOR CONTROLLER, 2.8 A, QCC32 |
| L6227N | STEPPER MOTOR CONTROLLER, 2.8 A, PDIP24 |
| L6228Q | STEPPER MOTOR CONTROLLER, 2.8 A, QCC32 |
| L6228QTR | STEPPER MOTOR CONTROLLER, QCC32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6226PDTR | 功能描述:马达/运动/点火控制器和驱动器 Dual Full 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 |
| L6226Q | 功能描述:功率驱动器IC DMOS Full Bridge Driver 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 |
| L6226Q_10 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DMOS dual full bridge driver |
| L6226QTR | 功能描述:功率驱动器IC DMOS Full Bridge Driver 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 |
| L6227 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DMOS DUAL FULL BRIDGE DRIVER WITH PWM CURRENT CONTROLLER |
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