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TDA4865AJ Datasheet PDF : 18 Pages
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NXP Semiconductors
TDA4865J; TDA4865AJ
Vertical deflection booster
TDA4865J_TDA4865AJ_2
Product data sheet
Table 9. Calculated values
Symbol
Value
TDA4865J
VP1
VN
Ptot
Pdefl
PIC
Rth(tot)(max)
Tj(max)[1]
tflb
8
−13
8.5
3.85
4.65
12.9
93
650
[1] With a heat sink of 2 K/W.
Unit
TDA4865AJ
15
V
−15
V
12.1
W
3.85
W
8.25
W
7.27
K/W
103.6
°C
720
µs
VP1, VN and VFB are referenced to ground of application; voltages are calculated with
+10 % tolerances.
The calculation formulae for supply voltages are as follows:
VP1 = – Vo(sat)p + (R1 + Rdeflcoil) × Idefl(max) – U'L + UD1
(1)
V N = Vo(sat)n + (R1 + Rdeflcoil) × Idefl(max) + U'L
(2)
where:
U’L = Ldeflcoil × 2Idefl(max) × fv
fv = vertical deflection frequency
UD1 = forward voltage drop across D1
The calculation formulae for power consumption is:
PIC = Ptot – Pdefl
(3)
Ptot = (V P1 – UD1) × -I--d---e--f--l4-(--m----a--x--) + V N × -I--d---e--f--l4-(--m----a--x--) + (V P1 + V N ) × 0.01 + 0.2
(4)
Pdefl
=
-R---d---e--f--l--c--o---i-l---+-----R----1-
3
×
I
2
d
e
fl(ma
x)
(5)
where:
PIC = power dissipation of the IC
Ptot = total power dissipation
Pdefl = power dissipation of the deflection coil
Calculation formulae for maximum required thermal resistance for the heat sink at
Tj(max) = 110 °C:
Rth(tot) = Rth( j-mb) + Rth(mb-h) + Rth(h-a)
Rth(h-a) = T-----j--(--m---a--P-x--)-I--–C-----T----a--m----b – Rth( j-mb) – Rth(mb-h)
Rev. 02 — 3 November 2006
(6)
(7)
© NXP B.V. 2006. All rights reserved.
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