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L298N 参数 Datasheet PDF下载

L298N图片预览
型号: L298N
PDF下载: 下载PDF文件 查看货源
内容描述: 双路全桥式驱动器 [DUAL FULL-BRIDGE DRIVER]
分类和应用: 外围驱动器驱动程序和接口接口集成电路局域网
文件页数/大小: 13 页 / 187 K
品牌: STMICROELECTRONICS [ STMICROELECTRONICS ]
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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.
TheL298integratestwo poweroutputstages(A ; B).
The power output stage is a bridge configuration
Turn-On and Turn-Off : Before to Turn-ON the Sup-
and its outputs can drive an inductive load in com-
ply Voltageand beforeto Turnit OFF, the Enablein-
mon or differenzialmode, dependingon the state of
put must be driven to the Low state.
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 Sche-
external resistor (R
SA
; R
SB
.) allows to detect the in-
matic Diagram for which only one bridge is needed.
tensity of this current.
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 in-
must 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 outputvoltage can be used to control the
is high ; a lowstate of the En inputinhibitsthe bridge.
current amplitude by chopping the inputs, or to pro-
All the inputs are TTL compatible.
vide overcurrent protection by switching low the en-
able 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 ca-
pacitor 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 configura-
L298.
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 in-
be groundednear 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; Shottkydiodeswould bepreferred.
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