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TDA4867J Datasheet, PDF (11/14 Pages) NXP Semiconductors – Full bridge current driven vertical deflection booster | |||
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Philips Semiconductors
Full bridge current driven vertical
deï¬ection booster
Preliminary speciï¬cation
TDA4867J
Example
Table 1 Values given from application diagram Fig.6
SYMBOL
Ideï¬
Ldeï¬coil
Rdeï¬coil
Rm
Rp
Rref
VFB
Tamb
Tdeï¬coil
Rth(j-mb)
Rth(mb-amb)(1)
VALUE
0.71
5.2
5.4 [= 4.2 + 7% + âR(Ï)]
1 (+1%)
220
3.4
40
50
75
4
6
UNIT
A
mH
â¦
â¦
â¦
kâ¦
V
°C
°C
K/W
K/W
Note
1. Use heatsink compound.
Table 2 Calculated values
SYMBOL
VP
tï¬b
Ptot
Pdeï¬
PIC
Rth(tot)
Tj(max)(1)
VALUE
8.5
â200
3.4
0.9
2.5
10
75
UNIT
V
µs
W
W
W
K/W
°C
Note
1. Tj(max) = PIC Ã [Rth(j-mb) + Rth(mb-amb)] + Tamb.
Calculation formulae for supply voltage:
Vb1 = Vsat(VP-OUTA) + Rdeflcoil à Idefl â UâL + Rm à Idefl + Vsat(OUTB-GND)
Vb2 = Vsat(OUTA-GND) + Rdeflcoil à Idefl + UâL + Rm à Idefl + Vsat(VP-OUTB)
for Vb1 > Vb2 : VP = Vb1
for Vb2 > Vb1 : VP = Vb2
where:
UâL = Ldeflcoil à 2 à Idefl à fv
fv = vertical deflection frequency.
Calculation formulae for power consumption:
PIC = Ptot â Pdefl
Ptot = VP Ã -I-d-2--e--f-l + VP Ã 0.02 A + 0.1 W + VFB Ã IFB
Pdefl = 13-- Ã (Rdeflcoil + Rm) Ã Id2efl
where:
PIC = power dissipation of the TDA4867J
Ptot = total power dissipation
Pdefl = power dissipation of the deflection coil.
Calculation
formulae
for
flyback
time
(tflb):
tflb
â
R-----d---eL--f-l-dc--e-o--fi-ll-c--+o---i-l-R----m--
Ã
ln

ï£
-VV----FF---BB----+â-----((--RR-----dd--ee---ff-ll-cc--oo---ii-ll--+-+----RR-----mm----))---Ã-Ã----I-I-dd---ee--ff-ll
2003 Feb 05
11
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