Using the LM2775EVM Evaluation Module
User's Guide
Literature Number: SNVU469A
May 2015 – Revised June 2018
Contents
1
2
3
4
5
Introduction ......................................................................................................................... 4
Setup .................................................................................................................................. 4
2.1
Input/Output Connector Description ................................................................................... 4
2.2
Setup ....................................................................................................................... 5
2.3
Operation .................................................................................................................. 5
Board Layout ....................................................................................................................... 5
Schematic ........................................................................................................................... 8
Bill of Materials .................................................................................................................... 9
Revision History ........................................................................................................................... 9
2
Table of Contents
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List of Figures
1
Enable Jumper Settings..................................................................................................... 4
2
Jumper Configuration
3
4
5
.......................................................................................................
Top Assembly Layer.........................................................................................................
Bottom Assembly Layer (UNMIRRORED) ...............................................................................
LM2775EVM Schematic ....................................................................................................
5
6
7
8
List of Tables
1
Device and Package Configurations ...................................................................................... 4
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List of Figures
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3
User's Guide
SNVU469A – May 2015 – Revised June 2018
LM2775EVM User's Guide
1
Introduction
The Texas Instruments LM2775EVM evaluation module (EVM) helps designers evaluate the operation
and performance of the LM2775 switched capacitor 5-v boost converter. The device offers configurability
via two logic pins allowing or disallowing PFM operation at light loads and active discharge during
shutdown.
The EVM contains one LM2775 switched capacitor 5-V boost converter (See Table 1). For more details
and electrical characteristics of this device, see the LM2775 device data sheet (SNVSA57).
Table 1. Device and Package Configurations
2
FLASH LED DRIVER
IC
PACKAGE
U1
LM2775
WSON
Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the LM2775EVM.
2.1
Input/Output Connector Description
VIN / GND: These are the power input pins for the driver. The pins provide power (VIN) and ground
(GND) connections to allow the user to attach the EVM to a cable harness.
EN (J1): This is the jumper used to enable the boost converter (EN pin). The driver will be enabled when
the EN pin is high (+) and disabled when it is low (–).
PFM (J2): This jumper is used to enable and disable PFM mode. PFM mode will be allowed when the
PFM pin is high (+) and disabled when it is low (–).
OUTDIS (J3): This jumper is used to discharge the output during shutdown. Active discharge is enabled
when the OUTDIS pin is high (+) and disabled when it is low (–).
VOUT- This is the output pin for the LM2775EVM. Currents up to 200 mA can be drawn from this terminal
when the input voltage is higher than 3.1 V and lower than 5.5 V.
Figure 1. Enable Jumper Settings
4
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Setup
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2.2
Setup
The input voltage range for the flash driver is 2.7 V to 5.5 V.
2.3
Operation
For proper operation of the LM2775EVM, the jumpers should be properly configured. The recommended
setting, using shorting blocks is:
OUTDIS to +
PFM to +
EN to +
In this configuration, the device will power up when an input voltage is applied. Once running, current can
be pulled from the VOUT connector. Test points are provided for voltage measuring when current is drawn
from the LM2775EVM.
Figure 2. Jumper Configuration
3
Board Layout
Figure 3 and Figure 4 show the board layout for the LM2775EVM. The EVM offers capacitors and jumpers
to enable the device and to configure it as desired.
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Board Layout
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The LM2775 will dissipate power, especially during high current and high input voltage operation. The
EVM layout is designed to minimize temperature rise during operation.
NOTE: High frequency switching noise at the output can be minimized by adding a 0.1-µF ceramic
capacitor close to the output terminals (VOUT)
Figure 3. Top Assembly Layer
6
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Board Layout
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Figure 4. Bottom Assembly Layer (UNMIRRORED)
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7
Schematic
4
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Schematic
Figure 5. LM2775EVM Schematic
8
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Bill of Materials
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5
Bill of Materials
DESIGNATOR
DESCRIPTION
MANUFACTURER
PART NUMBER
QUANTIT
Y
U1
Switched Capacitor 5 V Boost Converter, DSG0008A
Texas Instruments
LM2775DSG
1
!PCB1
Printed Circuit Board
Any
SV601144
1
C1, C2
CAP, CERM, 10 µF, 10 V, +/- 20%, X5R, 0402
Samsung
CL05A106MP5NUNC
2
C3
CAP, CERM, 1 µF, 35 V, +/- 10%, JB, 0402
TDK
C1005JB1V105K050BC
1
C4
CAP, CERM, 10 µF, 10 V, +/- 20%, X5R, 0603
TDK
C1608X5R1A106M
1
J1, J2, J3
Header, 100mil, 3x1, Gold, TH
Samtec
TSW-103-07-G-S
3
J4
Standard Banana Jack, Insulated, Red
Keystone
6091
1
J5
BANANA JACK, 15A, Insulated, Nylon,Yellow
Emerson Network Power
108-0907-001
1
J6
Standard Banana Jack, Insulated, Black
Keystone
6092
1
SH-J1, SH-J2, SH-J3
Shunt, 100mil, Gold plated, Black
3M
969102-0000-DA
3
TP1
Test Point, Multipurpose, Red, TH
Keystone
5010
1
TP2
Test Point, Multipurpose, Yellow, TH
Keystone
5014
1
TP5, TP6
Test Point, Multipurpose, Black, TH
Keystone
5011
2
space
space
space
space
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (May 2015) to A Revision ........................................................................................................... Page
•
Added a note "High frequency switching noise at the output can be minimized by adding a 0.1-µF ceramic capacitor close
to the output terminals" ................................................................................................................... 6
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