TEA2164S 데이터 시트보기 (PDF) - STMicroelectronics

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TEA2164S

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

TEA2164S

II - GENERAL DESCRIPTION

In a master slave architecture,the TEA2164SCon-

trol IC, located at the primary side of an off line

power supplyachievesthe slavefunction; whereas

the master circuit is located at the secondary side.

The link between both circuits is realizedby a small

pulse transformer (Figure 4).

In the operation of the master-slave architecture,

four majors cases must be considered :

- normal operating

- stand-by mode

- power supply start-up

- abnormal conditions : off load, short circuit, ...

II.1 - Normal Operating (master slave mode)

In this configuration,the master circuit generates a

pulse width modulatedsignal issued from the moni-

toring of the output voltage which needs the best

accuracy (in TV applications : the horizontal deflec-

tionstage supply voltage). Themaster circuit power

supply can be supplied by another output.

Figure 4 : System Description Waveforms

The PWM signal are sent towards the primary side

through small differentiating transformer. For the

TEA2164Spositive pulses are transistorswitching-

on commands ; and negative pulses are transistor

switching-off commands (Figure 5). In this configu-

ration, only by synchronizing the master oscillator,

the switching transistor may be synchronized with

an external signal.

II.2 - Stand-by Mode

In this configuration the master circuit no longer

sends PWM signals, the structure is not synchro-

nized ; and the TEA2164Soperates in burst mode.

The average power consumption at the secondary

side may be very low 1W ≤ P ≤ 6W (as it is

consumed in TV set during stand by).

By action on the maximum duty cycle control, a

primary loop maintains a semi-regulation of the

output voltages.Voltage on feed-backis applied on

Pin 9.

Burstperiodis externallyprogrammed bycapacitor C1.

VCC(START)

TEA2164S

VCC

Voltage

0

VCC(STOP)

Collector

Current

Envelop

0

tBURST

B

B

b

Output

Voltage

0

TEA5170

Output

Voltage

Envelop

0

1 µP Supply

Voltage

2 Standby

0

1

tDELAY

Start-up

b

2

t1

Standby

Normal Operation

t

t

b

b

t

t

t

t2

Standby

tBURST : burst period

tDELAY : time constant generated by µP

B : burst envelop (out of regulation)

b : burst envelop (with standby regulation)

t1, t2 : commands issued by µP

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