Quick Setup Procedures
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3
Quick Setup Procedures
Table 1. Demonstration Board Quick Setup Procedures
Step
Description
Notes
1
Connect a power supply to VIN terminals
V
IN
range: 8V to 42V
2
Connect a load to VOUT terminals
I
OUT
range: 0A to 2.5A
3
SD (JP1) should be left open for normal operation. Short this jumper to shutdown
4
Set V
IN
= 18V, with 0A load applied, check V
OUT
with a voltmeter
Nominal 3.3V
5
Apply 2.5A load and check V
OUT
Nominal 3.3V
6
Short output terminals and check the short circuit current with an ammeter
Nominal 2.95A
7
Short SD (JP1) to check the shutdown function
4
Performance Characteristics
Table 2. Demonstration Board Performance Characteristics
Description
Symbol
Condition
Min
Typ
Max
Unit
Input Voltage
V
IN
8
18
42
V
Output Voltage
V
OUT
3.2
3.3
3.4
V
Output Current
I
OUT
0
-
2.5
A
Output Voltage Ripple
V
OUT
(Ripple)
-
-
50
mVp-p
Output Voltage Regulation
Δ
V
OUT
ALL V
IN
and I
OUT
Conditions
-3
3
%
Efficiency
V
IN
= 8V
84
92
%
V
IN
= 24V
73
85
V
IN
= 42V
62
79
(I
OUT
= 0.1A to 2.5A)
Output Short Current Limit
I
LIM-SC
2.95
A
5
Design Procedure
The LM3102 is easy to use compared with other devices available on the market because it integrates all
key components, including both the main and synchronous power MOSFETs, in a single package and
requires no loop compensation owing to the use of the Constant On-Time (COT) hysteretic control
scheme. The design of the demonstration board is detailed below.
Design Parameters:
V
IN
= 8V to 42V, typical 18V
V
OUT
= 3.3V
I
OUT
= 2.5A
2
AN-1646 LM3102 Demonstration Board Reference Design
SNVA248 – October 2007
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