SC2447 Ver la hoja de datos (PDF) - Semtech Corporation

Número de pieza

componentes Descripción

fabricante

SC2447

Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

Semtech Corporation 

POWER MANAGEMENT

Block Diagram

SC2447

SYNC

6

ROSC

3

COMP1

5

IN1

4

REF

8

CS1+

1

CS1-

2

OSCILLATOR

CLK

CLK2

FREQUENCY

DIVIDER CLK1

SLOPE COMP.

-

+ EA1

+

REFSS1

+

ISEN1

-

SLOPE1

+

+

Σ

50mV

+

ILIM1+

-

SLOPE2

-

PWM1

+

CLK1

OC1

SSL1

REFOUT

9

0.5V

1.25V

REFERENCE

R

Q

S

TGON1

UV

0.5V

PRE-BIAS

SOFT-START

&

OVERLOAD

HICCUP

CONTROL 1

OL1

DSBL1

SS1/EN1

1.25V

2R

R

TRI-STATE1

UVLO

4.3/4.5V

COMP2

11

IN2

12

REFIN

10

2.5V

-

+

-

+ EA2

+

CS2+

14

CS2-

13

REFSS2

+

ISEN2

-

SLOPE2

+

+

Σ

50mV

+

ILIM2+

-

SEL

ANALOG

SWITCH

-

PWM2

+

CLK2

R

Q

S

TGON2

UV

CLK2

OC2

SSL2

PRE-BIAS

SOFT-START

&

OVERLOAD

HICCUP

CONTROL 2

OL2

DSBL2

SS2/EN2

BA

MUX

Y

TRI-STATE2

R

2R 1.25V

REFSS2

AVCC

16

GDH1

25

GDL1

24

SS1/EN1

28

AGND

7

GDH2

20

GDL2

21

SS2/EN2

15

© 2006 Semtech Corp.

Figure 3. SC2447 Block Diagram

11

www.semtech.com

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