- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384603 > LMD18201T (NATIONAL SEMICONDUCTOR CORP) 3A, 55V H-Bridge PDF資料下載
參數(shù)資料
| 型號： | LMD18201T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | 3A, 55V H-Bridge |
| 中文描述： | 6 A HB BASED PRPHL DRVR WITH PWM, PZFM11 |
| 封裝： | TO-220, 11 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LMD18201T |
Pinout Description
(See Connection Diagram)
Pin 1, BOOTSTRAP 1 Input:
Bootstrap capacitor pin for half
H-Bridge number 1. The recommended capacitor (10 nF) is
connected between pins 1 and 2.
Pin 2, OUTPUT 1:
Half H-Bridge number 1 output.
Pin 3, DIRECTION Input:
See Table 1 This input controls
the direction of current flow between OUTPUT 1 and OUT-
PUT 2 (pins 2 and 10) and, therefore, the direction of rotation
of a motor load.
Pin 4, BRAKE Input:
See Table 1 This input is used to
brake a motor by effectively shorting its terminals. When
braking is desired, this input is taken to a logic high level and
it is also necessary to apply logic high to PWM input, pin 5.
The drivers that short the motor are determined by the logic
level at the DIRECTION input (Pin 3): with Pin 3 logic high,
both current sourcing output transistors are ON; with Pin 3
logic low, both current sinking output transistors are ON. All
output transistors can be turned OFF by applying a logic high
to Pin 4 and a logic low to PWM input Pin 5; in this case only
a small bias current (approximately 1.5 mA) exists at each
output pin.
Pin 5, PWM Input:
See Table 1 How this input (and DIREC-
TION input, Pin 3) is used is determined by the format of the
PWM Signal.
Pin 6, V
S
Power Supply
Pin 7, POWER GROUND/SENSE Connection:
This pin is
the ground return for the power DMOS transistors of the
H-Bridge. The current through the H-Bridge can be sensed
by adding a small, 0.1
, sense resistor from this pin to the
power supply ground.
Pin 8, SIGNAL GROUND:
This is the ground return for the
internal logic circuitry used to control the PWM switching of
the H-Bridge.
Pin 9, THERMAL FLAG Output:
This pin provides the ther-
mal warning flag output signal. Pin 9 becomes active-low at
145C (junction temperature). However the chip will not shut
itself down until 170C is reached at the junction.
Pin 10, OUTPUT 2:
Half H-Bridge number 2 output.
Pin 11, BOOTSTRAP 2 Input:
Bootstrap capacitor pin for
half H-Bridge number 2. The recommended capacitor
(10 nF) is connected between pins 10 and 11.
TABLE 1. Logic Truth Table
PWM
H
H
L
H
H
L
Dir
H
L
X
H
L
X
Brake
L
L
L
H
H
H
Active Output Drivers
Source 1, Sink 2
Sink 1, Source 2
Source 1, Source 2
Source 1, Source 2
Sink 1, Sink 2
NONE
Application Information
TYPES OF PWM SIGNALS
The LMD18201 readily interfaces with different forms of
PWM signals. Use of the part with two of the more popular
forms of PWM is described in the following paragraphs.
Simple, locked anti-phase PWM
consists of a single, vari-
able duty-cycle signal in which is encoded both direction and
amplitude information (see Figure 2). A 50% duty-cycle
PWM signal represents zero drive, since the net value of
voltage (integrated over one period) delivered to the load is
zero. For the LMD18201, the PWM signal drives the direc-
tion input (pin 3) and the PWM input (pin 5) is tied to logic
high.
Sign/magnitude PWM
consists of separate direction (sign)
and amplitude (magnitude) signals (see Figure 3). The (ab-
solute) magnitude signal is duty-cycle modulated, and the
absence of a pulse signal (a continuous logic low level) rep-
resents zero drive. Current delivered to the load is propor-
tional to pulse width. For the LMD18201, the DIRECTION in-
put (pin 3) is driven by the sign signal and the PWM input
(pin 5) is driven by the magnitude signal.
USING THE THERMAL WARNING FLAG
The THERMALFLAG output (pin 9) is an open collector tran-
sistor. This permits a wired OR connection of thermal warn-
ing flag outputs from multiple LMD18201’s, and allows the
user to set the logic high level of the output signal swing to
match system requirements. This output typically drives the
interrupt input of a system controller. The interrupt service
routine would then be designed to take appropriate steps,
such as reducing load currents or initiating an orderly system
shutdown. The maximum voltage compliance on the flag pin
is 12V.
SUPPLY BYPASSING
During switching transitions the levels of fast current
changes experienced may cause troublesome voltage tran-
sients across system stray inductances.
It is normally necessary to bypass the supply rail with a high
quality capacitor(s) connected as close as possible to the V
S
Power Supply (Pin 6) and POWER GROUND (Pin 7). A 1 μF
high-frequency ceramic capacitor is recommended. Care
should be taken to limit the transients on the supply pin be-
low the Absolute Maximum Rating of the device. When oper-
ating the chip at supply voltages above 40V a voltage sup-
pressor (transorb) such as P6KE62A is recommended from
DS010793-4
FIGURE 2. Locked Anti-Phase PWM Control
DS010793-5
FIGURE 3. Sign/Magnitude PWM Control
www.national.com
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMD18245 | 3A, 55V DMOS Full-Bridge Motor Driver |
| LMD18245T | 3A, 55V DMOS Full-Bridge Motor Driver |
| LMD18400 | Quad High Side Driver |
| LMD18400N | Quad High Side Driver |
| LMH1251 | YPBPR to RGB Decoder and 2:1 Video Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMD18201T | 制造商:Texas Instruments 功能描述:HALF BRIDGE 3A 55V 18201 SIL-11 |
| LMD18201T/NOPB | 功能描述:馬達/運動/點火控制器和驅(qū)動器 3A 55V H-Bridge 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 |
| LMD18201T/NOPB | 制造商:Texas Instruments 功能描述:Motor Controller ICs |
| LMD18245 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3A, 55V DMOS Full-Bridge Motor Driver |
| LMD18245_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3A, 55V DMOS Full-Bridge Motor Driver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。