SC2441A(2006) Просмотр технического описания (PDF) - Semtech Corporation

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Компоненты Описание

производитель

SC2441A
(Rev.:2006)

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

SC2441A

POWER MANAGEMENT

Block Diagram

EXT CLOCK

BUFFER

SYNC/SHDN

6

XCLK

PHASE /

QU

FREQUENCY

DETECTOR

QD

CKOUT

QT

28

QT

1.5V

INTERNAL

CLAMP

IPLLF

1K

S1

PLLF

2

CURRENT-

CONTROLLED

OSCILLATOR

S2

IPLLF

R1

C2

C1

EXTERNAL PLL

COMPENSATION

0.4V

V/I

R2

OPTIONAL

RESISTOR FOR

SETTING PHASE

SHIFT

ROSC

10

ROSC

SETS FREE -

RUNNNG

FREQUENCY

TOGGLE

FLIP-FLOP

CLK

CLK1 CLK2

(a)

CLK

XCLK

QT

QT

CKOUT

CLK1

CLK2

GDH1

GDH2

(b)

Figure 5. Phase-Locked Loop (a) and Its Timing Diagram in Locked Condition (R2 not Used) (b).

 2006 Semtech Corp.

10

www.semtech.com

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