SC2440 Просмотр технического описания (PDF) - Semtech Corporation

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производитель

SC2440

2.5 MHz Dual Switching Regulator with Integrated 2A Switches

Semtech Corporation 

SC2440

POWER MANAGEMENT

Block Diagrams

PGOOD1

14

COMP1

15

FB1

16

SS1

13

-

+

POWER

GOOD

100mV

-

EA

+

+

PWM

-

+

Σ

+

SLOPE

COMP 1

+

ISEN

-

+

ILIM

-

20mV

BOOST1

1

3 IN

7.7mΩ

S

Q

R

POWER

TRANSISTOR

FB1

2 SW1

Soft-Start

1V

0.74V

And

O ve rloa d

OVLD

SS2

REFERENCE

& THERMAL

FAULT

Hiccup

Control 1

12

SHUTDOWN

SLOPE SLOPE

COMP 1 COMP 2

ROSC

5

SYNC

4

OSCILLATOR

SLOPE COMP

CLK1

FREQUENCY

DIVIDER CLK2

Figure 2. SC2440 Functional Diagram (One of Two Converters Shown)

FB

0.74V

SS

+

-

1.8µA

1V/2 V

S

Q

R

OVLD

FAULT

2.6µA

Figure 3. Details of the Soft-Start and Overload Hiccup Control Circuit

© 2005 Semtech Corp.

5

www.semtech.com

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