ST L298 Service Manual

®

.

OPERATING SUPPLY VOLTAGE UP TO 46 V

.

TOTAL DC CURREN T UP TO 4 A

.

LOW SATURATION VO LTAGE

.

OVERTEMPERATU RE P ROT ECTION

.

LOGICAL "0" INPUT VOLTAGE UP TO 1.5 V
(HIGH NOISE IMMUNITY)

L298

DUAL FULL-BRIDGE DRIVER

DESCRIPTION

The L298 is an integrat ed m onolithic c irc uit in a 15 ­lead Multiwatt and PowerSO20 packages. It is a
high volt age , hig h c urrent dual f ul l-b ri dge driver de­signed to acc ept standard T TL logic lev els and drive
inductive loads such as relays, solenoids, DC and
stepping mot ors. Two enab le inputs are provided to
enable or di sable the d evice indepen dently of th e in­put signals. The emitters of the lower transistors of
each bridge are connected together and the corre­sponding e xte rnal termi nal c an b e us ed f or the co n-

BLOCK DIAGRAM

Multiwatt15

ORDERING NUMBERS :

L298HN (Multiwatt Horiz.)

L298P (PowerSO20)

nection of an external sensing r esistor. An ad ditional
supply in put is p ro vi ded so that the logic wor k s at a
lower voltage.

PowerSO20

L298N (Multiwatt Vert.)

Jenuary 2000

1/13

L298

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

SS

V

I,Ven

I

O

V

sens

P
T

op

T

stg

PIN CONNECTIONS (top view)

Power Supply 50 V

S

Logic Supply Voltage 7 V
Input and Enable Voltage –0.3 to 7 V
Peak Output Current (each Channel)

– Non Repetitive (t = 100µs)
–Repetitive (80% on –20% off; t
–DC Opera tio n

= 10ms)

on

3

2.5
2

Sensing Voltage –1 to 2.3 V
Total Power Dissipation (T

tot

case

= 75°C)

25 W

Juncti on Op era ting Temper at ur e –25 to 130

, TjStorag e and Junctio n Temp er atu re –40 to 150

A
A
A

C

°

C

°

Multiwatt15

TAB CONNECTED TO PIN 8

GND

Sense A

N.C.
Out 1
Out 2

V

S

Input 1

Enable A

Input 2

GND 10

1
2
3
4

PowerSO20

5
6
7
8
9

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

D95IN239

D95IN240A

20
19
18
17
16
15
14
13
12
11

CURRENT SENSING B
OUTPUT 4
OUTPUT 3
INPUT 4
ENABLE B
INPUT 3
LOGIC SUPPLY VOLTAGE V
GND
INPUT 2
ENABLE A
INPUT 1
SUPPLY VOLTAGE V
OUTPUT 2
OUTPUT 1
CURRENT SENSING A

GND
Sense B
N.C.
Out 4
Out 3
Input 4
Enable B
Input 3
VSS
GND

S

SS

THERMAL DATA

Symbol Parameter PowerSO20 Multiwatt15 Unit

R

th j-case

R

th j-amb

(*) Mounted on aluminum s ubst rate

2/13

Thermal Resistance Junction-case Max. – 3
Thermal Resistance Junction-ambient Max. 13 (*) 35

C/W

°

C/W

°

PIN FUNCTIONS (refer t o the block diagram )

MW.15 PowerSO Name Function

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.

2;3 4;5 Out 1; Out 2 Outputs of the Bridge A; the current that flows through the load

connected betw een these two pi ns is mon it or ed at pi n 1.

46 V

S

5;7 7;9 Input 1; Input 2 TTL Compatible Inputs of the Bridge A.

6;11 8;14 Enable A; Enable B TTL Compatible Enable Input: the L state disables the bridge A

8 1,10,11,20 GND Ground.
9 12 VSS Supply Voltage for the Logic Blocks. A100nF capacitor must be

10; 12 13;15 Input 3; Input 4 TTL Compatible Inputs of the Bridge B.
13; 14 16;17 Out 3; Out 4 Outputs of the Bridge B. The current that flows through the load

– 3;18 N.C. Not Connected

Supply Voltage for the Power Output Stages.
A non-inductive 100nF capacitor must be connected between this
pin and grou nd.

(enable A) and/or the bridge B (enable B).

connected between this pin and ground.

connected betw een these two pi ns is mon it or ed at pi n 15.

L298

ELECT RICAL CHARA CTE RISTICS (V

= 42V; VSS = 5V, Tj = 25°C; unless otherwise spec if ie d)

S

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Supply Voltage (pin 4) Operative Condition VIH +2.5 46 V

V

S

V

Logic Supply Voltage (pin 9) 4.5 5 7 V

SS

I

Quiescent Supply Current (pin 4) Ven = H; IL = 0 Vi = L

S

V

= H

i

13
50

22
70

Ven = L Vi = X 4 mA

I

Quiescent Current from VSS (pin 9) Ven = H; IL = 0 Vi = L

SS

V

= H

i

24

7

36
12

Ven = L Vi = X 6 mA

V

Input Low Voltage

iL

–0.3 1.5 V

(pins 5, 7, 10, 12)
Input High Vol ta ge

V

iH

2.3 VSS V

(pins 5, 7, 10, 12)
Low Voltage Input Current

I

iL

Vi = L –10

(pins 5, 7, 10, 12)
High Voltage Input Current

I

iH

Vi = H ≤ V

–0.6V

SS

30 100

(pins 5, 7, 10, 12)

V

= L Enable Low Voltage (pins 6, 11) –0.3 1.5 V

en

= H Enable High Voltage (pins 6, 11) 2.3 V

V

en

Ien = L Low Voltage Enable Current

Ven = L –10

SS

(pins 6, 11)

= H High Voltage Enable Current

I

en

= H ≤ VSS –0.6V

V

en

30 100

(pins 6, 11)

V

CEsat (H)

V

CEsat (L )

V

CEsat

V

sens

Source Saturation Voltage IL = 1A

= 2A

I

L

Sink Saturation Voltage IL = 1A (5)

= 2A (5)

I

L

Total Drop IL = 1A (5)

= 2A (5)

I

L

Sensing Voltage (pins 1, 15) –1 (1) 2 V

0.95 1.35
2

0.85 1.2

1.7

1.7

2.7

1.6

2.3

1.80 3.2

4.9

mA
mA

mA
mA

µ

µ

V

µ

µ

V
V

V
V

V
V

A

A

A

A

3/13

L298

ELECT RICAL CHARA CTE RISTICS (continued)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

T

(Vi) Source Current Turn-off Delay 0.5 Vi to 0.9 IL (2); (4) 1.5

1

(Vi) Source Current Fall Time 0.9 IL to 0.1 IL (2); (4) 0.2

T

2

(Vi) Source Current Turn-on Delay 0.5 Vi to 0.1 IL (2); (4) 2

T

3

(Vi) Source Current Rise Time 0.1 IL to 0.9 IL (2); (4) 0.7

T

4

(Vi) Sink Current Turn-off Delay 0.5 Vi to 0.9 IL (3); (4) 0.7

T

5

(Vi) Sink Current Fall Time 0.9 IL to 0.1 IL (3); (4) 0.25

T

6

(Vi) Sink Current Turn-on Delay 0.5 Vi to 0.9 IL (3); (4) 1.6

T

7

(Vi) Sink Current Rise Time 0.1 IL to 0.9 IL (3); (4) 0.2

T

8

) Commutation Fre qu enc y IL = 2A 25 40 KHz

fc (V

i

T

(Ven) Source Current Turn-off Delay 0.5 Ven to 0.9 IL (2); (4) 3

1

(Ven) Source Current Fall Time 0.9 IL to 0.1 IL (2); (4) 1

T

2

(Ven) Source Current Turn-on Delay 0.5 Ven to 0.1 IL (2); (4) 0.3

T

3

(Ven) Source Current Rise Time 0.1 IL to 0.9 IL (2); (4) 0.4

T

4

(Ven) Sink Current Turn-off Delay 0.5 Ven to 0.9 IL (3); (4) 2.2

T

5

(Ven) Sink Current Fall Time 0.9 IL to 0.1 IL (3); (4) 0.35

T

6

(Ven) Sink Current Turn-on Delay 0.5 Ven to 0.9 IL (3); (4) 0.25

T

7

(Ven) Sink Current Rise Time 0.1 IL to 0.9 IL (3); (4) 0.1

T

8

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

1) 1)Sensing voltage c an be – 1 V for t ≤ 50 µsec; in stead y state V

2) See fig. 2.

3) See fig. 4.

4) The load must be a pure resistor.

Figure 1 : Typical Sat ur ation Voltage vs . O utput
Current.

min ≥ – 0.5 V.

sens

Figure 2 : Switchin g Tim es T es t Cir c uit s .

4/13

Note :

For INPUT Switching, set EN = H
For ENABLE Switching, set IN = H