RT9228 Ver la hoja de datos (PDF) - Richtek Technology

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RT9228

Advanced PWM and Dual Fixed Linear Power Controller

Richtek Technology 

RT9228

Typical Application Circuit

12V

5V

GND

L1

F1

1uH

15A

C1-4

4 x 1000uF

R1

10

C5-6

2 x 1uF

3.3V

VOUT3

1.5V

VOUT2

2.5V

Q3

RFD3055

C9

1000uF

C10

270uF

C20

1uF

1

VCC

12 VIN2

OSET1 20

C8

1000uF

PGOOD 7

15 GATE3

16 FB3

UGATE1

PHASE2

24

23

RT9228

13 VOUT2 LGATE1 22

11 FB2

PGND 21

6 VID0

5 VID1

4 VID2

3 VID3

2 VID4

19

VSEN1

FB1 18

FAULT 8

SS 9

GND

14

C7

1000pF

R2

1.21K

Q1

PHB83N03LT

Q2

PHB95N03LT

C12

0.039uF

POWERGOOD

R3

10K

L2

3.5uH

R4

4.99K

C13-19

7 x 1000uF

C11

R5 0.68uF

732K

VOUT1

1.3V to 3.5V

Function Block Diagram

VSEN1

OCSET1

VCC

FB3

GATE3

VIN2

VOUT2

FB2

FAULT

3.3V

-

0.3V

+

+

-

+

+

- 1.26V

-

+ OC2

0.25A -

Soft Start

& Fault Logic

VCC

11uA

5V

DACOUT

TTL D/A

Converter

(DAC)

110%

90%

115%

+

-

+

-

+ Over Voltage

-

Power-On 3.3V

Reset (POR)

VCC

OC1

+

-

Inhibit

PWM

Comparator

+

+

PWM

-

-

Error

Amplifier

Gate

Control

Logic

VCC

Oscillator

Compensation

Lower

Drive

PGOOD

UGATE1

PHASE1

LGATE1

PGND

GND

SS

FB1

www.richtek.com

2

DS9228-06 March 2007

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