SP6138EB Просмотр технического описания (PDF) - Signal Processing Technologies

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SP6138EB

Evaluation Board Manual

Signal Processing Technologies 

The simple guidelines for positioning the poles and zeros and for calculating the

component values for a Type III compensation scheme are as follows:

Where ZSF=(f compensation double zero)/(f circuit double pole)

Here ZSF is set at 1.2.

As a particular example, consider for the following SP6138EB, 3AMAX with a type III

Voltage Loop Compensation component selections:

Vin_max = 15V

Vout = 3.30V @ 0 to 3A load

Select L = 2.2 uH => 15% current ripple.

Select Cout = 22uF Ceramic capacitors (Resr ≈ 5mΩ)

fs = 2500KHz SP6138ER1 internal Oscillator Frequency

Vramp_pp = 1.0V SP6138ER1 internal Ramp Peak-to-Peak Amplitude

Aug 24-06

SP6138 Evaluation Manual

Page 6 of 9

©2006 Sipex Corporation

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