LM2623

www.ti.com

SNVS188H – MAY 2004 – REVISED NOVEMBER 2014

Typical Application (continued)

8.2.2.3 Setting the Output Voltage

(1)

low ripple voltage source (less than 200 millivolts), it may be advisable to use an RC filter to clean it up.

8.2.2.5 Setting the Switching Frequency

and the FREQ pin. See Figure 3 in the Typical Characteristics section of the data sheet for choosing the R3

value to achieve the desired switching frequency. A high switching frequency allows the use of very small surface

mount inductors and capacitors and results in a very small solution size. A switching frequency between 300 kHz

and 2 MHz is recommended.

8.2.2.6 Output Diode Selection

A Schottky diode should be used for the output diode. The forward current rating of the diode should be higher

than the peak input current, and the reverse voltage rating must be higher than the output voltage. Do not use

ordinary rectifier diodes, since slow switching speeds and long recovery times cause the efficiency and the load

regulation to suffer.

8.2.3 Application Curves

Figure 10. Efficiency vs Output Current

Figure 11. Output Voltage vs Output Current

Copyright © 2004–2014, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Links: LM2623