TEA1039 - Control circuit for switched-mode power supply

GENERAL DESCRIPTION

The TEA1039 is a bipolar integrated circuit intended for the control of a switched-mode power supply. Together with an

external error amplifier and a voltage regulator (e.g. a regulator diode) it forms a complete control system. The circuit is

capable of directly driving the SMPS power transistor in small SMPS systems.

It has the following features:

• Suited for frequency and duty factor regulation.

• Suited for flyback converters and forward converters.

• Wide frequency range.

• Adjustable input sensitivity.

• Adjustable minimum frequency or maximum duty factor limit.

• Adjustable overcurrent protection limit.

• Supply voltage out-of-range protection.

• Slow-start facility. 

FUNCTIONAL DESCRIPTION

The TEA1039 produces pulses to drive the transistor in a

switched-mode power supply. These pulses may be varied

either in frequency (frequency regulation mode) or in width

(duty factor regulation mode).

The usual arrangement is such that the transistor in the

SMPS is ON when the output of the TEA1039 is HIGH, i.e.

when the open-collector output transistor is OFF. The duty

factor of the SMPS is the time that the output of the

TEA1039 is HIGH divided by the pulse repetition time.

Supply VCC (pin 9)

The circuit is usually supplied from the SMPS that it

regulates. It may be supplied either from its primary d.c.

voltage or from its output voltage. In the latter case an

auxiliary starting supply is necessary.

The circuit has an internal VCC out-of-range protection. In

the frequency regulation mode the oscillator is stopped; in

the duty factor regulation mode the duty factor is made

zero. When the supply voltage returns within its range, the

circuit is started with the slow-start procedure.

When the circuit is supplied from the SMPS itself, the

out-of-range protection also provides an effective

protection against any interruption in the feedback loop.

Mode input M (pin 6)

The circuit works in the frequency regulation mode when

the mode input M is connected to ground (VEE, pin 7). In

this mode the circuit produces output pulses of a constant

width but with a variable pulse repetition time.

The circuit works in the duty factor regulation mode when

the mode input M is left open. In this mode the circuit

produces output pulses with a variable width but with a

constant pulse repetition time.

Oscillator resistor and capacitor connections RX and

CX (pins 4 and 5)

The output pulse repetition frequency is set by an oscillator

whose frequency is determined by an external capacitor

C5 connected between the CX connection (pin 5) and

ground (VEE, pin 7), and an external resistor R4 connected

between the RX connection (pin 4) and ground. The

capacitor C5 is charged by an internal current source,

whose current level is determined by the resistor R4. In the

frequency regulation mode these two external

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