US3012A Ver la hoja de datos (PDF) - Unisem

Número de pieza

componentes Descripción

Lista de partido

US3012A

5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC

Unisem 

US3012/3012A

TYPICAL APPLICATION

SYNCHRONOUS OPERATION

(Dual Layout with RC5051)

L1

Q1

5V

L2

R8

C5

R2

R4

R7

R9

C1

C7

C3

Q2

R6

R3

R5

C11

R1

12V

C2

VID4

VID3

VID2

VID1

VID0

C4

C6

D1

13

6

V12 V5

7 NC/Vccp

16 SS/Vref

D4

D3

8

17

R10

4

CS+

D2

18

12

5

HDrv CS-

US3012

D1

D0

19

20

9

LDrv

10

Gnd

R11

14

Vfb/

GndD

En 2

NC/ NC/

GndP GndA

11

15

PGd 3

Ct

1

C8

3012app1-1.1

R12

R13

OutEn

Power Good

C9

C10

Typical application of US3012/3012A in an on board DC-DC converter providing the Core supply for the Pentium II

microprocessor.

Table of components that need to be modified to make the dual layout work for US3012A* and RC5051.

Part # R1 R2 R4 R7 R8

RC5051 V

O

O

V

V

US3012A* S

V

S

O

S

R9 R10 R11 C2 C5 C8 D1

V

O

S

V

O

V

V

O

V

O

V

V

V

O

S - Short

O - Open

V - See Unisem or Raytheon parts list for the value.

* Table also applies to the none "A" version of the part.

Note 1 : R8 can be replaced with shorting wire of #20 AWG or lower. This elliminates the expensive current

sense resistor that otherwise is needed with RC5051.

4-6

Rev. 1.0

5/6/98

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