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参数资料
| 型号： | L6229Q |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS 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： | 5/28页 |
| 文件大小： | 521K |
| 代理商： | L6229Q |
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L6229Q
Circuit description
Doc ID 15209 Rev 3
13/28
5.3
PWM current control
The L6229Q includes a constant off time PWM current controller. The current control circuit
senses the bridge current by sensing the voltage drop across an external sense resistor
connected between the source of the three lower power MOS transistors and ground, as
shown in Figure 9. As the current in the motor increases 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 pin VREF 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 around the upper half of the bridge in slow
decay mode as 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 tOFF is the sum of the
monostable time plus the dead time.
Figure 10 shows the typical operating waveforms of the output current, the voltage drop
across the sensing resistor, the pin RC 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 turn on, a high peak current flows through the sense
resistor due to the reverse recovery of the freewheeling diodes. The L6229Q provides a 1 s
blanking time tBLANK that inhibits the comparator output so that the current spike cannot
prematurely re trigger the monostable.
Figure 9.
PWM current controller simplified schematic
DRIVERS
+
DEAD TIME
S
Q
R
DRIVERS
+
DEAD TIME
DRIVERS
+
DEAD TIME
OUT3
OUT2
SENSEB
SENSEA
RSENSE
D02IN1380
RCOFF
ROFF
COFF
VREF
OUT1
+
-
1
μs
5mA
BLANKER
SENSE
COMPARATOR
MONOSTABLE
SET
2.5V
5V
FROM THE
LOW-SIDE
GATE DRIVERS
BLANKING TIME
MONOSTABLE
VSB
VS
VSA
TO GATE
LOGIC
(0)
(1)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6229QTR | 功能描述:马达/运动/点火控制器和驱动器 DMOS driver 3-phrase 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 |
| L622C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|240V V(RRM)|46A I(T) |
| L622-DBC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:L series PRTDs, type L 622 DBC are designed for large volume applications where longterm stability |
| L622DY | 制造商:VCC 功能描述:LED CIRCUIT BOARD INDICATOR |
| L622F | 功能描述:分立半导体模块 SCR/DIODE MODULE 240VAC 42.5ADC 600VP RoHS:否 制造商:Infineon Technologies 产品:Thyristor Power Modules 类型:Phase Controls 安装风格:Screw 封装 / 箱体:DT61 封装: |
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