TEA2164S 데이터 시트보기 (PDF) - STMicroelectronics

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TEA2164S

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

II - GENERAL DESCRIPTION (continued)

Figure 5 : Master Slave Mode Waveforms

SLAVE

CIRCUIT

Synchronization

MASTER

CIRCUIT

Sync.

Pulses

PWM

Signal

Pulse

Input

TEA2164S

Base

Current

Figure 6 : Burst Mode Waveforms

Collector

θ

Current

Envelop

0

Soft Start

t

4V

P2

C1

Voltage

(Pin 10)

1V

10

9

0

t

Tb

TEA2164S

ton

3.3 - 1.6 (V9)

T Max.

Output

Voltage

C1

0

t

Tb

106 (C in Farad)

3.3

θ

0.13

Tb

II.3 - Power Supply Start-up

After the mains have been switched-on, the VCC

storage capacitor of the TEA2164S is charged

through a high value resistor connected to the

rectified high voltage.

When Vcc reaches VCC start threshold (9V typ), the

TEA2164 starts operating in burst mode. Since

available output power is low in burst mode the

output power consumption must remain low before

complete setting-up of output voltage.

In TV application it can be achieved by main-

taining the TV in stand-by mode during start-up

(Figure 7).

7/16

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