AN892 Datasheet, PDF(15/16 Page) Silicon Laboratories – DESIGN GUIDE FOR ISOLATED DC/DC USING THE

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AN892 Datasheet, PDF (15/16 Pages) Silicon Laboratories – DESIGN GUIDE FOR ISOLATED DC/DC USING THE

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AN892

To achieve good phase margin, it is suggested to place the zero between 1/4th to 1/10th of the estimated

crossover frequency. The zero placement was chosen to lead the crossover frequency by a factor of 6.

C11 = -2---ï°----f--c--6--ï´----R-----7-- = -2---ï°-----ï´-----1---2---.--1----x---1----0-6--3----ï´-----4---9----.-9----x---1----0---3- = 1.58nF

Equation 52.

A 1.5 nF capacitor was chosen.

4.8. Design Summary

Table 2 shows the component selection that meet the design requirements.

Table 2. Design Summary

Part Reference

Description

Manufacturer

Manufacturer Part

Number

C1 C2 C10

CAP, 10uF, 10V, Â±10%, X7R, 1206

Venkel

C1206X7R100-106K

C11

CAP, 1.5nF, 16V, Â±10%, X7R, 0603

Venkel

C0603X7R160-152K

DIO, FAST, 40V, 1.0A, SOD-128

Panasonic

DB2440100L

R5 R7

RES, 49.9K, 1/10W, Â±1%, ThickFilm, 0603 Venkel

CR0603-10W-4992F

RES, 13.3K, 1/16W, Â±1%, ThickFilm, 0603 Venkel

CR0603-16W-1332F

TRANSFORMER, POWER, FLYBACK, UMEC

UTB02185S

2.0uH PRIMARY, 100nH LEAKAGE, 1:4,

1 TAP, SMT

Rev. 0.1

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