EVAL6229PD STMicroelectronics, EVAL6229PD Datasheet - Page 14

• Manufacturer Part Number: EVAL6229PD
• Description: EVAL BOARD FOR L6229PD SOIC
• Manufacturer: STMicroelectronics

Specifications of EVAL6229PD

• Mfg Application Notes: L6235, AN1625 App Note
• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: L6229PD SOIC
• Primary Attributes: 3-Ph BLDC, 8 ~ 52V Output, PWM Current Control, Brake Function
• Secondary Attributes: Over Current, Cross Conduction & Temperature Protection
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5491

AN1451 APPLICATION NOTE
Figure 13. Output Current Regulation Waveforms
Figure 14 shows the magnitude of the Off Time t
culated from the equations:
where R
Therefore:
These values allow a sufficient range of t
The capacitor value chosen for C
The Rise Time t
monostable is triggered. Therefore, the on time t
be bigger than t
14/43
R
V
V
SENSE
I
SENSE
OUT
V
REF
2.5V
OFF
V
ON
5V
t
t
20K
0.47nF
t
t
t
REF
0
RC
RCFALL
OFF
DT
OFF(MIN)
OFF(MAX)
OFF
= 1µs (typical value)
= t
SYNCHRONOUS OR QUASI
SYNCHRONOUS RECTIFICATION
and C
D01IN1334
RCFALL
= 0.6 · R
R
= 6.6µs
C
RCRISE
OFF
= 6ms
RCRISE
OFF
OFF
+ t
100K
OFF
are the external component values and t
for allowing a good current regulation by the PWM stage. Furthermore, the on time t
100nF
will only be an issue if the capacitor is not completely charged before the next time the
DT
= 0.6 · R
· C
OFF
OFF
OFF
also affects the Rise Time t
· C
OFF
OFF
B
to implement the drive circuit for most motors.
Slow Decay
+ t
OFF
t
RCFALL
ON
DT
1 s t
1 s t
t
t
RCRISE
OFF
versus C
, which depends by motors and supply parameters, has to
C
BLANK
DT
OFF
D
DT
RCRISE
and R
is the internally generated Dead Time with:
t
ON
A
OFF
of the voltage at the pin RC
B
values. It can be approximately cal-
Slow Decay
t
RCFALL
1 s t
1 s t
t
t
RCRISE
OFF
C
BLANK
DT
D
A
(or RC
ON
B
).