SSL2115X datasheet(5/15 Pages) NXP

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SSL2115X

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Product data sheet

Rev. 2 — 7 June 2012

5 of 15

NXP Semiconductors

SSL2115X

Low-cost non-dimmable LED driver IC

Where

• Vref(high)pk is the peak high reference voltage

• RSOURCE 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 (toff)

A blanking time is applied at the beginning of toff during tblank 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 VCC(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 VCC(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

Umax value of  29 V

8.7 Peak current detection

The cycle-by-cycle peak drain current limit circuit uses the external source resistor

RSOURCE 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 RSOURCE

to Vth(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

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