DATA SHEET
Product specification
Supersedes data of March 1992
File under Integrated Circuits, IC02
1997 Jan 20
INTEGRATED CIRCUITS
TDA4861
Vertical deflection power amplifier
for monitors
1997 Jan 20
2
Philips Semiconductors
Product specification
Vertical deflection power amplifier for
monitors
TDA4861
FEATURES
Vertical pre-amplifier with differential inputs
Powerless vertical shift
Flyback voltage generation suitable for two operating
modes (doubling the supply voltage or external supply
for the short flyback time, this achieves a minimum of
power dissipation)
Vertical output stage with thermal and SOAR protection
High deflection frequency up to 140 Hz
High linear sawtooth signal amplification
Possibility of guarding the deflection
Voltage stabilizer.
GENERAL DESCRIPTION
The TDA4861 is a vertical power amplifier for differential
input signals suitable for colour monitor/TV systems with
deflection frequencies up to 140 Hz.
QUICK REFERENCE DATA
Measurements referenced to substrate (pin 6).
ORDERING INFORMATION
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P1
supply voltage (pin 1)
9
-
30
V
V
P2
supply voltage (pin 4)
9
-
60
V
V
P3
flyback supply voltage (pin 8)
9
-
60
V
I
P1
supply current (pin 1)
-
-
10
mA
I
P2
supply quiescent current (pin 4)
-
9
-
mA
V
I
input voltage (pins 2 and 3)
1.6
-
V
P1
-
0.5 V
I
5(p-p)
deflection output current (peak-to-peak value; pin 5)
-
-
2.8
A
T
amb
operating ambient temperature
-
20
-
+75
C
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA4861
SIL9P
plastic single in-line power package; 9 leads
SOT131-2
1997 Jan 20
3
Philips Semiconductors
Product specification
Vertical deflection power amplifier for
monitors
TDA4861
BLOCK DIAGRAM
Fig.1
Block diagram and application circuit with flyback supply voltage V
P3
from an external source.
Deflection frequency range from 50 to 100 Hz.
Assumed values:
I
yoke
= 1.42 A.
R
yoke
= 4.17
+ 7% +
R(T) = 6.12
.
L
yoke
= 5.25 mH.
R
1
= 1.0
1%.
T
amb
= 65
C.
T
j(max)
= 105
C.
T
yoke
= 75
C.
P
yoke
= 1.2 W.
P
IC
= 1.8 W.
P
tot
= 3.0 W.
t
pFLB
= typically 250
s.
Attention: the heatsink of the IC must be isolated against ground (it is connected to pin 6).
handbook, full pagewidth
MHA612
yoke
470
F
0.1
F
470
F
470
F
1 M
150 k
270
4.3
10 k
1.8 k
BAX13
-
8.1 V
+
52 V
R1
1
1.8 k
5.6
VP2
VP3
8
7
6
5
4
3
2
1
9
PCO
RPCO
VN
VP1
V-OUT
SUB
FLB
DIFFERENTIAL
INPUT
AMPLIFIER
VOLTAGE
STABILIZER
VERTICAL
DRIVER
from TDA4850
V-shift
+
8.8 V
VERTICAL
OUTPUT
TDA4861
THERMAL AND
SOAR
PROTECTION
FLYBACK
GENERATOR
FLYBACK
DRIVER
PULSE
CIRCUIT
1997 Jan 20
4
Philips Semiconductors
Product specification
Vertical deflection power amplifier for
monitors
TDA4861
PINNING
SYMBOL
PIN
DESCRIPTION
V
P1
1
supply voltage 1
INP1
2
input 1 of differential input amplifier
INP2
3
input 2 of differential input amplifier
V
P2
4
supply voltage 2 for vertical output
stage
V-OUT
5
vertical output
SUB
6
substrate
FLB
7
flyback generator output
V
P3
8
flyback supply voltage 3
PCO
9
pulse circuit output
Fig.2 Pin configuration.
handbook, halfpage
TDA4861
MEH360
1
2
3
4
5
6
7
8
9
VP1
VP2
VP3
INP1
INP2
SUB
PCO
FLB
V-OUT
FUNCTIONAL DESCRIPTION
Differential input amplifier
The differential sawtooth input signal (coming from a ramp
output of the TDA4850 for example) is fed to the input at
pins 2 and 3. The non-inverted signal is attached to pin 3.
The vertical feedback signal is superimposed on the
inverted input signal on pin 2.
Vertical shift is applied at the inputs in a power-less way
(see Fig.1).
Flyback generator
Signals for the flyback generator and the pulse circuit are
generated in the flyback driver stage. The flyback output
consists of a Darlington transistor and a flyback diode.
The flyback generator can operate in two modes:
1. An external supply voltage is applied for the short
flyback time, thus the power dissipation is minimum
(see Fig.1).
2. The flyback voltage is generated by doubling the
supply voltage (see Fig.5). The 100
F capacitor C2
connected between pins 4 and 7 is charged up to V
P1
during scan, using the external diode and the resistor
R2. The cathode of the capacitor C2 is connected to
the positive rail during flyback. Thus, the flyback
voltage is twice the supply voltage.
Vertical output
The vertical output stage is a quasi-complementary
class-B amplifier with a high linearity. The output contains
SOAR (short-circuit protection) and thermal protection.
The output current on pin 5 is reduced for a short time
(to let the temperature decrease to T
j
< 150
C), when the
junction temperature (T
j
) exceeds 160
C.
Deflection GUARD
Pin 9 will go HIGH if the junction temperature goes too
high (see Fig.3). A pulse signal with 50% duty cycle is
output on pin 9, if the deflection coil is open-circuit.
A flyback pulse signal is output at normal conditions.
Further watching can be achieved by means of an external
GUARD circuit as shown in Fig.4. The 22
F capacitor is
charged during flyback time (V
5
> V
8
) at normal conditions.
In the event of failures, the capacitor is discharged and the
GUARD output goes HIGH.
GUARD output level (see Fig.4):
LOW for normal conditions
HIGH for deflection coil short-circuit respectively
open-circuit
HIGH when there are neither input or output signals.
1997 Jan 20
5
Philips Semiconductors
Product specification
Vertical deflection power amplifier for
monitors
TDA4861
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134); voltages referenced to substrate (pin 6);
unless otherwise specified.
Notes
1. Internally limited by thermal protection; switching temperature point at 160
8
C.
2. Equivalent to discharging a 200 pF capacitor through a 0
series resistor.
THERMAL CHARACTERISTICS
The heatsink can be estimated according to application circuit (see Fig.1):
.
A heatsink is needed at R
th j-mb
< 5 K/W and R
th mb-h
= 0.5 K/W (using silicon grease) with
R
th h-a
= 22.2 K/W
-
(5 + 0.5) K/W = 16.7 K/W.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P1
supply voltage (pin 1)
-
40
V
V
P2
supply voltage (pin 4)
-
60
V
V
P3
supply voltage (pin 8)
-
60
V
V
2,3,9
voltage on pins 2, 3 and 9
-
V
P1
V
V
5,7
voltage on pins 5 and 7
-
60
V
I
4
current on pin 4
-
1
A
I
5 (M)
output current on pin 5 (peak value)
note 1
-
1.5
A
I
7 (M)
flyback current on pin 7 (peak value)
-
1.5
A
I
9
current on pin 9
-
-
8
mA
T
stg
storage temperature
-
25
+150
C
T
amb
operating ambient temperature
-
20
+75
C
T
j
junction temperature
note 1
-
168
C
V
es
electrostatic handling for all pins
note 2
-
300
V
SYMBOL
PARAMETER
VALUE
UNIT
R
th j-mb
thermal resistance from junction to mounting base
5
K/W
R
th j-a
R
th j-mb
R
th mb-h
R
th h-a
+
+
T
j(max)
T
amb
P
IC(max)
-----------------------------------
105
C
65
C
1.8 W
-----------------------------------------
22.2 K/W
=
=
=
=
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