CM2500 查看數據表（PDF） - Champion Microelectronic

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CM2500

WIDE INPUT 2A STEP DOWN CONVERTER

Champion Microelectronic 

CM2500

WIDE INPUT 2A STEP DOWN CONVERTER

STEP 2. Set the zero fZ1 at 1/4 of the crossover frequency.

If RCOMP is less than 15kΩ, the equation for CCOMP is:

If RCOMP is limited to 15kΩ, then the actual cross over

frequency is 3.4 / (VOUTCOUT). Therefore:

STEP 3. If the output capacitor’s ESR is high enough to

cause a zero at lower than 4 times the crossover frequency,

an additional compensation capacitor CCOMP2 is required.

The condition for using CCOMP2 is:

RESRCOUT

And the proper value for CCOMP2 is:

Though CCOMP2 is unnecessary when the output capacitor

has sufficiently low ESR, a small value CCOMP2 such as

100pF may improve stability against PCB layout parasitic

effects. Table 2 shows some calculated results based on the

compensation method above.

Table 2. Typical Compensation for Different

Output Voltages and Output Capacitors

VOUT

2.5V

3.3V

5V

2.5V

3.3V

5V

2.5V

3.3V

5V

COUT

22μF Ceramic

22μF Ceramic

22μF Ceramic

47μF SP Cap

47μF SP Cap

47μF SP Cap

470μF/6.3V/30mΩ

470μF/6.3V/30mΩ

470μF/10V/30mΩ

RCOMP

8.2kΩ

12kΩ

15kΩ

15kΩ

15kΩ

15kΩ

15kΩ

15kΩ

15kΩ

CCOMP

2.2nF

1.5nF

1.5nF

1.5nF

1.8nF

2.7nF

15nF

22nF

27nF

CCOMP2

None

None

None

None

None

None

1nF

1nF

None

2008/04/15 Rev1.0

Champion Microelectronic Corporation

Page 8

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