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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： | 4/27页 |
| 文件大小： | 435K |
| 代理商： | L6227Q |
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Circuit description
L6227Q
12/27
4.3
Truth table
4.4
PWM current control
The L6227Q includes a constant off time PWM current controller for each of the two bridges.
The current control circuit senses the bridge current by sensing the voltage drop across an
external sense resistor connected between the source of the two lower power MOS
transistors and ground, as shown in Figure 9. As the current in the load builds up the voltage
across the sense resistor increases proportionally. When the voltage drop across the sense
resistor becomes greater than the voltage at the reference input (VREF
A or VREFB) the
sense comparator triggers the monostable switching the low-side MOS off. The low-side
MOS remain off for the time set by the monostable and the motor current recirculates in the
upper path. When the monostable times out the bridge will again turn on. Since the internal
dead time, used to prevent cross conduction in the bridge, delays the turn on of the power
MOS, the effective off time is the sum of the monostable time plus the dead time.
Figure 9.
PWM current controller simplified schematic
Table 7.
Truth table
Inputs
Outputs
Description (1)
1.
Valid only in case of load connected between OUT1 and OUT2
EN
IN1
IN2
OUT1
OUT2
LX (2)
2.
X = don't care
X
High Z (3)
3.
High Z = high impedance output
High Z
Disable
H
L
GND
Brake mode (lower path)
H
L
Vs
GND (Vs)
Forward
H
L
H
GND (Vs) (4)
4.
GND (Vs) = GND during Ton, Vs during Toff
Vs
Reverse
H
Vs
Brake mode (upper path)
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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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