TEA2262.PDF

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SWITCH MODE POWER SUPPLY CONTROLLER
TEA2262
SWITCH MODE POWER SUPPLY CONTROLLER
. POSITIVE AND NEGATIVE OUTPUT CUR-
RENT UP TO 1A
. DIRECT DRIVE OF THE MOS POWER
TRANSISTOR
. TWO LEVELS TRANSISTOR CURRENT LIMI-
TATION
. DOUBLE PULSE SUPPRESSION
. SOFT-STARTING
. UNDER AND OVERVOLTAGE LOCK-OUT
. AUTOMATIC STAND-BY MODE
. LARGE POWER RANGE CAPABILITY IN
STAND-BY (Burst mode)
. INTERNAL PWM SIGNAL GENERATOR
DESCRIPTION
The TEA2262 is a monolithic integrated circuit for
the use in primary part of an off-line switching mode
power supply using a MOS power transistor.
All functions required for SMPS control under nor-
mal operating, transient or abnormal conditions are
provided.
The capability of working according to the ”master-
slave” concept, or according to the ”primary regu-
lation” mode makes the TEA2262 very flexible and
easy to use. This is particularly true for TV receiv-
ers where the IC provides an attractive and low cost
solution (no need of stand-by auxiliary power sup-
ply).
DIP16
(Plastic Package)
ORDER CODE : TEA2262
PIN CONNECTIONS
TRANSFORMER DEMAGNETIZATION
SENSING INPUT
IS
1
16
V
CC
POWER SUPPLY
SECONDARY PULSES INPUT
IN
2
15
V
POSITIVE OUTPUT STAGE SUPPLY
POWER TRANSISTOR
CURRENT LIMITATION INPUT
max.
3
4
14
13
OUT
GND
POWER OUTPUT
GROUND
GROUND
GND
GROUND
GND
5
12
GND
GROUND
ERROR AMPLIFIER INPUT (INVERTING)
E
6
11
R0
OSCILLATOR RESISTOR
ERROR AMPLIFIER OUTPUT
S
7
10
C0
OSCILLATOR CAPACITOR
OVERLOAD INTEGRATION CAPACITOR
C2
8
9
C1
SOFT-START CAPACITOR
April 1996
1/9
. LOW START-UP CURRENT
I
11018313.002.png
S
V CC
V+
7
16
15
TEA2262
Error
Amplifier
INTERNAL
BIAS
E
6
V CC MONITORING
V REF
2.49V
15.7V
V REF (2.49V)
8.5V 11.8V
Overvoltage
Protection
-1
MODULATOR
LOGIC
POSITIVE
OUTPUT
STAGE
+1A
(Max.)
Primary
Pulses
Regulation
Pulses
Modulators
IS
LOGIC
LOGIC
PROCESSOR
V CC
14
OUT
AUTOMATIC
BURST
GENERATION
NEGATIVE
OUTPUT
STAGE
-1A
(Max.)
Repetitive
Overload
Protection
Current
Limitation
Demagnetization
Sensing
45
m
A
T ON (Max.) (60%)
SOFT-START
OSCILLATOR
f/4
0.15V
2.55V 0.6V 0.84V
Secondary
Pulse
10
m
A
9
11
10
1
2
8
3
4
5
12 13
C 1
R 0
C 0
IS
IN
C 2
I MAX
GND
2262-02.EPS
11018313.003.png
TEA2262
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
Power Supply
V16-V4, 5, 12, 13
20
V
V+
Output Stage Power Supply
V15-V4, 5, 12, 13
20
V
I OUT +
Positive Output Current (source current)
1.5
A
I OUT -
Negative Output Current (sink current)
1.5
A
T j
Operating Junction Temperature
150
o C
T stg
Storage Temperature
-40, +150
o C
THERMAL DATA
Symbol
Parameter
Value
Unit
R th (j-c)
Junction-case Thermal Resistance
15
o C/W
R th (j-a) *
Junction-ambient Thermal Resistance
50
o C/W
* Soldered on a 35 m m, 40cm 2 board copper area
Figure 1 : Maximum Power Dissipation
4
P (W)
tot
3
o
50 C/W
2
1
T( )
AMB
o
0
50
100
150
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min.
Typ.
Max.
Unit
V CC
Power Supply
V CC stop
12
V CC max
V
I OUT +
Positive Output Current (source current)
1
A
I OUT -
Negative Output Current (sink current)
1
A
I OUT +
Average Positive Output Current
0.3
A
I OUT -
Average Negative Output Current
0.3
A
f oper
Operating Frequency
10
150
kHz
V IN
Input Pulses Amplitude (Pin 2)
1.5
2.5
4.5
V
R OSC
Oscillator Resistor Range
10
100
k
W
C OSC
Oscillator Capacitor Range
0.33
4.7
nF
C1
Soft-starting Capacitor Range
0.047
1
m
F
C2
Overload Integration Capacitor
0.047
1
m
F
C2/C1
Ratio C2/C1 (C2 must be
.
C1)
1
T amb
Operating Ambient Temperature
-20
70
o C
3/9
11018313.004.png
TEA2262
ELECTRICAL CHARACTERISTICS (T amb =25 o C, V CC =12V, unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
POWER SUPPLY
V CC(start)
Starting Voltage (V CC increasing)
9.5
11.8
13
V
V CC(stop)
Stopping Voltage (V CC decreasing)
7
8.5
9.5
V
Hyst V CC
Hysteresis (V CC(start) -V CC(Stop) )
2.7
3.3
3.7
V
I CC(start)
Starting Current (V CC = 9V)
0.5
mA
I CC
Supply Current (V CC = 12V)
6.5
mA
V CC(max)
Overvoltage Threshold on V CC
15
15.7
V
I CC(over)
Supply Current after Overvoltage Detection (V CC = 17V)
35
mA
OSCILLATOR / PWM SECTION
D
F
F
Accuracy (R OSC = 68k
W
,C OSC = 1nF)
10
%
t ON max
Maximum Duty Cycle in Primary Regulation Mode
50
60
70
%
ERROR AMPLIFIER SECTION
A VO
Open Loop Gain
75
dB
F ug
Unity Gain Frequency
550
kHz
I SC
Short Circuit Output Current (Pin 7 connected to ground)
2
mA
I BE
E Input Bias Current (Pin 6)
0.08
m
A
V REF
Internal Voltage Reference
(connected to error amplifier input and not directly accessible)
2.34
2.49
2.64
V
INPUT SECTION
V IN
IN Input Threshold (Pin 2)
0.6
0.85
1.2
V
V IS
IS Input Threshold (Pin 1)
0.15
V
I BIN
IN Input Bias Current
0.3
m
A
I BIS
IS Input Bias Current
0.4
m
A
CURRENT LIMITATION SECTION
V IM1
First Current Limitation Threshold
550
600
650
mV
V IM2
Second Current Limitation Threshold
780
840
900
mV
D
V IM
Thresholds Difference V IM2 -V IM1
190
240
280
mV
V C2
Lock-out Threshold on Pin C2
2.25
2.55
2.85
V
I DC2
Capacitor C2 Discharge Current
10
m
A
I CC2
Capacitor C2 Charge Current
45
m
A
I BI(max)
Maximum Input Bias Current (Pin 3)
0.2
m
A
4/9
11018313.005.png
TEA2262
SIMPLIFIED APPLICATION DIAGRAMS
Figure 1 : Master-slave Concept
AUDIO
OUTPUT
STAGE
Muting
Control
R
MAINS
INPUT
P 1
Synchronization
SCANNING
DEVICE
Remote
Stand-by
P
2
C
VOLTAGE
REGULATOR
Remote
Stand-by
V CC
TEA2262
SLAVE
TEA5170
MASTER
m
P
V CC
INFRA-RED
RECEIVER
PWM
P : Output voltage adjusteme nt in normal mode
P : Output voltage adjuste ment in stand- by
1
Power primary ground
Secondary ground (isolated from mains)
2
Figure 2 : Secondary Regulation (with optocoupler)
AUDIO
OUTPUT
STAGE
Muting
Control
R
MAINS
INPUT
P
SCANNING
DEVICE
Remote
Stand-by
C
VOLTAGE
REGULATOR
V CC
TEA2262
m
P
V CC
INFRA-RED
RECEIVER
P : Output voltage adjustement
Power primary ground
Secondary ground (isolated from mains)
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11018313.001.png

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