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L298 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L298은 전자 산업 및 응용 분야에서
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부품번호 L298 기능
기능 DUAL FULL-BRIDGE DRIVER
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L298 데이터시트, 핀배열, 회로
® L298
..... 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 15-
lead Multiwatt and PowerSO20 packages. It is a
high voltage, high current dual full-bridge driver de-
signed to accept standardTTL logic levels and drive
inductive loads such as relays, solenoids, DC and
stepping motors. Two enableinputs are provided to
enableor disable the deviceindependentlyof the in-
put signals. The emitters of the lower transistors of
each bridge are connected together and the corre-
sponding external terminal can be used for the con-
BLOCK DIAGRAM
DUAL FULL-BRIDGE DRIVER
Multiw att15
PowerSO20
O RDERING NUMBERS : L298N (Multiwatt Vert.)
L298HN (Multiwatt Horiz.)
L298P (PowerSO20)
nectionof an externalsensing resistor. Anadditional
supply input is provided so that the logic works at a
lower voltage.
Jenuary 2000
1/13




L298 pdf, 반도체, 판매, 대치품
L298
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
T1 (Vi) Source Current Turn-off Delay
T2 (Vi) Source Current Fall Time
T3 (Vi) Source Current Turn-on Delay
T4 (Vi) Source Current Rise Time
T5 (Vi) Sink Current Turn-off Delay
T6 (Vi) Sink Current Fall Time
T7 (Vi) Sink Current Turn-on Delay
T8 (Vi) Sink Current Rise Time
fc (Vi) Commutation Frequency
T1 (Ven) Source Current Turn-off Delay
T2 (Ven) Source Current Fall Time
T3 (Ven) Source Current Turn-on Delay
T4 (Ven) Source Current Rise Time
T5 (Ven) Sink Current Turn-off Delay
T6 (Ven) Sink Current Fall Time
T7 (Ven) Sink Current Turn-on Delay
T8 (Ven) Sink Current Rise Time
Test Conditions
0.5 Vi to 0.9 IL (2); (4)
0.9 IL to 0.1 IL (2); (4)
0.5 Vi to 0.1 IL (2); (4)
0.1 IL to 0.9 IL (2); (4)
0.5 Vi to 0.9 IL (3); (4)
0.9 IL to 0.1 IL (3); (4)
0.5 Vi to 0.9 IL (3); (4)
0.1 IL to 0.9 IL (3); (4)
IL = 2A
0.5 Ven to 0.9 IL (2); (4)
0.9 IL to 0.1 IL (2); (4)
0.5 Ven to 0.1 IL (2); (4)
0.1 IL to 0.9 IL (2); (4)
0.5 Ven to 0.9 IL (3); (4)
0.9 IL to 0.1 IL (3); (4)
0.5 Ven to 0.9 IL (3); (4)
0.1 IL to 0.9 IL (3); (4)
1) 1)Sensing voltage can be –1 V for t 50 µsec; in steady state Vsens min – 0.5 V.
2) See fig. 2.
3) See fig. 4.
4) The load must be a pure resistor.
Min.
Typ .
1.5
0.2
2
0.7
0.7
0.25
1.6
0.2
25
3
1
0.3
0.4
2.2
0.35
0.25
0.1
Max.
40
Unit
µs
µs
µs
µs
µs
µs
µs
µs
KHz
µs
µs
µs
µs
µs
µs
µs
µs
Figure 1 : Typical Saturation Voltage vs. Output
Current.
Figure 2 : Switching Times Test Circuits.
4/13
Note : For INPUT Switching, set EN = H
For ENABLESwitching, set IN = H

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L298 전자부품, 판매, 대치품
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
TheL298integratestwo poweroutputstages(A ; B).
The power output stage is a bridge configuration
and its outputs can drive an inductive load in com-
mon or differenzialmode, dependingon the state of
the inputs. The current that flows through the load
comes out from the bridge at the sense output : an
external resistor (RSA ; RSB.) allows to detect the in-
tensity of this current.
1.2. INPUT STAGE
Each bridge is driven by means of four gates the in-
put of which are In1 ; In2 ; EnA and In3 ; In4 ; EnB.
The In inputs set the bridge state when The En input
is high ; a lowstate of the En inputinhibitsthe bridge.
All the inputs are TTL compatible.
2. SUGGESTIONS
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 ca-
pacitor of the power supply is too far from the IC, a
second smaller one must be foreseen near the
L298.
Each input must be connected to the source of the
driving signals by means of a very short path.
Turn-On and Turn-Off : Before to Turn-ON the Sup-
ply Voltageand beforeto Turnit OFF, the Enablein-
put must be driven to the Low state.
3. APPLICATIONS
Fig 6 shows a bidirectional DC motor control Sche-
matic 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 outputvoltage can be used to control the
current amplitude by chopping the inputs, or to pro-
vide overcurrent protection by switching low the en-
able input.
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 configura-
tion 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 in-
ductive loads are driven and when the inputs of the
IC are chopped; Shottkydiodeswould bepreferred.
7/13

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