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LMD18200 Datasheet(PDF) 9 Page - Texas Instruments

Part # LMD18200
Description  3A, 55V H-Bridge
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LMD18200 Datasheet(HTML) 9 Page - Texas Instruments

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LMD18200
www.ti.com
SNVS091F – DECEMBER 1999 – REVISED APRIL 2013
APPLICATION INFORMATION
TYPES OF PWM SIGNALS
The LMD18200 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, variable duty-cycle signal in which is encoded both
direction and amplitude information (see Figure 11). 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 LMD18200, the PWM
signal drives the direction input (pin 3) and the PWM input (pin 5) is tied to logic high.
Figure 11. Locked Anti-Phase PWM Control
Sign/magnitude PWM consists of separate direction (sign) and amplitude (magnitude) signals (see Figure 12).
The (absolute) magnitude signal is duty-cycle modulated, and the absence of a pulse signal (a continuous logic
low level) represents zero drive. Current delivered to the load is proportional to pulse width. For the LMD18200,
the DIRECTION input (pin 3) is driven by the sign signal and the PWM input (pin 5) is driven by the magnitude
signal.
Figure 12. Sign/Magnitude PWM Control
SIGNAL TRANSITION REQUIREMENTS
To ensure proper internal logic performance, it is good practice to avoid aligning the falling and rising edges of
input signals. A delay of at least 1 µsec should be incorporated between transitions of the Direction, Brake,
and/or PWM input signals. A conservative approach is be sure there is at least 500ns delay between the end of
the first transition and the beginning of the second transition. See Figure 13.
Copyright © 1999–2013, Texas Instruments Incorporated
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