1
dc2050af
DEMO MANUAL DC2050A
DESCRIPTION
LT3753
Active Clamp
Forward Converter with
Synchronous Rectification
Demonstration circuit 2050A is an active clamp forward
converter with synchronous rectification featuring the
.
This circuit was designed to demonstrate the high level
of performance, efficiency, and small solution size attain-
able using this part. It operates at 250kHz and produces
a regulated 5V, 20A output from an input voltage range
of 36V to 72V: suitable for telecom, industrial, and other
applications. It has an eighth-brick footprint area. Synchro-
nous rectification helps to attain efficiency exceeding 94%.
The DC2050 circuit features soft-start which prevents out-
put voltage overshoot during start-up or when recovering
from an overload condition.
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.
PERFORMANCE SUMMARY
The DC2050 has a precise overcurrent protection circuit
that allows for continuous operation and low power dis-
sipation during short-circuit conditions which ensures
high reliability.
Please refer to the LT3753 data sheet for design details
and applications information.
Design files for this circuit board are available at
Specifications are at T
A
= 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
36
72
V
V
OUT
Output Voltage
4.9
5.0
5.1
V
I
OUT
Output Current Range, Continuous
20
A
f
SW
Switching (Clock) Frequency
250
kHz
V
OUT(P-P)
Output Ripple
V
IN
= 48V, I
OUT
= 20A (20MHz BW)
50
mV
P-P
V
REG
Output Regulation
Line and Load (36V to 72V
IN
, 0A to 20A
OUT
)
±0.1
%
P
OUT
/P
IN
Efficiency (See Figure 2)
V
IN
= 48V, I
OUT
= 20A
94
%