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NXP Semiconductors
SSL2103
Dimmable Greenchip controller for LED lighting
The SB_DRV output is activated when the maximum voltage on pin HVDET is below the
V th(SBLEED) level (52 V typically). The WB_DRV output is activated as soon as the voltage
on pin ISENSE exceeds the V th(high)(ISENSE) level ( ? 100 mV typically). The WB_DRV
output is deactivated when the ISENSE voltage drops below the V th(low)(ISENSE) level
( ? 250 mV typically). The WB_DRV output is also deactivated when the strong bleeder
switch is switched on. See Figure 5 .
HVDET
INTEGRATED
WB_DRV
B1
Q
S R
LOW V DETECT
SB_DRV
? 0.1 V
OR
? 0.25 V
Fig 5.
ISENSE
Bleeder circuit
GND
001aam658
8.5 Valley switching
A new cycle is started when the primary switch is switched on (see Figure 6 ). After a time
determined by the oscillator voltage, RC and the internal regulation level, the switch is
turned off and the secondary stroke starts. The internal regulation level is determined by
the voltage on pin PWMLIMIT.
After the secondary stroke, the drain voltage shows an oscillation with a frequency of
approximately:
----------------------------------------------
1
2 ? ? ? ? L p ? C p ?
(2)
where:
L p = primary self inductance
C p = parasitic capacitance on drain node
As soon as the oscillator voltage is high again and the secondary stroke has ended, the
circuit waits for a low drain voltage before starting a new primary stroke.
Figure 6 shows the drain voltage together with the valley signal, the signal indicating the
secondary stroke and the RC voltage.
The primary stroke starts some time before the actual valley at low ringing frequencies,
and some time after the actual valley at high ringing frequencies.
SSL2103
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2.2 — 5 December 2011
? NXP B.V. 2011. All rights reserved.
7 of 21
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