TEA5170

SWITCH MODE POWER SUPPLY SECONDARY CIRCUIT

September 1993

1

2

3

4

8

7

6

5

SOFT-START CAPACITOR

SUPPLY VOLTAGE

POWER OUTPUT

GROUND

OSCILLATOR RESISTOR

OSCILLATOR CAPACITOR

VOLTAGE ERROR AMPLIFIER OUTPUT

VOLTAGE ERROR AMPLIFIER

INVERTING INPUT

RT

CT

E

E

OUT

OUT

P

CC

V

CSF

GND

PIN CONNECTIONS

DIP8

(Plastic Package)

ORDER CODE : TEA5170

.

INTERNAL PWM SIGNAL GENERATOR

.

POWER SUPPLY WIDE RANGE 4.5V – 14.5V

.

SOFT START

.

REFERENCE VOLTAGE 2V

± 5%

.

WIDE FREQUENCY RANGE 250kHz

.

MINIMUM OUTPUT PULSE WIDTH 500nS

.

MAXIMUM PRESET DUTY CYCLE

.

SYNCHRONIZATION WINDOW

.

OUTPUT SWITCH

.

UNDERVOLTAGE LOCKOUT

.

FREQUENCY RANGE WITH SYNCHRONIZA-

TION 64kHz

DESCRIPTION

The TEA5170 is designed to work in the secondary

part of an off-line SMPS, sending pulses to the

slaved TEA2260/61 which are located on the pri-

mary side of the main transformer. An accurate

regulated voltage is obtained by duty cycle control.

The TEA5170 can be externally synchronized by

higher or lower frequency signal, then it could be

used in applications like TV set ones. For more

details, refer to application note AN408/0591.

1/9