SP6132H データシートの表示（PDF） - Signal Processing Technologies

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SP6132H

High Voltage, 300KHz Synchronous PWM Controller

Signal Processing Technologies 

APPLICATIONS INFORMATION: Continued

The goal of loop compensation is to manipulate

loop frequency response such that its gain crosses

over 0db at a slope of -20db/dec. The first step

of compensation design is to pick the loop

crossover frequency. High crossover frequency

is desirable for fast transient response, but often

jeopardizes the system stability. Crossover fre-

quency should be higher than the ESR zero but

less than 1/5 of the switching frequency. The

ESR zero is contributed by the ESR associated

with the output capacitors and can be deter-

mined by:

When the output capacitors are of a Ceramic

Type, the SP6132H requires a Type III compen-

sation circuit to give a phase boost of 180° in

order to counteract the effects of an under damped

resonance of the output filter at the double pole

frequency.

Gain

(dB)

Condition:

C22 >> CP1, R1 >> RZ3

Error Amplify Gain

Bandwidth Product

ƒZ(ESR) =

1

2π COUT RESR

The next step is to calculate the complex conju-

gate poles contributed by the LC output filter,

ƒP(LC) =

1

2π L COUT

20 Log (RZ2/R1)

Frequency

(Hz)

Bode Plot of Type III Error Amplify Compensation.

Date:2/14/06

SP6132H High Voltage, Synchronous PWM Controller

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© Copyright 2006 Sipex Corporation

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