L6229DTR STMicroelectronics, L6229DTR Datasheet - Page 11

• Manufacturer Part Number: L6229DTR
• Description: IC DRIVER 3PHASE DC MOTOR 24SOIC
• Manufacturer: STMicroelectronics
• Type: Driverr

Specifications of L6229DTR

• Applications: DC Motor Driver, Brushless (BLDC), 3 Phase
• Number Of Outputs: 1
• Current - Output: 2.8A
• Voltage - Supply: 12 V ~ 52 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Supply Voltage: 8 V to 52 V
• Supply Current: 1.4 A
• Mounting Style: SMD/SMT
• For Use With: 497-5491 - EVAL BOARD FOR L6229PD SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-4008-2

Figure 12 shows the magnitude of the Off Time t
calculated from the equations:
where R
Therefore:
These values allow a sufficient range of t
The capacitor value chosen for C
Rise Time t
monostable is triggered. Therefore, the On Time t
be bigger than t
can not be smaller than the minimum on time t
Figure 13 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 12. t
RCRISE
t
t
20KΩ ≤ R
0.47nF ≤ C
t
t
t
t
RCFALL
OFF
DT
OFF(MIN)
OFF(MAX)
RCRISE
⎧
⎨
⎩
t
t
OFF
O N
ON
= 1µs (typical value)
= t
OFF
RCRISE
>
>
and C
OFF
- t
RCFALL
= 0.6 · R
= 600 · C
t
t
ON
ON MI N
RC R ISE
DT
= 6.6µs
RCRISE
OFF
= 6ms
value gives more flexibility for the applications (allows smaller On Time and, therefore, higher
versus C
OFF
. In this last case the device continues to work but the Off Time t
(
is always bigger than t
OFF
will only be an issue if the capacitor is not completely charged before the next time the
≤ 100KΩ
+ t
≤ 100nF
)
OFF
are the external component values and t
for allowing a good current regulation by the PWM stage. Furthermore, the On Time t
–
OFF
DT
=
t
DT
= 0.6 · R
2.5µs (typ. value)
· C
OFF
1 . 10
1 . 10
OFF
100
10
and R
1
4
3
0.1
OFF
OFF
also affects the Rise Time t
OFF
· C
ON(MIN)
OFF
.
OFF
R
to implement the drive circuit for most motors.
off
ON(MIN)
+ t
because the device imposes this condition, but it can be smaller
= 20kΩ
ON
DT
1
ON
OFF
, which depends by motors and supply parameters, has to
for having a good PWM current regulation capacity. It has
R
off
.
versus C
Coff [nF]
OFF
= 47kΩ
, the more influential will be the noises on the circuit
R
off
OFF
DT
= 100kΩ
10
RCRISE
is the internally generated Dead Time with:
and R
of the voltage at the pin RCOFF. The
OFF
values. It can be approximately
100
OFF
is not more constant.
L6229
11/25
ON