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TEA2261 Datasheet(PDF) 7 Page - STMicroelectronics

No. de pieza TEA2261
Descripción Electrónicos  SWITCH MODE POWER SUPPLY CONTROLLER
Download  11 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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TEA2261 Datasheet(HTML) 7 Page - STMicroelectronics

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The magnetization state of the transformer is
checked by sensing the voltage across a winding
of the transformer (generally the same which sup-
plies the TEA2261). This is made by connecting a
resistor between this winding and the demagneti-
zation sensing input of the circuit (Pin 1).
SECURITY FUNCTIONS OF THE TEA2260 (see flowchart below)
Undervoltage Detection. This protection works in
association with the starting device “VCC switch”
(see paragraph Starting-mode - stand-by mode). If
VCC is lower than VCCstop (typically 7.4V) output
pulses are inhibited, in order to avoid wrong oper-
ation of the power supply or bad power transistor
drive.
Overvoltage Detection. If VCC exceeds VCCmax
(typically 15.7V) output pulses are inhibited. Re-
starting of the power supply is obtained by reduc-
ing VCC below VCCstop.
Current Limitation of the Power Transistor. The
current is measured by a shunt resistor. A double
threshold system is used:
– When the first threshold (VIM1) is reached, the
conduction of the power transistor is stopped un-
til the end of the period: a new conduction signal
is needed to obtain conduction again.
– Furthermore as long as the first threshold is
reached (it means during several periods), an ex-
ternal capacitor C2 is charged. When the voltage
across the capacitor reaches VC2 (typically
2.55V) the output is inhibited. This is called the
“repetitive overload protection”. If the overload
disappears before VC2 is reached, C2 is dis-
charged, so transient overloads are tolerated.
– Second current limitation threshold (VIM2). When
this threshold is reached the output of the circuit
is immediately inhibited. This protection is helpful
in case of hard overload for example to avoid the
magnetization of the transformer.
Restart of the Power Supply. After stopping due
to VC2, VIM2, VCCMax or VCCstop triggering, re-
start of the power supply can be obtained by the
normal operating of the “VCC switch” but thanks to
an integrated counter, if normal restart cannot be
obtained after three trials, the circuit is definitively
stopped. In this case it is necessary to reduce VCC
below approximately 5V to reset the circuit. From a
practical point of view, it means that the power
supply has to be temporarily disconnected from
any power source to get the restart.


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