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Turn-off Sequencing

www.ti.com

9

Turn-off Sequencing

1. Switch ENABLE, BOOST_GATE and VCON to 0V.

2. Turn off VBATT supply.

10

Bottom Layer Test and Jumper Pairs

The signals below may be monitored by attaching scope probes or clip leads to the corresponding pins.
The dotted pin is the signal. The adjacent (undotted) is the ground pin.

Test Points:

•

PVIN BST - Boost input node (VBATT connection)

•

SW BST - Boost switch node

•

BST_OUT - Boost output node

•

SW BUCK - Buck switch node

•

BK OUT - Buck output note

Jumpers (see

Figure 8

for locations):

•

LBST - Boost inductor jumper

•

L BUCK - Buck inductor jumper

•

ACB - ACB jumper

6

LM3248 2.7MHz, 2.5A Boost-Buck DC/DC Converter Evaluation Module

SNAA196 – September 2013

Submit Documentation Feedback

Copyright © 2013, Texas Instruments Incorporated

Содержание LM3248

Страница 1: ...Using the LM3248 Evaluation Module User s Guide Literature Number SNAA196 September 2013 All trademarks are the property of their respective owners ...

Страница 2: ...ides the RF power subsystem the capability to operate at lower battery voltages as well as increased PA linearity and transmit power margins over a wider battery voltage supply range This application note contains information specific to the evaluation board For device details and electrical characteristics please refer to the LM3248 data sheet If you are considering using the LM3248 in a system d...

Страница 3: ...Black Machine Screw Roun 4 B F Fastener H1 H2 H3 H4 4 40 x 1 4 Nylon Philips NY PMS 440 0025 PH Digi Key Supply panhead Standoff Hex 0 5 L 4 40 H5 H6 H7 H8 4 Keystone 1902C Digi Key x 1 4 Nylon Inductor Shielded Metal L1 1 Composite 1µH 2 6A Toko 1276AS H 1R0N See Mfr 0 062Ω 3225 Inductor Shielded Metal L3 1 Composite 1 5µH 1 6A Toko 1285AS H 1R5M See Mfr 0 144Ω 2016 Header shrouded 100 mil TE P1 ...

Страница 4: ...igi Key 0402 Not installed 3 5A Ferrite FB1 FB2 2 Bead 60Ω 100MHz TDK MPZ1608S600A Digi Key Mouser SMD 6 LM3248 Evaluation Module Photo Figure 1 LM3248 Evaluation Board 4 LM3248 2 7MHz 2 5A Boost Buck DC DC Converter Evaluation Module SNAA196 September 2013 Submit Documentation Feedback Copyright 2013 Texas Instruments Incorporated ...

Страница 5: ...sure the signal sources are first set to 0V NOTE BOOST_GATE is a logic level signal see the LM3248 data sheet which represents the TTI frame interval A pulse or function generator should be used to drive this pin but should be configured to drive a high impedance load so that the level seen on the instrument panel is the same as that measured into a high Z load 50Ω mode will put out 2X the indicat...

Страница 6: ... the signal The adjacent undotted is the ground pin Test Points PVIN BST Boost input node VBATT connection SW BST Boost switch node BST_OUT Boost output node SW BUCK Buck switch node BK OUT Buck output note Jumpers see Figure 8 for locations LBST Boost inductor jumper L BUCK Buck inductor jumper ACB ACB jumper 6 LM3248 2 7MHz 2 5A Boost Buck DC DC Converter Evaluation Module SNAA196 September 2013...

Страница 7: ...n Board Layout Figure 2 Top Layer Figure 3 Bottom Layer Figure 4 Mid Layer 1 Figure 5 Mid Layer 2 7 SNAA196 September 2013 LM3248 2 7MHz 2 5A Boost Buck DC DC Converter Evaluation Module Submit Documentation Feedback Copyright 2013 Texas Instruments Incorporated ...

Страница 8: ...rd Layout www ti com Figure 6 Mid Layer 3 Figure 7 Mid Layer 4 Figure 8 Bottom Layer Mirrored 8 LM3248 2 7MHz 2 5A Boost Buck DC DC Converter Evaluation Module SNAA196 September 2013 Submit Documentation Feedback Copyright 2013 Texas Instruments Incorporated ...

Страница 9: ...LM3248 Evaluation Board Layout Figure 9 Stackup 9 SNAA196 September 2013 LM3248 2 7MHz 2 5A Boost Buck DC DC Converter Evaluation Module Submit Documentation Feedback Copyright 2013 Texas Instruments Incorporated ...

Страница 10: ... 0201 C3 1000pF 0201 C9 0402 10µF C1 10µF 0402 C7 1 2 DNI FB1 DNI 1000pF 0201 C34 GND 0201 0 01µF C20 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND BG MODE 499 0201 R6 499 0201 R7 499 0201 R3 01005 3300pF C16 GND 1µF 0201 C18 01005 3300pF C19 2 2µF 0402 C21 DNI 4 7µF 0402 C17 DNI 0 DNI 0402 R2 1 2 OUT_BST 1 2 LBST 1 2 ACB 1 2 VCON_S 1 2 L BUCK 470µF C5 BUCK_OUT 1 2 BST_OUT 1 2 SW BST...

Страница 11: ... BOOST PVIN_ BOOST OUT_ BOOST FB_ BUCK SW_ BUCK NC ENABLE PVIN_ BOOST MODE ACB DGND PVIN_ BUCK ACB SGND_ BUCK SW_ BOOST PGND VDD2_ BUCK PGND OUT_ BOOST 5 4 3 2 1 A B C D E F SW_ BOOST VDD1_ BUCK PGND VCON SW_ BUCK PVIN_ BUCK ATB1 ATB2 www ti com Connection Diagram 13 Connection Diagram Figure 10 Top View Bumps Down Figure 11 Bottom View Bumps Up 11 SNAA196 September 2013 LM3248 2 7MHz 2 5A Boost B...

Страница 12: ...CK when used with Boost C3 SGND_BUCK Analog Ground for the Buck Analog Blocks C4 C5 PGND Power Ground for output FETs F3 Input Chip enable Setting ENABLE High biases up the Buck and initiates D1 ENABLE I VCON regulation by the Buck D2 VCON I Analog voltage control input which controls Buck output voltage D3 NC No Connect leave this pin floating D4 SW_BUCK 0 Buck converter switch node for external ...

Страница 13: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Страница 14: ... by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la rég...

Страница 15: ... connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Страница 16: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Страница 17: ...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...

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