APU3048_16 datasheet(9/16 Pages) A-POWER

Part #	APU3048

Description	SYNCHRONOUS PWM CONTROLLER WITH OVER CURRENT PROTECTION

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Manufacturer	A-POWER [Advanced Power Electronics Corp.]

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Advanced Power

Electronics Corp.

APU3048

9

As known, transconductance amplifier has high

impedance (current source) output, therefore, consider

should be taken when loading the E/A output. It may

exceed its source/sink output current capability, so that the

amplifier will not be able to swing its output voltage over the

necessary range.

The compensation network has three poles and two

zeros and they are expressed as follows:

FLC1 = 2.8KHz

R8 = 1K

R6 = 1.64K

gm = 600umho

For:

VIN1 = 12V

VOSC = 1.25V

FO1 = 30KHz

FESR1 = 26.5KHz

This results to R9=46.4KΩ; Choose R9=46.4KΩ

To cancel one of the LC filter poles, place the zero

be-fore the LC filter resonant frequency pole:

For:

L3 = 10.2uH

Co = 300uF

Fz = 2.1KHz

R9 = 46.4KΩ

Using equations (11) and (13) to calculate C9, we get:

C9 = 1630pF; Choose C9 = 1800pF

We get:

R11 = 38.9KΩ; Choose R11 = 39.2KΩ

C19 = 1554pF; Choose C19 = 1800pF

One more capacitor is sometimes added in parallel

with C9 and R4. This introduces one more pole which is

mainly used to supress the switching noise. The

additional pole is given by:

The pole sets to one half of switching frequency which

results in the capacitor CPOLE:

For a general solution for unconditionally stability

for any type of output capacitors, in a wide range of

ESR values we should implement local feedback with a

compensation network. The typically used

compensation network for voltage-mode controller is

shown in Figure 7.

Figure 7 - Compensation network with local feedback

and its asymptotic gain plot.

In such configuration, the transfer function is given by:

The error amplifier gain is independent of the

transconductance under the following condition:

By replacing ZIN and Zf according to figure 7, the

transformer function can be expressed as:

.

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