Philips Semiconductors
Product specification
DC-coupled vertical deflection circuit
FEATURES
•
Few external components
•
Highly efficient fully DC-coupled vertical output bridge
circuit
•
Vertical flyback switch
•
Guard circuit
•
Protection against:
– short-circuit of the output pins (7 and 4)
– short-circuit of the output pins to V
P
•
Temperature protection
•
High EMC immunity because of common mode inputs
•
A guard signal in zoom mode.
QUICK REFERENCE DATA
SYMBOL
DC supply
V
P
I
q
Vertical circuit
I
O(p-p)
I
diff(p-p)
V
diff(p-p)
Flyback switch
I
M
V
FB
peak output current
flyback supply voltage
note 1
Thermal data (in accordance with IEC 747-1)
T
stg
T
amb
T
vj
Note
storage temperature
operating ambient temperature
virtual junction temperature
−55
−25
−
−
−
−
+150
+75
150
−
−
−
−
−
−
±1.5
50
60
output current
(peak-to-peak value)
differential input current
(peak-to-peak value)
differential input voltage
(peak-to-peak value)
−
−
−
−
600
1.5
3
−
1.8
supply voltage
quiescent supply current
9
−
−
30
25
−
PARAMETER
CONDITIONS
MIN.
TYP.
GENERAL DESCRIPTION
TDA8351
The TDA8351 is a power circuit for use in 90° and 110°
colour deflection systems for field frequencies of 50 to
120 Hz. The circuit provides a DC driven vertical
deflection output circuit, operating as a highly efficient
class G system.
MAX.
UNIT
V
mA
A
µA
V
A
V
V
°C
°C
°C
1. A flyback supply voltage of
>50
V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22
Ω
resistor
(depending on I
O
and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling
capacitor of V
FB
has to be connected between pin 6 and pin 3. This supply voltage line must have a resistance of
33
Ω
(see application circuit Fig.6).
1999 Sep 27
2
Philips Semiconductors
Product specification
DC-coupled vertical deflection circuit
PINNING
SYMBOL
I
drive(pos)
I
drive(neg)
V
P
V
O(B)
GND
V
FB
V
O(A)
V
O(guard)
V
I(fb)
PIN
1
2
3
4
5
6
7
8
9
DESCRIPTION
input power-stage (positive);
includes I
I(sb)
signal bias
input power-stage (negative);
includes I
I(sb)
signal bias
operating supply voltage
output voltage B
ground
input flyback supply voltage
output voltage A
guard output voltage
input feedback voltage
FUNCTIONAL DESCRIPTION
TDA8351
The vertical driver circuit is a bridge configuration. The
deflection coil is connected between the output amplifiers,
which are driven in opposite phase. An external resistor
(R
M
) connected in series with the deflection coil provides
internal feedback information. The differential input circuit
is voltage driven. The input circuit has been adapted to
enable it to be used with the TDA9150, TDA9151B,
TDA9160A, TDA9162, TDA8366 and TDA8376 which
deliver symmetrical current signals. An external resistor
(R
CON
) connected between the differential input
determines the output current through the deflection coil.
The relationship between the differential input current and
the output current is defined by: I
diff
×
R
CON
= I
coil
×
R
M
.
The output current is adjustable from 0.5 A (p-p) to 3 A
(p-p) by varying R
M
. The maximum input differential
voltage is 1.8 V. In the application it is recommended that
V
diff
= 1.5 V (typ). This is recommended because of the
spread of input current and the spread in the value of
R
CON
.
The flyback voltage is determined by an additional supply
voltage V
FB
. The principle of operating with two supply
voltages (class G) makes it possible to fix the supply
voltage V
P
optimum for the scan voltage and the second
supply voltage V
FB
optimum for the flyback voltage. Using
this method, very high efficiency is achieved.
The supply voltage V
FB
is almost totally available as
flyback voltage across the coil, this being possible due to
the absence of a decoupling capacitor (not necessary,
due to the bridge configuration). Built-in protections are:
•
thermal protection
•
short-circuit protection of the output pins (pins 4 and 7)
•
short-circuit protection of the output pins to V
P
.
A guard circuit V
O(guard)
is provided. The guard circuit is
activated at the following conditions:
•
during flyback
•
during short-circuit of the coil and during short-circuit of
the output pins (pins 4 and 7) to V
P
or ground
•
during open loop
handbook, 2 columns
I drive(pos)
1
2
I drive(neg)
VP
VO(B)
GND
V FB
VO(A)
VO(guard)
V I(fb)
3
4
5
6
7
8
9
MBC989
TDA8351
Metal block connected to substrate pin 5.
Metal on back.
•
when the thermal protection is activated.
This signal can be used for blanking the picture tube
screen.
Fig.2 Pin configuration.
1999 Sep 27
4
Philips Semiconductors
Product specification
DC-coupled vertical deflection circuit
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
DC supply
V
P
V
FB
Vertical circuit
I
O(p-p)
V
O(A)
Flyback switch
I
M
T
stg
T
amb
T
vj
R
th vj-c
R
th vj-a
t
sc
Notes
peak output current
−
−55
−25
−
−
−
note 3
−
output current (peak-to-peak value)
output voltage (pin 7)
note 1
note 2
−
−
−
3
supply voltage
flyback supply voltage
note 1
non-operating
−
−
−
−
PARAMETER
CONDITIONS
MIN.
TDA8351
MAX.
UNIT
40
25
50
60
V
V
V
V
A
V
V
52
62
±1.5
+150
+75
150
4
40
1
A
°C
°C
°C
K/W
K/W
hr
Thermal data (in accordance with IEC 747-1)
storage temperature
operating ambient temperature
virtual junction temperature
resistance v
j
-case
resistance v
j
-ambient in free air
short-circuiting time
1. A flyback supply voltage of
>50
V up to 60 V is allowed in application. A 220 nF capacitor in series with a 22
Ω
resistor
(depending on I
O
and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling
capacitor of V
FB
has to be connected between pin 6 and pin 3. This supply voltage line must have a resistance of
33
Ω
(see application circuit Fig.6).
2. I
O
maximum determined by current protection.
3. Up to V
P
= 18 V.
1999 Sep 27
5
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