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参数资料
| 型号： | L6226PDTR |
| 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： | 24/24页 |
| 文件大小： | 547K |
| 代理商： | L6226PDTR |
9/22
L6226
NON-DISSIPATIVE OVERCURRENT DETECTION AND PROTECTION
In addition to the PWM current control, 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 resis-
tor normally used and its associated power dissipation are eliminated. Fig. 7 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 4mA
connected to OCD pin is turned on. Fig. 8 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 Fig.7. 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 (PROGCL connected to GND)
– Isover =
±10% at -25°C < Tj < 125°C if 5K < RC < 40k
Fig. 9 shows the output current protection threshold versus RCL value in the range 5k to 40k.
The Disable Time tDISABLE before recovering normal operation can be easily programmed by means of the accu-
rate thresholds of the logic inputs. It is affected whether by CEN and REN values and its magnitude is reported in
Figure 10. The Delay Time tDELAY before turning off the bridge when an overcurrent has been detected depends
only by CEN value. Its magnitude is reported in Figure 11.
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 2.2K to 180K. Recommended values for REN and CEN
are respectively 100K
and 5.6nF that allow obtaining 200s Disable Time.
11050
R
CL
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相关代理商/技术参数 |
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| 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 |
| L6227D | 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 |
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