Philips TDA8356 Service Manual
INTEGRATED CIRCUITS
DATA SH EET
TDA8356
DC-coupled vertical deflection
circuit
Preliminary specification
File under Integrated Circuits, IC02
Philips Semiconductors
January 1995
Philips Semiconductors Preliminary specification
DC-coupled vertical deflection circuit TDA8356
FEATURES
• Few external components
• Highly efficient fully DC-coupled vertical output bridge
circuit
• Vertical flyback switch
GENERAL DESCRIPTION
The TDA8356 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.
• Guard circuit
• Protection against:
– short-circuit of the output pins (7 and 4)
– short-circuit of the output pins to V
P
• Temperature (thermal) protection
• High EMC immunity because of common mode inputs
• A guard signal in zoom mode.
QUICK REFERENCE DATA
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
DC supply
V
P
I
q
supply voltage 9 4.5 25 V
quiescent supply current − 30 − mA
Vertical circuit
I
O(p-p)
output current
−−2A
(peak-to-peak value)
I
diff(p-p)
V
diff(p-p)
differential input current (peak-to-peak value) − 600 −µA
differential input voltage (peak-to-peak value) − 1.5 1.8 V
Flyback switch
I
M
V
FB
peak output current −−±1A
flyback supply voltage −−50 V
Thermal data (in accordance with IEC 747-1)
T
stg
T
amb
T
vj
storage temperature −55 − +150 °C
operating ambient temperature −25 − +75 °C
virtual junction temperature −−150 °C
January 1995 2
Philips Semiconductors Preliminary specification
DC-coupled vertical deflection circuit TDA8356
ORDERING INFORMATION
TYPE NUMBER
TDA8356 SIL9P plastic single-in-line power package; 9 leads SOT131-2
BLOCK DIAGRAM
handbook, full pagewidth
NAME DESCRIPTION VERSION
V
P
36
V
P
TDA8356
I
drive(pos)
I
drive(neg)
1
2
V
V
O(guard)
8
CURRENT
SOURCE
I
S
I
S
I
T
I
T
PACKAGE
V
FB
V
P
V
V
O(A)
P
7
V
O(A)
9
V
I(fb)
5
GND
Fig.1 Block diagram.
January 1995 3
V
O(B)
MGC091
4
V
O(B)
Philips Semiconductors Preliminary specification
DC-coupled vertical deflection circuit TDA8356
PINNING
SYMBOL PIN DESCRIPTION
I
drive(pos)
I
drive(neg)
V
P
V
O(B)
1 input power-stage (positive);
includes I
signal bias
I(sb)
2 input power-stage (negative);
includes I
signal bias
I(sb)
3 operating supply voltage
4 output voltage B
GND 5 ground
V
FB
V
O(A)
V
O(guard)
V
I(fb)
handbook, 2 columns
Metal block connected to substrate pin 5.
Metal on back.
6 input flyback supply voltage
7 output voltage A
8 guard output voltage
9 input feedback voltage
I
drive(pos)
I
drive(neg)
V
O(guard)
V
V
V
V
O(B)
GND
V
FB
O(A)
I(fb)
1
2
3
P
4
5
TDA8356
6
7
8
9
MGC092
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 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
) connected between the differential input
(R
CON
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=Icoil
× RM.
The output current is adjustable from 0.5 A (p-p) to
2 A (p-p) by varying RM. The maximum input differential
voltage is 1.8 V. In the application it is recommended that
V
= 1.5 V (typ). This is recommended because of the
diff
spread of input current and the spread in the value of
R
.
CON
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 4 and 7)
• short-circuit of the output pins to V
A guard circuit V
is provided. The guard circuit is
O(guard)
P.
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 VP or ground
• during open loop
• when the thermal protection is activated.
Fig.2 Pin configuration.
January 1995 4
This signal can be used for blanking the picture tube
screen.
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