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NXP Semiconductors
SSL2115X
Low-cost non-dimmable LED driver IC
8. 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.
9 '5$,1
W RQ
9 0
W RII
W VZ
9 L Q9 RXW
IUHH UXQQLQJ
9 L
DDD
V DRAIN = voltage on pin DRAIN
t on = turn-on time
t off = turn-off time
V M = peak voltage
V i = input voltage
N = transformer winding turns ratio
V OUT = output voltage.
Fig 3.
Drain switching wave form
8.2 Current source operation
A flyback inductor is calculated using Equation 1:
? I LED ? U max ?
0.85 ? ? ? f sw ? high ? ? 0.5 ? I pk
L = --------------------------------------------------------------------
2
(1)
Where
? ? is the efficiency of the complete flyback converter
? f sw(high) is the high switching frequency
? U max 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
? I pk is the peak current through of the flyback transformer
V ref ? high ? pk
I pk = ---------------------------
R SOURCE
(2)
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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