ATA6823-DK Atmel, ATA6823-DK Datasheet - Page 13

• Manufacturer Part Number: ATA6823-DK
• Description: BOARD EVALUATION FOR ATA6823
• Manufacturer: Atmel
• Type: PWM Controllersr

Specifications of ATA6823-DK

• Main Purpose: Power Management, Motor Control
• Embedded: No
• Utilized Ic / Part: ATA6823
• Primary Attributes: Brush DC Motors, 8 ~ 18V, LIN Interface, Watchdog, 5V Regulator
• Secondary Attributes: Cross Conduction, Under/Over Voltage, Short Circuit, & Temperature Protection
• Input Voltage: 8 V to 18 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: ATA6823

3.11.1
4856K–AUTO–01/11
Cross Conduction Time
To prevent high peak currents in the H-bridge, a non-overlapping phase for switching the
external power NMOS is realized. An external RC combination defines the cross conduction
time in the following way:
t
The RC combination is charged to 5V and the switching level of the internal comparator is
67% of the start level.
The resistor R
C
The time measurement is triggered by the PWM or DIR signal crossing the 50% level.
Figure 3-6.
The delays t
CC
PWM or
DIR
Lx
Hx
CC
(µs) = 0.41
value has to be 5nF. Use of COG capacitor material is recommended.
HxLH
CC
Timing of the Drivers
and t
R
must be greater than 5k and should be as close as possible to 10k , the
CC
t
(k )
LxHL
LxLH
t
CC
t
HxLH
include the cross conduction time t
t
Lxf
C
CC
50%
(nF) (tolerance: ±5% ±0.15µs)
t
Hxr
80%
20%
80%
20%
t
t
CC
HxHL
t
LxLH
t
Hxf
CC
.
Atmel ATA6823
t
Lxr
t
t
t
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