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NXP Semiconductors
SSL2103
Dimmable Greenchip controller for LED lighting
8.6 Demagnetization
The system operates in discontinuous conduction mode if the AUX pin is connected. As
long as the secondary stroke has not ended, the oscillator will not start a new primary
stroke. During the first t sup(xfmr_ring) seconds, demagnetization recognition is suppressed.
This suppression may be necessary in applications where the transformer has a large
leakage inductance and at low output voltages.
8.7 Overcurrent protection
The cycle-by-cycle peak drain current limit circuit uses the external source resistor R SENSE
to measure the current. The circuit is activated after the leading edge blanking time t leb .
The protection circuit limits the source voltage over the R SENSE1 resistor to V th(ocp)SOURCE ,
and thus limits the primary peak current.
8.8 Short-winding protection
The short-winding protection circuit is also activated after the leading edge blanking time.
If the source voltage exceeds the short-winding protection threshold voltage
V th(swp)SOURCE , the IC 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.
8.9 Overtemperature protection
Accurate temperature protection is provided in the device. When the junction temperature
exceeds the thermal shut-down 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.
1.
R SENSE is the resistor between the SOURCE pin and GND
SSL2103
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.2 — 5 December 2011
? NXP B.V. 2011. All rights reserved.
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