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LT3479EDE-TR Datasheet(PDF) 10 Page - Linear Technology |
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LT3479EDE-TR Datasheet(HTML) 10 Page - Linear Technology |
10 / 20 page LT3479 10 3479fb APPLICATIONS INFORMATION GND GND SS VC FBN FBP VREF SW SW L VS VIN RT SHDN LT3479 RT R2 CSS RC R1 CC COUT D CIN CS L1 MINIMIZE THE AREA OF THIS TRACE TO VS TO VIN TO GND TO SHDN 3479 F04 PLACE VIAS AROUND EXPOSED PAD TO ENHANCE THERMAL PERFORMANCE TO VOUT Figure 4. Suggested Board Layout Switching Frequency The switching frequency of the LT3479 is set by an exter- nal resistor attached to the RT pin. Do not leave this pin open. A resistor must always be connected for proper operation. See Table 4 and Figure 7 for resistor values and corresponding frequencies. Table 4. Switching Frequency SWITCHING FREQUENCY (MHz) RT (kΩ) 3.5 1.78 3 2.87 2.5 4.32 2 6.49 1.5 10.2 1 17.8 0.5 39.2 0.2 113 Figure 5. Start-Up with No Soft-Start Capacitor 0.2MS/DIV IL 2A/DIV VOUT 5V/DIV 3479 F05 Figure 6. Start-Up with CSS = 22nF 0.2ms/DIV IL 2A/DIV VOUT 5V/DIV 3479 F06 |
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