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SSL2115X

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Product data sheet

Rev. 2 — 7 June 2012

4 of 15

NXP Semiconductors

SSL2115X

Low-cost non-dimmable LED driver IC

Functional description

8.1 Introduction

The SSL2115X is an integrated circuit intended for retrofit small form factor SSL lamps. It

provides a controller with an internal high-voltage switch to drive LEDs. It operates directly

from the rectified mains.

8.2 Current source operation

A flyback inductor is calculated using Equation 1:

(1)

Where

•  is the efficiency of the complete flyback converter

• fsw(high) is the high switching frequency

• Umax the maximum combined voltage of the connected LEDs and the voltage drop of

the output rectifier

• L is the primary inductance of the flyback transformer

• Ipk is the peak current through of the flyback transformer

(2)

VDRAIN = voltage on pin DRAIN

ton = turn-on time

toff = turn-off time

VM = peak voltage

Vi = input voltage

N = transformer winding turns ratio

VOUT = output voltage.

Fig 3.

Drain switching wave form

DDD

9'5$,1

9L Q9RXW

WRQ

WRII

WVZ

IUHHUXQQLQJ

LED

max





0.85

 f

sw high

 0.5 Ipk





--------------------------------------------------------------------

ref high

pk

SOURCE

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