Description
The L298 is an integrated monolithic circuit in a 15-lead Multiwatt
and PowerSO20 packages. It is a high voltage, high current twin
full-bridge driver that accepts conventional TTL logic levels and
drives inductive loads such as relays, solenoids, DC, and stepping
motors. There are two enable inputs to enable or disable the device
independently of the input signals.
Features
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)
Applications
- POWER OUTPUT STAGE
The L298 has two power output stages (A ; B). The power output
stage has a bridge arrangement, and depending on the state of the
inputs, its outputs can drive an inductive load in common or
differential mode. The current that travels through the load exits
the bridge at the sense output; an external resistor (RSA ; RSB.)
allows the strength of this current to be detected.
- INPUT STAGE
Each bridge is powered by four gates, the inputs of which are In1;
In2; EnA and In3; In4; EnB. When the En input is high, the In
inputs set the bridge state; when the En input is low, the bridge
is inhibited. The inputs are all TTL compatible.
- SUGGESTIONS
A non-inductive capacitor, typically of 100 nF, must be planned for
between both Vs and Vss, to ground, as close to the GND pin as
practicable. When the power supply's huge capacitor is too far away
from the IC, a second, smaller capacitor near the L298 must be
planned for. The sense resistor, which must not be wire wrapped,
must be grounded at the negative pole of Vs, which must be close to
the GND pin of the I.C.
