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SSL21084T Datasheet(PDF) 5 Page - NXP Semiconductors |
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SSL21084T Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 24 page SSL21081T_2T_3T_4T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Preliminary data sheet Rev. 2 — 6 December 2011 5 of 24 NXP Semiconductors SSL21081T/2T/3T/4T GreenChip drivers for LED lighting 7.2 Pin description 8. Functional description 8.1 Converter operation The converter in the SSL2108X is a Boundary Conduction Mode (BCM), peak current controlled system. For the basic application diagram see Figure 4, for the waveforms see Figure 5. This converter type operates at the boundary between continuous and discontinuous mode. Energy is stored in inductor L each period that the switch is on. The inductor current IL is zero when the internal MOSFET switch is switched on. Thereafter, the amplitude of the current build-up in L is proportional to VIN VOUT and the time that the internal MOSFET switch is on. When the internal MOSFET switch is switched off, the current continues to flow through the freewheel diode and the output capacitor. The current then falls at a rate proportional to the value of VOUT. The LED current ILED is almost equal to half the peak switch current. A new cycle is started, as soon as the inductor current IL is zero. Table 4. Pin description Symbol Pin (SO8) SSL2108X Pin (SO12) SSL2108X Description HV 1 1 high-voltage supply pin SOURCE 2 3 low-side internal switch VCC 3 4 supply voltage NTC 4 5 LED temperature protection input GND 6, 7 2,6,7,10,11 ground DVDT 5 9 AC supply pin TONMAX - 8 brownout protection timer input DRAIN 8 12 high-side internal switch Fig 4. Basic application diagram SSL2108X (SO8 variant) 001aan693 5 Rinrush 8 42 NTC 6, 7 GND SOURCE NTC Rsense L DVDT DRAIN Vsec LEDs 1 3 HV VCC SSL2108X |
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