L6235 STMicroelectronics, L6235 Datasheet - Page 11

• Manufacturer Part Number: L6235
• Description: DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR
• Manufacturer: STMicroelectronics

Figure 10 shows the lower limit for the On Time t
to be said that t
than t
So, small C
switching frequency), but, the smaller is the value for C
performance.
Figure 9. t
Figure 10. Area where t
RCRISE
OFF
OFF
- t
ON
DT
versus C
value gives more flexibility for the applications (allows smaller On Time and, therefore, higher
. In this last case the device continues to work but the Off Time t
is always bigger than t
OFF
ON
can vary maintaining the PWM regulation.
1 . 10
1 . 10
and R
100
100
10
10
1
1
4
3
0.1
0.1
OFF
ON(MIN)
.
1.5 s (typ. value)
R
off
because the device imposes this condition, but it can be smaller
= 20k
ON
1
1
for having a good PWM current regulation capacity. It has
R
off
Coff [nF]
Coff [nF]
OFF
= 47k
, the more influential will be the noises on the circuit
R
off
= 100k
10
10
100
100
OFF
is not more constant.
L6235
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