1
dc1987af
DEMO MANUAL DC1987A
Description
LTM8057
Isolated μModule DC/DC Converter
The Demo circuit 1987A is a 2kV AC isolated flyback
μModule
®
DC/DC converter featuring the
LTM8057
. The
demo circuit is designed for a 5V flyback output from a
4.5V to 29V input. The typical current capability of the 5V
flyback output varies with input voltage from about 110mA
at 4.5V
IN
to about 350mA at 29V
IN
. Figure 1 shows the
typical maximum output current on V
OUT
. R1 provides
the necessary minimum load current to keep the V
OUT
in regulation throughout the entire input voltage range.
Please see the typical performance characteristic curves
L
, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
in the LTM8057 data sheet to determine the minimum load
current for other input/output configurations.
The LTM8057 data sheet gives complete description of
the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide prior to using demo circuit 1987A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1987A
Figure 1. V
OUT
Typical Maximum Output Current vs V
IN
Figure 2. V
OUT
Output Noise Spectrum with I
OUT
at 100mA and V
IN
at 12V
V
IN
(V)
4
OUTPUT CURRENT (mA)
400
50
300
200
350
250
0
150
100
10
18
14
22 24
dc1987 F01
30
6
16
12
20
28
8
26
FREQUENCY (MHz)
0
INTENSIT
Y (dBm)
0
–80
–20
–40
–120
–60
–100
1.0
3.0
2.0
4.0
dc1987 F02
5.0
0.5
2.5
1.5
3.5
4.5
BoarD photo
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