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Service Manual CP-099/FS
4-6 TDA8357J Vertical Amplifier
4-6-1- Features
- Few external components required
- High efficiency fully DC coupled vertical bridge output circuit
- Vertical flyback switch with short rise and fall times
- Built-in guard circuit
- Thermal protection circuit
- Improved EMC performance due to differential inputs.
4-6-2- General description
The TDA8357 is a power circuit for use in 90
frequencies, and for 4:3 and 16:9 picture tubes. The IC contains a vertical deflection output circuit, operating
as a high efficiency class G system. The full bridge output circuit allows DC coupling of the deflection coil in
combination with single positive supply voltages.
The IC is constructed in a Low Voltage DMOS(LVDMOS) process that combines bipolar, CMOS and DMOS
devices. DMOS transistors are used in the output stage because of absence of second breakdown.
4-6-3- Quick reference data
SYMBOL PARAMETER
Supplies
V
supply voltage
P
V
flyback supply voltage
FB
I
average quiescent supply current
q(P)(av)
I
average quiescent flyback supply current
q(FB)(av)
P
total power dissipation
tot
Inputs and outputs
V
input voltage(peak-to-peak value)
i(P-P)
I
output current(peak-to-peak value)
o(P-P)
Flyback switch
I
maximum (peak) output current
o(peak)
Thermal data; in accordance with IEC 60747-1
T
storage temperature
stg
T
ambient temperature
amb
T
junction temperature
j
o
o
and 110
colour deflection systems for 25 for 200 Hz field
CONDITIONS MIN.
during scan
during scan
t 1.5 ms
-33-
TYP.
MAX. UNIT.
7.5
12
18
2 xV
45
66
P
-
10
15
-
10
15
-
-
8
-
1000
4500
-
-
2.0
-
-
1.2 A
+150 o C
-55
-
-25
-
+85
-
-
150
V
V
mA
mA
W
mV
A
o C
o C
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