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LM3444 Datasheet(PDF) 9 Page - Texas Instruments |
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LM3444 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 27 page ICOLL V+ VAC + + 1 2 3 4 5 6 7 8 9 10 - VLED GND VCC FILTER NC NC ISNS GATE NC COFF NC LM3444 VLED- D3 C7 C9 C10 D4 D8 D9 R2 D1 Q1 C5 C12 D2 D10 Q2 L2 Q3 R3 R4 C11 C4 U1 VBUCK BR1 LM3444 www.ti.com SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015 Feature Description (continued) Figure 8. LM3444 Schematic 7.3.2 Valley-Fill Circuit VBUCK supplies the power which drives the LED string. Diode D3 allows VBUCK to remain high while V+ cycles on and off. VBUCK has a relatively small hold capacitor C10 which reduces the voltage ripple when the valley fill capacitors are being charged. However, the network of diodes and capacitors shown between D3 and C10 make up a valley-fill circuit. The valley-fill circuit can be configured with two or three stages. The most common configuration is two stages. Figure 9 illustrates a two- and three-stage valley-fill circuit. Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3444 |
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