Datasheet TEA2261, TEA2260 Datasheet (SGS Thomson Microelectronics)

SWITCH MODE POWER SUPPLY CONTROLLER

.

POSITIVE AND NEGATIVE CURRENT UP TO

1.2A and – 2A

.

LOW START-UP CURR ENT

.

DIRECT DRIVE OF THE POWER TRANSIS­TOR

.

TWO LEVELS TRANSISTOR CURRENT LIMI­T ATION

.

DOUBLE PULSE SUPPRE SS ION

.

SOFT-STARTING

.

UNDER AND OVER VOLTAGE LOCK-OUT

.

AUTOMATIC STAND-BY MODE RECOGNI­TION

.

LARGE POWER RANGE CAPABILITY IN
STAND-BY (B urs t mode)

.

INTERNAL PWM SIGNAL GENERATOR

TEA2260
TEA2261

DESCRIPTION

The TEA2260/61 is a monolithic integrated circuit
for the use in primary part of an off-line switching
mode power supply.

All functions required for SMPS control under nor­mal operating, transient or abnormal conditions are
provided.

The capability of working according to the "master­slave" concept, or according to the "primary regu­lation" mode makes the TEA2260/61 very flexible
and easy to use. This is particularly true for TV
receivers where the IC provides an attractive and
low cost solution (no need of stand-by auxiliary
power supply). See application note AN376/0490
for detailed information.

PIN CONNECTIONS

I

MAX

GND
GND

C2

IS
IN

E
S

TRANSFORMER DEMAGNETIZATION SENSING INPUT

SECONDARY PULSES INPUT

POWER TRANSISTOR CURRENT LIMITATION INPUT

GROUND
GROUND

ERROR AMPLIFIER INPUT (INVERTING)

ERROR AMPLIFIER OUTPUT

OVERLOAD INTEGRATION CAPACITOR

BATWING DIP 16

(Plastic Package)

ORDER CODES : TEA2260 - TEA2261

1
2
3
4
5
6
7
8

V

16
15
14
13
12
11
10

9

POWER SUPPLY

CC

V+

POSITIVE OUTPUT STAGE SUPPLY

OUT

POWER OUTPUT

GND

GROUND

GND

GROUND

R0

OSCILLATOT RESISTOR

C0

OSCILLATOR CAPACITOR

C1

SOFT-START CAPACITOR

2261-01.EPS

June 1992

1/9

TEA2260 - TEA2261

SIMPLIFIED APPLICATION DIAGRAMS
Figure 1 : Master-slave Concept

R

MAINS
INPUT

P

C

V

CC

2

TEA2260/61

SLAVE

P : Output voltage adjustement in normal mode

1

P : Output voltage adjustement in stand-by

2

Figure 2 : Secondary Regulation (with optocoupler)

P

1

TEA5170
MASTER

PWM

Synchronization

AUDIO

OUTPUT

STAGE

SCANNING

DEVICE

VOLTAGE

REGULATOR

Power primary ground
Secondary ground (isolated from mains)

Muting
Control

Remote

Stand-by

Remote

Stand-by

µ P

V

CC

INFRA-RED
RECEIVER

2261-02.EPS

MAINS
INPUT

P : Output voltage adjustement

2/9

R

C

V

CC

TEA2260/61

AUDIO

OUTPUT

STAGE

P

SCANNING

DEVICE

VOLTAGE

REGULATOR

Power primary ground
Secondary ground (isolated from mains)

Muting
Control

Remote

Stand-by

µ P

V

CC

INFRA-RED
RECEIVER

2261-03.EPS

BLOCK DIAG RAM

TEA2260 - TEA2261

SV

7 16 15

ERROR AMPLIFLIER

6

E

T (60%)

ON(Max.)

SOFT-START

-

+

V

REF

2.49V

- 1

-

+

MODULATORS

+

-

CC

100

MODULATOR

LOGIC

AUTOMATIC

BURST

GENERATION

DEMAGNETIZATION

OSCILLATOR

SENSING

R

ABSOLUTE MAXIMUM RATINGS

INTERNAL

BIAS

V (2.49V)

REF

PRIMARY

PULSES

LOGIC

-

0.15V

V MONITORING

CC

7.4V 10.3V

REGULATION

PULSES

IS

+

SECONDARY

PULSE

IN

IS

CC

OVERVOLTAGE

PROTECTION

PROCESSOR

REPETITIVE
OVERLOAD

PROTECTION

45µ A

10µ A

15.7V

-

LOGIC

+

-

2.55V

C

2

+

POSITIVE

OUTPUT

STAGE

V

CC

NEGATIVE

OUTPUT

STAGE

CURRENT

LIMITATION

-

0.6V

+

+

-

0.9V

I

MAX

V +

GND

+ 1.2A
(Max.)

- 2A

(Max.)

14

OUT

131254381211 109

2261-04.EPS

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

+ Positive Output Current (source current) 1.5 A

I

OUT

- Negative Output Current (sink current) 2.5 A

I

OUT

T

T

stg

Operating Junction Temperature 150

j

Storage Temperature Range -40, +150

THERMAL D ATA

R

th (j-c)

R

th (j-a)

* Soldered on a 35µm, 40cm2 board copper area.

Junction-case Thermal Resistance 11
Junction-ambient Thermal Resistance 45

MAXIMUM POWER DISSIPATION

P (W)

tot

4

3

o

2

1

45 C/W

o

T ( C)

AMB

o

C/W

o

C/W

o

C

o

C

2261-01.TBL

2261-02.TBL

50 100 1500

2261-05.EPS

3/9

TEA2260 - TEA2261

RECOMMENDE D OPE R ATING CON DITIONS

Symbol Parameter Min. Typ. Max. Unit

V

CC

I

OUT

I

OUT

I

OUT

I

OUT

F

oper

V

IN

R

OSC

C

OSC

C1 Soft-starting Capacitor Range 0.047 1 µF
C2 Overload Integration Capacitor 0.047 1 µF

C2/C1 Ratio C2/C1 (C2 must be ≥ C1) 1

T

amb

Power Supply V

stop 12 V

CC

max V

CC

+ Positive Output Current (source current) 1.2 A

- Negative Output Current (sink current) 2.0 A

+ Average Positive Output Current 0.6 A

- Average Negative Output Current 0.6 A
Operating Frequency 10 100 kHz
Input Pulses Amplitude (Pin 2) 1.5 2.5 4.5 V
Oscillator Resistor Range 20 150 kΩ
Oscillator Capacitor Range 0.47 4.7 nF

Operating Ambient Temperature -20 70

o

C

2261-03.TBL

ELECTRICAL CHARACTERISTICS (T

= 25oC, VCC =12V, unless otherwise specified)

amb

Symbol Parameter Min. Typ. Max. Unit

POWER SUPPLY

V

CC(start)

V

CC(stop)

Hyst V

I

CC(start)

I

CC

V

CC(max)

I

CC(over)

Starting Voltage (VCC increasing) 9.3 10.3 11.3 V
Stopping Voltage (VCC decreasing) 6.4 7.4 8.4 V

CC

Hysteresis (V

CC(start)

- V

) 2.4 2.9 V

CC(Stop)

Starting Current (VCC = 9V) 0.7 1.4 mA
Supply Current (VCC = 12V) 7.5 15 mA
Overvoltage Threshold on V

CC

15 15.7 V

Supply Current after Overvoltage Detection (VCC = 17V) 26 35 42 mA

OSCILLATOR / PWM SECTION

Delta F

F

max Maximum Duty Cycle in Primary Regulation Mode 50 60 70 %

t

ON

Accuracy (R

= 68kΩ, C

OSC

= 1nF) 10 %

OSC

ERROR AMPLIFIER SECTION

A

VO

F

ug

I

SC

I

BE

V

REF

Open Loop Gain 75 dB
Unity Gain Frequency 550 kHz
Short Circuit Output Current (Pin 7 connected to ground) 2 mA
E Input Bias Current (Pin 6) 0.08 µA
Internal Voltage Reference (connected to error amplifier input and

2.34 2.49 2.64 V

not directly accessible)

INPUT SECTION

V

IN

V

IS

I

BIN

I

BIS

IN Input Threshold (Pin 2) 0.6 0.85 1.2 V
IS Input Threshold (Pin 1) 0.15 V
IN Input Bias Current 0.3 µA
IS Input Bias Current 0.4 µA

CURRENT LIMITATION SECTION

V

IM1

V

IM2

∆V

V

C2

I

DC2

I

CC2

I

BI(max)

First Current Limitation Threshold 558 600 642 mV
Second Current Limitation Threshold 837 900 963 mV
Thresholds Difference V

IM

IM2

- V

IM1

300 mV
Lock-out Threshold on Pin C2 2.25 2.55 2.85 V
Capacitor C2 Discharge Current 10 µA
Capacitor C2 Charge Current 45 µA
Maximum Input Bias Current (Pin 3) 0.2 µA

2261-04.TBL

4/9

TEA2260 - TEA2261

GENERAL DES CRI PTI O N

The TEA2260/61 is an off-line swit ch 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 TEA2260/61 can be used in two types of
architectur es :

- Master/slave architecture. In this case, the
TEA2260/61 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 1).

- Conventional architecture with linear feedback
signal (feedback sources : optocoupler or trans­former winding) (see Figure 2).

Using the TEA2260/61, the stand-by auxiliary
power supply , often realized with a s mall but costly
50Hz transformer, is no longer necessary. The
burst mode operation of the TEA2260/61 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
TEA2260/61 and also the power transist or turn-of f
can be easily synchronized with the line trans­former. The switching noise cannot disturb the
picture in this case.

As an S.M.P .S. contro ller , the TEA2260/61 features
the following functions :

- Power supply start-up (with soft -s tart )

- PWM generator

- Direct power transist or drive (+1.2A , -2. 0A)

- Safety functions : pulse by pulse current limita­tion, output power limitat ion, 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 V

of the TEA2260/61 is below VCC start,

CC

the quiescent current is very low (typically 0.7mA)
and the electrolytic c apacitor across V
charged. When V

reaches VCC start (typically

CC

is linearly

CC

10.3V), 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 percen­tage of the nominal output voltage (eg. 80%).
For this the TEA2260/61 contains all the functions
required for primary mode regulation : a fixed fre­quency oscillator, a voltage reference, an error
amplifier and a pulse width modulator (PWM).
For transmission of low power with a good effi­ciency in stand-by, an automatic burst generation

system is used, in order to avoid audible noise.

Normal Mode (secon dary regu lat ion)

The normal operating of the TV set is obtained by
sending to the TEA2260/61 regulation pulses gen­erated by a regulator located in the secondary side
of the power supply.
This architectur e uses the "Mas ter-slave Conc ept",
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 c a n
be ordonnered for exemple by a mic roprocessor in
relation with the remote control unit.
Regulation pulses are applied to the TEA2260/61
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 secon­dary regulator can be lower or higher than the
frequency of the starting oscillator .
The TEA2260/61 has no soft-star ting system when
it receives pulses from the secondary. The soft­starting has to be located in the secondary regula­tor.
Due to the principle of the primary regulation,
pulses generated by the starting system automat­ically disappear when the voltage delivered by the
SMPS increases.

Stand-by Mo de - Normal Mo d e T ran si tio n

During the transition there are simultaneously
pulses coming from the primary and secondary
regulators.
These signals are not synchronized and some c are
has to be taken to ensure the safety of the switching
power transistor.

A very sure and simple w ay consist in check ing the
transformer demagnetization stat e.

- A primary pulse is taken in account only if the
transformer is demagnetized after a conduction
of the power transistor required by the secondary
regulator.

- A secondary pulse is taken in account only if the
transformer is demagnetized after a conduction
of the power transistor required by the primary
regulator.

With this arrangement the switching safet y area of
the power transistor is respected and there is no
risk of transformer magnetization.
The magnetization state of the transformer is
checked by sensing the voltage across a winding
of the transformer (generally the same which sup­plies the TEA2261). This is made by connecting a
resistor between this winding and the demagneti­zation sensing input of the circuit (Pin 1).

5/9

TEA2260 - TEA2261

SECURITY F UNCT IONS OF THE TE A2260 (see flow-chart below)

- Undervoltage detection. This protection works
in association with the starting device "V

CC

switch" (see paragraph Starting-mode - standby
mode). If V

is lower than VCCstop (typically

CC

7.4V) output pulses are inhibited, in order t o avoid
wrong operation of the power supply or bad
power transistor drive.

- Overvoltage det ection. If V

exceeds VCCmax

CC

(typically 15.7V) output pulses are inhibited. Re­starting of the power supply is obtained by reduc­ing V

below VCCstop.

CC

- Curren t limitatio n of the power transisto r . The
current is measured by a s hunt resist or . A double
threshold system is used :

- When the first threshold (V

) is reached, the

IM1

conduction of the power transistor is stopped
until the end of the period : a new conduction
signal is needed to obtain conduction again.

- Furthermore as long as the first threshold is

reached (it means during several periods), an
external capacitor C
voltage across the capacitor r eaches V

is charged. When the

2

(typi-

C2

cally 2.55V) the output is inhibited. This is called
the "repetitive overload protection". If the over­load diseappears before V
discharged, so transient overloads are toler­ated.

- Second current limitation threshold (V
When this threshold is reached the output of the
circuit is immediatly inhibited. This protection is
helpfull in case of hard overload for example to
avoid the magnetizati on of the transformer.

- Restart of the power supply. After stopping due
to V

, V

C2

start of the power supply can be obtained by the
normal operating of the "V
to an integrted counter, if normal restart cannot
be obtained after three trials, the circuit is defini­tively stopped. In this case it is necessary to
reduce V
circuit. From a practical point of view, it means
that the power supply has to be temporarily dis­connected from any power source to get the
restart.

is reached, C2 is

C2

, VCCMax or VCCstop triggering, re-

IM2

switch" but thanks

CC

below approximately 5V to reset the

CC

IM2

).

SECURITY FLOW -CHAR T (TEA2260)

S.M.P.S.

threshold reached

V max
reached

Normal operating

C discharged

2

starting

First

VIM1

CC

Y

N

N

Y

Y

Second

threshold reached

VIM2

N

Pulse by pulse current

limiting C charged

2

V < 2.6V

C2

N

S.M.P.S. stopping

V stop reached

CC

N = N + 1

Restart

number = 3

Y

N

6/9

Reset C

discharged

Y

Y

2

N

Definitive

stopping

2261-06.EPS

SECURITY F UNCT IONS OF THE TE A2261 (see flow-chart below)

- Undervoltage detection. This protection works
in association with the starting device "V

CC

switch" (see paragraph Starting-mode - standby
mode). If V

is lower than VCCstop (typically

CC

7.4V) output pulses are inhibited, in order t o avoid
wrong operation of the power supply or bad
power transistor drive.

- Overvoltage det ection. If V

exceeds VCCmax

CC

(typically 15.7V) output pulses are inhibited and
the external capacitor C
V

is higher than VCC stop. Restarting of the

CC

power supply is obtained by reducing V
V

stop except if the voltage across C2 reaches

CC

V

(typically 2.55V) (refer to "Restart of the

C2

is charged as long as

2

below

CC

power supply" paragraph).In this last case, the
circuit is definitively stopped.

- Curren t limitation of the power transisto r . The
current is measured by a s hunt resist or . A double
threshold system is used :

- When the first threshold (V

) is reached, the

IM1

conduction of the power transistor is stopped
until the end of the period : a new conduction
signal is needed to obtain conduction again.

- Furthermore as long as the first threshold is

reached (it means during several periods), an

external capacitor C
voltage across the capac itor reaches V
cally 2.55V) the output is inhibited. This is called
the "repetitive overload protection". If the over­load diseappears before V
discharged, so transient overloads are toler­ated.

- Second current limitation threshold (V
When this threshold is reached the output of the
circuit is immediatly inhibited. This protection is
helpfull in case of hard overload for example to
avoid the magnetizati on of the transformer.

- Restart of the power supply. After stopping due
to V

, VCCMax or VCCstop triggering, restart of

IM2

the power supply can be obtained by the normal
operating of the "V
quency from V
due to V

C2

finitively stopped. In this case it is necessary to
reduce V
circuit. From a practical point of view, it means
that the power supply has to be temporarily dis­connected from any power source to get the
restart.

TEA2260 - TEA2261

is charged. When the

2

(typi-

C2

is reached, C2 is

C2

switch" VCC switch se-

CC

stop to VCCstart . After stopping

CC

threshold reaching, the circuit is de-

below approximately 5V to reset the

CC

IM2

).

SECURITY FLOW -CHAR T (TEA2261)

S.M.P.S.

starting

First

threshold reached

VIM1

N

V max

CC

reached

N

Normal operating

C discharged

2

Y

Second

threshold reached

VIM2

Y

Y

C charged

2

S.M.P.S. stopped

V < 2.6V

C2

N

Definitive

stopping

N

Pulse by pulse current

limiting C charged

2

V < 2.6V

C2

Y

N

Y

Reset C

discharged

Y

2

N

2261-07.EPS

7/9

TEA2260 - TEA2261

TYPICAL APPLICATION (Master/slavearchit ect ure)

170 VAC
270 VAC

Ω

1k

P

3.3
nF

Ω

22k

7 6 4 5 12 13 16 15

2

1nF

Ω

1k

TEA2260/61

11

2

10

1nF

330

nF

Ω

82k

Small signal secondary ground
Power primary ground
Secondary ground (isolated from mains)

4.7k

9

4 x 1N4007 BY218-600

2.2µ H

18

Ω

22k
3W

39

2.2 /0.5W

Ω

330µ F

25V

22k

Ω

Ω

Ω

BZX85-3V0

1N4148

BA157

47µ F

SGSF

100pF

Ω

2.2µ F
16V

8

3

330

nF

0.135 /1W

1nF

330 Ω

Ω

150µ F

385V

14 1

Ω

10
1W

P : 140W

OUT

f : 32kHz

313

PLR811

62019

220
16W

14

BY218-100

22

BY218-100

21

Ω

270

9

717

344

BY299

Ω

2.7nF

100

1kV

1k

10µ F

16V

ΩΩ

TV - SET SMPS (with TEA5170)
Input voltage range 170VA C – 270V A C

Input DC voltage range 210VDC – 370VDC
Output power in normal mode 25W < P
Output power in stand by mode 2W < P

< 140W

O

< 45W

O

Operating frequency 32 kHz
Efficiency at full load > 80%
Efficiency in stand by mode > 50%
Short circuit protected
Open load protected
Long duration overload protected
Complete shutdown after repetit ive default detec tion

470µ F

25V

1000µ F

25V

1000µ F

25V

12V

100µ F

0.5A

250V

BC547C

25V

1A

1.2nF

2465

TEA5170

560

pF

2%

100k
1%

Ω2.2k

10k

75

Ω

k

1N4148

135V

0.8A

P

1

Ω

47k

Ω

120k

7.5V

6.8k

150pF

1A

Stand-by

control

Sync.

input

ΩΩ

2261-08.EPS

Ω

1873

47nF

Load regulation (VDC = 310V)
Output 135V (± 0.18%) → (I

Output 25V (± 2%) → (I

: 0.01A to 0.8A ; I25 = 1A)

135

: 0.8A ; I25 : 0.5A ––> 1A)

135

Line regulation
Output 135V (± 0.13%) → (210V < V

Output 25V (± 0.17%) → (I

8/9

: 0.8A ; I25 : 1A)

135

< 370V)

DC

PACKAGE MECHANICAL DATA

16 PINS - PLASTIC DIP

TEA2260 - TEA2261

a1

Z

b

B

e

e3

I

L

b1

E

D

16

9

F

18

Dimensions

Min. Typ. Max. Min. Typ. Max.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065
b 0.5 0.020

b1 0.25 0.010

D 20 0.787
E 8.5 0.335
e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

i 5.1 0.201
L 3.3 0.130
Z 1.27 0.050

Millimeters Inches

PM-DIP16.EPS

DIP16.TBL

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwi se under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously suppli ed. SGS-THOMSON Microele ctronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

© 1994 SGS-THOMSON Microelectronics - All Rights Reserved

2

Purchase of I

2

C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to

I

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The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips

2

C Standard Specifications as defined by Philips.

the I

SGS-THOMSON Microelectronics G ROUP OF COMPANIES

9/9