TH8065KDCAA MELEXIS [Melexis Microelectronic Systems], TH8065KDCAA Datasheet - Page 26

• Manufacturer Part Number: TH8065KDCAA
• Description: Voltage Regulator with LIN Transceiver and Watchdog
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

4.
4.1 Safe Operating Area
The maximum power dissipation depends on the thermal resistance of the package and the PCB, the
temperature difference between Junction and Ambient as well as the airflow.
The power dissipation can be calculated with:
The power dissipation of the transmitter P
as well as on the bus voltage V
C
V
cycle on TxD of 50%
The permitted package power dissipation can be calculated:
If we consider that P
T
package. The thermal energy is transferred via the package and the pins to the ambient. This transfer can be
improved with additional ground areas on the PCB as well as ground areas under the IC.
TH8065 – Datasheet
3901008065
J
SUP
L
-T
and the bit rate. Figure 18 shows the dependence of power dissipation of the transmitter as function of
. The conditions for calculation of the power dissipation is R
A
is the temperature difference between junction and ambient and R
P
Application Hints
P
I
V
D
D
CCmax
max
= (V
=
SUP
=
T
R
j
THJ
T
– V
R
−
j
D_TX_max
THJ
50
45
40
35
30
25
20
15
10
T
−
−
5
0
CC
A
A
5
T
−
) * I
A
A
Figure 18 - Power dissipation LIN transceiver @ 20kbit
VSUP
−
= f (V
VCC
6
P
D
+ P
BUS
_
7
−
SUP
TX
VCC
=V
D_TX
_
) the max output current I
max
8
BAT
Voltage Regulator with LIN Transceiver and Watchdog
@
-V
9
VSUP
D_TX
D
, the resulting termination resistance R
10
depends on the transceiver configuration and its parameters
Page 26 of 40
11
V
SUP
12
[V]
13
VCC
on V
L
14
=500Ω, C
CC can
15
th
16
be calculated:
L
=10nF, bit rate=20kbit and duty
is the thermal resistance of the
17
L
, the capacitive bus load
18
TH8065
19
May 2006
Rev 003