SGS Thomson Microelectronics TEA2019 Datasheet

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

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