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TEA2262
SWITCH MODE POWER SUPPLY CONTROLLER
1/13May 2004
TEA2262SWITCH MODE POWER SUPPLY CONTROLLER
REV. 2
FEATURES SUMMARY POSITIVE AND NEGATIVE OUTPUT
CURRENT UP TO 1A LOW START-UP CURRENT DIRECT DRIVE OF THE MOS POWER
TRANSISTOR TWO LEVELS TRANSISTOR CURRENT
LIMITATION 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
DESCRIPTIONThe 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
supply).
Figure 1. Package
Figure 2. Pin Connections
TEA2262
Figure 3. Block Diagram
3/13
TEA2262
Table 1. Absolute Maximum Ratings
Table 2. Thermal DataNote:1. Soldered on a 35µm, 40cm2 board copper area.
Figure 4. Maximum Power Dissipation
Table 3. Recommended Operating Conditions
TEA2262
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VCC =12V, unless otherwise specified)
Table 4. Power Supply
Table 5. Oscillator / PWM Section
Table 6. Error Amplifier Section
Table 7. Input Section
5/13
TEA2262
Table 8. Current Limitation Section
TEA2262
SIMPLIFIED APPLICATION DIAGRAMS
Figure 5. Master-slave Concept
Figure 6. Secondary Regulation (with optocoupler)
7/13
TEA2262
GENERAL DESCRIPTIONThe TEA2262 is an off-line switch mode power
supply controller. The synchronization function
and the specific operation in stand-by mode make
it well adapted to video applications such as TV
sets, VCRs, monitors, etc...
The TEA2262 can be used in two types of archi-
tectures: Master/slave architecture. In this case, the
TEA2262 drives the power transistor according
to the pulse width modulated signals generated
by the secondary located master circuit. A pulse
transformer provides the feedback (see Figure
5). Conventional architecture with linear feedback
signal (feedback sources : optocoupler or
transformer winding) (see Figure 6).
Using the TEA2262, the stand-by auxiliary power
supply, often realized with a small but costly 50Hz
transformer, is no longer necessary. The burst
mode operation of the TEA2262 makes possible
the control of very low output power (down to less
than 1W) with the main power transformer.
When used in a master/slave architecture, the
TEA2262and also the power transistor turn-off can
be easily synchronized with the line transformer.
The switching noise cannot disturb the picture in
this case.
As an S.M.P.S. controller, the TEA2262 features
the following functions: Power supply start-up (with soft-start) PWM generator Direct power transistor drive (±1A) Safety functions : pulse by pulse current
limitation, output power limitation, over and
under voltage lock-out.
S.M.P.S. OPERATING DESCRIPTION
Starting Mode - Stand By Mode Power for circuit supply is taken from the mains
through a high value resistor before starting. As
long as VCC of the TEA2262 is below VCC start,
the quiescent current is very low (typically 0.5mA)
and the electrolytic capacitor across VCC is linearly
charged. When VCC reaches VCC start (typically
11.8V), the circuit starts, generating output pulses
with a soft-starting. Then the SMPS goes into the
stand-by mode and the output voltage is a per-
centage of the nominal output voltage (eg. 80%).
During starting phase, in order to avoid transform-
er magnetization (specially at high frequency), the
frequency oscillator is divided by four.
At switch-on, C0 charging current is divided by
four. It recover its normal value when the voltage
on soft-start capacitor reach 2.5V.
The current also recover its standard value when
the soft-start capacitor is discharged because of a
burst operating mode (starting in stand-by).
In other words, the charging current will become
and stay at its normal value, as soon as one of the
following events occurs:
–VC1 rearch 2.5V
–C1 is discharged by burst operating mode
For this the TEA2262 contains all the functions re-
quired for primary mode regulation: a fixed fre-
quency oscillator, a voltage reference, an error
amplifier and a pulse width modulator (PWM).
For transmission of low power with a good efficien-
cy in stand-by, an automatic burst generation sys-
tem is used, in order to avoid audible noise.
Normal Mode (secondary regulation)The normal operating of the TV set is obtained by
sending to the TEA2262 regulation pulses gener-
ated by a regulator located in the secondary side
of the power supply (TEA5170 for example).
This architecture uses the ”Master-slave Con-
cept”, advantages of which are now well-known
especially the very high efficiency in stand-by
mode, and the accurate regulation in normal
mode.
Stand-by mode or normal mode are obtained by
supplying or not the secondary regulator. This can
be ordonnered for example by a microprocessor in
relation with the remote control unit.
Regulation pulses are applied to the TEA2262
through a small pulse-transformer to the IN input
(pin 2). This input is sensitive to positive square
pulses. The typical threshold of this input is 0.85V.
The frequency of pulses coming from the second-
ary regulator can be lower or higher than the fre-
quency of the starting oscillator.
The TEA2262 has no soft-starting system when it
receives pulses from the secondary.The soft-start-
ing has to be located in the secondary regulator.
Due to the principle of the primary regulation, puls-
es generated by the starting system automatically
disappear when the voltage delivered by the
SMPS increases.
