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TDA4866 Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA4866
Description  Full bridge current driven vertical deflection booster
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

 9 page
background image
1999 Jun 14
9
Philips Semiconductors
Product specification
Full bridge current driven vertical deflection
booster
TDA4866
Example
Notes
1. A layer of silicon grease between
the mounting base and the
heatsink optimizes thermal
resistance.
2. Tj(max) =PIC
× [Rth(j-mb) + Rth(mb-amb)]+Tamb
SYMBOL
VALUE
UNIT
Values given from application
Idefl(max)
0.71
A
Ldeflcoil
5.2
mH
Rdeflcoil
5.4 [= 4.2 +
7% +
∆R(ϑ)]
Rm
1 (+1%)
Rp
180
Rref
1.6
k
VFB
35
V
Tamb
+50
°C
Tdeflcoil
+75
°C
Rth(j-mb)
4
K/W
Rth(mb-amb)(1)
8
K/W
Calculated values
VP
8.6
V
tflb
270
µs
Ptot
3.65
W
Pdefl
0.9
W
PIC
2.75
W
Rth(tot)
12
K/W
Tj(max)(2)
+83
°C
Calculation formula for supply voltage and power consumption
Vb1 =V6, 3 +Rdeflcoil × Idefl(max) − U’L +Rm × Idefl(max) +V4
Vb2 =V6 +Rdeflcoil × Idefl(max) +U’L +Rm × Idefl(max) +V4, 3
for Vb1 >Vb2 :VP =Vb1
for Vb2 >Vb1 :VP =Vb2
with:
U’L =Ldeflcoil × 2Idefl(max) × fv
fv = vertical deflection frequency.
PIC = power dissipation of the IC
Pdefl = power dissipation of the deflection coil
Ptot = total power dissipation.
Calculation formula for flyback time (tflb)
with:
tflb(off) = flyback switch off time = 50 µs for this application (tflb(off) depends on
VFB, Idefl(max), Ldeflcoil and CSP).
To achieve good noise suppression the following values for Rp are
recommended:
Recommended values
Ldeflcoil
(mH)
Rp
(
Ω)
3
100
6
180
10
240
15
390
P
tot
V
P
I
defl(max)
2
--------------------
V
P
+
0.03 A
0.1 W
V
FB
I
FB
×
++
×
×
=
P
defl
1
3
--- R
deflcoil
R
m
+
() I
defl(max)
2
×
=
P
IC
P
tot
P
defl
=
t
flb
L
deflcoil
R
deflcoil
R
m
+
---------------------------------
1
R
deflcoil
R
m
+
() I
defl(max)
×
V
FB
V
7r
V
6r
+
-------------------------------------------------------------------
+
1
R
deflcoil
R
m
+
() I
defl(max)
×
V
FB
V
7f
V
6f
()
-------------------------------------------------------------------
-----------------------------------------------------------------------------






ln
×
=
t
flb(off)
+




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