L298
DUAL FULL-BRIDGE DRIVER
..
..
.
OPERATING SUPPLY VOLTAGE UP TO 46 V
TOTAL DC CURRENT UP TO 4 A
LOW SATURATION VOLTAGE
OVERTEMPERATURE PROTECTION
LOGICAL 0 INPUT VOLTAGE UP TO 1.5 V
(HIGH NOISE IMMUNITY)
DESCRIPTION
The L298 is an integrated monolithic circuit in a 15lead Multiwatt and PowerSO20 packages. It is a
high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels and drive
inductive loads such as relays, solenoids, DC and
stepping motors. Two enable inputs are provided to
enable or disable the device independentlyofthe input signals. The emitters of the lower transistors of
each bridge are connected together and the corresponding external terminal can be used for the con-
Multiwatt15
Po werSO20
ORDERING NUMBERS : L298N (Multiwatt Vert.)
L298HN (Multiwatt Horiz.)
L298P (PowerSO 20)
nection of an external sensing resistor. An additional
supply input is provided so that the logic works at a
lower voltage.
BLOCK DIAGRAM
May 1995
1/12
L298
ABSOLUTE MAXIMUM RATINGS
Symb ol
Value
Unit
VS
Power Supply
50
VSS
Logic Supply Voltage
0.3 to 7
3
2.5
2
A
A
A
VI,Ven
IO
Vsens
Ptot
Tstg, Tj
Parameter
Input and Enable Voltage
Peak Output Current (each Channel)
Non Repetitive (t = 100s)
Repetitive (80% on 20% off; ton = 10ms)
DC Operation
Sensing Voltage
1 to 2.3
25
40 to 150
Total Power Dissipation (Tcase = 75C)
Storage and Junction Temperature
PIN CONNECTIONS (top view)
Multiwatt15
15
CURRENT SENSING B
14
OUTPUT 4
13
OUTPUT 3
12
INPUT 4
11
ENABLE B
10
INPUT 3
LOGIC SUPPLY VOLTAGE V SS
GND
INPUT 1
ENABLE A
INPUT 1
SUPPLY VOLTAGE V S
OUTPUT 2
OUTPUT 1
CURRENT SENSING A
TAB CONNECTED TO PIN 8
D95IN240
GND
20
GND
Sense A
19
Sense B
N.C.
18
N.C.
Out 1
17
Out 4
PowerSO20
Out 2
16
Out 3
VS
15
Input 4
Input 1
14
Enable B
Enable A
13
Input 3
Input 2
12
VSS
10
11
GND
GND
D95IN239
THERMAL DATA
Symb ol
Parameter
Pow erSO20
Multiw att15
Unit
Rth j-case
Thermal Resistance Junction-case
Max.
C/W
Rth j-amb
Thermal Resistance Junction-ambient
Max.
13 (*)
35
C/W
(*) Mounted on aluminum substrate
2/12
L298
PIN FUNCTIONS (refer to the block diagram)
MW .15
Po werSO
Name
1;15
2;19
Sense A; Sense B
Between this pin and ground is connected the sense resistor to
control the current of the load.
Fu nctio n
2;3
4;5
Out 1; Out 2
Outputs of the Bridge A; the current that flows through the load
connected between these two pins is monitored at pin 1.
VS
Supply Voltage for the Power Output Stages.
A non-inductive 100nF capacitor must be connected between this
pin and ground.
5;7
7;9
Input 1; Input 2
6;11
8;14
Enable A; Enable B
TTL Compatible Inputs of the Bridge A.
1,10,11,20
GND
Ground.
12
VSS
Supply Voltage for the Logic Blocks. A100nF capacitor must be
connected between this pin and ground.
10; 12
13;15
Input 3; Input 4
13; 14
16;17
Out 3; Out 4
3;18
N.C.
TTL Compatible Enable Input: the L state disables the bridge A
(enable A) and/or the bridge B (enable B).
TTL Compatible Inputs of the Bridge B.
Outputs of the Bridge B. The current that flows through the load
connected between these two pins is monitored at pin 15.
Not Connected
ELECTRICAL CHARACTERISTICS (VS = 42V; VSS = 5V, Tj = 25C; unless otherwise specified)
Symbol
Parameter
VS
Supply Voltage (pin 4)
VSS
Logic Supply Voltage (pin 9)
IS
ISS
Quiescent Supply Current (pin 4)
T est Con ditio ns
Operative Condition
Min.
4.5
Ven = H; IL = 0
Vi = L
Vi = H
Ven = L
Vi = X
Quiescent Current from VSS (pin 9) Ven = H; IL = 0
Ven = L
T yp.
Max.
Unit
46
13
50
22
70
mA
mA
mA
36
12
mA
mA
mA
VIH +2.5
Vi = L
Vi = H
24
7
Vi = X
ViL
Input Low Voltage
(pins 5, 7, 10, 12)
0.3
1.5
ViH
Input High Voltage
(pins 5, 7, 10, 12)
2.3
VSS
IiL
Low Voltage Input Current
(pins 5, 7, 10, 12)
Vi = L
10
IiH
High Voltage Input Current
(pins 5, 7, 10, 12)
Vi = H VSS 0.6V
100
30
Ven = L
Enable Low Voltage (pins 6, 11)
0.3
1.5
Ven = H
Enable High Voltage (pins 6, 11)
2.3
VSS
Ien = L
Low Voltage Enable Current
(pins 6, 11)
Ven = L
10
Ien = H
High Voltage Enable Current
(pins 6, 11)
Ven = H VSS 0.6V
30
100
1.35
2
1.7
2.7
V
V
1.2
1.7
1.6
2.3
V
V
3.2
4.9
V
V
VCEsat (H) Source Saturation Voltage
IL = 1A
IL = 2A
VCEsat (L) Sink Saturation Voltage
IL = 1A
IL = 2A
(5)
(5)
IL = 1A
IL = 2A
(5)
(5)
VCEsat
Total Drop
Vsens
Sensing Voltage (pins 1, 15)
1 (1)
3/12
L298
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
T est Con ditio ns
Min.
T yp.
Max.
Unit
T1 (Vi)
Source Current Turn-off Delay
0.5 Vi to 0.9 IL
(2); (4)
1.5
T2 (Vi)
Source Current Fall Time
0.9 IL to 0.1 IL
(2); (4)
0.2
T3 (Vi)
Source Current Turn-on Delay
0.5 Vi to 0.1 IL
(2); (4)
T4 (Vi)
Source Current Rise Time
0.1 IL to 0.9 IL
(2); (4)
0.7
T5 (Vi)
Sink Current Turn-off Delay
0.5 Vi to 0.9 IL
(3); (4)
0.7
T6 (Vi)
Sink Current Fall Time
0.9 IL to 0.1 IL
(3); (4)
0.25
T7 (Vi)
Sink Current Turn-on Delay
0.5 Vi to 0.9 IL
(3); (4)
1.6
T8 (Vi)
Sink Current Rise Time
0.1 IL to 0.9 IL
(3); (4)
0.2
fc (Vi)
Commutation Frequency
IL = 2A
T1 (Ven)
Source Current Turn-off Delay
0.5 Ven to 0.9 IL
25
T2 (Ven)
Source Current Fall Time
0.9 IL to 0.1 IL
T3 (Ven)
Source Current Turn-on Delay
0.5 Ven to 0.1 IL
T4 (Ven)
Source Current Rise Time
0.1 IL to 0.9 IL
T5 (Ven)
Sink Current Turn-off Delay
0.5 Ven to 0.9 IL
(2); (4)
(2); (4)
(2); (4)
(2); (4)
T6 (Ven)
Sink Current Fall Time
0.9 IL to 0.1 IL
T7 (Ven)
Sink Current Turn-on Delay
0.5 Ven to 0.9 IL
T8 (Ven)
Sink Current Rise Time
0.1 IL to 0.9 IL
fc (Ven)
Commutation Frequency
IL = 2A
(3); (4)
(3); (4)
(3); (4)
(3); (4)
s
40
0.3
0.4
2.2
0.35
0.25
0.1
KHz
1) 1)Sensing voltage can be 1 V for t 50 sec; in steady state Vsens min 0.5 V.
2) See fig. 2.
3) See fig. 4.
4) The load must be a pure resistor.
5) PIN 1 and PIN 15 connected to GND.
Figure 1 : Typical Saturation Voltage vs. Output
Current.
Figure 2 : Switching Times Test Circuits.
Note : For INPUT Switching, set EN = H
For ENABLE Switching, set IN = H
4/12
KHz
L298
Figure 3 : Source Current Delay Times vs. Input or Enable Switching.
Figure 4 : Switching Times Test Circuits.
Note : For INPUT Switching, set EN = H
For ENABLE Switching, set IN = L
5/12
L298
Figure 5 : Sink Current Delay Times vs. Input 0 V Enable Switching.
Figure 6 : Bidirectional DC Motor Control.
Inp uts
Ven = H
Ven = L
L = Low
6/12
Functio n
C =H ;D =L
Turn Right
C =H ;D =H
Turn Left
C =D
Fast Motor Stop
C =X ;D = C
Free Running
Motor Stop
H = High
X = Dont care
L298
Figure 7 : For higher currents, outputs can be paralleled. Take care to parallel channel 1 with channel 4
and channel 2 with channel 3.
APPLICATION INFORMATION (Refer to the block diagram)
Each input must be connected to the source of the
1.1. POWER OUTPUT STAGE
driving signals by means of a very short path.
TheL298integratestwo power outputstages(A ; B).
Turn-On and Turn-Off : Before to Turn-ON the SupThe power output stage is a bridge configuration
ply Voltageand before to Turn it OFF, the Enable inand its outputs can drive an inductive load in comput must be driven to the Low state.
mon or differenzial mode, dependingon the state of
the inputs. The current that flows through the load
3. APPLICATIONS
comes out from the bridge at the sense output : an
Fig 6 shows a bidirectional DC motor control Scheexternal resistor (RSA ; RSB.) allows to detect the intensity of this current.
matic Diagram for which only one bridge is needed.
The external bridge of diodes D1 to D4 is made by
1.2. INPUT STAGE
four fast recovery elements (trr 200 nsec) that
Each bridge is driven by means of four gates the inmust be chosen of a VF as low as possible at the
put of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB.
worst case of the load current.
The In inputs set the bridge state when The En input
The sense output voltage can be used to control the
is high ; a low state of the En input inhibits the bridge.
current amplitude by chopping the inputs, or to proAll the inputs are TTL compatible.
vide overcurrent protection by switching low the enable input.
2. SUGGESTIONS
The brake function (Fast motor stop) requires that
A non inductive capacitor, usually of 100 nF, must
the Absolute Maximum Rating of 2 Amps must
be foreseen between both Vs and Vss, to ground,
never be overcome.
as near as possible to GND pin. When the large capacitor of the power supply is too far from the IC, a
When the repetitive peak current needed from the
second smaller one must be foreseen near the
load is higher than 2 Amps, a paralleled configuraL298.
tion can be chosen (See Fig.7).
The sense resistor, not of a wire wound type, must
An external bridge of diodes are required when inbe grounded near the negative pole of Vs that must
ductive loads are driven and when the inputs of the
be near the GND pin of the I.C.
IC are chopped; Shottky diodes would be preferred.
7/12
L298
This solution can drive until 3 Amps In DC operation
and until 3.5 Amps of a repetitive peak current.
On Fig 8it is shown the driving of a two phase bipolar
stepper motor ; the needed signals to drive the inputs of the L298 are generated, in this example,
from the IC L297.
Fig 9 shows an example of P.C.B. designed for the
application of Fig 8.
Fig 10 shows a second two phase bipolar stepper
motor control circuit where the current is controlled
by the I.C. L6506.
Figure 8 : Two Phase Bipolar Stepper Motor Circuit.
This circuit drives bipolar stepper motors with winding currents up to 2 A. The diodes are fast 2 A types.
RS1 = R S2 = 0.5
D1 to D8 = 2 A Fast diodes
8/12
VF 1.2 V @ I = 2 A
trr 200 ns
L298
Figure 9 : Suggested Printed Circuit Board Layout for the Circuit of fig. 8 (1:1 scale).
Figure 10 : Two Phase Bipolar Stepper Motor Control Circuit by Using the Current Controller L6506.
RR and Rsense depend from the load current
9/12
L298
MULTIWATT15 (VERTICAL) PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
MIN.
TYP.
MAX.
0.197
2.65
0.104
1.6
0.063
0.039
0.49
0.55
0.019
0.022
0.66
0.75
0.026
0.030
1.14
1.27
1.4
0.045
0.050
0.055
G1
17.57
17.78
17.91
0.692
0.700
0.705
H1
19.6
0.772
H2
L
10/12
inch
MAX.
20.2
0.795
22.1
22.6
0.870
0.890
L1
22
22.5
0.866
0.886
L2
17.65
18.1
0.695
0.713
L3
17.25
17.5
17.75
0.679
0.689
0.699
L4
10.3
10.7
10.9
0.406
0.421
0.429
L7
2.65
2.9
0.104
4.2
4.3
4.6
0.165
0.169
M1
4.5
5.08
5.3
0.177
0.200
1.9
2.6
0.075
0.102
S1
1.9
2.6
0.075
0.102
Dia1
3.65
3.85
0.144
0.152
0.114
0.181
0.209
L298
PowerSO20 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
inch
TYP.
MAX.
MIN.
TYP.
MAX.
3.60
a1
0.10
0.1417
0.30
a2
0.0039
0.0118
3.30
0.1299
a3
0.10
0.0039
0.40
0.53
0.0157
0.0209
0.23
0.32
0.009
0.0126
D (1)
15.80
16.00
0.6220
0.6299
13.90
14.50
0.5472
0.570
1.27
0.050
e3
11.43
0.450
E1 (1)
10.90
11.10
E2
0.4291
0.437
2.90
0.1141
0.10
0.0039
0.0314
0.0433
1.10
0.80
1.10
10 (max.)
8 (max.)
10.0
0.3937
(1) D and E1 do not include mold flash or protrusions
- Mold flash or protrusions shall not exceed 0.15mm (0.006)
N
a2
b
DETAIL A
c
a1
DETAIL B
e3
D
DETAIL A
lead
20
11
slug
a3
DETAIL B
E2
E1
0.35
Gage Plane
- C-
SEATING PLANE
G
(COPLANARITY)
10
PSO20MEC
h x 45
11/12
L298
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.
1995 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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12/12
