NCP81046

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9

b.. Output Filter Double Pole Frequency

1

c.. ESR Zero Frequency:

1

Step 1: Set a value for R1 between 2 k

W and 5 kW

R1 :+ 4.12 kW

Step 2: Pick compensation DC gain (R2/R1) for desired

close loop bandwidth.

R2 :+ R1 @

@

R2 + 17.085 kW

Step 3: Place 1st zero at half the output filter double pole

frequency.

C2 :+

R2

C2 + 7.024

Step 4: Place 1st pole at ESR zero frequency.

C1 :+

C2

C1 + 1.542

frequency.

R3 :+

R1

* 1

R3 + 74.169 W

C3 :+

1

C3 + 0.014 mF

Step 7: R4 is sized to maintain the feedback voltage to

R4 :+

R4 + 3.878 kW

The Component values for Type III Compensation are:

R1 = 4.12 k

W

R2 = 17.085 k

W

R3 = 74.169

W

R4 = 3.878 k

W

C1 = 0.0015

mF

C2 = 0.007

mF

C3 = 0.014

mF

NOTE: Recommend to change values to industry

standard component values.