Texas Instruments LM2745-19A Скачать руководство пользователя страница 8

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R12

R15

C10

R10

C11

C14

R17

R11

R16

BOO

PGND

PWGD

FREQ/SYNC

SS/TRACK

SGND

EAO

PGND

LM2745

OUT

LM2937

C13

OUT

GND

C12

R18

SYNC

R14

R13

TRACK

SJ2

PWGD

TRIM

SENSE

SJ1

SEN

PCB Layout

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Figure 11. 300 kHz Demo Board Schematic

PCB Layout

Figure 12. Top Silkscreen

AN-1573 LM2745-19A Demonstration Board

SNVA213A – May 2007 – Revised May 2013

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Содержание LM2745-19A

Страница 1: ...V to 3 3V at 19A with a switching frequency of 300 kHz Note the demo board is optimized for the above parameters thus for additional design modifications refer to the Design Consideration section of the LM2745 data sheet The PCB is designed on four layers the top and bottom layers are 2oz copper and the two inner layers are 1oz copper The board measures 2 19 in x 1 03 in x 0 41 in 56 mm x 26 2 mm ...

Страница 2: ... frequency synchronize range 250 kHz to 1 MHz Current Limit Protection Master power supply start up tracking function Start up with a pre biased output load Adjustable soft start Small size 2 19 in x 1 03 in x 0 41 in 56 mm x 26 2 mm x 10 3 mm 5 Performance Characteristics Efficiency Figure 2 Efficiency vs Load Current VOUT 3 3V fSW 300 kHz 2 AN 1573 LM2745 19A Demonstration Board SNVA213A May 200...

Страница 3: ...le Figure 3 VIN 8V VOUT 3 3V ILOAD 100 mA fSW 300 kHz 20 MHz Bandwidth Limit Figure 4 VIN 8V VOUT 3 3V ILOAD 19A fSW 300 kHz 20 MHz Bandwidth Limit 3 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 4: ...3 3V ILOAD 100 mA fSW 300 kHz 20 MHz Bandwidth Limit Figure 6 VIN 14V VOUT 3 3V ILOAD 19A fSW 300 kHz 20 MHz Bandwidth Limit 4 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 5: ...Transient Response Figure 7 VIN 14V VOUT 3 3V ILOAD 2A to 10A CH1 VOUT CH2 ILOAD Figure 8 VIN 14V VOUT 3 3V ILOAD 11A to 19A CH1 VOUT CH2 ILOAD 5 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 6: ...ti com Figure 9 VIN 8V VOUT 3 3V ILOAD 2A to 10A CH1 VOUT CH2 ILOAD Figure 10 VIN 8V VOUT 3 3V ILOAD 11A to 19A CH1 VOUT CH2 ILOAD 6 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 7: ... Murata C7 GRM1885C1H101JA01 Ceramic Capacitor 0603 100pF 50V C0G 5 1 Murata C8 GRM188R71H332KA01 Ceramic Capacitor 0603 3 3nF 50V X7R 10 1 Murata C10 GRM188R71H153KA01 Ceramic Capacitor 0603 15nF 50V X7R 10 1 Murata C12 GRM40X7R472K25 Ceramic Capacitor 0805 470nF 25V X7R 10 1 Murata C13 12066D226MAT Ceramic Capacitor 1206 22µF 6 3V X5R 20 1 AVX C4 5 6SVPC220M OS CON C6 220µF 6 3V 20 2 Sanyo R1 18...

Страница 8: ...N C13 VOUT GND C12 D1 Q2 SD R6 R5 R7 R8 R9 R18 U1 U2 C7 SYNC R14 R13 TRACK SJ2 PWGD SD TRIM SENSE SJ1 VCC ISEN PCB Layout www ti com Figure 11 300 kHz Demo Board Schematic 9 PCB Layout Figure 12 Top Silkscreen 8 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 9: ... Top Copper Layer Figure 14 Bottom Silkscreen Figure 15 Bottom Copper Layer 9 SNVA213A May 2007 Revised May 2013 AN 1573 LM2745 19A Demonstration Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 10: ...e 16 Internal Layer 1 GND Copper Figure 17 Internal Layer 2 GND Copper 10 AN 1573 LM2745 19A Demonstration Board SNVA213A May 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 11: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Страница 12: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments LM2745 19AEVAL ...

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