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NXP Semiconductors
SSL2103
Dimmable Greenchip controller for LED lighting
8. Functional description
The SSL2103 is an LED driver IC that operates directly from the rectified mains. The
SSL2103 uses on-time mode control and frequency control to control the LED brightness.
The BRIGHTNESS and PWMLIMIT input of the IC can be used to control the LED light
output in combination with an external dimmer. The PWMLIMIT input can also be used for
Thermal Lumen Management (TLM) and for precision LED current control.
8.1 Start-up and Under Voltage Lock Out (UVLO)
Initially, the IC is self-supplying from the rectified mains voltage. The IC starts switching as
soon as the voltage on pin V CC passes the V CC(startup) level. The supply can be taken over
by the auxiliary winding of the transformer as soon as V CC is high enough and the supply
from the line is stopped for high efficiency operation. Alternatively the IC can be supplied
via a bleeder resistor connected to a high voltage.
Remark: The maximum V CC voltage rating of the IC must be considered.
8.2 Oscillator
An oscillator inside the IC provides the timing for the switching converter logic.
The frequency of the oscillator is set by the external resistors and the capacitor on pin RC
and pin RC2. The external capacitor is charged rapidly to the V RC(max) level and, starting
from a new primary stroke, discharges to the V RC(min) level. Because the discharge is
exponential, the relative sensitivity of the duty factor to the regulation voltage at low duty
factor, is almost equal to the sensitivity at high duty factors. This results in a more constant
gain over the duty factor range, compared to Pulse Width Modulated (PWM) systems with
a linear sawtooth oscillator. Stable operation at low duty factors is easily achieved. The
frequency of the converter when V BRIGHTNESS is high can be calculated using Equation 1 :
RC = ------- ? ? -------- – t ch arg e ?
3.5 ? f osc
1 1
?
(1)
R equals the parallel resistance of both oscillator resistors. C is the capacitor connected at
the RC pin (pin 7).
The BRIGHTNESS input controls the frequency reduction mode. Figure 3 shows that the
oscillator switches over from an RC curve with R1/R2, to R1 only. A low BRIGHTNESS
voltage will reduce the switching frequency.
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.
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