Linear Technology DC1817B Demo Manual

Description
Demonstration circuit 1817B is an off-line isolated flyback
converter featuring the
single constant-voltage output of 24V at 2A. It is optimized
to operate over a wide AC input voltage range (90VAC to
265VAC, 47Hz to 63Hz). Output voltage accuracy stays
within ±5% over the whole input voltage and load range. It
provides a high power factor (>0.95) enabling the design
to be used worldwide. It is also designed to comply with
the IEC 61000-3-2 Class D harmonics standard and the
EN55015B conducted EMI standard.
The LT3798 controls an isolated flyback converter in
boundary mode, suitable for applications with voltage or
current regulation. Its novel sensing scheme delivers a
performance summary
PARAMETER
Input Range
Output Voltage
Efficiency
Power Factor
Arrow.com.
Downloaded from
LT 3798. The demo board provides a
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CONDITIONS
Line Frequency, 47Hz to 63Hz
90VAC to 265VAC, 2A I
OUT
24V/2A Output, 90VAC to 265VAC
DEMO MANUAL DC1817B
Isolated No Opto-Coupler
Flyback Controller with PFC
well regulated output voltage or current to the secondary
side without the use of an opto-coupler.
The LT3798 is available in a low profile, thermally enhanced
16-lead MSOP package.
The LT3798 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1817B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1817B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C)
A
MIN TYP
90VAC 120VAC
24V
87%
0.99 0.98
LT3798
MAX
265VAC
0.95
dc1817bfa
1