TEA1506T View Datasheet(PDF) - Philips Electronics
Part Name
Description
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TEA1506T Datasheet PDF : 22 Pages
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Philips Semiconductors
GreenChip™II SMPS control IC
Product specification
TEA1506P; TEA1506AP;
TEA1506T; TEA1506AT
MGU236
handbook, halfpage
Vsense(max)
0.52 V
(typ)
0.3 V
(typ)
−100 µA
(typ)
IDEM
−24 µA
(typ)
Fig.10 OPP correction curve.
OverCurrent Protection (OCP)
The cycle-by-cycle peak drain current limit circuit uses the
external source resistor to measure the current accurately.
This allows optimum size determination of the transformer
core (cost issue). The circuit is activated after the leading
edge blanking time, tleb. The OCP circuit limits the ‘sense’
voltage to an internal level.
Short winding protection
After the leading edge blanking time, the short winding
protection circuit is activated. If the ‘sense’ voltage
exceeds the short winding protection voltage Vswp, the
converter will stop switching. Once VCC drops below the
UVLO level, capacitor CVCC will be recharged and the
supply will restart again. This cycle will be repeated until
the short-circuit is removed (safe restart mode).
The short winding protection will also protect in case of a
secondary diode short-circuit.
OverTemperature Protection (OTP)
An accurate temperature protection is provided in the
circuit. When the junction temperature exceeds the
thermal shutdown temperature, the IC will enter the safe
restart mode.
When the Vstart level is reached, switching starts again.
This process is repeated as long as the OTP condition
exists.
OverPower Protection (OPP)
During the primary stroke, the rectified mains input voltage
is measured by sensing the current drawn from pin DEM.
This current is dependent on the mains voltage, according
to the following formula: IDEM ≈ R--V---D--a--Eu---xM-- ≈ N------×-R----VD----Em---M-a---i-n--s-
where: N = -N--N--a---pu---x
The current information is used to adjust the peak drain
current, which is measured via pin Isense. The internal
compensation is such that an almost mains independent
maximum output power can be realized.
The OPP curve is given in Fig.10.
2003 Sep 09
10
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