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参数资料
| 型号： | L6227PD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.8 A, PDSO36 |
| 封装： | POWER, SO-36 |
| 文件页数： | 5/22页 |
| 文件大小： | 389K |
| 代理商： | L6227PD |
13/22
L6227
NON-DISSIPATIVE OVERCURRENT PROTECTION
The L6227 integrates an Overcurrent Detection Circuit (OCD). This circuit provides protection against a short
circuit to ground or between two phases of the bridge. With this internal over current detection, the external cur-
rent sense resistor normally used and its associated power dissipation are eliminated. Figure 12 shows a sim-
plified schematic of the overcurrent detection 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 in one bridge reaches the detection threshold (typically 2.8A) the relative
OCD comparator signals a fault condition. When a fault condition is detected, the EN pin is pulled below the turn
off threshold (1.3V typical) by an internal open drain MOS with a pull down capability of 4mA. By using an ex-
ternal R-C on the EN pin, the off time before recovering normal operation can be easily programmed by means
of the accurate thresholds of the logic inputs.
Figure 12. Overcurrent Protection Simplified Schematic
Figure 13 shows the Overcurrent Detection operation. The Disable Time tDISABLE before recovering normal oper-
ation 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 magnitude is reported in Figure 14. 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 15.
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.
+
OVER TEMPERATURE
IREF
(I1A+I2A) / n
I1A / n
POWER SENSE
1 cell
POWER SENSE
1 cell
POWER DMOS
n cells
POWER DMOS
n cells
HIGH SIDE DMOSs OF
THE BRIDGE A
OUT1A
OUT2A
VSA
I1A
I2A
I2A / n
OCD
COMPARATOR
TO GATE
LOGIC
INTERNAL
OPEN-DRAIN
RDS(ON)
40
TYP.
CEN
REN
ENA
+5V
C or LOGIC
D02IN1353
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6227PDTR | 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 |
| L6227Q | 功能描述:功率驱动器IC DMOS DUAL FULL Bridge w/ PWM 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 |
| L6227Q_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DMOS dual full bridge driver with PWM current controller |
| L6227QTR | 功能描述:功率驱动器IC DMOS DUAL FULL Bridge w/ PWM 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 |
| L6228 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DMOS DRIVER FOR BIPOLAR STEPPER MOTOR |
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