Datasheet

5A 350KHz 25V Buck DC to DC Converter

6

Test Circuit and Layout guidelines

Figure5. Standard Test Circuits and Layout Guides

Select R1 to be approximately 2K, use a 1% resistor for best stability.

C1 and CFF are optional; in order to increase stability and reduce the input power line noise, CIN

and C1 must be placed near to PIN1 and PIN3;

For output voltages greater than approximately 10V, an additional capacitor CFF is required. The

compensation capacitor is typically between 100 pf and 33 nf, and is wired in parallel with the

output voltage setting resistor, R2. It provides additional stability for high output voltage, low

input-output voltages, and/or very low ESR output capacitors, such as solid tantalum capacitors.

CFF=1/(31*1000*R2); This capacitor type can be ceramic, plastic, silver mica, etc. (Because of

the unstable characteristics of ceramic capacitors made with Z5U material, they are not

recommended.)

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