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5962-9232501MXA Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # 5962-9232501MXA
Description  3A, 55V H-Bridge
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

5962-9232501MXA Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Switching Time Definitions
01056809
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, GROUND Connection: This pin is the ground return,
and is internally connected to the mounting tab.
Pin 8, CURRENT SENSE Output: This pin provides the
sourcing current sensing output signal, which is typically
377 µA/A.
Pin 9, THERMAL FLAG Output: This pin provides the
thermal warning flag output signal. Pin 9 becomes active-low
at 145˚C (junction temperature). However the chip will not
shut itself down until 170˚C 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
Dir
Brake
Active Output Drivers
H
H
L
Source 1, Sink 2
H
L
L
Sink 1, Source 2
L
X
L
Source 1, Source 2
H
H
H
Source 1, Source 2
H
L
H
Sink 1, Sink 2
L
X
H
NONE
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, 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 LMD18200, the PWM signal drives the direc-
tion input (pin 3) and the PWM input (pin 5) is tied to logic
high.
www.national.com
6


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