SP7662_07 datasheet(13/19 Pages) SIPEX

No. de pieza	SP7662

Descripción Electrónicos	Wide Input Voltage Range 12A, 300kHz, Buck Regulator

PDF	19 Pages

Scroll/Zoom	100%

Fabricante Electrónico	SIPEX [Sipex Corporation]

Página de inicio	http://www.sipex.com

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13 / 19 page

Mar -07 Rev AJ

SP7662 Wide Input Voltage Range 2A, 300kHz Buck Regulator

Bode Plot of Type III Error Amplifier Compensation.

Frequency

(Hz)

Error Amplifier

Gain Bandwidth Product

Condition:

C22 >> CP1, R1 >> RZ3

20 Log (RZ2/R1)

Gain

(dB)

60kHz. The ESR zero is contributed by the

ESR associated with the output capacitors

andcanbedeterminedby:

ƒZ(ESR) =

2π• COut • ReSr

The next step is to calculate the complex

conjugate poles contributed by the LC

outputfilter,

ƒP(LC) = .

2π•

√ L • COut

When the output capacitors are of a Ceramic

Type,theSP7662EvaluationBoardrequires

aTypeIIIcompensationcircuittogiveaphase

boostof80°inordertocounteracttheeffects

of an underdamped resonance of the output

filteratthedoublepolefrequency.

CP1

RZ2

CZ2

VFB

COMP

- 0.8V

CF1

VOUT

68.1kΩ, 1%

RSET

CZ3

RZ3

RSET =

54.48 (kΩ)

(VOUT -0.8)

Type III Error Amplifier Compensation Circuit

APPLICATIONS INFORMATION

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