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NXP Semiconductors
SSL21081T/2T/3T/4T
GreenChip drivers for LED lighting
8. Functional description
8.1 Converter operation
The converter in the SSL2108X is a Boundary Conduction Mode (BCM), peak current
controlled system. For the basic application diagram see Figure 4 , for the waveforms see
Figure 5 . This converter type operates at the boundary between continuous and
discontinuous mode. Energy is stored in inductor L each period that the switch is on. The
inductor current I L is zero when the internal MOSFET switch is switched on. Thereafter,
the amplitude of the current build-up in L is proportional to V IN ? V OUT and the time that the
internal MOSFET switch is on. When the internal MOSFET switch is switched off, the
current continues to flow through the freewheel diode and the output capacitor. The
current then falls at a rate proportional to the value of V OUT . The LED current I LED is
almost equal to half the peak switch current. A new cycle is started, as soon as the
inductor current I L is zero.
Rinrush
V sec
LEDs
L
DVDT
DRAIN
HV
1
5
SSL2108X
8
VCC
3
6, 7
GND
4
NTC
NTC
2
SOURCE
Rsense
001aan693
Fig 4.
Basic application diagram SSL2108X (SO8 variant)
8.2 Conversion frequency
The conversion frequency must be limited to below 200 kHz. Therefore, select an
inductance value so that the conversion frequency is always within limits, given the supply
voltage, LED voltage and component spread.
8.3 Valley detection
A new cycle is started when the primary switch is switched on (see Figure 5 ). Following
time t 1 , when the peak current is detected on the SOURCE pin, the switch is turned off
and the secondary stroke starts (3). When the secondary stroke is complete and the coil
current at t 3 equals zero, the drain voltage starts to oscillate around the V IN ? V OUT level.
The amplitude equals V OUT . A special feature, called valley detection is an integrated part
of the SSL2108X circuitry. Dedicated built-in circuitry connected to the DRAIN pin, senses
when the voltage on the drain of the switch has reached its lowest value. The next cycle is
then started and as a result the capacitive switching losses are reduced.
SSL21081T_2T_3T_4T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 February 2012
? NXP B.V. 2012. All rights reserved.
6 of 23
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