tea1506 NXP Semiconductors, tea1506 Datasheet - Page 10

• Manufacturer Part Number: tea1506
• Description: Greenchip Smps Control Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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, t
voltage to an internal level.
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:
where:
The current information is used to adjust the peak drain
current, which is measured via pin I
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
handbook, halfpage
GreenChip II SMPS control IC
MGU236
N
100 A
(typ)
=
N
----------- -
Fig.10 OPP correction curve.
N
aux
p
I DEM
leb
. The OCP circuit limits the ‘sense’
I
DEM
24 A
(typ)
-------------- -
R
V
DEM
aux
sense
. The internal
N V
--------------------------
0.52 V
(typ)
0.3 V
(typ)
V sense(max)
R
DEM
mains
10
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 V
converter will stop switching. Once V
UVLO level, capacitor C
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 V
This process is repeated as long as the OTP condition
exists.
start
level is reached, switching starts again.
TEA1506P; TEA1506AP;
TEA1506T; TEA1506AT
VCC
will be recharged and the
Product specification
CC
drops below the
swp
, the