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NXP Semiconductors
SSL2115X
Low-cost non-dimmable LED driver IC
Where
? V ref(high)pk is the peak high reference voltage
? R SOURCE is the value of the resistor connected to the SOURCE pin
8.3 Leading-Edge Blanking (LEB)
The controller has a fixed LEB of 325 ns to avoid wrong detection of the primary peak
current.
8.4 dV/dt detection
The end of demagnetization is detected when the voltage on the sense pin is <50 mV.
8.5 Turn-off-time (t off )
A blanking time is applied at the beginning of t off during t blank time to observe the
demagnetization.
8.6 Supply concepts VCC and UnderVoltage LockOut (UVLO)
An integrated Junction gate Field-Effect Transistor (JFET), connected to the drain voltage,
provides the start-up current.
The IC starts switching when the voltage on pin VCC exceeds the V CC(startup) level. After
start-up, an external supply is required, which an auxiliary winding connection can
provide. When the voltage on pin VCC drops below the V CC(UVLO) level, the IC stops
switching and is reset.
Design the voltage of the auxiliary winding to ensure that the VCC supply voltage has a
U max value of ? 29 V
8.7 Peak current detection
The cycle-by-cycle peak drain current limit circuit uses the external source resistor
R SOURCE to measure the primary peak current. The circuit is activated after the leading
edge blanking time. The protection circuit limits the source voltage over resistor R SOURCE
to V th(det)SOURCE , thus limiting the primary peak current.
8.8 LED OverTemperature Protection (OTP)
An external temperature dependent resistor can be applied for LED over temperature
protection.
8.9 LED Output Short-circuit Protection (OSP)
When the output short-circuit protection is activated, the IC enters shutdown mode. Only a
power-on reset (switching off the mains voltage) activates normal operation.
8.10 Output LED open-circuit protection
If an open circuit occurs on the LEDs, the output voltage increases at each cycle of the
AC/DC converter. Energy is no longer transferred to the LEDs. The energy accumulated
at the primary side is transferred to the supply of the IC via the auxiliary winding. The IC
SSL2115X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 7 June 2012
? NXP B.V. 2012. All rights reserved.
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