Linear Technology DC2050A Manual

DESCRIPTION
Demonstration circuit 2050A is an active clamp forward
converter with synchronous rectification featuring the
LT 3753.
®
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.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Supply Range
IN
V Output Voltage
OUT
I Output Current Range, Continuous
OUT
f Switching (Clock) Frequency
SW
V Output Ripple
OUT(P-P)
V Output Regulation
REG
P /P Efficiency (See Figure 2)
OUT IN
DEMO MANUAL DC2050A
Forward Converter with
Synchronous Rectification
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
http://www.linear.com/demo
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.
Specifications are at T
A
CONDITIONS
V = 48V, I = 20A (20MHz BW)
IN OUT
Line and Load (36V to 72V , 0A to 20A
IN
V = 48V, I = 20A
IN OUT
Active Clamp
= 25°C
MIN TYP
36
4.9 5.0
20
250
50
) ±0.1
OUT
94
LT3753
MAX UNITS
72 V
5.1 V
A
kHz
mV
P-P
%
%
dc2050af
1