SLVUBB4 User guide

SLVUBB4B November 2017 – February 2023

12.2.10 Transfer Function Isolated Type II Compensation Network Without a Zener Clamp

#T5147377-118 is a schematic of an isolated Type II compensation network without a Zener clamp.

Figure 12-6 Schematic of an Isolated Type II Compensation Network Without a Zener Clamp

Equation 107.

\frac{{\hat{v}}_{c}}{{\hat{v}}_{o u t}} = - C T R (s) \times \frac{R_{P}}{R_{D}} \times [{1 + G}_{E A} (s) \times \frac{1}{1 + (\frac{1}{A_{O L}} + \frac{s}{ω_{B W}}) + (1 + G_{F B} (s))}]

Equation 108.

G_{E A} (s) = \frac{A_{V M} \times \frac{ω_{Z E A}}{s} \times (1 + \frac{s}{ω_{Z E A}})}{(1 + \frac{C_{H F}}{C_{C O M P}}) \times (1 + \frac{s}{ω_{H F}})}

Equation 109.

G_{F B} (s) = \frac{A_{V M} \times \frac{ω_{Z E A}}{s} \times (1 + \frac{s}{ω_{Z E A}})}{\frac{R_{F B B}}{R_{F B B} + R_{F B T}} \times (1 + \frac{C_{H F}}{C_{C O M P}}) \times (1 + \frac{s}{ω_{H F}})}

Equation 110.

C T R (s) = \frac{C T R}{1 + \frac{s}{ω_{O P T O}}}

DC-Gain:

Equation 111.

A_{V M} = C T R \times \frac{R_{P}}{R_{D}}

Compensation Zero:

Equation 112.

ω_{Z E A} = \frac{1}{R_{C O M P} \times C_{C O M P}}

Compensation pole:

Equation 113.

ω_{H F} = \frac{1}{R_{C O M P} \times C_{H F}}

Note:

Loop Calculator Tips

A Type I compensation network can be simulated by choosing a Type II compensation (Type II, Type II isolated with a Zener clamp, Type II isolated with inner loop) and setting R_COMP equal to R_FBT. The crossover frequency depends on the value of C_COMP. Set C_HF equal to C_COMP.