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NXP Semiconductors
OSCILLATOR
SSL2103
Dimmable Greenchip controller for LED lighting
RC
5V
24 μ A
Comparator
RC2
R2
10 k Ω
C1
330 pF
R1
220 k Ω
BRIGHTNESS
V
V
rc_threshold
001aam657
Fig 3.
Brightness control block
A typical RC waveform is shown in Figure 4 . The RC switch-over threshold is controlled
by the BRIGHTNESS pin.
To ensure that the capacitor can be charged within the charge time, the value of the
oscillator capacitor should be limited to 1 nF. Due to leakage current, the value of the
resistor connected between the RC pin and the ground should be limited to a maximum of
220 k ? .
Voltage
(mV)
RC voltage
rc_threshold
75 mV
time
014aab108
Fig 4.
Brightness timing waveform
8.3 Duty factor control
The duty factor is controlled by an internally regulated voltage and the oscillator signal on
pin RC. The internal regulation voltage is set by the voltage on the PWMLIMIT pin.
A low PWMLIMIT voltage will results in a low on-time for the external power switch. The
minimum duty factor of the switched mode power supply can be set to 0 ? . The maximum
duty factor is set to 75 ? .
8.4 Bleeder for dimming applications
The SSL2103 IC contains some circuitry intended for mains dimmer compatibility. This
circuitry can drive two external current sinks, called bleeders. A strong bleeder is used for
zero-cross reset of the dimmer and TRIAC latching. A weak bleeder is added to maintain
the hold current through the dimmer.
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.
6 of 21
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