Datasheet TEA2019 Datasheet (SGS Thomson Microelectronics)

POWER SUPPLY CONTROLCIRCUIT

.

DIRECT DRIVE OF THE EXTERNAL
SWITCHING TRANSISTOR

.

POSITIVE AND NEGATIVE OUTPUT CUR­RENTSUP TO0.5A

.

CURRENT LIMITATION

.

TRANSFORMER DEMAGNETIZATION AND
POWER TRANSISTOR SATURATION SENS­ING

.

FULL OVERLOAD AND SHORT-CIRCUIT
PROTECTION

.

PROPORTIONALBASECURRENT DRIVING

.

LOW STANDBY CURRENT BEFORE START­ING (1.6mA)

.

SYNCHRONIZATION CAPABILITY WITH IN­TERNAL PLL

.

THERMAL PROTECTION

TEA2019

CURRENTMODE SWITCHING

Due to its current mode regulation, the TEA2019
facilitates design of power supplies with following
features:

.

High stability regulationloop.

.

Automatic input voltage feed-forward in dis­continuousmode fly-back.

.

Automaticpulse-by-pulsecurrentlimitation.
Typical applications: VideoDisplayUnits, TV sets,
typewriters, micro-computers and industrial appli­cations. For more details, see application
noteAN406/0591.

DESCRIPTION

The TEA2019isan 14-pinDIP low costintegrated
circuit designed for the control of switch mode
power supplies. Ithasthe same basic functionsas
the TEA2018Abut with synchronization capability
by internal PLL. It is particularly suitable for appli­cations where oscillator synchronization is re­quired.

PINCONNECTIONS

OUTPUT

AUXILIARY OUTPUT SUPPLY

POSITIVE SUPPLY VOLTAGE

SATURATION SENSING

DEMAGNETIZATION SENSING

ERROR AMPLIFIER NON-INVERTING INPUT

SYNCHRONIZATION INPUT

1
2
3
4
5
6
7

DIP 14

(Plastic package)

ORDER CODE :TEA2019

14
13
12
11
10

NEGATIVE SUPPLY (OUTPUTSTAGE)
SUBSTRATE
I SAMPLE (NEGATIVE)

C

GROUND
OSCILLATOR CAPACITOR
OSCILLATOR REFERENCE CURRENT

9
8

PLL OUTPUT

2019-01.EPS

August 1992

1/7

TEA2019

BLOCK DIAGRAM

23

AUX

V

= 2.4V

REF

V

Undervoltage

C

I

RECOPY

Output
1

200ms

DELAY

1

14

Substrate VI

Q

CC

V

S

5

I

01.V

SWITCH

CC

V

”good”

CC

V

PHASE

LOCKED

8

PLL Out

Bias

Sensing

Demagnetization

Pulse

Sampling

LOOP

7

Sync.

S

&

OSCILLATOR

V

9
Rt

CC

FLIP

10
Ct

FLOP

80%

Q

R

&

1

LIMITATION

DUTY CYCLE

r

o

t

a

THERMAL

SHUT-DOWN

r

a

p

m

o

3.2V

C

x50

6

Feed-back

-1V
VOLTAGE

LIMITATION

V

REF

4

CE

11 13

Ground MonitoringV

12

SENSE

TEA2019

2019-02.EPS

ABSOLUTEMAXIMUM RATINGS

Symbol Parameter Value Unit

+

V

CC

V

(aux)
–

V

CC

I

(peak) Peak Output Current (duty cycle < 5%) ± 1A

O

I

I

T

T

oper

T

stg

2/7

Positive Supply Voltage 15 V
Auxiliary Output Supply Voltage 15 V
Negative Supply Voltage – 5 V

Input Current Pins 4-5 ± 5mA
Junction Temperature 150 °C

j

Operating Ambient Temperature Range – 20, + 70 °C
Storage Temperature Range – 40, + 150 °C

2019-01.TBL

TEA2019

THERMALDATA

Symbol Parameter Value Unit

R

th (j-a)

ELECTRICALOPERATING CHARACTERISTICS

=+25oC, potentialsreferenced to ground(unless otherwise specified)

T

amb

Symbol Parameter Min. Typ. Max. Unit

+

V

CC

V

CC

V

CC(start)

V

CC(stop)

+

∆ V

CC

I

CC(sb)

V

th (Ic)

R

(Ic)

I

S

τ

max

A

V

+

I

I

V

(REF)

∆V

(REF)

∆T

T

OSC

∆f

OSC

∆T

∆f

OSC

∆V

CC

t

on(min)

Junction-ambient Thermal Resistance 80 °C/W

Positive Supply Voltage 6.6 8 15 V
Negative Supply Voltage –1 –3 –5 V
Minimum positive supply voltage required for starting (V
Minimum positive voltage below which device stops operating (V
Hysteresis on V
Standby Supply Current Before Starting [V

+

Threshold 0.7 1.1 1.6 V

CC

+

<V

CC

+

rising) 6 6.6 V

CC

] 1 1.6 mA

CC(start)

+

falling) 4.2 4.9 5.6 V

CC

Current Limitation Threshold Voltage (pin 12) –1100 –1000 –880 mV
Collector Current Sensing Input Resistance 1000 Ω
Demagnetization Sensing Threshold 75 100 125 mV
Demagnetization Sensing Input Current (pin 5 grounded) 1 µA
Maximum Duty Cycle 70 80 %
Error Amplifier Gain 50
Error Amplifier Input Current (non-inverting input) (pin 6) 2 µA
Internal Reference Voltage 2.3 2.4 2.5 V

Reference Voltage Temperature Drift 10

–4

Oscillator Free-running Period ( R = 59kΩ, C = 1.5nF) 60 65 70 µs
Oscillator Frequency Drift with Temperature (V

Oscillator Frequency Drift with V

+

CC

(+ 8V < V

+

= + 8V) 0.05 %/°C

CC

+

< + 14V) 0.5 %/V

CC

Minimum Conducting Time (Ct= 1nF) 2 µs

2019-02.TBL

V/°C

2019-03.TBL

SYNCHRONIZATION INPUT (pin 7)

Symbol Parameter Min. Typ. Max. Unit

V

R

Peak to Peak Sawtooth Voltage 0.5 2.5 V

7pp

Input Impedance 20 kΩ

(7)

PLL CHARACTERISTICS (see Test Circuit)

Symbol Parameter Min. Typ. Max. Unit

Frequency Sensitivity 100 Hz/µA

∆T Capture Range (T

T

SYN max-TOSC

=64µsTyp.) T

OSC

OSC-TSYN min

5.5

4.5

8
8

SATURATION SENSING(pin 4)

Symbol Parameter Min. Typ. Max. Unit

V

I

Input Threshold 3.2 V

(4)

Input Current (V4> 3.2V) 50 µA

(4)

Input Internal Resistance 1 kΩ

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min. Typ. Max. Unit

+

V

V

F

Positive Supply Voltage 8 V

CC

Negative Supply Voltage 3 V

CC

Output Current 0.5 A

I

O

Operating Frequency 30 kHz

oper

µs
µs

2019-04.TBL

2019-05.TBL

2019-06.TBL

2019-07.TBL

3/7

TEA2019

TYPICALCIRCUIT

V66V5

10kΩ

10nF

22nF

5

8 9 10 11 12 13 14

56kΩ

3.3nF

59kΩ

1%

1.5nF

V10

AS1

8.2kΩ

10nF

22nF

3.9kΩ

GENERALDESCRIPTION

(see applicationnote AN406/0591)
OperatingPrinciples (Figure 1)

On every period, the beginning of the conduction
time of the transistor is triggered by the fall of the
oscillatorsaw-toothwhich acts as clocksignal.The
periodT
T

osc

(T

osc

isgiven by :

osc

≈ 0.69 Ct(Rt+2000)

in seconds,Ctin Farad, Rtin Ω)

The end of the conduction time is determinedby a
signalissuedfromcomparingthefollowingsignals.
a) the s awtooth waveform representing the

collector current of the switching transistor,
sampledacross the emitter shunt resistor.

b) the output of the erroramplifier.

V3

470

22nF

4.7µF

31427

Ω

TEA2019

100Ω

47nF

V12 V14

Figure1 : Current ModeControl

FLIP-FLOP

S

R

COMPARATOR

V

REF

ERROR
AMPLIFIER

ERROR

SIGNAL

OSCILLATOR

I SENSE

C

10

Ω

RAMP

GENERATOR

IC

0V

-1V

4.7µF

2019-03.EPS

V

i

OUTPUT

FILTER

I

C

Q

Re

LOAD

Base Drive

• Fast turn-on
On each period, a current pulse ensures fast
transistorswitch-on.
This pulse performs also the t

on(min)

functionat

the beginningof the conduction.

• Proportionalbase drive
In order to save power, the positivebase current
after the starting pulse becomes an image of the
collectorcurrent.

I

C

The ratio

4/7

is programmed as follows(Figure 2).

I

B

I

R

C

B

=

I

R

B

E

OSCILLATOR
SAWTOOTH

I (sample)

C

FLIP-FLOP
OUTPUT

t

Error
Signal

t

t

2019-05.EPS / 2019-04.EPS

TEA2019

• Efficientand fast switch-off
When the positive base drive is removed, 1s
(typically) will elapse before the application of
negative current therefore allowing a safe and
rapid collector current fall.

Safety Functions

• Overload & short-circuitprotection
When the voltage applied to pin 12 exceeds the
current limitation thershold voltage [V

th(Ic)

outputflip-flopis reset andthetransistoristurned
off.
The shunt resistor R

must be calculated so as

e

to obtain the current limitation threshold on pin
12 at the maximum allowable collectorcurrent.

Figure2

R

B

TEA2019

12

1

I

B

R

e

], the

I

C

• Demagnetizationsensing
This function disablesany new conduction cycle
of the transistoras long as the core is not com­pletelydemagnetized.
Whennot used, pin 5 mustbe grounded.

• t

on(max)

Outside the regulation area and in the absence
of current limitation, the maximum conduction
time is set at about 70% of theperiod.

• t

on(min)

A minimum conducting time is ensured during
each period (see Figure 2).

• Supply voltage monitoring
TheTEA2019willstopoperatingifVCC+onPin3
fallsbelow the thresholdlevel V

I

C

0

I

B

t

on(min)

0

COLLECTOR
CURRENT

BIAS
CURRENT

I

B

CC(stop)

t

R

B

I

C

R

e

t

.

I

C

StartingProcess (Figure 3)
Prior to starting, a low current is drawn from the

high voltage source through a high value resistor.
This current charges the power supply storage
capacitorof the device.
No output pulses are available before the voltage
on pin 3 hasreachedthe threshold level [V

+

rising].

V

CC

CC(start)

During this time the TEA2019 draws only 1mA
(typically). When the voltage on pin 3 reaches this
thresholdbase drive pulses appear.
The energy drawn by these pulses tends to dis­charge the power supply storage capacitor. How­ever a hysteresisof about 1.1V (typically)(∆ V

CC

isimplemented to avoid the device from stopping.

Figure3 : Normal TEA2019 Start up Sequence

V

CC

V

CC (start)

,

6V

4.9V

V

CC

V

CC (stop)

)

t

5/7

2019-06.EPS

2019-07.EPS

TEA2019

The TEA2019 has some additional capabilities
comparedto the TEA2018A:

• The oscillatorchargecurrentits suppliedthrough
aninternalcurrentgenerator,programmedexter­nally - instead of using an external charging
resistor. The sawtooth so obtainedis linear.

• The oscillator can be synchronized through an
internal PLL circuit. This feature provides syn­chronization between the external sync pulse
and the end of the switching transistor current.
The sync pulse can be for example the fly-back
pulse of a TV horizontal sweep circuit. As indi­cated in the application diagram, this pulse is
applied first to a R.C. network to obtain a low
voltagesawtooth and then to pin 7 of the circuit.
The PLL output (pin 8) supplies a correction
current to pin 9 through an external resistor,so
as to maintain the oscillator at the correct fre­quency(referto applicationnoteAN406/0591for
detailedinformation).

• In theTEA2019,the powersupply ofthepositive
output stage is separated from the main power
supply, so that it can be supplied from a lower

TYPICALAPPLICATION

voltagein orderto reducetheI.C. powerdissipa­tion.
For low power applications, the circuit can be
normally supplied by connecting pins 2 and 3
together.

• In order to protectthesubstrate(pin13)from the
parasitic voltage peaks produced by negative
output current peaks at pin 14, the substrate
(pin 13) is internally separatedfrom the negative
supply (pin 14). They must be externally con­nectedtogether.

• The switching transistor saturation voltage can
be monitored at pin 4. To achieve this, a high
voltage diode must be connected between the
collector of the switching transistor and pin 4.
Also a resistor must be connectedfrom pin 4 to

+

(see application diagram). This arrange-

V

CC

ment is useful when the chosen value of base
current is very low and as a consequence the
saturationvoltagewillbehigh.In thisevent,when
V

increases above 2.5V,the base current

CE(sat)

isinterruptedbeforethenormalendof theperiod.
Remark: the TEA2019can also operate without
this protection.

4 x 1N4007

0.1

µF

RF Filter

2 x 12mH

µF

0.1

0.5A

Mains

Input

.

P

=60W

MAX

.

Free-runningFrequency : 15kHz

.

155V

≤ VAC≤ 250V

RMS

47µF
385V

82kΩ

47nF

C2

33nF

3.9kΩ

Sync.
Pulse

RMS

10kΩ

1.8kΩ

7

8

3.3nF

1N4148

18

µF

10

10k

Ω

65

TEA2019

910

56k

Ω56kΩ

1.5nF

22nF

Ω

10kΩ

4113

1N41483.9

Ω

120k

470µF

10

Ω

21

12

13 14

4.7Ω

.

Outputs: 120V ± 3%,0.4A

Ω

1W

BYT11-100

3 x 1N4001

3.3

100

10µF

BYT

11-100

Ω

BUV
46A

Ω

24V ±3%, 0.5A

.

VCEMonitoring

n3

Ω

1k

3W

BYT11-1000

0.47Ω

n0

2.2nF

680
3W

Ω

BYT11-800

100

F

µ

160V

n1

BYT11-800

n2

Primary Ground
SecondaryGround

470
40V

120V

0.4A

24V

0.5A

µF

2019-08.EPS

6/7

PACKAGE MECHANICALDATA

14 PINS- PLASTICDIP

I

a1

TEA2019

b1

E

Dimensions

L

Z

b

14 8

17

Be

e3

D

Z

F

Millimeters Inches

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

a1 0.51 0.020

B 1.39 1.65 0.055 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 15.24 0.600

F 7.1 0.280

i 5.1 0.201

L 3.3 0.130

Z 1.27 2.54 0.050 0.100

PM-DIP14.EPS

DIP14.TBL

Information furnishedis believed to be accurateand reliable. However, SGS-THOMSON Microelectronicsassumes no responsibility
for the consequences of use of such information nor for any infringement of patents or other rights of third partieswhich may result
from its use. Nolicence is granted by implication or otherwise 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 previouslysupplied. SGS-THOMSON Microelectronics 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

Purchase of I

2

I

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

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7/7