LOGICAL ”0” INPUT VOLTAGE UP TO 1.5 V
(HIGHNOISE IMMUNITY)
L298
DUALFULL-BRIDGE DRIVER
DESCRIPTION
TheL298isan integratedmonolithiccircuitin a 15lead Multiwatt and PowerSO20 packages. It is a
highvoltage,highcurrentdualfull-bridgedriver designedtoacceptstandardTTLlogiclevelsanddrive
inductiveloads such as relays, solenoids, DC and
steppingmotors.Twoenableinputsare providedto
enableordisablethedeviceindependentlyoftheinput signals.The emittersof thelowertransistorsof
each bridgeareconnectedtogetherand the correspondingexternalterminalcan beusedforthecon-
BLOCK DIAGRAM
Multiwatt15
ORDERING NUMBERS : L298N (M ultiwatt Vert.)
L298HN (Mult iwat t H oriz .)
L298P (PowerSO20)
nectionofanexternalsensingresistor.Anadditional
supplyinputis providedso that the logicworksat a
lowervoltage.
PowerSO20
Jenuary 2000
1/13
L298
ABSOLUTEMAXIMUM RATINGS
SymbolParame t erValueUnit
V
V
V
I,Ven
V
P
T
T
stg,Tj
I
sens
Power Supply50V
S
LogicSupply Voltage7V
SS
Inputand Enable Voltage–0.3 to 7V
Peak OutputCurrent (each Channel)
O
– Non Repetitive (t = 100µs)
–Repetitive (80% on –20% off; t
–DC Operation
= 10ms)
on
3
2.5
2
Sensing Voltage–1 to 2.3V
totTotalPower Dissipation (T
JunctionOperating Temperature–25 to 130°
op
case
=75°C)
25W
Storageand JunctionTemperature–40 to 150
A
A
A
C
°C
PIN CONNECTIONS
(top view)
Multiwatt15
TAB CONNECTED TO PIN 8
GND
Sense A
N.C.
Out 1
Out 2
V
S
Input 1
Enable A
Input 2
GND10
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
T5(Vi)Sink Current Turn-offDelay0.5Vito 0.9IL(3);(4)0.7
T6(Vi)Sink Current Fall Time0.9ILto 0.1 IL(3);(4)0.25
T7(Vi)Sink Current Turn-onDelay0.5Vito 0.9IL(3);(4)1.6
T8(Vi)Sink Current Rise Time0.1 ILto 0.9 IL(3);(4)0.2
The power output stage is a bridge configuration
and its outputscan drive an inductiveload in commonor differenzialmode,dependingonthestateof
the inputs. The currentthat flows through the load
comesoutfromthe bridgeat the sense output: an
externalresistor(R
putof whichareIn1; In2 ; EnA and In3; In4 ; EnB.
TheIninputssetthebridgestatewhenTheEninput
ishigh;a lowstateoftheEninputinhibitsthebridge.
Alltheinputsare TTL compatible.
2.SUGGESTIONS
A non inductivecapacitor,usuallyof 100 nF, must
be foreseen between both Vs and Vss, to ground,
asnearaspossible toGNDpin.Whenthe largecapacitorof thepowersupply is too farfrom the IC, a
second smaller one must be foreseen near the
L298.
Thesenseresistor,not of a wirewoundtype, must
begroundednear thenegativepoleofVsthatmust
be nearthe GNDpin of the I.C.
Eachinput must be connectedto the source of the
driving signalsby meansof a veryshortpath.
Turn-OnandTurn-Off:BeforetoTurn-ONtheSupplyVoltageand beforetoTurnitOFF,theEnableinput mustbe drivento the Low state.
maticDiagram forwhichonlyonebridgeisneeded.
Theexternalbridge of diodesD1 to D4 is made by
four fast recovery elements (trr
must be chosen of a VF as low as possibleat the
worstcase of the load current.
Thesenseoutputvoltagecanbeusedtocontrolthe
currentamplitudebychoppingtheinputs,or to provideovercurrentprotectionbyswitchinglow theenableinput.
The brake function (Fast motor stop) requires that
the Absolute Maximum Rating of 2 Amps must
neverbe overcome.
Whenthe repetitivepeak currentneededfrom the
loadis higher than 2 Amps,a paralleledconfigurationcan be chosen(See Fig.7).
An externalbridge of diodes are requiredwhen inductiveloadsare drivenandwhenthe inputsof the
ICarechopped;Shottkydiodeswouldbepreferred.
≤ 200 nsec) that
7/13
L298
Thissolutioncandriveuntil3 AmpsInDCoperation
anduntil3.5Amps of a repetitivepeakcurrent.
OnFig8itisshownthedrivingofa twophasebipolar
Fig 10 shows a secondtwo phasebipolar stepper
motorcontrolcircuit where the currentis controlled
bythe I.C.L6506.
steppermotor; the needed signalsto drive the inputs of the L298 are generated,in this example,
fromtheIC L297.
(1) ”D andF” donot include moldflash or protrusions.
- Moldflash orprotrusions shall not exceed0.15 mm (0.006”).
- Criticaldimensions: ”E”, ”G” and ”a3”
OUTLINE AND
MECHANICAL DATA
JEDEC MO-166
PowerSO20
E2
hx
45
DETAIL B
BOTTOM VIEW
R
a3
Gage Plane
lead
E
DETAIL B
0.35
S
D1
a1
L
c
DETAIL A
slug
-C-
SEATING PLANE
GC
(COPLANARITY)
E3
NN
a2
A
b
DETAIL A
e3
H
D
T
1
e
1120
E1
10
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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13/13
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