Linear LT1943 Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 620

HIGH CURRENT QUAD OUTPUT SWITCHING REGULATORS FOR TFT-LCD PANELS

LT1943

DESCRIPTION

Demonstration circuit 620 is a quad output power

supply intended for use in large TFT-LCD panels. The

circuit features the LT®1943 high current quad-output

switching regulator and generates a 3.3V logic supply

along with the triple output supply required for the

TFT-LCD panels. With an input voltage range of 8V to

20V, a step down regulator provides 3.3V VLOGIC with

up to 2A current; a high power SEPIC converter, a

lower power boost converter and an inverting

converter provide three independent output voltages

AVDD, VON and VOFF required by the LCD panels. A high

side PNP provides delayed turn on of the VON signal

and can source up to 30mA at 30V.

All four switchers are synchronized to the internal

1.2MHz clock, allowing the use of low profile

inductors and ceramic capacitors. They all have soft-

start to limit start-up inrush current.

Long wires run from input sources (such as wall

adaptors) can cause large voltage spikes during initial

plug-in. C17 is installed on DC620 to damp the

possible voltage spikes. C17 is not required for

applications when input source is close to the

regulator. Please refer to Application Note 88 for

details.

Design files for this circuit board are available.

Call the LTC factory.

LT is a registered trademark of Linear Technology Corporation

Table 1. Performance Summary (TA= 25°C unless otherwise noted)

PARAMETER CONDITION VALUE

Minimum Input Voltage -40°C to 85°C 8V

Maximum Input Voltage -40°C to 85°C 20V

Output Voltage VLOGIC V

IN = 8V to 20V, IOUT = 0A to 2A 3.3V ±3%

Maximum Output Current at VLOGIC V

IN = 8V to 20V (Note 1) 2A

Typical Output Ripple VLOGIC V

IN = 12V, load at VLOGIC = 2A (20MHz BW) 23mVP–P

Typical Output Ripple AVDD V

IN = 12V, load at AVDD = 500mA (20MHz BW) 64mVP–P

Typical Switching Frequency 1.2MHz

Logic Low Voltage-Off, -40°C to 85°C 0.4V MAX

On/Off Control

Logic High Voltage-On 2.4V MIN

Note 1: 2A maximum output current is guaranteed when VOFF is unloaded. Since VOFF is supplied from VLOGIC, the load at VOFF reduces the available cur-

rent at VLOGIC. More output current is available at higher input voltage. Please refer to the LT1943 data sheet for output current vs. input voltage

curve.

QUICK START PROCEDURE

Demonstration circuit 620 is easy to set up to

evaluate the performance of the LT1943. Refer to

Figure 1 for proper measurement equipment setup

and follow the procedure below:

NOTE: When measuring the input or output

voltage ripple, care must be taken to avoid a long

ground lead on the oscilloscope probe. Measure

the input or output voltage ripple by touching the

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 620

HIGH CURRENT QUAD OUTPUT SWITCHING REGULATORS FOR TFT-LCD PANELS

probe tip directly across the VIN or VOUT and

GND terminals. See Figure 2 for proper scope

probe technique.

Make sure the input voltage does not exceed 20V.

With power off, connect the input power supply to

VIN and GND.

Turn on the power at the input.

Check for the proper output voltages. If there is no

output, temporarily disconnect the load to make

sure that the load is not set too high.

Once the proper output voltages are established,

adjust the loads within the operating range and ob-

serve the output voltage regulation, ripple voltage,

efficiency and other parameters.

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

VIN

GND

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 620

HIGH CURRENT QUAD OUTPUT SWITCHING REGULATORS FOR TFT-LCD PANELS

D D

C C

B B

A A

Vin

8-20V

Voff

-10V@50mA

RUNSS

Vlogic

3.3V@2A

Von

30V@30mA

PGOOD

AVdd

13V@500mA

GND

Voff unloaded

DC620A

Friday, September 12, 2003

June Wu 10/11/02

Gary Shockey 10/11/02

Switching Regulator For TFT-LCD Panels

LT1943EFE, High Current Quad Output

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

ZHCS400

10uH

R15

100K

LT1943EFE

15 16 21

10932

FB4

SW4

RUNSS

BIAS

BOOST

SS234

NFB4

VIN VIN SW3

SW1

FB1

SW2

FB2

PGOOD

VON

FB3

GND

SGND

GND

VC4VC3VC2VC1

80.6K

C19

opt.

C26

1uF

10V

C10

2.2uF

35V

C20

100pF

10K

10uF

25V

CMDSH-3

C12

2200pF

C13

680pF

10uH

2.2uF

10V

C14

2200pF

10uH

C22

100pF

R14

opt.

C18

opt.

232K

0.015uF

0.22uF

10V

B240A

C23

100pF

0.47uF

16V

4.7uH

R10

18K

C25

1uF

16V

C17

47uF

35V

95.3K

33uH

E10

10uF

16V

10K

C21

100pF

E11

B230A

10K

R11

6.8K

16.2K

R12

27K

R13

13K

0.047uF

C15

0.47uF

35V

C16

1.0uF

25V

C24

10pF

10K

0.015uF

C11

2200pF

ZHCS400

22uF

6.3V

Linear Technology Corporation

LT1943EFE

Bill Of Material

Demo Bd. #620A

6/17/2005

Item Qty Reference Part Description Manufacture / Part #

1 1 C1 CAP., X5R, 10uF, 25V, 20% 1210 Taiyo Yuden, TMK325BJ106MM

2 1 C8 CAP., X5R, 10uF, 16V, 20% 1210 Taiyo Yuden, EMK325BJ106MN

3 1 C2 CAP., X5R, 22uF, 6.3V, 20% 1206 Taiyo Yuden, JMK316BJ226ML

4 1 C3 CAP., X7R, 0.22uF, 10V, 20% 0603 AVX, 0603ZC224MAT2A

5 2 C5,C4 CAP., X7R, 0.015uF, 16V, 20%, 0402 AVX, 0402YC153MAT2A

6 1 C6 CAP., X7R, 2.2uF, 10V, 10% 0805 MuRata, GRM21BR71A225KA01L

7 1 C7 CAP., X5R, 0.47uF, 16V, 20% 0603 AVX, 0603YD474MAT2A

8 1 C9 CAP., X5R, 0.047uF, 16V, 10% 0402 AVX, 0402YD473KAT2A

9 1 C10 CAP., X5R, 2.2uF, 35V, 20% 1210 Taiyo Yuden, GMK325BJ225MN

10 3 C11,C12,C14 CAP., X7R, 2200pF, 50V, 20% 0402 AVX, 04025C222MAT2A

11 1 C13 CAP., X7R, 680pF, 50V, 20% 0402 AVX, 04025C681MAT2A

12 1 C15 CAP., X5R, 0.47uF, 35V, 20% 0805 Taiyo Yuden, GMK212BJ474MG

13 1 C16 CAP., X5R, 1.0uF, 25V, 10% 0805 AVX, 08053D105KAT2A

14 1 C17 CAP., TANT, 47uF, 35V, 20% 7343 AVX, TAJE476M035R

15 4 C20-C23 CAP., X7R, 100pF, 50V, 20%, 0402 AVX, 04025C101MAT2A

16 0 C18,C19 (OPT.) CAP., 0402

17 1 C24 CAP., NPO, 10pF, 50V, 10% 0402 AVX, 04025A100KAT2A

18 1 C25 CAP., X5R, 1.0uF, 16V, 20% 0805 TAIYO YUDEN, EMK212BJ105MG

19 1 C26 CAP., X7R, 1.0uF, 10V, 20% 0805 TAIYO YUDEN, LMK212BJ105MG

20 1 D1 Schottky Barrier REC., B230A SMA Diodes Inc., B230A

21 1 D2 Schottky Diode, CMDSH-3 SOD-323 CENTRAL SEMI., CMDSH-3-LTC

22 2 D3,D6 Schottky Barries Dio., ZHCS400, SOD-323 ZETEX, ZHCS400

23 1 D5 Schottky Barrier REC., B240A SMA Diodes Inc., B240A

24 11 E1-E11 TURRET, MILL-MAX, 2501-2

25 1 L1 INDUCTOR, 4.7uH RLF7030 TDK, RLF7030T-4R7M3R4

26 2 L2,L3 INDUCTOR, 10uH SLF6028 TDK, SLF6028T-100M1R3

27 1 L4 INDUCTOR, 10uH RLF5018 TDK, RLF5018T-100MR94

28 1 L6 INDUCTOR, 33uH RLF5018 TDK, RLF5018T-330MR51

29 1 R10 RES., CHIP, 18K, 1/16W, 5% 0402 AAC, CR05-183JM

30 1 R11 RES., CHIP, 6.8K, 1/16W, 5% 0402 AAC, CR05-682JM

31 4 R1,R5,R8,R4 RES., CHIP, 10K, 1/16W, 1% 0402 AAC, CR05-1002FM

32 1 R12 RES., CHIP, 27K, 1/16W, 5% 0402 AAC, CR05-273JM

33 1 R13 RES., CHIP, 13K, 1/16W, 5% 0402 AAC, CR05-133JM

34 1 R2 RES., CHIP, 16.2K, 1/16W, 1% 0402 AAC, CR05-1622FM

35 1 R3 RES., CHIP, 80.6K, 1/16W, 1% 0402 AAC, CR05-8062FM

36 1 R6 RES., CHIP, 95.3K, 1/16W, 1% 0402 AAC, CR05-9532FM

Page 1 - of - 2

Linear Technology Corporation

LT1943EFE

Bill Of Material

Demo Bd. #620A

6/17/2005

Item Qty Reference Part Description Manufacture / Part #

37 1 R9 RES., CHIP, 232K, 1/16W, 1% 0402 AAC, CR05-2323FM

38 1 R15 RES., CHIP, 100K, 1/16W, 5% 0603 AAC, CR16-104JM

39 0 R14 (OPT.) RES., CHIP, 0402

40 1 U1 (Tape & Reel) I.C.LT1943EFE, TSSOP28FE LINEAR., LT1943EFE

41 1 PRINTED CIRCUIT BOARD DEMO CIRCUIT #620A

Page 2 - of - 2

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DC620A

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