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dc1739bcf
DEMO MANUAL DC1739B-C
DESCRIPTION
LTC3765/LTC3766
120W Isolated Forward Converter
with Synchronous Rectification
Demonstration circuit 1739B-C is a 120W isolated forward
converter with synchronous rectification featuring the
LTC
®
3765/LTC3766
chip set.
This circuit was designed to demonstrate the high level of
performance, efficiency, and small solution size attainable
using this chip set in an active-clamp-reset forward con-
verter power supply. It operates at 240kHz and produces
a regulated 12V, 10A output from an input voltage range
of 9V to 36V: suitable for telecom, industrial, and other
applications. It has an eighth-brick footprint area. Synchro-
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.
nous rectification helps to attain efficiency exceeding 94%.
Secondary-side control eliminates complex opto-coupler
feedback, providing fast transient response with minimum
output capacitance. For other output requirements, see the
LTC3766 data sheet or contact the LTC factory.
Design files for this circuit board are available at
http://www.linear.com/demo
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Supply Range
9
36
V
V
OUT
Output Voltage
12.0
V
I
OUT
Output Current Range, Continuous
200LFM
0
10
A
f
SW
Switching (Clock) Frequency
240
kHz
V
OUT(P-P)
Output Ripple
V
IN
= 24V, I
OUT
= 10A (20MHz BW)
40
mV
P–P
I
REG
Output Regulation
Line and Load (9V
IN
to 36V
IN
, 0A
OUT
to 10A
OUT
)
±0.27
%
P
OUT
/P
IN
Efficiency (See Figure 3)
V
IN
= 24V, I
OUT
= 10A
92.7
%
Isolation
Basic
1500
VDC
Approximate Size
Component Area
×
Top Component Height
2.3
×
0.9
×
0.47
Inches
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