參數(shù)資料
型號(hào)： LMD18245MWC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 6 A, UUC
封裝： WAFER
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 664K
代理商： LMD18245MWC
Functional Descriptions (Continued)
THE LMD18245 CHOPPER AMPLIFIER
The LMD18245 incorporates all the circuit blocks needed to
implement a fixed off-time chopper amplifier. These blocks
include: an all DMOS, full H-bridge with clamp diodes, an
amplifier for sensing the load current, a comparator, a
monostable, and a DAC for digital control of the chopping
threshold. Also incorporated are logic, level shifting and drive
blocks for digital control of the direction of the load current
and braking.
THE H-BRIDGE
The power stage consists of four DMOS power switches and
associated body diodes connected in an H-bridge configura-
tion (
Figure 2 ). Turning ON a source switch and a sink
switch in opposite halves of the bridge forces the full supply
voltage less the switch drops across the motor winding.
While the bridge remains in this state, the winding current in-
creases exponentially towards a limit dictated by the supply
voltage, the switch drops, and the winding resistance. Sub-
sequently turning OFF the sink switch causes a voltage tran-
sient that forward biases the body diode of the other source
switch. The diode clamps the transient at one diode drop
above the supply voltage and provides an alternative current
path. While the bridge remains in this state, it essentially
shorts the winding and the winding current recirculates and
decays exponentially towards zero. During a change in the
direction of the winding current, both the switches and the
body diodes provide a decay path for the initial winding cur-
rent (
Figure 3 ).
DS011878-10
DS011878-11
FIGURE 2. The DMOS H-Bridge
DS011878-12
DS011878-13
FIGURE 3. Decay Paths for Initial Winding Current During a Change in the Direction of the Winding Current
7
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMD18245T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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
LMD18245T 制造商:Texas Instruments 功能描述:HALF BRIDGE 3A 55V 18245 TO22015
LMD18245T/HALF 制造商:Texas Instruments 功能描述:HALF BRIDGE 3A 55V 18245 TO22015
LMD18245T/LF15 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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
LMD18245T/NOPB 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 H-Bridge Motor Driver W/ Pwm RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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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