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DC1865A

Description
eval board ldo reg lt3055
CategoryDevelopment board/suite/development tools   
File Size250KB,6 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1865A Overview

eval board ldo reg lt3055

DEMO MANUAL DC1865A
LT3055
500mA, Linear Regulator with
Precision Current Limit and Diagnostics
Description
Demonstration circuit 1865A is an adjustable 500mA linear
regulator featuring
LT
®
3055.
LT3055 is a micropower, low
noise and low dropout voltage linear regulator. The device
supplies 500mA of output current with a dropout voltage
of 350mV. A 10nF bypass capacitor reduces output noise
to 25µV
RMS
in a 10Hz to 100kHz bandwidth and soft-starts
the reference. The LT3055’s ±45V input voltage rating
combined with its precision current limit and diagnostic
functions make the IC an ideal choice for robust, high
reliability applications.
LT3055 current limit can be programmed by a single
resistor, accurate to ±10% over a wide input voltage
and temperature range. Another resistor programs the
LT3055’s minimum output current monitor, useful for
detecting open-circuit conditions. The internal current limit
should be considered when the input-to-output differential
is high. The current monitor function sources a current
equal to 1/500th of output current. See the Operation sec-
tion in the data sheet for a detailed calculation. Logic fault
pins assert low if the LT3055 is in current limit (FAULT2),
operating below its minimum output current (FAULT1)
or is in thermal limit (both
FAULT1
and
FAULT2).
The die
temperature is indicated by the TEMP pin.
LT3055 optimizes stability and transient response with a
low ESR ceramic capacitor, requiring a minimum of 3.3µF.
The LT3055 is available in the thermally-enhanced 16-lead
4mm × 3mm DFN and MSOP packages.
The LT3055 data sheet gives a complete description of
the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide for DC1865.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1865A
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.
performance summary
PARAMETER
Minimum Input Voltage (Max)
Maximum Input Voltage
Output Voltage V
OUT
V
OUT
= 5V
Specifications are at T
A
= 25°C
VALUE
5.6V
45V
1.20V ±3%
1.50V ±3%
1.80V ±3%
2.50V ±3%
3.32V ±3%
4.99V ±3%
500mA
10mA
1V
0.25V
CONDITIONS
V
OUT
= 5V, I
OUT
= 500mA
Header in JP1
Header in JP2
Header in JP3
Header in JP4
Header in JP5
Header in JP6
V
IN
= 12V, V
OUT
= 5V, R10 = 604Ω
V
IN
= 12V, V
OUT
= 5V, R9 = 121kΩ
V
IN
= 12V, V
OUT
= 5V, R8 = 1k, I
OUT
= 500mA
V
IN
= 12V, V
OUT
= 5V
Maximum Output Current (Typ)
Minimum Output Current (Typ)
I
MON
Voltage (to µP ADC) (Typ)
Temp voltage (Typ)
dc1865af
1

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