Application Note: AS1345 - AN01 – Evaluation Board
Description
AS1345
AN01 – Evaluation Board Description
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Revision 1.1 / 2012/12/11
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AS1345 – AN01
Evalboard Description
Table of Contents
1
1.1
2
3
4
5
General Description ............................................................................................................. 3
Kit Content ........................................................................................................................... 3
Getting Started ..................................................................................................................... 3
Hardware Description........................................................................................................... 5
Board Schematics, Layout and BOM ................................................................................... 6
Ordering Information ............................................................................................................ 9
Revision History
Revision
1.0
1.1
Date
12.12.2012
11.01.2013
Owner
tka
tka
Description
Initial release
corrections
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AS1345 – AN01
Evalboard Description
1
General Description
This document describes the AS1345 Evaluation Board.
The AS1345 is a high efficient DCDC Step-up converter, which contains an internal N-channel and
an internal P-channel output isolation switch.
The device operates from a 2.9V to 5.0V supply and can boost voltages up to 18V.
1.1
Kit Content
The AS1345 Evaluation Kit includes only the AS1345 Evaluation Board
2
Getting Started
Drive the AS1345 DCDC Step-up converter only with the recommended settings and values as
described in the datasheet.
Please check
www.ams.com
for the latest version.
There are 4 different AS1345 Evaluation Board versions available.
•
•
•
•
AS1345A – AD with 100mA peak inductor current and adjustable Vout
AS1345B – AD with 200mA peak inductor current and adjustable Vout
AS1345C – AD with 350mA peak inductor current and adjustable Vout
AS1345D – AD with 500mA peak inductor current and adjustable Vout
All Evaluation Boards have a resistive divider on the PCB to adjust the Vout.
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AS1345 – AN01
Evalboard Description
With the equation
Vout = V
REF
* (1+R1/R2)
it´s possible to calculate the right resistor values to get
the desired Vout.
V
REF
= 1.25V
On all Evaluation Boards the output voltage is adjusted to 15V.
Connect a supply voltage (2.9V to 5.0V) between the connectors “Vin” and “GND”.
Set the “EN” jumper to “on” and the output gives the adjusted 15V.
~
~
If there are questions, please contact us.
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AS1345 – AN01
Evalboard Description
3
Hardware Description
Figure 1: Evaluation Board Connectors
A
B
C
G
F
D
E
Label
A
B
Name
Vin
POK
Designator
BU1
BU3
Description
Input Voltage connector
POK output connector
Info
Vin range from 2.9V to 5.0V
POK signal goes high, if the
output has reached its nominal
value
connect an external high/low
signal to enable/disable the
output, when no “J1” is set
Vout range from 5.0V to 18V
C
EN
BU2
EN input connector to
enable/disable the output
Output Voltage connector
GND connector
jumper to enable/disable
the output
D
E
F
Vout
GND
EN
BU4
BU5
J1
if no external signal is connected
to “C”, it´s possible to enable and
disable the output with this jumper
“on” → enable
“off” → disable
G
Load
J2
Load connector
connector to put a load there
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