R_COMP, C_COMP and C_HF configure the error amplifier gain and phase characteristics to produce a stable voltage loop. For a quick start, follow the following four steps:

1. Select crossover frequency, f_C. Select the cross over frequency (f_C) at one fifth of the RHPZ frequency or one tenth of the switching frequency whichever is lower. Choose RHPZ with minimum input voltage and maximum output voltage.
   Equation 73. $\frac{{\mathrm{f}}_{\mathrm{s}\mathrm{w}}}{10}=40\mathrm{k}\mathrm{H}\mathrm{z}$
   Equation 74. $\frac{{\mathrm{f}}_{\mathrm{R}\mathrm{H}\mathrm{P}\mathrm{Z}}}{5}=\frac{{\mathrm{R}}_{\mathrm{o}\mathrm{u}\mathrm{t}}\times {\mathrm{D}\mathrm{\text{'}}}^2}{{5\times 2\mathrm{\pi }\times \mathrm{L}}_{\mathrm{m}\_\mathrm{e}\mathrm{q}}}=1.6\mathrm{k}\mathrm{H}\mathrm{z}$

   Crossover frequency f_c=1.6kHz is selected.

2. Determine required R_COMP

   Knowing f_c, R_COMP is calculated as follows:

   Equation 75. ${\mathrm{R}}_{\mathrm{C}\mathrm{O}\mathrm{M}\mathrm{P}}=\frac{2\mathrm{\pi }\times {\mathrm{f}}_{\mathrm{c}}\times {\mathrm{C}}_{\mathrm{o}\mathrm{u}\mathrm{t}}\times {\mathrm{A}}_{\mathrm{c}\mathrm{s}}\times {\mathrm{R}}_{\mathrm{c}\mathrm{s}\_\mathrm{e}\mathrm{q}}}{\mathrm{D}\mathrm{\text{'}}\times {\mathrm{K}}_{\mathrm{F}\mathrm{B}}\times {\mathrm{g}}_{\mathrm{m}}{\times \mathrm{G}}_{\mathrm{A}\mathrm{C}\mathrm{B}}\left(2\mathrm{\pi }\times {\mathrm{f}}_{\mathrm{c}}\right)}=\frac{2\mathrm{\pi }\times 1.6\mathrm{k}\mathrm{H}\mathrm{z}\times 900\mathrm{\mu }\mathrm{F}\times 10\times 0.75\mathrm{m}\mathrm{\Omega }}{0.2\times \frac{1}{30}\times 1\frac{\mathrm{m}\mathrm{A}}{\mathrm{V}}\times \frac{1}{2}}=20.4\mathrm{k}\mathrm{\Omega }$

   A standard value of 20kΩ is selected for R_COMP

3. Determine C_COMP
   Place ω_{Z_EA} at the load pole frequency ω_{P_LF} to cancel load pole. Knowing R_COMP, C_COMP is calculated as follows:
   Equation 76. ${\mathrm{C}}_{\mathrm{C}\mathrm{O}\mathrm{M}\mathrm{P}}=\frac{1}{{\mathrm{R}}_{\mathrm{C}\mathrm{O}\mathrm{M}\mathrm{P}}\times {\mathrm{\omega }}_{\mathrm{P}\_\mathrm{L}\mathrm{F}}}=\frac{1}{20\mathrm{k}\mathrm{\Omega }\times \frac{2}{2.025\mathrm{\Omega }\times 900\mathrm{\mu }\mathrm{F}}}=45\mathrm{n}\mathrm{F}$
   A standard value of 47nF is selected for C_COMP
4. Determine C_HF.

   Place ω_HF at ω_RHPZ or ω_{Z_ESR} zero whichever is lower. Knowing R_COMP, RHPZ and ESR zero, C_HF is calculated as follows:

   Equation 77. ${\mathrm{C}}_{\mathrm{H}\mathrm{F}}=\frac{1}{{\mathrm{R}}_{\mathrm{C}\mathrm{O}\mathrm{M}\mathrm{P}}\times {\mathrm{\omega }}_{\mathrm{H}\mathrm{F}}}=\frac{1}{20\mathrm{k}\mathrm{\Omega }\times 49\mathrm{k}\mathrm{H}\mathrm{z}}=1\mathrm{n}\mathrm{F}$
   A standard value of 1nF is selected for C_HF.