L6208Q STMicroelectronics, L6208Q Datasheet - Page 14

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

Circuit description
14/33
Figure 15
capacity. It has to be said that t
imposes this condition, but it can be smaller than t
continues to work but the off time t
So, small C
therefore, higher switching frequency), but, the smaller is the value for C
influential will be the noises on the circuit performance.
Figure 14. t
shows the lower limit for the on time t
OFF
OFF
value gives more flexibility for the applications (allows smaller on time and,
versus C
1 . 10
1 . 10
100
10
1
4
3
0.1
OFF
⎧
⎪
⎨
⎪
⎩
Doc ID 018710 Rev 1
t
t
ON
ON
ON
and R
is always bigger than t
OFF
>
>
R
t
off
RCRISE
t
t
ON MIN
RCRISE
OFF
is not more constant.
= 20kΩ
(
1
R
)
=
–
off
Coff [nF]
t
600 C
DT
ON
= 47kΩ
for having a good PWM current regulation
⋅
RCRISE
=
R
1.5μs typ
OFF
off
= 100kΩ
10
ON(MIN)
- t
(
DT
)
. In this last case the device
because the device
OFF
100
, the more
L6208Q