Performance Summary - Linear Technology DC1929A Demo Manual

Description
Demonstration circuit 1929A is a 200W active clamp for-
ward converter featuring the
It operates at about 100kHz and produces a regulated 12V
output from an input voltage ranging from 150V to 400V,
making it well suited for automotive, industrial, and other
applications. Table 1 summarizes the performance of the
demo board.
The LT3752-1 is a current mode PWM controller opti-
mized for a forward converter with high-side active clamp
transformer reset. An accurate, programmable volt-second
clamp allows primary switch duty cycles above 50% for
better utilization of switch, transformer and rectifier. The
AOUT control signal can be used to power a gate drive
transformer, level-shift driver, or opto-coupler driver
for the high-side N-channel FET. The SOUT controls the
secondary side synchronous rectification. The integrated
housekeeping flyback controller brings great convenience
for both primary and secondary bias circuits. During its
soft-start and soft-stop, LT3752-1 folds back switching

performance summary

PARAMETER
Input Voltage Range (V )
IN
Startup Voltage
UVLO Shutdown Voltage
OVLO Shutdown Voltage
Output Voltage (V )
OUT
Rated Output Current Continuous (I
Short-term Output Current (I )
MAX
Switching Frequency (f )
SW
Output Voltage Ripple (Peak_to_Peak)
No Load Current
Efficiency
Isolation (Primary and Secondary)
Converter with Input Voltage 150V to 400V
LT 3752-1/LT8311 chipset.
®
Specifications are at T
CONDITIONS
V
IN
) 300LFM
OUT
300LFM, 1 Minute
I
OUT
V
IN
DEMO MANUAL DC1929A
200W Active Clamp Forward
frequency and duty-ratio clamp, thus reduces the electri-
cal stresses over the output inductor, and transformer.
The LT3752-1 features a set of safety protections including
undervoltage, overvoltage and overcurrent protections. Its
precise overcurrent protection allows for continuous reli-
able operation under short-circuit conditions. The LT8311
controls the secondary side synchronous rectification, with
enhanced regulation of the output voltage during startup,
shutdown or recovery from a fault.
The LT3752-1 and LT8311 data sheets give complete
descriptions of the parts, operation and application infor-
mation. The data sheet must be read in conjunction with
this quick start guide for Demo Circuit 1929A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1929A
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
= 150V to 400V
= 0A, V = 400V
IN
= 250V, I = 16.7A, 300LFM
OUT
LT3752-1/LT8311
MIN TYP MAX
150 250 400
150
147
416
11.76 12 12.24
16.7
20
100
120
18
93.9
1500
UNITS
V
V
V
V
V
A
A
kHz
mV
P-P
mA
%
V
dc1929afa
1