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参数资料
| 型号： | L6228QTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件页数： | 5/32页 |
| 文件大小： | 491K |
| 代理商： | L6228QTR |
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L6228Q
Circuit description
Doc ID 14321 Rev 4
13/32
4.3
PWM current control
The L6228Q 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 12. As the current in the motor 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
VREF
B) the sense comparator triggers the monostable switching the bridge off. The power
MOS remain off for the time set by the monostable and the motor current recirculates as
defined by the selected decay mode, described in the next section. 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 12.
PWM current controller simplified schematic
Figure 13 shows the typical operating waveforms of the output current, the voltage drop
across the sensing resistor, the RC pin voltage and the status of the bridge. More details
regarding the Synchronous Rectification and the output stage configuration are included in
the next section.
Immediately after the power MOS turns on, a high peak current flows through the sensing
resistor due to the reverse recovery of the freewheeling diodes. The L6228Q provides a 1
μs
blanking time t
BLANK that inhibits the comparator output so that this current spike cannot
prematurely re-trigger the monostable.
DRIVERS
+
DEAD TIME
S
Q
R
DRIVERS
+
DEAD TIME
2H
1H
2L
1L
OUT2A(or B)
SENSEA(or B)
RSENSE
D01IN1332
RCA(or B)
ROFF
COFF
VREFA(or B)
IOUT
OUT1A(or B)
+
-
1
μs
5mA
BLANKER
SENSE
COMPARATOR
OUTPUT
MONOSTABLE
SET
2.5V
5V
FROM THE
LOW-SIDE
GATE DRIVERS
2 PHASE
STEPPER MOTOR
BLANKING TIME
MONOSTABLE
VSA (or B)
TO GATE LOGIC
(0)
(1)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6229 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR |
| L6229D | 功能描述:马达/运动/点火控制器和驱动器 3-Phase DC 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 |
| L6229DP | 功能描述:马达/运动/点火控制器和驱动器 3-Phase DC 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 |
| L6229DPTR | 功能描述:马达/运动/点火控制器和驱动器 3-Phase DC 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 |
| L6229DTR | 功能描述:马达/运动/点火控制器和驱动器 3-Phase DC 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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