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TDA4867 Datasheet(PDF) 11 Page - NXP Semiconductors

Part No. TDA4867
Description  Full bridge current driven vertical deflection booster
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 11 page
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2003 Feb 05
11
Philips Semiconductors
Preliminary specification
Full bridge current driven vertical
deflection booster
TDA4867J
Example
Table 1
Values given from application diagram Fig.6
Note
1. Use heatsink compound.
Table 2
Calculated values
Note
1. Tj(max) =PIC × [Rth(j-mb) +Rth(mb-amb)]+Tamb.
SYMBOL
VALUE
UNIT
Idefl
0.71
A
Ldeflcoil
5.2
mH
Rdeflcoil
5.4 [= 4.2 + 7% +
∆R(ϑ)] Ω
Rm
1 (+1%)
Rp
220
Rref
3.4
k
VFB
40
V
Tamb
50
°C
Tdeflcoil
75
°C
Rth(j-mb)
4
K/W
Rth(mb-amb)(1)
6
K/W
SYMBOL
VALUE
UNIT
VP
8.5
V
tflb
≈200
µs
Ptot
3.4
W
Pdefl
0.9
W
PIC
2.5
W
Rth(tot)
10
K/W
Tj(max)(1)
75
°C
Calculation formulae for supply voltage:
Vb1 =Vsat(VP-OUTA) +Rdeflcoil × Idefl − U’L +Rm × Idefl +Vsat(OUTB-GND)
Vb2 =Vsat(OUTA-GND) +Rdeflcoil × Idefl +U’L +Rm × Idefl +Vsat(VP-OUTB)
for Vb1 >Vb2 :VP =Vb1
for Vb2 >Vb1 :VP =Vb2
where:
U’L =Ldeflcoil × 2 × Idefl × fv
fv = vertical deflection frequency.
Calculation formulae for power consumption:
where:
PIC = power dissipation of the TDA4867J
Ptot = total power dissipation
Pdefl = power dissipation of the deflection coil.
Calculation formulae for flyback time (tflb):
P
IC
P
tot
P
defl
=
P
tot
V
P
I
defl
2
---------
V
P
+
0.02 A
0.1 W
V
FB
I
FB
×
++
×
×
=
P
defl
1
3
---
R
deflcoil
R
m
+
()
×
I
defl
2
×
=
t
flb
L
deflcoil
R
deflcoil
R
m
+
---------------------------------
V
FB
R
deflcoil
R
m
+
() I
defl
×
+
V
FB
R
deflcoil
R
m
+
() I
defl
×
---------------------------------------------------------------------
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