L6208Q STMicroelectronics, L6208Q Datasheet - Page 19

• Manufacturer Part Number: L6208Q
• Description: Dmos Driver For Bipolar Stepper Motor
• Manufacturer: STMicroelectronics

L6208Q
Figure 21. Overcurrent protection simplified schematic
Figure 22
recovering normal operation can be easily programmed by means of the accurate
thresholds of the logic inputs. It is affected whether by C
magnitude is reported in
an overcurrent has been detected depends only by C
Figure
C
the value of C
delay time and the R
The resistor R
values for R
Disable Time.
μC or LOGIC
EN
V
DD
is also used for providing immunity to pin EN against fast transient noises. Therefore
24.
R
C
shows the overcurrent detection operation. The disable time t
EN
EN
EN
.
.
EN
EN
and C
EN
should be chosen as big as possible according to the maximum tolerable
should be chosen in the range from 2.2 kΩ to 180 kΩ. Recommended
EN
EN
40Ω TYP.
R
DS(ON)
value should be chosen according to the desired disable time.
are respectively 100 kΩ and 5.6 nF that allow obtaining 200 µs
Figure
TO GATE
LOGIC
OPEN-DRAIN
Doc ID 018710 Rev 1
INTERNAL
POWER SENSE
23. The delay time t
COMPARATOR
COMPARATOR
1 cell
OCD
OCD
POWER DMOS
OVER TEMPERATURE
n cells
OUT1
DELAY
I
1A
FROM THE
BRIDGE B
EN
/ n
(I
1A
I
A
REF
I
1A
+I
EN
value. Its magnitude is reported in
VS
2A
before turning off the bridge when
+
) / n
and R
A
I
2A
OUT2
I
2A
EN
POWER DMOS
A
/ n
values and its
n cells
HIGH SIDE DMOSs OF
DISABLE
Circuit description
THE BRIDGE A
POWER SENSE
before
1 cell
AM02563v1
19/33