TEA2019

CURRENT MODE SWITCHING

POWER SUPPLY CONTROL CIRCUIT

August 1992

.

DIRECT

DRIVE

OF

THE

EXTERNAL

SWITCHING TRANSISTOR

.

POSITIVE AND NEGATIVE OUTPUT CUR-

RENTS UP TO 0.5A

.

CURRENT LIMITATION

.

TRANSFORMER DEMAGNETIZATION AND

POWER TRANSISTOR SATURATION SENS-

ING

.

FULL OVERLOAD AND SHORT-CIRCUIT

PROTECTION

.

PROPORTIONAL BASE CURRENT DRIVING

.

LOW STANDBY CURRENT BEFORE START-

ING (1.6mA)

.

SYNCHRONIZATION CAPABILITY WITH IN-

TERNAL PLL

.

THERMAL PROTECTION

DIP 14

(Plastic package)

ORDER CODE : TEA2019

DESCRIPTION

The TEA2019 is an 14-pin DIP low cost integrated

circuit designed for the control of switch mode

power supplies. It has the same basic functions as

the TEA2018A but with synchronization capability

by internal PLL. It is particularly suitable for appli-

cations where oscillator synchronization is re-

quired.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUTPUT

AUXILIARY OUTPUT SUPPLY

POSITIVE SUPPLY VOLTAGE

SATURATION SENSING

DEMAGNETIZATION SENSING

ERROR AMPLIFIER NON-INVERTING INPUT

SYNCHRONIZATION INPUT

NEGATIVE SUPPLY (OUTPUT STAGE)

SUBSTRATE

I

SAMPLE (NEGATIVE)

GROUND

OSCILLATOR CAPACITOR

OSCILLATOR REFERENCE CURRENT

C

PLL OUTPUT

PIN CONNECTIONS

Due to its current mode regulation, the TEA2019

facilitates design of power supplies with following

features :

.

High stability regulation loop.

.

Automatic input voltage feed-forward in dis-

continuous mode fly-back.

.

Automatic pulse-by-pulse current limitation.

Typical applications : Video Display Units, TV sets,

typewriters, micro-computers and industrial appli-

cations. For more details, see application

note AN406/0591.

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