INTEGRATED CIRCUITS
TDA8350Q
DC-coupled vertical deflection and East-West output circuit
Preliminary specification |
January 1995 |
Supersedes data of September 1991 |
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File under Integrated Circuits, IC02 |
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Philips Semiconductors
Philips Semiconductors |
Preliminary specification |
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DC-coupled vertical deflection and
TDA8350Q
East-West output 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
–short-circuit of the output pins to VP
∙High EMC immunity due to common mode inputs
∙Temperature (thermal) protection
∙East-West output stage with one single conversion resistor.
QUICK REFERENCE DATA
GENERAL DESCRIPTION
The TDA8350Q 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 and an East-West driver for sinking the diode modulator current.
SYMBOL |
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PARAMETER |
CONDITIONS |
MIN. |
TYP. |
MAX. |
UNIT |
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DC supply |
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VP |
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supply voltage |
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9 |
− |
25 |
V |
IP |
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quiescent current |
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− |
30 |
− |
mA |
Vertical circuit |
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IO(p-p) |
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output current (peak-to-peak value) |
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− |
− |
3 |
A |
Idiff(p-p) |
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differential input current |
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− |
600 |
− |
μA |
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(peak-to-peak value) |
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Vdiff(p-p) |
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differential input voltage |
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− |
1.5 |
1.8 |
V |
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(peak-to-peak value) |
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Flyback switch |
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IM |
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peak output current |
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− |
− |
±1.5 |
A |
VFB |
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flyback supply voltage |
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− |
− |
50 |
V |
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note 1 |
− |
− |
60 |
V |
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East-West amplifier |
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IO(sink) |
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output current (sink only) |
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− |
− |
500 |
mA |
VO(sink) |
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peak output voltage |
IO(sink) = 10 μA |
− |
− |
40 |
V |
Ibias |
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input bias current |
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− |
− |
1 |
μA |
Thermal data (in accordance with IEC 747-1) |
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Tstg |
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storage temperature |
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−65 |
− |
150 |
°C |
Tamb |
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operating ambient temperature |
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−25 |
− |
+75 |
°C |
Tvj |
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virtual junction temperature |
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− |
− |
150 |
°C |
Note
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
(dependent on IO and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling
capacitor of VFB has to be connected between pin 8 and pin 4. This supply voltage line must have a resistance of 33 Ω (see application circuit Fig.5).
January 1995 |
2 |
Philips Semiconductors |
Preliminary specification |
|
|
DC-coupled vertical deflection and
TDA8350Q
East-West output circuit
ORDERING INFORMATION
TYPE NUMBER |
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PACKAGE |
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NAME |
DESCRIPTION |
VERSION |
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TDA8350Q |
DBS13P |
plastic DIL-bent-SIL power package; 13 leads (lead length 12 mm) |
SOT141-6 |
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BLOCK DIAGRAM
handbook, full pagewidth |
VP |
VO(guard) |
VFB |
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4 |
10 |
8 |
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VP |
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CURRENT |
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SOURCE |
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TDA8350 |
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VP |
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9 |
VO(A) |
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VO(A) |
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1 |
I S |
I T |
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Idrive(pos) |
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3 |
VI(fb) |
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2 |
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I T |
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Idrive(neg) |
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VP |
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V |
I S |
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5 |
VO(B) |
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VO(B) |
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13 |
I I(set) |
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I I(set) |
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12 |
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11 |
VO(sink) |
I |
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I(corr) |
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7 |
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GND |
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MBC229-1 |
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Fig.1 Block diagram.
January 1995 |
3 |
Philips Semiconductors |
Preliminary specification |
|
|
DC-coupled vertical deflection and
TDA8350Q
East-West output circuit
PINNING
SYMBOL |
PIN |
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DESCRIPTION |
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Idrive(pos) |
1 |
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input power-stage (positive); |
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includes II(sb) signal bias |
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Idrive(neg) |
2 |
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input power-stage (negative); |
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includes II(sb) signal bias |
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VI(fb) |
3 |
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feedback voltage input |
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VP |
4 |
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supply voltage |
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VO(B) |
5 |
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output voltage B |
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n.c. |
6 |
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not connected |
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GND |
7 |
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ground |
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VFB |
8 |
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flyback supply voltage |
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VO(A) |
9 |
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output voltage A |
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VO(guard) |
10 |
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guard output voltage |
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VO(sink) |
11 |
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East-West amplifier driver (sink) |
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output voltage |
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II(corr) |
12 |
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East-West amplifier input |
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correction current (negative) |
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II(set) |
13 |
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East-West amplifier set input |
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current (positive) |
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book, halfpage |
I drive(pos) |
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1 |
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Idrive(neg) |
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2 |
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VI(fb) |
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3 |
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VP |
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4 |
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V O(B) |
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5 |
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n.c. |
6 |
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TDA8350 |
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GND |
7 |
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V FB |
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8 |
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VO(A) |
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9 |
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VO(guard) |
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10 |
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VO(sink) |
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11 |
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I I(corr) |
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12 |
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I I(set) |
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13 |
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MBC226-1 |
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Fig.2 |
Pin configuration. |
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FUNCTIONAL DESCRIPTION
The vertical driver circuit is a bridge configuration. The deflection coil is connected between the output amplifiers, which are driven in phase opposition. An external resistor (RM) connected in series with the deflection coil provides internal feed back 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 TDA8367 which deliver symmetrical current signals. An external resistor (RCON) 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: Idiff × RCON = I(coil) × RM. The output current is adjustable from 0.5 A (p-p) to 3 A
(p-p) by varying RM. The maximum input differential voltage is 1.8 V. In the application it is recommended that
Vdiff = 1.5 V (typ). This is recommended because of the spread of input current and the spread in the value of
RCON.
The flyback voltage is determined by an additional supply voltage VFB. The principle of operating with two supply voltages (class G) makes it possible to fix the supply voltage VP optimum for the scan voltage and the second supply voltage VFB optimum for the flyback voltage. Using this method, very high efficiency is achieved.
The supply voltage VFB 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). The output circuit is fully protected against the following:
∙thermal protection
∙short-circuit protection of the output pins (pins 5 and 9)
∙short-circuit of the output pins to VP.
A guard circuit VO(guard) is provided. The guard circuit is activated at the following conditions:
∙during flyback
∙during various short-circuit possibilities at the output pins
∙during open loop
∙when the thermal protection is activated.
This signal can be used for blanking the picture tube screen.
An East-West amplifier is also provided. This amplifier is an inverting amplifier which is current driven with sink current only capabilities.
January 1995 |
4 |
Philips Semiconductors |
Preliminary specification |
|
|
DC-coupled vertical deflection and
TDA8350Q
East-West output circuit
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL |
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PARAMETER |
CONDITIONS |
MIN. |
MAX. |
UNIT |
|
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|
DC supply |
|
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VP |
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supply voltage |
non-operating |
− |
40 |
V |
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− |
25 |
V |
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VFB |
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flyback supply voltage |
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− |
50 |
V |
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note 1 |
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60 |
V |
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Vertical circuit |
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IO |
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output current (peak-to-peak value) |
note 2 |
− |
3 |
A |
VO(A) |
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output voltage (pin 9) |
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− |
52 |
V |
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note 1 |
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62 |
V |
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Flyback switch |
|
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IM |
|
peak output current |
|
− |
±1.5 |
A |
East-West amplifier |
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VO(sink) |
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output voltage |
IO(sink) = 10 μA; note 3 |
− |
40 |
V |
IO(sink) |
|
output current |
VO(sink) = 2 V; note 3 |
− |
500 |
mA |
Thermal data (in accordance with IEC 747-1) |
|
|
|
|
||
|
|
|
|
|
|
|
Tstg |
|
storage temperature |
|
−65 |
150 |
°C |
Tamb |
|
operating ambient temperature |
|
−25 |
+75 |
°C |
Tvj |
|
virtual junction temperature |
|
− |
150 |
°C |
Rth vj-c |
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resistance vj-case |
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− |
4 |
K/W |
Rth vj-a |
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resistance vj-ambient in free air |
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− |
40 |
K/W |
tsc |
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short-circuiting time |
note 4 |
− |
1 |
hr |
Notes
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
(dependent on IO and the inductance of the coil) has to be connected between pin 7 and ground. The decoupling
capacitor of VFB has to be connected between pin 8 and pin 4. This supply voltage line must have a resistance of 33 Ω (see application circuit Fig.5).
2.IO maximum determined by current protection.
3.The operating area is limited by a straight line between the points VO(sink) = 40 V; IO(sink) = 10 μA and VO(sink) = 2 V; IO(sink) = 500 mA.
4.Up to Vp = 18 V.
January 1995 |
5 |
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