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TEA2164S Datenblatt(PDF) 10 Page - STMicroelectronics

Teilenummer TEA2164S
Bauteilbeschribung  SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA2164S Datenblatt(HTML) 10 Page - STMicroelectronics

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II - GENERAL DESCRIPTION (continued)
Collector
Current
Envelop
Capacitor
C2 Voltage
I
CM2
V
C2
T
burst
t
0
0
t
Figure 11 : Repetitive Over-current Protection
78
CURRENT
MIRROR
R
O
C
O
R
R
1k
Ω
3.2V
5V
15k
Ω
7.5k
Ω
9.1k
Ω
13.4k
Ω
Q
I
O
I
O
T
R
T
R
V
8
0
1.66V
2.74V
T
charge
T
O
T
R
T
O ~Tcharge +TR
T
O ~ 0.4 ROCO + 0.47 CORR
R
R ~ 1000Ω
C
O in Farad, RO in Ohms
Q conductingin burst mode
Figure 12 : Free Frequency Running
III - SWITCHING OSCILLATOR AND SYNCHRONIZATION
III.1. Switching oscillator
When the TEA2164S control circuit operates in
burst mode, the switching frequency is fixed by the
free frequency oscillator. The period is determined
by two external components CO and RO.
III.2. Synchronization
When the master-circuit starts to send pulses both
oscillators are not synchonuous.
In order to avoid any erratic conduction of the
power transistor, the first synchronizationpulse will
arrive simultanously with the sawtooth return of the
TEA2164S oscillator.
To get synchronization the free frequency must be
higher than the synchronization frequency.
TO <Tsync. < 1.50 TO
TEA2164S
10/16


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