LMD18200
3A, 55V H-Bridge
General Description
The LMD18200 is a 3A H-Bridge designed for motion control
applications. The device is built using a multi-technology pro-
cess which combines bipolar and CMOS control circuitry
with DMOS power devices on the same monolithic structure.
Ideal for driving DC and stepper motors; the LMD18200 ac-
commodates peak output currents up to 6A. An innovative
circuit which facilitates low-loss sensing of the output current
has been implemented.
Features
n
Delivers up to 3A continuous output
n
Operates at supply voltages up to 55V
n
Low R
DS
(ON) typically 0.3
per switch
n
TTL and CMOS compatible inputs
n
No "shoot-through" current
n
Thermal warning flag output at 145C
n
Thermal shutdown (outputs off) at 170C
n
Internal clamp diodes
n
Shorted load protection
n
Internal charge pump with external bootstrap capability
Applications
n
DC and stepper motor drives
n
Position and velocity servomechanisms
n
Factory automation robots
n
Numerically controlled machinery
n
Computer printers and plotters
Functional Diagram
DS010568-1
FIGURE 1. Functional Block Diagram of LMD18200
December 1999
LMD18200
3A,
55V
H-Bridge
1999 National Semiconductor Corporation
DS010568
www.national.com
Connection Diagrams and Ordering Information
DS010568-2
11-Lead TO-220 Package
Top View
Order Number LMD18200T
See NS Package TA11B
DS010568-25
24-Lead Dual-in-Line Package
Top View
Order Number LMD18200-2D-QV
5962-9232501VXA
LMD18200-2D/883
5962-9232501MXA
See NS Package DA24B
LMD18200
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2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Total Supply Voltage (V
S
, Pin 6)
60V
Voltage at Pins 3, 4, 5, 8 and 9
12V
Voltage at Bootstrap Pins
(Pins 1 and 11)
V
OUT
+16V
Peak Output Current (200 ms)
6A
Continuous Output Current (Note 2)
3A
Power Dissipation (Note 3)
25W
Power Dissipation (T
A
= 25C, Free Air)
3W
Junction Temperature, T
J(max)
150C
ESD Susceptibility (Note 4)
1500V
Storage Temperature, T
STG
-40C to +150C
Lead Temperature (Soldering, 10 sec.)
300C
Operating Ratings
(Note 1)
Junction Temperature, T
J
-40C to +125C
V
S
Supply Voltage
+12V to +55V
Electrical Characteristics
(Note 5)
The following specifications apply for V
S
= 42V, unless otherwise specified. Boldface limits apply over the entire operating
temperature range, -40C
T
J
+125C, all other limits are for T
A
= T
J
= 25C.
Symbol
Parameter
Conditions
Typ
Limit
Units
R
DS
(ON)
Switch ON Resistance
Output Current = 3A (Note 6)
0.33
0.4/0.6
(max)
R
DS
(ON)
Switch ON Resistance
Output Current = 6A (Note 6)
0.33
0.4/0.6
(max)
V
CLAMP
Clamp Diode Forward Drop
Clamp Current = 3A (Note 6)
1.2
1.5
V (max)
V
IL
Logic Low Input Voltage
Pins 3, 4, 5
-0.1
V (min)
0.8
V (max)
I
IL
Logic Low Input Current
V
IN
= -0.1V, Pins = 3, 4, 5
-10
A (max)
V
IH
Logic High Input Voltage
Pins 3, 4, 5
2
V (min)
12
V (max)
I
IH
Logic High Input Current
V
IN
= 12V, Pins = 3, 4, 5
10
A (max)
Current Sense Output
I
OUT
= 1A (Note 8)
377
325/300
A (min)
425/450
A (max)
Current Sense Linearity
1A
I
OUT
3A (Note 7)
6
9
%
Undervoltage Lockout
Outputs turn OFF
9
V (min)
11
V (max)
T
JW
Warning Flag Temperature
Pin 9
0.8V, I
L
= 2 mA
145
C
V
F
(ON)
Flag Output Saturation Voltage
T
J
= T
JW
, I
L
= 2 mA
0.15
V
I
F
(OFF)
Flag Output Leakage
V
F
= 12V
0.2
10
A (max)
T
JSD
Shutdown Temperature
Outputs Turn OFF
170
C
I
S
Quiescent Supply Current
All Logic Inputs Low
13
25
mA (max)
t
Don
Output Turn-On Delay Time
Sourcing Outputs, I
OUT
= 3A
300
ns
Sinking Outputs, I
OUT
= 3A
300
ns
t
on
Output Turn-On Switching Time
Bootstrap Capacitor = 10 nF
Sourcing Outputs, I
OUT
= 3A
100
ns
Sinking Outputs, I
OUT
= 3A
80
ns
t
Doff
Output Turn-Off Delay Times
Sourcing Outputs, I
OUT
= 3A
200
ns
Sinking Outputs, I
OUT
= 3A
200
ns
t
off
Output Turn-Off Switching Times
Bootstrap Capacitor = 10 nF
Sourcing Outputs, I
OUT
= 3A
75
ns
Sinking Outputs, I
OUT
= 3A
70
ns
t
pw
Minimum Input Pulse Width
Pins 3, 4 and 5
1
s
t
cpr
Charge Pump Rise Time
No Bootstrap Capacitor
20
s
LMD18200
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Electrical Characteristics Notes
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when op-
erating the device beyond its rated operating conditions.
Note 2: See Application Information for details regarding current limiting.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is a function of T
J(max)
,
JA
, and T
A
. The maximum allowable power dis-
sipation at any temperature is P
D(max)
= (T
J(max)
- T
A
)/
JA
, or the number given in the Absolute Ratings, whichever is lower. The typical thermal resistance from junc-
tion to case (
JC
) is 1.0C/W and from junction to ambient (
JA
) is 30C/W. For guaranteed operation T
J(max)
= 125C.
Note 4: Human-body model, 100 pF discharged through a 1.5 k
resistor. Except Bootstrap pins (pins 1 and 11) which are protected to 1000V of ESD.
Note 5: All limits are 100% production tested at 25C. Temperature extreme limits are guaranteed via correlation using accepted SQC (Statistical Quality Control)
methods. All limits are used to calculate AOQL, (Average Outgoing Quality Level).
Note 6: Output currents are pulsed (t
W
<
2 ms, Duty Cycle
<
5%).
Note 7: Regulation is calculated relative to the current sense output value with a 1A load.
Note 8: Selections for tighter tolerance are available. Contact factory.
Typical Performance Characteristics
V
SAT
vs Flag Current
DS010568-16
R
DS
(ON) vs Temperature
DS010568-17
R
DS
(ON) vs
Supply Voltage
DS010568-18
Supply Current vs
Supply Voltage
DS010568-19
Supply Current vs
Frequency (V
S
= 42V)
DS010568-20
Supply Current vs
Temperature (V
S
= 42V)
DS010568-21
Current Sense Output
vs Load Current
DS010568-22
Current Sense
Operating Region
DS010568-23
LMD18200
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Test Circuit
Switching Time Definitions
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.
DS010568-8
DS010568-9
LMD18200
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