LMD18200_13 Datasheet, PDF (8/19 Pages) Texas Instruments – LMD18200 3A, 55V H-Bridge

LMD18200
SNVS091E – MAY 2004 – REVISED FEBRUARY 2011
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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 Logic Truth Table. This input controls the direction of current flow between
OUTPUT 1 and OUTPUT 2 (pins 2 and 10) and, therefore, the direction of rotation of a motor load.
Pin 4, BRAKE Input: See Logic Truth Table. 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 Logic Truth Table. How this input (and DIRECTION 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.
PWM
Dir
H
H
H
L
L
X
H
H
H
L
L
X
Logic Truth Table
Brake
L
Source 1, Sink 2
L
Sink 1, Source 2
L
Source 1, Source 2
H
Source 1, Source 2
H
Sink 1, Sink 2
H
NONE
Active Output Drivers
8
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