EVAL6229QR STMicroelectronics, EVAL6229QR Datasheet - Page 14

• Manufacturer Part Number: EVAL6229QR
• Description: BOARD DEMO L6229Q BLDC MOT CTRL
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of EVAL6229QR

• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: L6229Q
• Primary Attributes: 3-Ph BLDC, 8 ~ 52V Output, PWM Current Control, Brake Function
• Secondary Attributes: Over Current, Cross Conduction & Temperature Protection
• Maximum Operating Temperature: + 125 C
• Operating Supply Voltage: 8 V to 52 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6229Q
• Other names: 497-10748

Circuit description
14/28
Figure 10. Output current regulation waveforms
Figure 11
approximately calculated from the equations:
where R
Dead Time with:
Therefore:
These values allow a sufficient range of t
The capacitor value chosen for C
pin RCOFF. The rise time t
charged before the next time the monostable is triggered. Therefore, the on time t
depends by motors and supply parameters, has to be bigger than t
good current regulation by the PWM stage. Furthermore, the on time t
than the minimum on time t
R
V
V
SENSE
I
SENSE
OUT
V
REF
2.5V
OFF
V
ON
t
t
20 kΩ ≤ R
0.47 nF ≤ C
t
t
t
5V
REF
RCFALL
OFF
DT
OFF(MIN)
OFF(MAX)
0
RC
OFF
= 1 µs (typical value)
= t
shows the magnitude of the Off Time t
SYNCHRONOUS RECTIFICATION
D02IN1351
RCFALL
and C
= 0.6 · R
= 6.6 µs
OFF
= 6 ms
OFF
OFF
≤ 100 kΩ
+ t
≤ 100 nF
OFF
DT
are the external component values and t
= 0.6 · R
· C
RCRISE
ON(MIN)
OFF
Doc ID 15209 Rev 3
OFF
OFF
will only be an issue if the capacitor is not completely
.
B
also affects the Rise Time t
· C
Slow Decay
t
RCFALL
OFF
OFF
1μs t
t
1μs t
t
RCRISE
OFF
C
to implement the drive circuit for most motors.
+ t
BLANK
DT
OFF
DT
D
versus C
t
ON
A
OFF
B
DT
RCRISE
and R
Slow Decay
is the internally generated
t
RCFALL
RCRISE
1μs t
t
1μs t
t
RCRISE
OFF
ON
C
OFF
of the voltage at the
BLANK
DT
can not be smaller
for allowing a
values. It can be
D
ON
L6229Q
, which