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AS1341 - Evaluation Board
Application Note
AS1341
Evaluation Board Application Note
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AS1341 - Evaluation Board
Application Note
General Description
Board Description
Figure 1: Board Description
Connector Description
Label
Name
A
B
C
D
E
F
VIN
GND
SHDNN
OUT
GND
POK
Jumper Description
Label
Name
G
H
I
ILIM:
HIGH/LOW
ON/OFF
3.3V 5V
Measurement Points Description
Label
Name
Description
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J
K
L
M
LX
VIN
GND
OUT
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Description
Info
Input Voltage
Ground
Enable Jumper
Power Output Connector
Ground
Power-OK Signal
Input voltage ranging from 4.5V to 20V
Description
Info
Current Limiter
LOW I
LIMIT
: 0.7A
HIGH I
LIMIT
: 1.4A
ON
OFF
3.3V
Enable Jumper
5V
Info
External Conductor
Power Supply Connectors for
VIN and GND.
Power Output Connector
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AS1341 - Evaluation Board
Application Note
Operational sequence
This evaluation board comes with the AS1341.
1.
2.
3.
If not present get the
datasheet
for the
AS1341
from
www.austriamicrosystems.com.
Drive the IC on the
Demoboard only with the recommended settings and values as described in the datasheet.
Connect a 4.5V to 20V power supply (VIN
“A”
and GND
“B”).
Perform measurements at the measurement points
“J”
to
“M”.
If there are questions do not hesitate to contact us. See contact information at the end of the application note.
Optional Features
Setting the output voltage
The AS1341 has a default output voltage of 5V if FB is set to GND. Additionally the output voltage can be set
between 1.25 and V
IN
via an additionally resistor R1 & R2. The required resistor value for a certain output
voltage can be calculated as shown in equation 1.
R1=R2*(V
OUT
/V
FB
-1) (Eq1)
R1 = 360k
R2 = 220k
V
FB
= 1.25V
Predefined resistor values on board are set for 3.3V. If another voltage is required R1 and R2 can be replaced
and Jumpers “I” must be set to 3.3V.
Using the current limiter
The current limit can be set via jumper ILIM
“G”
between 700mA & 1.4A. This connects the pin ILIMIT of the
AS1341 either to GND or to V
CC
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AS1341 - Evaluation Board
Application Note
Layout of evaluation board
Board schematics and layout
Figure 3: Schematics
Figure 4: Top view
Assembly List
Label
C1
C2
L1
R1
R2
R3
D1
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Info
10µF, 25V, X7R
100µF, 10V
10µH, 85m , 1.6A
360k
220k
120
Schottky Diode
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Figure 5: Bottom view
Type
GRM32DR71E106KA12L
T520V107M010ATE018
MSS6132-103
Manufacturer
Murata
Kemet
Coilcraft
MBR120VL
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51单片机
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