SC2441ITSTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC2441ITSTRT

Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

SC2441

POWER MANAGEMENT

Applications Information (Cont.)

In Figure 17, Co3 and Resr3 are the capacitance and the

ESR of the output capacitor, gm3 is the error amplifier

transconductance and k3 is the current loop gain. If one

specifies the loop crossover frequency fc, the

compensation component values are readily calculated

as

Bode plots of the loop response are shown in Figure 18.

C4

=

h3gm3k

3

(1

−

D3

)

Ro3

2

| 1−

fc

fz1

|

1

2πfc

Resr 3

,

Resr3 + 0.5Ro3

and

R4

=

1

C4

Co3 (Resr3

+

Ro3

2

)

with

C5

=

C4

2R esr 3

Ro3

fz1

=

(1− D3 )2Ro3

2πL3

.

Figure 18. Typical loop transfer function Bode plot of

the Boost converter.

 2005 Semtech Corp.

26

www.semtech.com

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