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SSL2109T Datasheet(PDF) 13 Page - NXP Semiconductors |
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SSL2109T Datasheet(HTML) 13 Page - NXP Semiconductors |
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13 / 19 page 
SSL2109T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2 — 26 April 2012 13 of 19 NXP Semiconductors SSL2109T GreenChip controller for LED lighting 12. Application information A LED driver with the SSL2109T is a buck converter operating in BCM, see Figure 6. Capacitor C3 buffers the IC supply voltage, which is powered via the HV pin at start-up and via C5 during normal operation. Sense resistors R4 and R5 converts the current through MOSFET Q1 into a voltage on pin Source. The value of these resistors defines the maximum primary peak current on MOSFET Q1, and thus the LED current. Resistor R6 reduces the reverse current into the DRIVER pin. The DRAIN pin is connected with the drain of Q1 for valley detection. In the example shown in Figure 6, the NTC pin is used for temperature protection. The temperature level is set by Negative Temperature Coefficient (NTC) resistor R3 and capacitor C4 reduces noise on the NTC pin. Further information can be found in the SSL2109T application note. Fig 6. A typical SSL2109T application SSL2109 HV U1 DRAIN VCC GND NTC DVDT SOURCE R3 NTC 100 kΩ C4 1 nF C6 10 μF 160 V D2 BYV25G-600 C3 1 μF 16 V DRIVER aaa-001746 1 2 3 4 6 5 8 7 C2 3.3 μF 400 V C1 2.2 μF 385 V L1 1 mH 500 mA SL RV1 varistor 275 V R1 fuse L J6-1 J6-2 L N 1 1 10 Ω R2 D1 DBLS105G 1 3 4 2 U N R6 C5 100 Ω,1206 120 pF 1 kV L2 2.1 mH 1000 mA R5 1.5, 1 % R4 2.2, 1 % Q1 MOSFET N J5-1 LED+ LED- LED+ LED- J5-2 1 1 |
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