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LT1946A Datasheet(PDF) 9 Page - Linear Technology |
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LT1946A Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LT1946A 9 sn1946a 1946afs Diode Selection A Schottky diode is recommended for use with the LT1946A. The Microsemi UPS120 is a very good choice. Where the input to output voltage differential exceeds 20V, use the UPS140 (a 40V diode). These diodes are rated to handle an average forward current of 1A. For applications where the average forward current of the diode is less than 0.5A, an ON Semiconductor MBR0520 diode can be used. Setting Output Voltage To set the output voltage, select the values of R1 and R2 (see Figure 1) according to the following equation: RR V V OUT 12 125 1 = . – A good range for R2 is from 5k to 30k. Layout Hints The high speed operation of the LT1946A demands careful attention to board layout. You will not get advertised performance with careless layouts. Figure 6 shows the recommended component placement for a boost con- verter. 1 2 8 7 3 4 6 5 L1 C2 LT1946A VOUT VIN GND SHUTDOWN R1 R2 MULTIPLE VIAs GROUND PLANE 19949 F04 C1 + RC CC CSS Figure 6. Recommended Component Placement for Boost Converter NOTE: DIRECT HIGH CURRENT PATHS USING WIDE PC TRACES. MINIMIZE TRACE AREA AT PIN 1(VC) AND PIN 2(FB). USE MULTIPLE VIAS TO TIE PIN 4 COPPER TO GROUND PLANE. USE VIAS AT ONE LOCATION ONLY TO AVOID INTRODUCING SWITCHING CURRENTS INTO THE GROUND PLANE. FREQUENCY (Hz) 100 50 0 –50 100 10k 100k 1M 1946A FO5a 1k FREQUENCY (Hz) 0 –100 –200 100 10k 100k 1M 1946A FO5b 1k –180 58 ° Figure 5. Gain and Phase Plots of Figure 1 Circuit APPLICATIO S I FOR ATIO |
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