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SSL2109T Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. SSL2109T
Description  GreenChip controller for LED lighting
Download  19 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

SSL2109T Datasheet(HTML) 6 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
6 of 19
NXP Semiconductors
SSL2109T
GreenChip controller for LED lighting
8.5 Valley detection
A new cycle is started when the primary switch is switched on (see Figure 4). In the
following sections on represents the conductive state and off the non-conductive state.
Following time t1, when the peak current is detected on the SOURCE pin, the switch is
turned off and the secondary stroke starts at t2. When the secondary stroke is completed
with the coil current at t3 equaling zero, the drain voltage starts to oscillate at
approximately VIN  VOUT level. The peak to peak amplitude equals 2 × VOUT. A special
feature, called valley detection is an integrated part of the SSL2109T 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 at t00 and as a result
the capacitive switching losses are reduced. A valley is detected and accepted if both the
frequency of the oscillations and the voltage swing are within the range specified (fring and
∆Vvrec(min)) for detection. ∆Vvrec(min) is the voltage differential between the HV (pin) in and
the DRAIN pin. If a valid valley is not detected, the secondary stroke is continued until the
maximum off-time (toff(high)) is reached, then the next cycle is started.
Fig 4.
Buck waveforms and valley detection
aaa-001744
demagnetization
VIN
valley
VGATE
VDRAIN
0
0
IL
VOUT
magnetization
3
2
t1
t0
t00
t2
t3
T
4
1


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