TEA2164 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

View to exact match

TEA2164

SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT

STMicroelectronics 

TEA2164

Figure 5 : Burst Mode Waveforms

Figure 6 : Power Supply Start-up

Tch ≈ 1s (typ)

T1 ≈ 0.3s (typ)

Tstart-up = Tch + T1

T1 : necessary time for voltage setting-up

d) Abnormal conditions : safety functions

Overvoltage Protection

When VCC exceeds VCC max, an internal flip-flop

stops output conduction signals. The circuit will

start again after the capacitor C1 discharge ; it

means : after loss of synchronization or after Vcc

stop crossing (Figure 7).

In flyback converters, this function protects the

power supply against output voltage runaway.

Under Voltage Lock-out

The TEA2164 control circuit stops operating when

VCC goes under VCC stop.

Power Limitation, Current Protection, Long

Duration Overload Protection

- Output power limitation : by a pulse by pulse

collector current limitation the TEA2164 limits the

maximum output power. VCM1 is the correspond-

ing voltage threshold, its detection is memorized

up to the next period.

- Current protection (transistor protection)

Under particular conditions a hard overload or

short circuit may induce a flux runaway in spite of

the current limitation (VCM1).

The TEA2164 control circuit features a second

current protection, VCM2. When this threshold is

reached an internal flip-flop memorizes it and

8/15

Share Link: