November 1993

2

Philips Semiconductors

Product specification

Control circuit for switched mode power supplies

TDA8380A

GENERAL DESCRIPTION

The TDA8380A is an integrated circuit intended for use as a control circuit in low-cost switched mode power supplies for

television, monitors and small industrial equipment. The TDA8380A operates using duty factor regulation in the fixed

frequency mode.

Features

• A low-current initialization circuit (maximum 150 µA) which can be switched off

• A bandgap reference generator

• Circuitry for slow-start combined with an accurate setting of the maximum duty factor (D

• Programmable low supply voltage protection with one default value

• High supply protection circuitry

• Error amplifier with a transfer characteristic generator (TCG)

• Protection against open- and short-circuited feedback loop

• An overload voltage foldback

• Primary current protection circuitry for both cycle-by-cycle and trip mode

• Protection against transformer saturation

• A direct drive output stage (sink current 2.5 A, source current 0.75 A)

• Anti-double pulse logic

• Protected against damage as a result of a short-circuited high-voltage transistor

• RC oscillator with synchronization input

QUICK REFERENCE DATA

PACKAGE OUTLINE

16-lead DIL; plastic (SOT38); SOT38-1 ; 1996 November 18.

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

Supply voltage

−

14

−

V

Supply current

−−

15

mA

Output pulse repetition frequency range

10

−

100

kHz

Operating ambient temperature range

−25

−+ 70

°C