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參數(shù)資料
| 型號： | L6228DTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.8 A, PDSO24 |
| 封裝： | SO-24 |
| 文件頁數(shù)： | 3/28頁 |
| 文件大小： | 589K |
| 代理商： | L6228DTR |
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L6228
PWM CURRENT CONTROL
The L6228 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 be-
tween the source of the two lower power MOS transistors and ground, as shown in Figure 10. 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 (VREFA or VREFB) 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 pre-
vent 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 10. PWM Current Controller Simplified Schematic
Figure 11 shows the typical operating waveforms of the output current, the voltage drop across the sensing re-
sistor, 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 L6228 provides a 1
s Blanking Time tBLANK 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
s
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6228N | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 DMOS Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6228PD | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 DMOS Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6228PD013TR | 制造商:STMicroelectronics 功能描述:DMOS DRIVER FOR BIPOLAR STEPPER - Tape and Reel |
| L6228PDTR | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 DMOS Stepper Motor RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| L6228Q | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 DMOS Dual Full Bridge w/ PWM RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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