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SSL2102 Datasheet(PDF) 6 Page - NXP Semiconductors |
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SSL2102 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 21 page SSL2102_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 29 June 2009 6 of 21 NXP Semiconductors SSL2102 SMPS IC for dimmable LED lighting A typical RC waveform is given 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. Leakage current limits the value of the resistor connected between the RC pin and the ground should be limited to a maximum of 220 k Ω. 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 internal 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 %. Fig 3. Brightness control block Fig 4. Brightness timing waveform. STARplug OSCILLATOR 24 µA 5 V rc_threshold Comparator R2 10 k Ω R1 220 k Ω C1 330 pF BRIGHTNESS RC RC2 V V 014aaa574 time 014aaa582 rc_threshhold 75 mV RC voltage Voltage (mV) |
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