Philips TDA4861 User manual
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
VP1 supply voltage (pin 1) 9 −30 V
VP2 supply voltage (pin 4) 9 −60 V
VP3 flyback supply voltage (pin 8) 9 −60 V
IP1 supply current (pin 1) −−10 mA
IP2 supply quiescent current (pin 4) −9−mA
VIinput voltage (pins 2 and 3) 1.6 −VP1 −0.5 V
I5(p-p) deflection output current (peak-to-peak value; pin 5) −−2.8 A
Tamb 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 VP3 from an external source.
Deflection frequency range from 50 to 100 Hz.
Assumed values:
Iyoke = 1.42 A.
Ryoke = 4.17 Ω+7%+∆R(T) = 6.12 Ω.
Lyoke = 5.25 mH.
R1= 1.0 Ω±1%.
Tamb =65°C.
Tj(max) = 105 °C.
Tyoke =75°C.
Pyoke = 1.2 W.
PIC = 1.8 W.
Ptot = 3.0 W.
tpFLB = typically 250 µs.
Attention: the heatsink of the IC must be isolated against ground (it is connected to pin 6).
handbook, full pagewidth
MHA612
yoke
470
µF0.1 µF
470 µF
470 µF
1 MΩ
150 kΩ270 Ω
4.3 Ω10 kΩ
1.8 kΩ
BAX13
−8.1 V +52 V
R1
1 Ω
1.8 kΩ
5.6 Ω
VP2 VP3
87654321 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
VP1 1 supply voltage 1
INP1 2 input 1 of differential input amplifier
INP2 3 input 2 of differential input amplifier
VP2 4supply voltage 2 for vertical output
stage
V-OUT 5 vertical output
SUB 6 substrate
FLB 7 flyback generator output
VP3 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 µF capacitor C2
connected between pins 4 and 7 is charged up to VP1
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 Tj< 150 °C), when the
junction temperature (Tj) 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.
Furtherwatchingcanbeachievedbymeansofanexternal
GUARD circuit as shown in Fig.4. The 22 µF capacitor is
chargedduringflybacktime(V5>V
8
)atnormalconditions.
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 Ωseries resistor.
THERMAL CHARACTERISTICS
The heatsink can be estimated according to application circuit (see Fig.1):
.
A heatsink is needed at Rth j-mb < 5 K/W and Rth mb-h = 0.5 K/W (using silicon grease) with
Rth h-a = 22.2 K/W −(5 + 0.5) K/W = 16.7 K/W.
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
VP1 supply voltage (pin 1) −40 V
VP2 supply voltage (pin 4) −60 V
VP3 supply voltage (pin 8) −60 V
V2,3,9 voltage on pins 2, 3 and 9 −VP1 V
V5,7 voltage on pins 5 and 7 −60 V
I4current on pin 4 −1A
I
5 (M) output current on pin 5 (peak value) note 1 −±1.5 A
I7 (M) flyback current on pin 7 (peak value) −±1.5 A
I9current on pin 9 −−8mA
T
stg storage temperature −25 +150 °C
Tamb operating ambient temperature −20 +75 °C
Tjjunction temperature note 1 −168 °C
Ves electrostatic handling for all pins note 2 −±300 V
SYMBOL PARAMETER VALUE UNIT
Rth j-mb thermal resistance from junction to mounting base 5 K/W
Rth j-a Rth j-mb Rth mb-h Rth h-a
++ T
j(max) Tamb
–
PIC(max)
----------------------------------- 105 °C65°C–
1.8 W
----------------------------------------- 22.2 K/W====
1997 Jan 20 6
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors TDA4861
CHARACTERISTICS
VP1 =V
P2 = 25 V; VN=V
6=0V;T
amb =25°C; voltages referenced to substrate (pin 6); unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VP1 supply voltage 1 (pin 1) 9 25 30 V
VP2 supply voltage 2 (pin 4) 9 25 60 V
VP3 supply voltage 3 (pin 8) 9 −60 V
IP1 supply current (pin 1) −−10 mA
IP2 quiescent supply current (pin 4) without input signal −9−mA
Pre-amplifier
V2,3 input voltage (pins 2 and 3) 1.6 −VP1 −0.5 V
I2,3 input quiescent current without input signal −100 −nA
Flyback generator
V7output voltage upper value; I7=−1A −V
P3 −2.2 −V
I7(M) flyback output current
(maximum value; pin 7) −−±1.3 A
V1-5 threshold voltage to switch flyback on/off threshold −1.4 −V
tpFLB flyback pulse time see Figs 1 and 3 −250 −µs
Vertical output; see Fig.3
V5output voltage upper value; I5=−1A V
P2 −2.3 VP2 −2−V
lower value; I5=1A −1.5 1.7 V
upper value;
I5=−1.4 A −VP2 −2.3 −V
lower value; I5= 1.4 A −1.7 −V
I5(p-p) vertical output current
(peak-to-peak value; pin 5) −−2.8 A
LIN non-linearity of output signal −−1%
Pulse circuit output; see Fig.3
V9output voltage RPCO =10kΩ;
see Fig.1 0.4 −VP1 −0.4 V
V9output voltage for thermal protection
active VP1 −0.4 −−V
V
1-5 voltage to insert flyback pulse on pin 9 normal condition −−1.4 V
tp9 pulse width deflection open-circuit −50 −%
normal condition tpFLB −−µs
1997 Jan 20 7
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors TDA4861
Fig.3 Vertical timing.
handbook, full pagewidth
t
t
t
t
t
t
input signal
on pin 2
input signal
on pin 3
output signal
on pin 5
INP1
INP2
V-OUT
output signal
on pin 9 for thermal
protection active
output signal
on pin 9 for
normal condition
output signal
on pin 9 for deflection
unit open-circuit
tpFLB = 250 µs
tp9
50%
MEH361
PCO
PCO
PCO
1997 Jan 20 8
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors TDA4861
APPLICATION INFORMATION
Fig.4 GUARD circuit application on vertical output.
handbook, full pagewidth
MEH362
TDA4861
8
VP3
VP
52.2 Ω3.3 kΩ
220 kΩ
>1 kΩ
22 µF
BC548
GUARD output
HIGH = error
2N5819
BAX13
vertical
output
signal
Fig.5 Application for flyback voltage generation by doubling the supply voltage.
handbook, full pagewidth
MEH359
yoke
470
µF0.1 µF
5.25 mH
C2 100 µF
470 µF
1 MΩ
150 kΩ270 Ω10 kΩ
1.8 kΩ
BAX13
−7.8 V
R1
1 Ω
1.8 kΩ
5.6 ΩR2 240 Ω
VP2 VP3
87654321 9
PCO
RPCO
VN
VP1 V-OUT SUB FLB
DIFFERENTIAL
INPUT
AMPLIFIER
VOLTAGE
STABILIZER VERTICAL
DRIVER
from TDA4850
V-shift
+9 V
VERTICAL
OUTPUT
TDA4861 THERMAL AND
SOAR
PROTECTION
FLYBACK
GENERATOR
FLYBACK
DRIVER
PULSE
CIRCUIT
1997 Jan 20 9
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors TDA4861
Fig.6 Internal circuitry.
handbook, full pagewidth
MHA611
V-OUTINP2INP1
12 3 657894
SUB PCOVP3
VP2
VP1
TDA4861
1997 Jan 20 10
Philips Semiconductors Product specification
Vertical deflection power amplifier for
monitors TDA4861
PACKAGE OUTLINE
UNIT A b
max. bp2 cD
(1) E(1) Z(1)
deD
hLj
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
mm 4.6
4.2 1.1 0.75
0.60 0.48
0.38 24.0
23.6 20.0
19.6 10 2.54
12.2
11.8 3.4
3.1
A
max.
1
2.0
Eh
62.00
1.45
2.1
1.8
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
17.2
16.5
SOT131-2 92-11-17
95-03-11
0 5 10 mm
scale
Q
0.25
w
0.03
x
D
L
A
E
c
A2
Q
wM
bp
d
D
Ze
xh
19
E
h
non-concave
seating plane
1
b
j
SIL9P: plastic single in-line power package; 9 leads SOT131-2
view B: mounting base side
B
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