tda8358j-n2 NXP Semiconductors, tda8358j-n2 Datasheet - Page 14

• Manufacturer Part Number: tda8358j-n2
• Description: Full Bridge Vertical Deflection Output Circuit In Lvdmos With East-west Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Equivalent thermal resistance network
The TDA8358J has two independent power dissipating
systems, the vertical output circuit and the east-west
circuit.
It is recommended to verify the individual maximum (peak)
junction temperatures of both circuits. Therefore the
maximum (peak) power dissipations of the circuits and
also the heatsink temperature should be measured. The
maximum (peak) junction temperatures can be calculated
by using an equivalent thermal network (see Fig.6).
The network only includes the contribution of the
maximum (peak) power dissipation P
dissipation of the most critical transistor internally
connected to pins OUTA and VGND. The model assumes
equivalent maximum (peak) power dissipations during the
different vertical scan stages for all the functionally paired
transistors. The calculated maximum (peak) junction
temperatures should not exceed T
2002 Sep 25
handbook, halfpage
Full bridge vertical deflection output circuit
in LVDMOS with east-west amplifier
Fig.6 Equivalent thermal resistance network.
R th(EW-P1)
10.5 K/W
P EW
T EW(M)
T P1(M)
T c
R th(P1-c)
2.2 K/W
P tot
T TRv(M)
j
= 150 C.
MGL872
TRv(peak)
R th(TRv-P1)
P TRv(M)
5.2 K/W
, being the
14
E
Measured or known values:
The IC total power dissipation is:
P
It should be noted that the allowed IC total power
dissipation is P
The maximum (peak) temperature T
The maximum (peak) junction temperatures for the output
circuits are given by:
XAMPLE
tot
The east-west power dissipation: P
The vertical power dissipation: P
The maximum (peak) power dissipation of the most
critical transistor: P
The case temperature: T
T
= 85 + (3 + 5)
T
= 102.6 + 10.5
T
= 102.6 + 5.2
P1(peak)
j(EW)(peak)
j(TRv)(peak)
= P
EW
+ P
= T
= T
= T
V
c
tot
+ (P
= 6 + 3 = 9 W
P1(peak)
P1(peak)
= 15 W (maximum value).
5 = 128.6 C
2.2 = 102.6 C
3 = 134.1 C
EW
TRv(peak)
+ P
+ R
+ R
c
TRv(peak)
th(EW-P1)
th(TRv-P1)
= 85 C.
= 5 W
V
)
P1(peak)
= 6 W
Product specification
EW
R
P
P
TDA8358J
EW
th(P1-c)
TRv(peak)
= 3 W
is given by: