L6228 STMicroelectronics, L6228 Datasheet - Page 17

• Manufacturer Part Number: L6228
• Description: DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
• Manufacturer: STMicroelectronics

Figure 20 shows the Overcurrent Detection operation. The Disable Time t
ation can be easily programmed by means of the accurate thresholds of the logic inputs. It is affected whether by
C
bridge when an overcurrent has been detected depends only by C
C
should be chosen as big as possible according to the maximum tolerable Delay Time and the R
be chosen according to the desired Disable Time.
The resistor R
are respectively 100K
Figure 20. Overcurrent Protection Waveforms
EN
EN
and R
is also used for providing immunity to pin EN against fast transient noises. Therefore the value of C
EN
values and its magnitude is reported in Figure 21. The Delay Time t
EN
BRIDGE
V
V
I
SOVER
OCD
th(OFF)
V
th(ON)
should be chosen in the range from 2.2K to 180K . Recommended values for R
OFF
OFF
I
EN
V
OUT
ON
ON
DD
t
and 5.6nF that allow obtaining 200 s Disable Time.
OCD(ON)
t
EN(FALL)
t
DELAY
t
D(OFF)EN
t
OCD(OFF)
EN
V
EN(LOW)
t
t
value. Its magnitude is reported in Figure 22.
EN(RISE)
DISABLE
DISABLE
before recovering normal oper-
t
D(ON)EN
DELAY
D02IN1400
before turning off the
EN
value should
EN
and C
L6228
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EN
EN