®
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 independently of the 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-
BLOCK DIAGRAM
Multiwatt15 PowerSO20
ORDERING NUMBERS : L298N (Multiwatt Vert.)
L298HN (Multiwatt Horiz.)
L298P (PowerSO20) nection of an external sensing resistor. An additional supply input is provided so that the logic works at a lower voltage.
Jenuary 2000 1/13
L298
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
V
SS
V
I
,V en
I
O
V sens
P tot
T op
T stg
, T j
Parameter
Power Supply
Logic Supply Voltage
Input and Enable Voltage
Peak Output Current (each Channel)
– Non Repetitive (t = 100
µ s)
–Repetitive (80% on –20% off; t on
= 10ms)
–DC Operation
Sensing Voltage
Total Power Dissipation (T case
= 75
°
C)
Junction Operating Temperature
Storage and Junction Temperature
PIN CONNECTIONS (top view)
Multiwatt15
12
11
10
9
8
7
15
14
13
6
5
4
3
2
1
TAB CONNECTED TO PIN 8 D95IN240A
CURRENT SENSING B
OUTPUT 4
OUTPUT 3
INPUT 4
ENABLE B
INPUT 3
LOGIC SUPPLY VOLTAGE V
SS
GND
INPUT 2
ENABLE A
INPUT 1
SUPPLY VOLTAGE V
S
OUTPUT 2
OUTPUT 1
CURRENT SENSING A
Value
50
7
–0.3 to 7
3
2.5
2
–1 to 2.3
25
–25 to 130
–40 to 150
GND
Sense A
N.C.
Out 1
Out 2
V
S
Input 1
Enable A
Input 2
GND
5
6
7
8
9
10
1
2
3
4
PowerSO20
D95IN239
16
15
14
13
12
11
20
19
18
17
GND
Sense B
N.C.
Out 4
Out 3
Input 4
Enable B
Input 3
VSS
GND
THERMAL DATA
Symbol
R th j-case
R th j-amb
(*) Mounted on aluminum substrate
2/13
Parameter
Thermal Resistance Junction-case Max.
Thermal Resistance Junction-ambient Max.
PowerSO20
–
13 (*)
Multiwatt15
3
35
Unit
°
C/W
°
C/W
V
W
°
C
°
C
A
A
A
Unit
V
V
V
L298
PIN FUNCTIONS (refer to the block diagram)
MW.15
1;15
2;3
4
5;7
6;11
8
9
10; 12
13; 14
–
PowerSO
2;19
4;5
6
7;9
8;14
1,10,11,20
12
13;15
16;17
3;18
Name Function
Sense A; Sense B Between this pin and ground is connected the sense resistor to control the current of the load.
Out 1; Out 2
V
S
Outputs of the Bridge A; the current that flows through the load connected between these two pins is monitored at pin 1.
Supply Voltage for the Power Output Stages.
A non-inductive 100nF capacitor must be connected between this pin and ground.
Input 1; Input 2 TTL Compatible Inputs of the Bridge A.
Enable A; Enable B TTL Compatible Enable Input: the L state disables the bridge A
(enable A) and/or the bridge B (enable B).
GND
VSS
Ground.
Supply Voltage for the Logic Blocks. A100nF capacitor must be connected between this pin and ground.
Input 3; Input 4
Out 3; Out 4
N.C.
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 (V
S
= 42V; V
SS
= 5V, T j
= 25
°
C; unless otherwise specified)
Symbol
V
CEsat (L)
V
V
I
V
I
SS
V
S
SS
S iL
CEsat
Parameter
Supply Voltage (pin 4)
Test Conditions
Operative Condition
Logic Supply Voltage (pin 9)
Quiescent Supply Current (pin 4) V en
= H; I
L
= 0 V i
= L
V i
= H
V en
= L V i
= X
Quiescent Current from V
SS
(pin 9) V en
= H; I
L
= 0 V i
= L
V i
= H
V en
= L V i
= X
Input Low Voltage
(pins 5, 7, 10, 12)
V
I iH iL
Input High Voltage
(pins 5, 7, 10, 12)
Low Voltage Input Current
(pins 5, 7, 10, 12)
I iH
High Voltage Input Current
(pins 5, 7, 10, 12)
V en
= L Enable Low Voltage (pins 6, 11)
V en
= H Enable High Voltage (pins 6, 11)
I en
= L Low Voltage Enable Current
(pins 6, 11)
I en
= H High Voltage Enable Current
(pins 6, 11)
V
CEsat (H)
Source Saturation Voltage
Sink Saturation Voltage
Total Drop
V
V
V i
= L
Vi = H en en
= L
≤
V
SS
= H
≤
V
I
L
= 1A
I
L
= 2A
I
L
= 1A (5)
I
L
= 2A (5)
I
L
= 1A (5)
I
L
= 2A (5)
–0.6V
SS
–0.6V
V sens
Sensing Voltage (pins 1, 15)
Min.
V
IH
+2.5
4.5
Typ.
5
13
50
–0.3
2.3
–0.3
2.3
0.95
0.85
1.80
–1 (1)
24
7
30
30
1.35
2
1.2
1.7
1.7
2.7
1.6
2.3
3.2
4.9
2
4
36
12
6
1.5
Max.
46
7
22
70
VSS
–10
100
1.5
V
SS
–10
100 mA mA mA mA
V
Unit
V
V mA mA
V
V
µ
A
µ
A
V
V
V
V
V
V
V
V
µ
A
µ
A
3/13
L298
ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter
T
1
(V i
) Source Current Turn-off Delay
T
2
(V i
) Source Current Fall Time
T
3
(V i
) Source Current Turn-on Delay
T
4
(V i
) Source Current Rise Time
T
5
(V i
) Sink Current Turn-off Delay
T
6
(V i
) Sink Current Fall Time
T
7
(V i
) Sink Current Turn-on Delay
T
8
(V i
) Sink Current Rise Time fc (V i
) Commutation Frequency
T
1
(V en
) Source Current Turn-off Delay
T
2
(V en
) Source Current Fall Time
T
3
(V en
) Source Current Turn-on Delay
T
4
(V en
) Source Current Rise Time
T
5
(V en
) Sink Current Turn-off Delay
T
6
(V en
) Sink Current Fall Time
T
7
(V en
) Sink Current Turn-on Delay
T
8
(V en
) Sink Current Rise Time
Test Conditions
0.5 V i
to 0.9 I
L
(2); (4)
0.9 I
L
to 0.1 I
L
(2); (4)
0.5 V i
to 0.1 I
L
(2); (4)
0.1 I
L
to 0.9 I
L
(2); (4)
0.5 V i
to 0.9 I
L
(3); (4)
0.9 I
L
to 0.1 I
L
(3); (4)
0.5 V i
to 0.9 I
L
(3); (4)
0.1 I
L
to 0.9 I
L
(3); (4)
I
L
= 2A
0.5 V en
to 0.9 I
L
(2); (4)
0.9 I
L
to 0.1 I
L
(2); (4)
0.5 V en
to 0.1 I
L
(2); (4)
0.1 I
L
to 0.9 I
L
(2); (4)
0.5 V en
to 0.9 I
L
(3); (4)
0.9 I
L
to 0.1 I
L
(3); (4)
0.5 V en
to 0.9 I
L
(3); (4)
0.1 I
L
to 0.9 I
L
(3); (4)
1) 1)Sensing voltage can be –1 V for t
≤
50
µ sec; in steady state V sens
min
≥
– 0.5 V.
2) See fig. 2.
3) See fig. 4.
4) The load must be a pure resistor.
Min.
1
0.3
0.4
2.2
0.35
0.25
0.1
0.7
0.25
1.6
0.2
25
3
Typ.
1.5
0.2
2
0.7
Max.
40 KHz
µ s
µ s
µ s
µ s
µ s
µ s
µ s
µ s
Unit
µ s
µ s
µ s
µ s
µ s
µ s
µ s
µ s
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
4/13
Figure 3 : Source Current Delay Times vs. Input or Enable Switching.
L298
Figure 4 : Switching Times Test Circuits.
Note : For INPUT Switching, set EN = H
For ENABLE Switching, set IN = L
5/13
L298
Figure 5 : Sink Current Delay Times vs. Input 0 V Enable Switching.
Figure 6 : Bidirectional DC Motor Control.
V
V en en
= H
= L
Inputs
C = H ; D = L
C = L ; D = H
C = D
C = X ; D = X
Function
Forward
Reverse
Fast Motor Stop
Free Running
Motor Stop
L = Low H = High X = Don’t care
6/13
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)
1.1. POWER OUTPUT STAGE Each input must be connected to the source of the driving signals by means of a very short path.
The L298 integrates two power output stages (A ; B).
The power output stage is a bridge configuration and its outputs can drive an inductive load in common or differenzial mode, depending on the state of the inputs. The current that flows through the load comes out from the bridge at the sense output : an external resistor (R
SA
; R
SB
.) allows to detect the intensity of this current.
1.2. INPUT STAGE
Each bridge is driven by means of four gates the input of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB.
The In inputs set the bridge state when The En input is high ; a low state of the En input inhibits the bridge.
All the inputs are TTL compatible.
2. SUGGESTIONS
Turn-On and Turn-Off : Before to Turn-ON the Supply Voltage and before to Turn it OFF, the Enable input must be driven to the Low state.
3. APPLICATIONS
Fig 6 shows a bidirectional DC motor control Schematic Diagram for which only one bridge is needed.
The external bridge of diodes D1 to D4 is made by four fast recovery elements (trr
≤
200 nsec) that must be chosen of a VF as low as possible at the worst case of the load current.
The sense output voltage can be used to control the current amplitude by chopping the inputs, or to provide overcurrent protection by switching low the enable input.
A non inductive capacitor, usually of 100 nF, must be foreseen between both Vs and Vss, to ground, as near as possible to GND pin. When the large capacitor of the power supply is too far from the IC, a second smaller one must be foreseen near the
L298.
The brake function (Fast motor stop) requires that the Absolute Maximum Rating of 2 Amps must never be overcome.
When the repetitive peak current needed from the load is higher than 2 Amps, a paralleled configuration can be chosen (See Fig.7).
The sense resistor, not of a wire wound type, must be grounded near the negative pole of Vs that must be near the GND pin of the I.C.
An external bridge of diodes are required when inductive loads are driven and when the inputs of the
IC are chopped ; Shottky diodes would be preferred.
7/13
L298
This solution can drive until 3 Amps In DC operation and until 3.5 Amps of a repetitive peak current.
On Fig 8 it 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.
Figure 8 : Two Phase Bipolar Stepper Motor Circuit.
Fig 10 shows a second two phase bipolar stepper motor control circuit where the current is controlled by the I.C. L6506.
This circuit drives bipolar stepper motors with winding currents up to 2 A. The diodes are fast 2 A types.
R
S1
= R
S2
= 0.5
Ω
D1 to D8 = 2 A Fast diodes
{ V
F
≤
1.2 V @ I = 2 A trr
≤
200 ns
8/13
Figure 9 : Suggested Printed Circuit Board Layout for the Circuit of fig. 8 (1:1 scale).
L298
Figure 10 : Two Phase Bipolar Stepper Motor Control Circuit by Using the Current Controller L6506.
R
R
and R sense
depend from the load current
9/13
L298
DIM.
E
F
G
G1
C
D
A
B
H1
H2
L mm inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
0.49
0.66
1
5
2.65
1.6
0.55
0.019
0.75
0.026
20.2
0.039
0.197
0.104
0.063
1.02
1.27
1.52
0.040
0.050
0.060
17.53
17.78
18.03
0.690
0.700
0.710
19.6
0.772
0.022
0.030
0.795
21.9
22.2
22.5
0.862
0.874
0.886
L7
M
M1
S
L1
L2
L3
L4
21.7
17.65
0.854
0.695
0.870
0.886
0.713
17.25
17.5
17.75
0.679
0.689
0.699
10.3
10.7
10.9
0.406
0.421
0.429
2.65
4.25
4.63
1.9
S1 1.9
Dia1 3.65
22.1
4.55
5.08
22.5
18.1
2.9
4.85
5.53
2.6
2.6
3.85
0.104
0.167
0.182
0.075
0.075
0.144
0.179
0.200
0.114
0.191
0.218
0.102
0.102
0.152
OUTLINE AND
MECHANICAL DATA
Multiwatt15 V
10/13
L
L1
L2
L3
DIM.
A
B mm inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
5
2.65
0.197
0.104
C
E
F
G
0.49
0.66
1.14
1.27
1.6
0.55
0.75
1.4
0.019
0.026
0.045
0.050
0.063
0.022
0.030
0.055
G1 17.57
17.78
17.91
0.692
0.700
0.705
H1
H2
19.6
20.2
0.772
0.795
17.25
20.57
18.03
2.54
17.5
17.75
0.679
0.810
0.710
0.100
0.689
0.699
L4
L5
10.3
10.7
10.9
0.406
0.421
0.429
5.28
0.208
2.38
0.094
L6
L7
S
S1
2.65
1.9
1.9
Dia1 3.65
2.9
2.6
2.6
3.85
0.104
0.075
0.075
0.144
0.114
0.102
0.102
0.152
OUTLINE AND
MECHANICAL DATA
L298
Multiwatt15 H
11/13
L298
DIM.
A a1 a2 mm inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
0.1
a3 b
0
0.4
c 0.23
D (1) 15.8
3.6
0.3
0.004
3.3
0.1
0.53
0.32
16
0.000
0.016
0.009
0.622
0.142
0.012
0.130
0.004
0.021
0.013
0.630
E2
E3
G
H h
D1
E e
9.4
13.9
e3
E1 (1) 10.9
5.8
0
15.5
1.27
11.43
9.8
14.5
0.370
0.547
11.1
0.429
2.9
6.2
0.228
0.1
0.000
15.9
0.610
1.1
0.050
0.450
0.386
0.570
0.437
0.114
0.244
0.004
L
N
S
0.8
1.1
0.031
10˚ (max.)
8˚ (max.)
T 10 0.394
(1) "D and F" do not include mold flash or protrusions.
- Mold flash or protrusions shall not exceed 0.15 mm (0.006").
- Critical dimensions: "E", "G" and "a3"
0.626
0.043
0.043
OUTLINE AND
MECHANICAL DATA
JEDEC MO-166
PowerSO20
N N b
DETAIL A e3
H
D
20
E2
T h x 45
1
11
R e a2 A
DETAIL B lead c
E a1
DETAIL A
E1 a3
DETAIL B
Gage Plane
BOTTOM VIEW
S
0.35
L slug
- C -
SEATING PLANE
G C
(COPLANARITY)
E3
10
D1
PSO20MEC
12/13
L298
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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