Linear Technology DC1317A-B Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1317A-B
ACTIVE RESET ISOLATED 18-72V INPUT TO 5V @25A DC/DC POWER CONVERTER
DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION
Demonstration circuit 1317A-B is isolated input to
high current output 1/8th Brick footprint
featuring the LT ® 1952 switching controller with Ac-
tive Reset circuit. The Active Reset circuit can im-
prove the efficiency in wide input voltage applica-
tions. Also, the Active Reset allows the implementa-
tion of self-driven synchronous secondary rectifiers
in some applications.
The DC1317A-B converts isolated wide 18V to 72V
input to 5V output and provides over 30A of output
current depending on cooling. When determining the
cooling requirements the actual input voltage range
and continuous maximum output current must be
taken into account. The converter operates at 200kHz
with the peak efficiency greater than 94%. The
DC1317 can be easily modified to generate output
voltages in the range from 0.6V to 48V. The output
currents are limited by total output power of up to
150W.
The available versions of DC1317A are:
DC1317A-A, 34-75Vin to 3.3V, 35A
DC1317A-B, 18-72Vin to 5V, 25A
DC1317A-C, 18-72Vin to 12V, 10A
Performance Summary Performance Summary Performance Summary Performance Summary
Table 1. Table 1. Table 1. Table 1.
PARAMETER PARAMETER PARAMETER PARAMETER
Minimum Input Voltage
Maximum Input Voltage
V OUT
Typical Output Ripple V OUT
Nominal Switching Frequency
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1/8th Brick footprint converter 1/8th Brick footprint 1/8th Brick footprint
DC1317A-D, 18-72Vin to 24V, 5A
DC1317A-E, 36-72Vin to 5V, 12A
DC1317A-F, 9-36Vin to 3.3V, 20A
DC1317A-G, 9-36Vin to 12V, 5A
DC1317A-H, 9-36Vin to 48V, 1.5A
The DC1317 circuit features soft-start which prevents
output voltage overshoot on startup or when recover-
ing from overload condition.
The DC1317 has precise over-current protection cir-
cuit that allows for continuous operation under short
circuit conditions. The low power dissipation under
short circuit conditions insures high reliability even
during short circuits.
The LT1952 can be synchronized to an external clock
of up to 400kHz. Please refer to LT1952 data sheet for
design details and applications information.
Design files for this circuit board are avai i i i l l l l able. Design files for this circuit board are ava Design files for this circuit board are ava Design files for this circuit board are ava
Call the LTC factory. Call the LTC factory.
Call the LTC factory. Call the LTC factory.
LT is a trademark of Linear Technology Corporation
CONDITION CONDITION CONDITION CONDITION
I OUT = 0A to 25A
I OUT = 0A to 25A
V IN = 18V to 72V, I OUT = 0A to 25A
(30Amax)
V IN = 18V to 72V, I OUT = 0A to 25A
LT1952
able. able. able.
VALUE VALUE VALUE VALUE
18V
72V
5V ±3%
50mV P–P
200kHz
1