Linear Technology DC2015A Demo Manual

DESCRIPTION
Demonstration circuit 2015A is a resonant reset forward
converter with synchronous rectification featuring the
LT 8310/LT8311 chipset.
®
This circuit was designed to demonstrate the high levels of
performance, efficiency, and small solution size attainable
using these parts. It operates at 240kHz and produces a
regulated 12V, 12A 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 DC2015A circuit features soft-start which prevents
output voltage overshoot on startup or when recovering
from overload condition.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Supply Range
IN
V Output Voltage
OUT
I Maximum Output Current, Continuous
OUT
f Switching (Clock) Frequency
SW
V Output Ripple
OUT(P-P)
I Output Regulation
REG
P /P Efficiency (See Figure 3)
OUT IN
Isolation
DEMO MANUAL DC2015A
Forward Converter with
Synchronous Rectification
The DC2015A takes advantage of the LT8310's input
undervoltage and overvoltage protection to shutdown the
system when the input voltage is outside of the set limits.
The DC2015A also has precise overcurrent protection
that allows for continuous operation under short-circuit
conditions. The low power dissipation under a short-circuit
condition insures high reliability even during a prolonged
output voltage short-circuit.
The LT8310/LT8311 data sheets give a complete descrip-
tion of the parts, operation and application information.
The data sheets must be read in conjunction with this
quick start guide for demo circuit 2015A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2015A
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 = 25°C
A
CONDITIONS
200LFM Airflow
V = 48V, I = 12A (20MHz BW)
IN OUT
Line and Load (36V to 72V , 0A
IN IN
V = 48V, I = 12A
IN OUT
Basic
LT8310/LT8311
48V to 12V/12A
IN
MIN TYP
36
11.7 12.0
12
240
80
to 12A ) ±0.1
OUT OUT
94
1500
MAX UNITS
72 V
12.3 V
A
kHz
mV
P-P
%
%
VDC
dc2015af
1