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參數(shù)資料
| 型號： | LMD18245 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3A, 55V DMOS Full-Bridge Motor Driver |
| 中文描述： | 第3A，55V的DMOS全橋式電動機驅(qū)動器 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 647K |
| 代理商： | LMD18245 |
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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| LMD18400N | Quad High Side Driver |
| LMH1251 | YPBPR to RGB Decoder and 2:1 Video Switch |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMD18245_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3A, 55V DMOS Full-Bridge Motor Driver |
| LMD18245T | 功能描述:馬達/運動/點火控制器和驅(qū)動器 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 |
| 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/運動/點火控制器和驅(qū)動器 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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