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参数资料
| 型号： | L6227Q |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 2.8 A, QCC32 |
| 封装： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件页数： | 8/27页 |
| 文件大小： | 435K |
| 代理商： | L6227Q |
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Circuit description
L6227Q
16/27
4.6
Non-dissipative overcurrent protection
The L6227Q 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 current sense resistor normally used and its
associated power dissipation are eliminated. Figure 14 shows a simplified schematic of the
overcurrent detection circuit.
To implement the over current detection, a sensing element that delivers a small but precise
fraction of the output 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 current IREF. When the
output current in one bridge reaches the detection threshold (typically 2.8 A) the relative
OCD comparator signals a fault condition. When a fault condition is detected, the EN pin is
pulled below the turn off threshold (1.3 V typical) by an internal open drain MOS with a pull
down capability of 4 mA. By using an external 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 14.
Overcurrent protection simplified schematic
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 k to 180 k. Recommended
values for REN and CEN are respectively 100 k and 5.6 nF that allow obtaining 200 s
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
FROM THE
BRIDGE B
OCD
COMPARATOR
OCD
COMPARATOR
TO GATE
LOGIC
INTERNAL
OPEN-DRAIN
RDS(ON)
40
TYP.
CEN.
REN.EN
VDD
C or LOGIC
D01IN1337
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| L6228D | 功能描述:马达/运动/点火控制器和驱动器 DMOS 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 |
| L6228DTR | 功能描述:马达/运动/点火控制器和驱动器 DMOS 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 |
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