TEA1623PH Philips Semiconductors, TEA1623PH Datasheet - Page 8

• Manufacturer Part Number: TEA1623PH
• Description: STARplug
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 12579
Product data sheet
8.6.1 Overcurrent protection
8.6.2 Short winding protection
8.6.3 Overtemperature protection
8.6.4 Overvoltage protection
8.7.1 Input
8.7.2 Accuracy
8.5 Demagnetization
8.6 Protections
8.7 Characteristics of the complete power-plug
The system operates in discontinuous conduction mode all the time. As long as the
secondary stroke has not ended, the oscillator will not start a new primary stroke. During
the suppression time t
may be necessary in applications where the transformer has a large leakage inductance
and at low output voltages.
The cycle-by-cycle peak drain current limit circuit uses the external source resistor R
Figure
time t
primary peak current.
The short winding protection circuit is also activated after the leading edge blanking time.
If the source voltage exceeds the short winding protection voltage V
TEA1623PH stops switching. Only a power-on reset will restart normal operation. The
short winding protection also protects in case of a secondary diode short circuit.
An accurate temperature protection is provided in the TEA1623P; TEA1623PH. When the
junction temperature exceeds the thermal shutdown temperature, the IC stops switching.
During thermal protection, the IC current is lowered to the start-up current. The IC
continues normal operation as soon as the overtemperature situation has disappeared.
Overvoltage protection can be achieved in the application by pulling pin REG above its
normal operation level, or by keeping the level of pin AUX above V
primary stroke is terminated immediately, and no new primary stroke is started until the
voltage on pin REG drops to its normal operation level. Pin REG has an internal clamp.
The current feed into pin REG must be limited.
The input voltage range comprises the universal AC mains from 80 V to 276 V.
The accuracy of the complete converter, functioning as a voltage source with primary
sensing, is approximately 8 % (mainly dependent on the transformer coupling). The
accuracy with secondary sensing is defined by the accuracy of the external components.
For safety requirements in case of optocoupler feedback loss, the primary sensing
remains active when an overvoltage circuit is connected.
leb
6) to measure the current. The circuit is activated after the leading edge blanking
. The protection circuit limits the source voltage to V
suppr
Rev. 01 — 17 March 2004
, demagnetization recognition is suppressed. This suppression
TEA1623P; TEA1623PH
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
source(max)
demag
swp
, and thus limits the
, the TEA1623P;
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. The current
STARplug
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