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SSL2109T Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. SSL2109T
Description  GreenChip controller for LED lighting
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

SSL2109T Datasheet(HTML) 5 Page - NXP Semiconductors

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SSL2109T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2 — 26 April 2012
5 of 19
NXP Semiconductors
SSL2109T
GreenChip controller for LED lighting
8.
Functional description
8.1 Introduction
The SSL2109T is an IC intended for small form factor retrofit SSL lamps and separate
LED drivers.
8.2 Converter operation
The converter in the SSL2109T is a Boundary Conduction Mode (BCM), peak current
controlled system. For the basic application diagram see Figure 3, for the waveforms see
Figure 4. 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 IL is zero when the MOSFET is switched on. Thereafter, the amplitude of
the current build-up in L is proportional to VIN VOUT and the time that the MOSFET switch
is on. When the 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 VOUT. The LED current ILED is almost equal to half the peak switch current. A
new cycle is started, as soon as the inductor current IL is zero.
8.3 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.
8.4 Driver pin
The SSL2109T is equipped with an external driver that can control an external switch. The
voltage on the driver output pin is increased towards Vo(DRIVER)max to open the switch
during the first cycle (t0 to t1). The voltage on the driver output pin is pulled down towards
Vo(DRIVER)min from the start of the secondary stroke until the next cycle starts (t0 to t00).
During transition from low to high and back, there is a controlled switching slope
steepness. This controlled condition limits the high frequency radiation from the circuit to
the surrounding area.
Fig 3.
Basic application diagram SSL2109T
SSL2109
HV
DVDT
VCC
DRAIN
NTC
DRIVER
GND
NTC
LEDs
SOURCE
aaa-001743
1
2
3
7
5
4
6
8
Rinrush
Rsense
Vsec


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