Linear Technology DC1987A Demo Manual

Description
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 to about 350mA at 29V
IN
typical maximum output current on V
the necessary minimum load current to keep the V
in regulation throughout the entire input voltage range.
Please see the typical performance characteristic curves
400
350
300
250
200
150
100
50
0
4 6 8 10 12 14
Figure 1. V Typical Maximum Output Current vs V
OUT
BoarD photo
All manuals and user guides at all-guides.com
Isolated μModule DC/DC Converter
. Figure 1 shows the
IN
. R1 provides
OUT
16 18 20 22 24 26 28 30
V (V)
IN
dc1987 F01
IN
DEMO MANUAL DC1987A
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
OUT
http://www.linear.com/demo/DC1987A
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.
0
–20
–40
–60
–80
–100
–120
0 0.5
Figure 2. V
OUT
at 100mA and V
LTM8057
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
FREQUENCY (MHz)
dc1987 F02
Output Noise Spectrum with I
at 12V
IN
OUT
dc1987af
1